def dynamic_ellipse(self, x, y, sx, sy):
points_in_curve = 360
x1, y1 = difference(sx, sy, x, y)
x1, y1, sin, cos = starting_point_for_ellipse(x1, y1, self.angle)
rx, ry = point_in_ellipse(x1, y1, sin, cos, 0)
self.brush_prep(sx + rx, sy + ry)
entry_p, midpoint_p, prange1, prange2, h, t = self.line_settings()
head = points_in_curve * h
head_range = int(head) + 1
tail = points_in_curve * t
tail_range = int(tail) + 1
tail_length = points_in_curve - tail
# Beginning
px, py = point_in_ellipse(x1, y1, sin, cos, 1)
length, nx, ny = length_and_normal(rx, ry, px, py)
mx, my = multiply_add(rx, ry, nx, ny, 0.25)
self._stroke_to(sx + mx, sy + my, entry_p)
pressure = abs(1 / head * prange1 + entry_p)
self._stroke_to(sx + px, sy + py, pressure)
for degree in xrange(2, head_range):
px, py = point_in_ellipse(x1, y1, sin, cos, degree)
pressure = abs(degree / head * prange1 + entry_p)
self._stroke_to(sx + px, sy + py, pressure)
# Middle
for degree in xrange(head_range, tail_range):
px, py = point_in_ellipse(x1, y1, sin, cos, degree)
self._stroke_to(sx + px, sy + py, midpoint_p)
# End
for degree in xrange(tail_range, points_in_curve + 1):
px, py = point_in_ellipse(x1, y1, sin, cos, degree)
pressure = abs((degree - tail) / tail_length * prange2 +
midpoint_p)
self._stroke_to(sx + px, sy + py, pressure)
def draw_curve_1(self, cx, cy, sx, sy, ex, ey):
points_in_curve = 100
entry_p, midpoint_p, prange1, prange2, h, t = self.line_settings()
mx, my = midpoint(sx, sy, ex, ey)
length, nx, ny = length_and_normal(mx, my, cx, cy)
cx, cy = multiply_add(mx, my, nx, ny, length * 2)
x1, y1 = difference(sx, sy, cx, cy)
x2, y2 = difference(cx, cy, ex, ey)
head = points_in_curve * h
head_range = int(head) + 1
tail = points_in_curve * t
tail_range = int(tail) + 1
tail_length = points_in_curve - tail
# Beginning
px, py = point_on_curve_1(1, cx, cy, sx, sy, x1, y1, x2, y2)
length, nx, ny = length_and_normal(sx, sy, px, py)
bx, by = multiply_add(sx, sy, nx, ny, 0.25)
self._stroke_to(bx, by, entry_p)
pressure = abs(1 / head * prange1 + entry_p)
self._stroke_to(px, py, pressure)
for i in xrange(2, head_range):
px, py = point_on_curve_1(i, cx, cy, sx, sy, x1, y1, x2, y2)
pressure = abs(i / head * prange1 + entry_p)
self._stroke_to(px, py, pressure)
# Middle
for i in xrange(head_range, tail_range):
px, py = point_on_curve_1(i, cx, cy, sx, sy, x1, y1, x2, y2)
self._stroke_to(px, py, midpoint_p)
# End
for i in xrange(tail_range, points_in_curve + 1):
px, py = point_on_curve_1(i, cx, cy, sx, sy, x1, y1, x2, y2)
pressure = abs((i - tail) / tail_length * prange2 + midpoint_p)
self._stroke_to(px, py, pressure)
def new_from_pixbuf_average(class_, pixbuf):
"""Returns the the average of all colors in a pixbuf."""
assert pixbuf.get_colorspace() == GdkPixbuf.Colorspace.RGB
assert pixbuf.get_bits_per_sample() == 8
n_channels = pixbuf.get_n_channels()
assert n_channels in (3, 4)
if n_channels == 3:
assert not pixbuf.get_has_alpha()
else:
assert pixbuf.get_has_alpha()
data = pixbuf.get_pixels()
w, h = pixbuf.get_width(), pixbuf.get_height()
rowstride = pixbuf.get_rowstride()
n_pixels = w * h
r = g = b = 0
for y in xrange(h):
for x in xrange(w):
offs = y * rowstride + x * n_channels
r += ord(data[offs])
g += ord(data[offs + 1])
b += ord(data[offs + 2])
r = r / n_pixels
g = g / n_pixels
b = b / n_pixels
return RGBColor(r / 255, g / 255, b / 255)
def dynamic_ellipse(self, x, y, sx, sy):
points_in_curve = 360
x1, y1 = difference(sx, sy, x, y)
x1, y1, sin, cos = starting_point_for_ellipse(x1, y1, self.angle)
rx, ry = point_in_ellipse(x1, y1, sin, cos, 0)
self.brush_prep(sx+rx, sy+ry)
entry_p, midpoint_p, prange1, prange2, h, t = self.line_settings()
head = points_in_curve * h
head_range = int(head)+1
tail = points_in_curve * t
tail_range = int(tail)+1
tail_length = points_in_curve - tail
# Beginning
px, py = point_in_ellipse(x1, y1, sin, cos, 1)
length, nx, ny = length_and_normal(rx, ry, px, py)
mx, my = multiply_add(rx, ry, nx, ny, 0.25)
self._stroke_to(sx+mx, sy+my, entry_p)
pressure = abs(1/head * prange1 + entry_p)
self._stroke_to(sx+px, sy+py, pressure)
for degree in xrange(2, head_range):
px, py = point_in_ellipse(x1, y1, sin, cos, degree)
pressure = abs(degree/head * prange1 + entry_p)
self._stroke_to(sx+px, sy+py, pressure)
# Middle
for degree in xrange(head_range, tail_range):
px, py = point_in_ellipse(x1, y1, sin, cos, degree)
self._stroke_to(sx+px, sy+py, midpoint_p)
# End
for degree in xrange(tail_range, points_in_curve+1):
px, py = point_in_ellipse(x1, y1, sin, cos, degree)
pressure = abs((degree-tail)/tail_length * prange2 + midpoint_p)
self._stroke_to(sx+px, sy+py, pressure)
def draw_curve_1(self, cx, cy, sx, sy, ex, ey):
points_in_curve = 100
entry_p, midpoint_p, prange1, prange2, h, t = self.line_settings()
mx, my = midpoint(sx, sy, ex, ey)
length, nx, ny = length_and_normal(mx, my, cx, cy)
cx, cy = multiply_add(mx, my, nx, ny, length*2)
x1, y1 = difference(sx, sy, cx, cy)
x2, y2 = difference(cx, cy, ex, ey)
head = points_in_curve * h
head_range = int(head)+1
tail = points_in_curve * t
tail_range = int(tail)+1
tail_length = points_in_curve - tail
# Beginning
px, py = point_on_curve_1(1, cx, cy, sx, sy, x1, y1, x2, y2)
length, nx, ny = length_and_normal(sx, sy, px, py)
bx, by = multiply_add(sx, sy, nx, ny, 0.25)
self._stroke_to(bx, by, entry_p)
pressure = abs(1/head * prange1 + entry_p)
self._stroke_to(px, py, pressure)
for i in xrange(2, head_range):
px, py = point_on_curve_1(i, cx, cy, sx, sy, x1, y1, x2, y2)
pressure = abs(i/head * prange1 + entry_p)
self._stroke_to(px, py, pressure)
# Middle
for i in xrange(head_range, tail_range):
px, py = point_on_curve_1(i, cx, cy, sx, sy, x1, y1, x2, y2)
self._stroke_to(px, py, midpoint_p)
# End
for i in xrange(tail_range, points_in_curve+1):
px, py = point_on_curve_1(i, cx, cy, sx, sy, x1, y1, x2, y2)
pressure = abs((i-tail)/tail_length * prange2 + midpoint_p)
self._stroke_to(px, py, pressure)
def test_all_modes_correctness(self):
"""Test that all modes work the way they advertise"""
# Test each mode in turn
for mode in xrange(mypaintlib.NumCombineModes):
mode_info = mypaintlib.combine_mode_get_info(mode)
mode_name = mode_info["name"]
src = self.src
dst = np.empty((N, N, 4), dtype='uint16')
dst[...] = self.dst_orig[...]
# Combine using the current mode
mypaintlib.tile_combine(mode, src, dst, True, 1.0)
# Tests
zero_alpha_has_effect = False
zero_alpha_clears_backdrop = True # means: "*always* clears b."
can_decrease_alpha = False
for i in xrange(len(self.sample_data)):
for j in xrange(len(self.sample_data)):
old = tuple(self.dst_orig[i, j])
new = tuple(dst[i, j])
if src[i][j][3] == 0:
if new[3] != 0 and old[3] != 0:
zero_alpha_clears_backdrop = False
if old != new:
zero_alpha_has_effect = True
if (not can_decrease_alpha) and (new[3] < old[3]):
can_decrease_alpha = True
self.assertFalse(
(new[0] > new[3] or new[1] > new[3]
or new[2] > new[3]),
msg="%s isn't writing premultiplied data properly" %
(mode_name, ),
)
self.assertFalse(
(new[0] > FIX15_ONE or new[1] > FIX15_ONE
or new[2] > FIX15_ONE or new[3] > FIX15_ONE),
msg="%s isn't writing fix15 data properly" %
(mode_name, ),
)
flag_test_results = [
("zero_alpha_has_effect", zero_alpha_has_effect),
("zero_alpha_clears_backdrop", zero_alpha_clears_backdrop),
("can_decrease_alpha", can_decrease_alpha),
]
for info_str, tested_value in flag_test_results:
current_value = bool(mode_info[info_str])
self.assertEqual(
current_value,
tested_value,
msg="%s's %r is wrong: should be %r, not %r" %
(mode_name, info_str, tested_value, current_value),
)
self.assertTrue(
mode in MODE_STRINGS,
msg="%s needs localizable UI strings" % (mode_name, ),
)
def _tile_pixbuf(pixbuf, repeats_x, repeats_y):
"""Make a repeated tiled image of a pixbuf"""
w, h = pixbuf.get_width(), pixbuf.get_height()
result = new_blank_pixbuf((0, 0, 0), repeats_x * w, repeats_y * h)
for xi in xrange(repeats_x):
for yi in xrange(repeats_y):
pixbuf.copy_area(0, 0, w, h, result, w * xi, h * yi)
return result
def _tile_pixbuf(pixbuf, repeats_x, repeats_y):
"""Make a repeated tiled image of a pixbuf"""
w, h = pixbuf.get_width(), pixbuf.get_height()
result = new_blank_pixbuf((0, 0, 0), repeats_x * w, repeats_y * h)
for xi in xrange(repeats_x):
for yi in xrange(repeats_y):
pixbuf.copy_area(0, 0, w, h, result, w * xi, h * yi)
return result
def draw_cb(self, widget, cr):
# Paint the base color, and the list's pixbuf.
state_flags = widget.get_state_flags()
style_context = widget.get_style_context()
style_context.save()
bg_color_gdk = style_context.get_background_color(state_flags)
bg_color = uicolor.from_gdk_rgba(bg_color_gdk)
cr.set_source_rgb(*bg_color.get_rgb())
cr.paint()
Gdk.cairo_set_source_pixbuf(cr, self.pixbuf, 0, 0)
cr.paint()
# border colors
gdkrgba = style_context.get_background_color(state_flags
| Gtk.StateFlags.SELECTED)
selected_color = uicolor.from_gdk_rgba(gdkrgba)
gdkrgba = style_context.get_background_color(state_flags
| Gtk.StateFlags.NORMAL)
insertion_color = uicolor.from_gdk_rgba(gdkrgba)
style_context.restore()
# Draw borders
last_i = len(self.itemlist) - 1
for i, b in enumerate(self.itemlist):
rect_color = None
if b is self.selected:
rect_color = selected_color
elif self.drag_insertion_index is not None:
if i == self.drag_insertion_index \
or (i == last_i and self.drag_insertion_index > i):
rect_color = insertion_color
if rect_color is None:
continue
x = (i % self.tiles_w) * self.total_w
y = (i // self.tiles_w) * self.total_h
w = self.total_w
h = self.total_h
def shrink(pixels, x, y, w, h):
x += pixels
y += pixels
w -= 2 * pixels
h -= 2 * pixels
return (x, y, w, h)
x, y, w, h = shrink(self.spacing_outside, x, y, w, h)
for j in xrange(self.border_visible_outside_cell):
x, y, w, h = shrink(-1, x, y, w, h)
max_j = self.border_visible + self.border_visible_outside_cell
for j in xrange(max_j):
cr.set_source_rgb(*rect_color.get_rgb())
cr.rectangle(x, y, w - 1,
h - 1) # FIXME: check pixel alignment
cr.stroke()
x, y, w, h = shrink(1, x, y, w, h)
return True
def render_checks(cr, size, nchecks):
"""Render a checquerboard pattern to a cairo surface"""
cr.set_source_rgb(*gui.style.ALPHA_CHECK_COLOR_1)
cr.paint()
cr.set_source_rgb(*gui.style.ALPHA_CHECK_COLOR_2)
for i in xrange(0, nchecks):
for j in xrange(0, nchecks):
if (i + j) % 2 == 0:
continue
cr.rectangle(i * size, j * size, size, size)
cr.fill()
def render_checks(cr, size, nchecks):
"""Render a checquerboard pattern to a cairo surface"""
cr.set_source_rgb(*gui.style.ALPHA_CHECK_COLOR_1)
cr.paint()
cr.set_source_rgb(*gui.style.ALPHA_CHECK_COLOR_2)
for i in xrange(0, nchecks):
for j in xrange(0, nchecks):
if (i+j) % 2 == 0:
continue
cr.rectangle(i*size, j*size, size, size)
cr.fill()
def _init_groups(self):
"""Initialize brush groups, loading them from disk."""
self.contexts = [None for i in xrange(_NUM_BRUSHKEYS)]
self.history = [None for i in xrange(_BRUSH_HISTORY_SIZE)]
brush_cache = {}
self._init_ordered_groups(brush_cache)
self._init_unordered_groups(brush_cache)
self._init_default_brushkeys_and_history()
# clean up legacy stuff
fn = os.path.join(self.user_brushpath, 'deleted.conf')
if os.path.exists(fn):
os.remove(fn)
def set_mask_from_palette(self, pal):
"""Sets the mask from a palette.
Any `palette.Palette` can be loaded into the wheel widget, and color
names are used for distinguishing mask shapes. If a color name
matches the pattern "``mask #<decimal-int>``", it will be associated
with the shape having the ID ``<decimal-int>``.
"""
if pal is None:
return
mask_id_re = re.compile(r'\bmask\s*#?\s*(\d+)\b')
mask_shapes = {}
for i in xrange(len(pal)):
color = pal.get_color(i)
if color is None:
continue
shape_id = 0
color_name = pal.get_color_name(i)
if color_name is not None:
mask_id_match = mask_id_re.search(color_name)
if mask_id_match:
shape_id = int(mask_id_match.group(1))
if shape_id not in mask_shapes:
mask_shapes[shape_id] = []
mask_shapes[shape_id].append(color)
mask_list = []
shape_ids = sorted(mask_shapes.keys())
for shape_id in shape_ids:
mask_list.append(mask_shapes[shape_id])
self.set_mask(mask_list)
def _draw_curve_segment(self, model, p_1, p0, p1, p2, state):
"""Draw the curve segment between the middle two points"""
last_t_abs = state["t_abs"]
dtime_p0_p1_real = p1[-1] - p0[-1]
steps_t = dtime_p0_p1_real / self.INTERPOLATION_MAX_SLICE_TIME
dist_p1_p2 = math.hypot(p1[0] - p2[0], p1[1] - p2[1])
steps_d = dist_p1_p2 / self.INTERPOLATION_MAX_SLICE_DISTANCE
steps = math.ceil(min(self.INTERPOLATION_MAX_SLICES,
max(2, steps_t, steps_d)))
for i in xrange(int(steps) + 1):
t = i / steps
point = gui.drawutils.spline_4p(t, p_1, p0, p1, p2)
x, y, pressure, xtilt, ytilt, t_abs, viewzoom, viewrotation, barrel_rotation = point
pressure = lib.helpers.clamp(pressure, 0.0, 1.0)
xtilt = lib.helpers.clamp(xtilt, -1.0, 1.0)
ytilt = lib.helpers.clamp(ytilt, -1.0, 1.0)
t_abs = max(last_t_abs, t_abs)
dtime = t_abs - last_t_abs
viewzoom = self.doc.tdw.scale
viewrotation = self.doc.tdw.rotation
barrel_rotation = 0.0
self.stroke_to(
model, dtime, x, y, pressure, xtilt, ytilt, viewzoom, viewrotation, barrel_rotation,
auto_split=False,
)
last_t_abs = t_abs
state["t_abs"] = last_t_abs
def _draw_curve_segment(self, model, p_1, p0, p1, p2, state):
"""Draw the curve segment between the middle two points"""
last_t_abs = state["t_abs"]
dtime_p0_p1_real = p1[-1] - p0[-1]
steps_t = dtime_p0_p1_real / self.INTERPOLATION_MAX_SLICE_TIME
dist_p1_p2 = math.hypot(p1[0] - p2[0], p1[1] - p2[1])
steps_d = dist_p1_p2 / self.INTERPOLATION_MAX_SLICE_DISTANCE
steps = math.ceil(
min(self.INTERPOLATION_MAX_SLICES, max(2, steps_t, steps_d)))
for i in xrange(int(steps) + 1):
t = i / steps
point = gui.drawutils.spline_4p(t, p_1, p0, p1, p2)
x, y, pressure, xtilt, ytilt, t_abs, viewzoom, viewrotation = point
pressure = lib.helpers.clamp(pressure, 0.0, 1.0)
xtilt = lib.helpers.clamp(xtilt, -1.0, 1.0)
ytilt = lib.helpers.clamp(ytilt, -1.0, 1.0)
t_abs = max(last_t_abs, t_abs)
dtime = t_abs - last_t_abs
viewzoom = self.doc.tdw.scale
viewrotation = self.doc.tdw.rotation
self.stroke_to(
model,
dtime,
x,
y,
pressure,
xtilt,
ytilt,
viewzoom,
viewrotation,
auto_split=False,
)
last_t_abs = t_abs
state["t_abs"] = last_t_abs
def append(self, col, name=None, unique=False, match=False):
"""Appends a color, optionally setting a name for it.
:param col: The color to append.
:param name: Name of the color to insert.
:param unique: If true, don't append if the color already exists
in the palette. Only exact matches count.
:param match: If true, set the match position to the
appropriate palette entry.
"""
col = self._copy_color_in(col, name)
if unique:
# Find the final exact match, if one is present
for i in xrange(len(self._colors)-1, -1, -1):
if col == self._colors[i]:
if match:
self._match_position = i
self._match_is_approx = False
self.match_changed()
return
# Append new color, and select it if requested
end_i = len(self._colors)
self._colors.append(col)
if match:
self._match_position = end_i
self._match_is_approx = False
self.match_changed()
self.sequence_changed()
def set_mask_from_palette(self, pal):
"""Sets the mask from a palette.
Any `palette.Palette` can be loaded into the wheel widget, and color
names are used for distinguishing mask shapes. If a color name
matches the pattern "``mask #<decimal-int>``", it will be associated
with the shape having the ID ``<decimal-int>``.
"""
if pal is None:
return
mask_id_re = re.compile(r'\bmask\s*#?\s*(\d+)\b')
mask_shapes = {}
for i in xrange(len(pal)):
color = pal.get_color(i)
if color is None:
continue
shape_id = 0
color_name = pal.get_color_name(i)
if color_name is not None:
mask_id_match = mask_id_re.search(color_name)
if mask_id_match:
shape_id = int(mask_id_match.group(1))
if shape_id not in mask_shapes:
mask_shapes[shape_id] = []
mask_shapes[shape_id].append(color)
mask_list = []
shape_ids = sorted(mask_shapes.keys())
for shape_id in shape_ids:
mask_list.append(mask_shapes[shape_id])
self.set_mask(mask_list)
def __add_void(self, x, y):
# Adds a new shape into the empty space centred at `x`, `y`.
self.queue_draw()
# Pick a nice size for the new shape, taking care not to
# overlap any other shapes, at least initially.
alloc = self.get_allocation()
cx, cy = self.get_center(alloc=alloc)
radius = self.get_radius(alloc=alloc)
dx, dy = x - cx, y - cy
r = math.sqrt(dx**2 + dy**2)
d = self.__dist_to_nearest_shape(x, y)
if d is None:
d = radius
size = min((radius - r), d) * 0.95
minsize = radius * self.min_shape_size
if size < minsize:
return
# Create a regular polygon with one of its edges facing the
# middle of the wheel.
shape = []
nsides = 3 + len(self.get_mask())
psi = math.atan2(dy, dx) + (math.pi / nsides)
psi += math.pi
for i in xrange(nsides):
theta = 2.0 * math.pi * i / nsides
theta += psi
px = int(x + size * math.cos(theta))
py = int(y + size * math.sin(theta))
col = self.get_color_at_position(px, py, ignore_mask=True)
shape.append(col)
mask = self.get_mask()
mask.append(shape)
self.set_mask(mask)
def interpolate(self, other, steps):
"""YCbCr interpolation.
>>> yellow = YCbCrColor(color=RGBColor(1,1,0))
>>> red = YCbCrColor(color=RGBColor(1,0,0))
>>> [c.to_hex_str() for c in yellow.interpolate(red, 3)]
['#feff00', '#ff7f00', '#ff0000']
This colorspace is a simple transformation of the RGB cube, so to
within a small margin of error, the results of this interpolation are
identical to an interpolation in RGB space.
>>> y_rgb = RGBColor(1,1,0)
>>> r_rgb = RGBColor(1,0,0)
>>> [c.to_hex_str() for c in y_rgb.interpolate(r_rgb, 3)]
['#ffff00', '#ff7f00', '#ff0000']
"""
assert steps >= 3
other = YCbCrColor(color=other)
# Like HSV, interpolate using the shortest angular distance.
for step in xrange(steps):
p = step / (steps - 1)
Y = self.Y + (other.Y - self.Y) * p
Cb = self.Cb + (other.Cb - self.Cb) * p
Cr = self.Cr + (other.Cr - self.Cr) * p
yield YCbCrColor(Y=Y, Cb=Cb, Cr=Cr)
def append(self, col, name=None, unique=False, match=False):
"""Appends a color, optionally setting a name for it.
:param col: The color to append.
:param name: Name of the color to insert.
:param unique: If true, don't append if the color already exists
in the palette. Only exact matches count.
:param match: If true, set the match position to the
appropriate palette entry.
"""
col = self._copy_color_in(col, name)
if unique:
# Find the final exact match, if one is present
for i in xrange(len(self._colors)-1, -1, -1):
if col == self._colors[i]:
if match:
self._match_position = i
self._match_is_approx = False
self.match_changed()
return
# Append new color, and select it if requested
end_i = len(self._colors)
self._colors.append(col)
if match:
self._match_position = end_i
self._match_is_approx = False
self.match_changed()
self.sequence_changed()
def interpolate(self, other, steps):
"""YCbCr interpolation.
>>> yellow = YCbCrColor(color=RGBColor(1,1,0))
>>> red = YCbCrColor(color=RGBColor(1,0,0))
>>> [c.to_hex_str() for c in yellow.interpolate(red, 3)]
['#feff00', '#ff7f00', '#ff0000']
This colorspace is a simple transformation of the RGB cube, so to
within a small margin of error, the results of this interpolation are
identical to an interpolation in RGB space.
>>> y_rgb = RGBColor(1,1,0)
>>> r_rgb = RGBColor(1,0,0)
>>> [c.to_hex_str() for c in y_rgb.interpolate(r_rgb, 3)]
['#ffff00', '#ff7f00', '#ff0000']
"""
assert steps >= 3
other = YCbCrColor(color=other)
# Like HSV, interpolate using the shortest angular distance.
for step in xrange(steps):
p = step / (steps - 1)
Y = self.Y + (other.Y - self.Y) * p
Cb = self.Cb + (other.Cb - self.Cb) * p
Cr = self.Cr + (other.Cr - self.Cr) * p
yield YCbCrColor(Y=Y, Cb=Cb, Cr=Cr)
def __add_void(self, x, y):
# Adds a new shape into the empty space centred at `x`, `y`.
self.queue_draw()
# Pick a nice size for the new shape, taking care not to
# overlap any other shapes, at least initially.
alloc = self.get_allocation()
cx, cy = self.get_center(alloc=alloc)
radius = self.get_radius(alloc=alloc)
dx, dy = x-cx, y-cy
r = math.sqrt(dx**2 + dy**2)
d = self.__dist_to_nearest_shape(x, y)
if d is None:
d = radius
size = min((radius - r), d) * 0.95
minsize = radius * self.min_shape_size
if size < minsize:
return
# Create a regular polygon with one of its edges facing the
# middle of the wheel.
shape = []
nsides = 3 + len(self.get_mask())
psi = math.atan2(dy, dx) + (math.pi/nsides)
psi += math.pi
for i in xrange(nsides):
theta = 2.0 * math.pi * i / nsides
theta += psi
px = int(x + size*math.cos(theta))
py = int(y + size*math.sin(theta))
col = self.get_color_at_position(px, py, ignore_mask=True)
shape.append(col)
mask = self.get_mask()
mask.append(shape)
self.set_mask(mask)
def setUp(self):
if not mypaintlib.heavy_debug:
self.skipTest("not compiled with HEAVY_DEBUG")
# Unpremultiplied floating-point RGBA tuples
self.sample_data = []
# Make some alpha/grey/color combinations
for a in ALPHA_VALUES:
for v in GREY_VALUES:
self.sample_data.append((v, v, v, a))
for r in COLOR_COMPONENT_VALUES:
for g in COLOR_COMPONENT_VALUES:
for b in COLOR_COMPONENT_VALUES:
self.sample_data.append((r, g, b, a))
assert len(self.sample_data) < N
# What the hell, have some random junk too
for i in xrange(len(self.sample_data), N):
fuzz = (random(), random(), random(), random())
self.sample_data.append(fuzz)
assert len(self.sample_data) == N
# Prepare striped test data in a tile array
self.src = np.empty((N, N, 4), dtype='uint16')
self.dst_orig = np.empty((N, N, 4), dtype='uint16')
for i, rgba1 in enumerate(self.sample_data):
r1 = int(FIX15_ONE * rgba1[0] * rgba1[3])
g1 = int(FIX15_ONE * rgba1[1] * rgba1[3])
b1 = int(FIX15_ONE * rgba1[2] * rgba1[3])
a1 = int(FIX15_ONE * rgba1[3])
assert r1 <= FIX15_ONE
assert r1 >= 0
assert g1 <= FIX15_ONE
assert g1 >= 0
assert b1 <= FIX15_ONE
assert b1 >= 0
assert a1 <= FIX15_ONE
assert a1 >= 0
assert r1 <= a1
assert g1 <= a1
assert b1 <= a1
for j in xrange(len(self.sample_data)):
self.src[i, j, :] = (r1, g1, b1, a1)
self.dst_orig[j, i, :] = (r1, g1, b1, a1)
def new_from_pixbuf_average(class_, pixbuf):
"""Returns the the average of all colors in a pixbuf.
>>> p = GdkPixbuf.Pixbuf.new(GdkPixbuf.Colorspace.RGB, True, 8, 5, 5)
>>> p.fill(0x880088ff)
>>> UIColor.new_from_pixbuf_average(p).to_hex_str()
'#880088'
"""
assert pixbuf.get_colorspace() == GdkPixbuf.Colorspace.RGB
assert pixbuf.get_bits_per_sample() == 8
n_channels = pixbuf.get_n_channels()
assert n_channels in (3, 4)
if n_channels == 3:
assert not pixbuf.get_has_alpha()
else:
assert pixbuf.get_has_alpha()
data = pixbuf.get_pixels()
assert isinstance(data, bytes)
w, h = pixbuf.get_width(), pixbuf.get_height()
rowstride = pixbuf.get_rowstride()
n_pixels = w*h
r = g = b = 0
for y in xrange(h):
for x in xrange(w):
offs = y*rowstride + x*n_channels
if PY3:
# bytes=bytes. Indexing produces ints.
r += data[offs]
g += data[offs+1]
b += data[offs+2]
else:
# bytes=str. Indexing of produces a str of len 1.
r += ord(data[offs])
g += ord(data[offs+1])
b += ord(data[offs+2])
r = r / n_pixels
g = g / n_pixels
b = b / n_pixels
return RGBColor(r/255, g/255, b/255)
def new_from_pixbuf_average(class_, pixbuf):
"""Returns the the average of all colors in a pixbuf.
>>> p = GdkPixbuf.Pixbuf.new(GdkPixbuf.Colorspace.RGB, True, 8, 5, 5)
>>> p.fill(0x880088ff)
>>> UIColor.new_from_pixbuf_average(p).to_hex_str()
'#880088'
"""
assert pixbuf.get_colorspace() == GdkPixbuf.Colorspace.RGB
assert pixbuf.get_bits_per_sample() == 8
n_channels = pixbuf.get_n_channels()
assert n_channels in (3, 4)
if n_channels == 3:
assert not pixbuf.get_has_alpha()
else:
assert pixbuf.get_has_alpha()
data = pixbuf.get_pixels()
assert isinstance(data, bytes)
w, h = pixbuf.get_width(), pixbuf.get_height()
rowstride = pixbuf.get_rowstride()
n_pixels = w * h
r = g = b = 0
for y in xrange(h):
for x in xrange(w):
offs = y * rowstride + x * n_channels
if PY3:
# bytes=bytes. Indexing produces ints.
r += data[offs]
g += data[offs + 1]
b += data[offs + 2]
else:
# bytes=str. Indexing of produces a str of len 1.
r += ord(data[offs])
g += ord(data[offs + 1])
b += ord(data[offs + 2])
r = r / n_pixels
g = g / n_pixels
b = b / n_pixels
return RGBColor(r / 255, g / 255, b / 255)
def add_distance_fade_stops(gr, rgb, nstops=3, gamma=2, alpha=1.0):
"""Adds rgba stops to a Cairo gradient approximating a power law fade.
The stops have even spacing between the 0 and 1 positions, and alpha
values diminishing from 1 to 0. When `gamma` is greater than 1, the
generated fades or glow diminishes faster than a linear gradient. This
seems to reduce halo artifacts on some LCD backlit displays.
"""
red, green, blue = rgb
nstops = int(nstops) + 2
for s in xrange(nstops+1):
a = alpha * (((nstops - s) / nstops) ** gamma)
stop = s / nstops
gr.add_color_stop_rgba(stop, red, green, blue, a)
def add_distance_fade_stops(gr, rgb, nstops=3, gamma=2, alpha=1.0):
"""Adds rgba stops to a Cairo gradient approximating a power law fade.
The stops have even spacing between the 0 and 1 positions, and alpha
values diminishing from 1 to 0. When `gamma` is greater than 1, the
generated fades or glow diminishes faster than a linear gradient. This
seems to reduce halo artefacts on some LCD backlit displays.
"""
red, green, blue = rgb
nstops = int(nstops) + 2
for s in xrange(nstops+1):
a = alpha * (((nstops - s) / nstops) ** gamma)
stop = s / nstops
gr.add_color_stop_rgba(stop, red, green, blue, a)
def consume_buf():
ty = state['ty']-1
for i in xrange(state['buf'].shape[1] // N):
tx = x // N + i
src = state['buf'][:, i*N:(i+1)*N, :]
if src[:, :, 3].any():
with self.tile_request(tx, ty, readonly=False) as dst:
mypaintlib.tile_convert_rgba8_to_rgba16(src, dst)
if state["progress"]:
try:
state["progress"].completed(ty - ty0)
except Exception:
logger.exception("Progress.completed() failed")
state["progress"] = None
def render_background_cb(self, cr, wd, ht, icon_border=None):
v = self._conf.get_value()
col = self.__get_central_color()
b = icon_border
if b is None:
b = self.BORDER_WIDTH
eff_wd = int(wd - 2 * b)
eff_ht = int(ht - 2 * b)
f1, f2 = self.__get_faces()
step = max(1, int(eff_wd // 128))
rect_x, rect_y = int(b) + 0.5, int(b) + 0.5
rect_w, rect_h = int(eff_wd) - 1, int(eff_ht) - 1
# Paint the central area offscreen
cr.push_group()
for x in xrange(0, eff_wd, step):
# xmin <= amt <= xmax
amt = x / eff_wd
setattr(col, f1, map_to_range(v.xmin, v.xmax, amt))
# ymin <= f2 <= ymax
setattr(col, f2, v.ymax)
lg = cairo.LinearGradient(b + x, b, b + x, b + eff_ht)
lg.add_color_stop_rgb(*([0.0] + list(col.get_rgb())))
setattr(col, f2, v.ymin)
lg.add_color_stop_rgb(*([1.0] + list(col.get_rgb())))
cr.rectangle(b + x, b, step, eff_ht)
cr.set_source(lg)
cr.fill()
slice_patt = cr.pop_group()
# Tango-like outline
cr.set_line_join(cairo.LINE_JOIN_ROUND)
cr.rectangle(rect_x, rect_y, rect_w, rect_h)
cr.set_line_width(self.OUTLINE_WIDTH)
cr.set_source_rgba(*self.OUTLINE_RGBA)
cr.stroke()
# The main area
cr.set_source(slice_patt)
cr.paint()
# Tango-like highlight over the top
cr.rectangle(rect_x, rect_y, rect_w, rect_h)
cr.set_line_width(self.EDGE_HIGHLIGHT_WIDTH)
cr.set_source_rgba(*self.EDGE_HIGHLIGHT_RGBA)
cr.stroke()
def _init_default_brushkeys_and_history(self):
"""Assign sensible defaults for brushkeys and history.
Operates by filling in the gaps after `_init_unordered_groups()`
has had a chance to populate the two lists.
"""
# Try the default startup group first.
default_group = self.groups.get(_DEFAULT_STARTUP_GROUP, None)
# Otherwise, use the biggest group to minimise the chance
# of repetition.
if default_group is None:
groups_by_len = sorted(
(len(g), n, g) for n, g in self.groups.items())
_len, _name, default_group = groups_by_len[-1]
# Populate blank entries.
for i in xrange(_NUM_BRUSHKEYS):
if self.contexts[i] is None:
idx = (i + 9) % 10 # keyboard order
c_name = unicode('context%02d') % i
c = ManagedBrush(self, name=c_name, persistent=False)
group_idx = idx % len(default_group)
b = default_group[group_idx]
b.clone_into(c, c_name)
self.contexts[i] = c
for i in xrange(_BRUSH_HISTORY_SIZE):
if self.history[i] is None:
h_name = unicode('%s%d') % (_BRUSH_HISTORY_NAME_PREFIX, i)
h = ManagedBrush(self, name=h_name, persistent=False)
group_i = i % len(default_group)
b = default_group[group_i]
b.clone_into(h, h_name)
self.history[i] = h
def remove_all_tool_widgets(self):
"""Remove all tool widgets in the stack, without cleanup
This method is only intended to be used right before the
parent of a ToolStack is destroyed. It does not remove
any placeholders, only the individual tool widgets.
"""
for notebook in self._get_notebooks():
for index in xrange(notebook.get_n_pages()):
page = notebook.get_nth_page(index)
widget = page.get_child()
widget.hide()
page.remove(widget)
if self.workspace:
self.workspace.tool_widget_removed(widget)
def _regenerate_mipmap(self, t, tx, ty):
t = _Tile()
self.tiledict[(tx, ty)] = t
empty = True
for x in xrange(2):
for y in xrange(2):
src = self.parent.tiledict.get((tx*2 + x, ty*2 + y),
transparent_tile)
if src is mipmap_dirty_tile:
src = self.parent._regenerate_mipmap(
src,
tx*2 + x, ty*2 + y,
)
mypaintlib.tile_downscale_rgba16(src.rgba, t.rgba,
x * N // 2,
y * N // 2)
if src.rgba is not transparent_tile.rgba:
empty = False
if empty:
# rare case, no need to speed it up
del self.tiledict[(tx, ty)]
t = transparent_tile
return t
def _outwards_from(n, i):
"""Search order within the palette, outwards from a given index.
Defined for a sequence of len() `n`, outwards from index `i`.
"""
assert i < n and i >= 0
yield i
for j in xrange(n):
exhausted = True
if i - j >= 0:
yield i - j
exhausted = False
if i + j < n:
yield i + j
exhausted = False
if exhausted:
break
def _outwards_from(n, i):
"""Search order within the palette, outwards from a given index.
Defined for a sequence of len() `n`, outwards from index `i`.
"""
assert i < n and i >= 0
yield i
for j in xrange(n):
exhausted = True
if i - j >= 0:
yield i - j
exhausted = False
if i + j < n:
yield i + j
exhausted = False
if exhausted:
break
def render_background_cb(self, cr, wd, ht, icon_border=None):
col = HSVColor(color=self.get_managed_color())
b = icon_border
if b is None:
b = self.BORDER_WIDTH
eff_wd = int(wd - 2*b)
eff_ht = int(ht - 2*b)
f1, f2 = self.__get_faces()
step = max(1, int(eff_wd // 128))
rect_x, rect_y = int(b)+0.5, int(b)+0.5
rect_w, rect_h = int(eff_wd)-1, int(eff_ht)-1
# Paint the central area offscreen
cr.push_group()
for x in xrange(0, eff_wd, step):
amt = x / eff_wd
setattr(col, f1, amt)
setattr(col, f2, 1.0)
lg = cairo.LinearGradient(b+x, b, b+x, b+eff_ht)
lg.add_color_stop_rgb(*([0.0] + list(col.get_rgb())))
setattr(col, f2, 0.0)
lg.add_color_stop_rgb(*([1.0] + list(col.get_rgb())))
cr.rectangle(b+x, b, step, eff_ht)
cr.set_source(lg)
cr.fill()
slice_patt = cr.pop_group()
# Tango-like outline
cr.set_line_join(cairo.LINE_JOIN_ROUND)
cr.rectangle(rect_x, rect_y, rect_w, rect_h)
cr.set_line_width(self.OUTLINE_WIDTH)
cr.set_source_rgba(*self.OUTLINE_RGBA)
cr.stroke()
# The main area
cr.set_source(slice_patt)
cr.paint()
# Tango-like highlight over the top
cr.rectangle(rect_x, rect_y, rect_w, rect_h)
cr.set_line_width(self.EDGE_HIGHLIGHT_WIDTH)
cr.set_source_rgba(*self.EDGE_HIGHLIGHT_RGBA)
cr.stroke()
def interpolate(self, other, steps):
"""RGB interpolation.
>>> white = RGBColor(r=1, g=1, b=1)
>>> black = RGBColor(r=0, g=0, b=0)
>>> [c.to_hex_str() for c in white.interpolate(black, 3)]
['#ffffff', '#7f7f7f', '#000000']
>>> [c.to_hex_str() for c in black.interpolate(white, 3)]
['#000000', '#7f7f7f', '#ffffff']
"""
assert steps >= 3
other = RGBColor(color=other)
for step in xrange(steps):
p = step / (steps - 1)
r = self.r + (other.r - self.r) * p
g = self.g + (other.g - self.g) * p
b = self.b + (other.b - self.b) * p
yield RGBColor(r=r, g=g, b=b)
def interpolate(self, other, steps):
"""RGB interpolation.
>>> white = RGBColor(r=1, g=1, b=1)
>>> black = RGBColor(r=0, g=0, b=0)
>>> [c.to_hex_str() for c in white.interpolate(black, 3)]
['#ffffff', '#7f7f7f', '#000000']
>>> [c.to_hex_str() for c in black.interpolate(white, 3)]
['#000000', '#7f7f7f', '#ffffff']
"""
assert steps >= 3
other = RGBColor(color=other)
for step in xrange(steps):
p = step / (steps - 1)
r = self.r + (other.r - self.r) * p
g = self.g + (other.g - self.g) * p
b = self.b + (other.b - self.b) * p
yield RGBColor(r=r, g=g, b=b)
def processSound(self):
while True:
try:
self.data_ready.wait()
self.data_ready.clear()
# horrible hack, the render_layer_as_pixbuf reads one pixel ahead, so we bring
# the rendering window back before getting color data
actual_row = self.active_row[:]
actual_row[0] -= 1
pixbuf = self.app.doc.model._layers.render_layer_as_pixbuf(
self.app.doc.model._layers, actual_row)
n_channels = pixbuf.get_n_channels()
assert n_channels in (3, 4)
data = pixbuf.get_pixels()
colors = []
rowstride = pixbuf.get_rowstride()
for y in xrange(min(self.active_row[3], pixbuf.get_height())):
if PY3:
col = lib.color.RGBColor(
data[y * rowstride + n_channels] / 255,
data[y * rowstride + n_channels + 1] / 255,
data[y * rowstride + n_channels + 2] / 255,
)
else:
col = lib.color.RGBColor(
ord(data[y * rowstride + n_channels]) / 255,
ord(data[y * rowstride + n_channels + 1]) / 255,
ord(data[y * rowstride + n_channels + 2]) / 255,
)
colors.append(col)
# print("step {}, colors: {}".format(self.step, colors))
for c in self.consumers:
c.data_ready(colors)
except Exception as e:
print("error getting color data: {}".format(e))
def render_background_cb(self, cr, wd, ht):
b = self.BORDER_WIDTH
bar_length = (self.vertical and ht or wd) - b - b
b_x = b + 0.5
b_y = b + 0.5
b_w = wd - b - b - 1
b_h = ht - b - b - 1
# Build the gradient
if self.vertical:
bar_gradient = cairo.LinearGradient(0, b, 0, b + bar_length)
else:
bar_gradient = cairo.LinearGradient(b, 0, b + bar_length, 0)
samples = self.samples + 2
for s in xrange(samples + 1):
p = s / samples
col = self.get_color_for_bar_amount(p)
r, g, b = col.get_rgb()
if self.vertical:
p = 1 - p
bar_gradient.add_color_stop_rgb(p, r, g, b)
# Paint bar with Tango-like edges
cr.set_line_join(cairo.LINE_JOIN_ROUND)
cr.set_source_rgba(*self.OUTLINE_RGBA)
cr.set_line_width(self.OUTLINE_WIDTH)
cr.rectangle(b_x, b_y, b_w, b_h)
cr.stroke()
## Paint bar
cr.set_source(bar_gradient)
cr.rectangle(b_x - 0.5, b_y - 0.5, b_w + 1, b_h + 1)
cr.fill()
## Highlighted edge
if b_w > 5 and b_h > 5:
cr.set_line_width(self.EDGE_HIGHLIGHT_WIDTH)
cr.set_source_rgba(*self.EDGE_HIGHLIGHT_RGBA)
cr.rectangle(b_x, b_y, b_w, b_h)
cr.stroke()
def render_background_cb(self, cr, wd, ht):
b = self.BORDER_WIDTH
bar_length = (self.vertical and ht or wd) - b - b
b_x = b + 0.5
b_y = b + 0.5
b_w = wd - b - b - 1
b_h = ht - b - b - 1
# Build the gradient
if self.vertical:
bar_gradient = cairo.LinearGradient(0, b, 0, b + bar_length)
else:
bar_gradient = cairo.LinearGradient(b, 0, b + bar_length, 0)
samples = self.samples + 2
for s in xrange(samples + 1):
p = s / samples
col = self.get_color_for_bar_amount(p)
r, g, b = col.get_rgb()
if self.vertical:
p = 1 - p
bar_gradient.add_color_stop_rgb(p, r, g, b)
# Paint bar with Tango-like edges
cr.set_line_join(cairo.LINE_JOIN_ROUND)
cr.set_source_rgba(*self.OUTLINE_RGBA)
cr.set_line_width(self.OUTLINE_WIDTH)
cr.rectangle(b_x, b_y, b_w, b_h)
cr.stroke()
## Paint bar
cr.set_source(bar_gradient)
cr.rectangle(b_x - 0.5, b_y - 0.5, b_w + 1, b_h + 1)
cr.fill()
## Highlighted edge
if b_w > 5 and b_h > 5:
cr.set_line_width(self.EDGE_HIGHLIGHT_WIDTH)
cr.set_source_rgba(*self.EDGE_HIGHLIGHT_RGBA)
cr.rectangle(b_x, b_y, b_w, b_h)
cr.stroke()
def interpolate(self, other, steps):
"""HCY interpolation.
>>> red = HCYColor(0, 0.8, 0.5)
>>> green = HCYColor(1./3, 0.8, 0.5)
>>> [c.to_hex_str() for c in green.interpolate(red, 5)]
['#19c619', '#5ea319', '#8c8c19', '#c46f19', '#e55353']
>>> [c.to_hex_str() for c in red.interpolate(green, 5)]
['#e55353', '#c46f19', '#8c8c19', '#5ea319', '#19c619']
HCY is a cylindrical space, so interpolations between two endpoints of
the same chroma will preserve that chroma. RGB interpoloation tends to
diminish because the interpolation will pass near the diagonal of zero
chroma.
>>> [i.c for i in red.interpolate(green, 5)]
[0.8, 0.8, 0.8, 0.8, 0.8]
>>> red_rgb = RGBColor(color=red)
>>> [round(HCYColor(color=i).c, 3)
... for i in red_rgb.interpolate(green, 5)]
[0.8, 0.457, 0.571, 0.686, 0.8]
"""
assert steps >= 3
other = HCYColor(color=other)
# Like HSV, interpolate using the shortest angular distance.
ha = self.h % 1.0
hb = other.h % 1.0
hdelta = hb - ha
for hdx0 in -(ha + 1 - hb), (hb + 1 - ha):
if abs(hdx0) < abs(hdelta):
hdelta = hdx0
for step in xrange(steps):
p = step / (steps - 1)
h = (self.h + hdelta * p) % 1.0
c = self.c + (other.c - self.c) * p
y = self.y + (other.y - self.y) * p
yield HCYColor(h=h, c=c, y=y)
def interpolate(self, other, steps):
"""HCY interpolation.
>>> red = HCYColor(0, 0.8, 0.5)
>>> green = HCYColor(1./3, 0.8, 0.5)
>>> [c.to_hex_str() for c in green.interpolate(red, 5)]
['#19c619', '#5ea319', '#8c8c19', '#c46f19', '#e55353']
>>> [c.to_hex_str() for c in red.interpolate(green, 5)]
['#e55353', '#c46f19', '#8c8c19', '#5ea319', '#19c619']
HCY is a cylindrical space, so interpolations between two endpoints of
the same chroma will preserve that chroma. RGB interpoloation tends to
diminish because the interpolation will pass near the diagonal of zero
chroma.
>>> [i.c for i in red.interpolate(green, 5)]
[0.8, 0.8, 0.8, 0.8, 0.8]
>>> red_rgb = RGBColor(color=red)
>>> [round(HCYColor(color=i).c, 3)
... for i in red_rgb.interpolate(green, 5)]
[0.8, 0.457, 0.571, 0.686, 0.8]
"""
assert steps >= 3
other = HCYColor(color=other)
# Like HSV, interpolate using the shortest angular distance.
ha = self.h % 1.0
hb = other.h % 1.0
hdelta = hb - ha
for hdx0 in -(ha+1-hb), (hb+1-ha):
if abs(hdx0) < abs(hdelta):
hdelta = hdx0
for step in xrange(steps):
p = step / (steps - 1)
h = (self.h + hdelta * p) % 1.0
c = self.c + (other.c - self.c) * p
y = self.y + (other.y - self.y) * p
yield HCYColor(h=h, c=c, y=y)
def interpolate(self, other, steps):
"""HSV interpolation, sometimes nicer looking than RGB.
>>> red_hsv = HSVColor(h=0, s=1, v=1)
>>> green_hsv = HSVColor(h=1./3, s=1, v=1)
>>> [c.to_hex_str() for c in green_hsv.interpolate(red_hsv, 3)]
['#00ff00', '#ffff00', '#ff0000']
>>> [c.to_hex_str() for c in red_hsv.interpolate(green_hsv, 3)]
['#ff0000', '#ffff00', '#00ff00']
Note the pure yellow. Interpolations in RGB space are duller looking:
>>> red_rgb = RGBColor(color=red_hsv)
>>> [c.to_hex_str() for c in red_rgb.interpolate(green_hsv, 3)]
['#ff0000', '#7f7f00', '#00ff00']
"""
assert steps >= 3
other = HSVColor(color=other)
# Calculate the shortest angular distance
# Normalize first
ha = self.h % 1.0
hb = other.h % 1.0
# If the shortest distance doesn't pass through zero, then
hdelta = hb - ha
# But the shortest distance might pass through zero either antilockwise
# or clockwise. Smallest magnitude wins.
for hdx0 in -(ha+1-hb), (hb+1-ha):
if abs(hdx0) < abs(hdelta):
hdelta = hdx0
# Interpolate, using shortest angular dist for hue
for step in xrange(steps):
p = step / (steps - 1)
h = (self.h + hdelta * p) % 1.0
s = self.s + (other.s - self.s) * p
v = self.v + (other.v - self.v) * p
yield HSVColor(h=h, s=s, v=v)
def interpolate(self, other, steps):
"""HSV interpolation, sometimes nicer looking than RGB.
>>> red_hsv = HSVColor(h=0, s=1, v=1)
>>> green_hsv = HSVColor(h=1./3, s=1, v=1)
>>> [c.to_hex_str() for c in green_hsv.interpolate(red_hsv, 3)]
['#00ff00', '#ffff00', '#ff0000']
>>> [c.to_hex_str() for c in red_hsv.interpolate(green_hsv, 3)]
['#ff0000', '#ffff00', '#00ff00']
Note the pure yellow. Interpolations in RGB space are duller looking:
>>> red_rgb = RGBColor(color=red_hsv)
>>> [c.to_hex_str() for c in red_rgb.interpolate(green_hsv, 3)]
['#ff0000', '#7f7f00', '#00ff00']
"""
assert steps >= 3
other = HSVColor(color=other)
# Calculate the shortest angular distance
# Normalize first
ha = self.h % 1.0
hb = other.h % 1.0
# If the shortest distance doesn't pass through zero, then
hdelta = hb - ha
# But the shortest distance might pass through zero either antilockwise
# or clockwise. Smallest magnitude wins.
for hdx0 in -(ha + 1 - hb), (hb + 1 - ha):
if abs(hdx0) < abs(hdelta):
hdelta = hdx0
# Interpolate, using shortest angular dist for hue
for step in xrange(steps):
p = step / (steps - 1)
h = (self.h + hdelta * p) % 1.0
s = self.s + (other.s - self.s) * p
v = self.v + (other.v - self.v) * p
yield HSVColor(h=h, s=s, v=v)
def remove_tool_widget(self, widget):
"""Removes a tool widget from the stack, hiding it
:param widget: the GType name of the tab to be removed.
:type widget: Gtk.Widget created by the Workspace's factory
:rtype: bool
:returns: whether the widget was removed
"""
target_notebook = None
target_index = None
target_page = None
for notebook in self._get_notebooks():
for index in xrange(notebook.get_n_pages()):
page = notebook.get_nth_page(index)
if widget is page.get_child():
target_index = index
target_notebook = notebook
target_page = page
break
if target_notebook:
break
if target_notebook:
assert target_page is not None
assert target_index is not None
logger.debug("Removing tool widget i=%d, p=%r, n=%r", target_index,
target_page, target_notebook)
target_page.hide()
widget.hide()
target_page.remove(widget)
target_notebook.remove_page(target_index)
target_page.destroy()
if self.workspace:
self.workspace.tool_widget_removed(widget)
return True
return False
if __name__ == '__main__':
from random import randint
win = Gtk.Window()
win.set_title("cursor test")
min_size = 5
max_size = 64
nsteps = 8
w = nsteps * max_size
h = 4 * max_size
surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, w, h)
cr = cairo.Context(surf)
cr.set_source_rgb(.7, .7, .7)
cr.paint()
for style in xrange(4):
col = 0
for size in xrange(min_size, max_size + 1,
(max_size - min_size) // nsteps):
cr.save()
y = (style * max_size) + ((max_size - size)/2)
x = (col * max_size) + ((max_size - size)/2)
cr.translate(x, y)
draw_brush_cursor(cr, size, style)
cr.restore()
col += 1
pixbuf = _image_surface_to_pixbuf(surf)
image = Gtk.Image()
image.set_from_pixbuf(pixbuf)
image.set_size_request(w, h)
def render_background_cb(self, cr, wd, ht, icon_border=None):
"""Renders the offscreen bg, for `ColorAdjusterWidget` impls.
"""
cr.save()
ref_grey = self.color_at_normalized_polar_pos(0, 0)
border = icon_border
if border is None:
border = self.BORDER_WIDTH
radius = self.get_radius(wd, ht, border)
steps = self.HUE_SLICES
sat_slices = self.SAT_SLICES
sat_gamma = self.SAT_GAMMA
# Move to the centre
cx, cy = self.get_center(wd, ht)
cr.translate(cx, cy)
# Clip, for a slight speedup
cr.arc(0, 0, radius + border, 0, 2 * math.pi)
cr.clip()
# Tangoesque outer border
cr.set_line_width(self.OUTLINE_WIDTH)
cr.arc(0, 0, radius, 0, 2 * math.pi)
cr.set_source_rgba(*self.OUTLINE_RGBA)
cr.stroke()
# Each slice in turn
cr.save()
cr.set_line_width(1.0)
cr.set_line_join(cairo.LINE_JOIN_ROUND)
step_angle = 2.0 * math.pi / steps
mgr = self.get_color_manager()
for ih in xrange(steps + 1): # overshoot by 1, no solid bit for final
h = ih / steps
if mgr:
h = mgr.undistort_hue(h)
edge_col = self.color_at_normalized_polar_pos(1.0, h)
rgb = edge_col.get_rgb()
if ih > 0:
# Backwards gradient
cr.arc_negative(0, 0, radius, 0, -step_angle)
x, y = cr.get_current_point()
cr.line_to(0, 0)
cr.close_path()
lg = cairo.LinearGradient(radius, 0, (x + radius) / 2, y)
lg.add_color_stop_rgba(0, rgb[0], rgb[1], rgb[2], 1.0)
lg.add_color_stop_rgba(1, rgb[0], rgb[1], rgb[2], 0.0)
cr.set_source(lg)
cr.fill()
if ih < steps:
# Forward solid
cr.arc(0, 0, radius, 0, step_angle)
x, y = cr.get_current_point()
cr.line_to(0, 0)
cr.close_path()
cr.set_source_rgb(*rgb)
cr.stroke_preserve()
cr.fill()
cr.rotate(step_angle)
cr.restore()
# Cheeky approximation of the right desaturation gradients
rg = cairo.RadialGradient(0, 0, 0, 0, 0, radius)
add_distance_fade_stops(rg, ref_grey.get_rgb(),
nstops=sat_slices,
gamma=1.0 / sat_gamma)
cr.set_source(rg)
cr.arc(0, 0, radius, 0, 2 * math.pi)
cr.fill()
# Tangoesque inner border
cr.set_source_rgba(*self.EDGE_HIGHLIGHT_RGBA)
cr.set_line_width(self.EDGE_HIGHLIGHT_WIDTH)
cr.arc(0, 0, radius, 0, 2 * math.pi)
cr.stroke()
# Some small notches on the disc edge for pure colors
if wd > 75 or ht > 75:
cr.save()
cr.arc(0, 0, radius + self.EDGE_HIGHLIGHT_WIDTH, 0, 2 * math.pi)
cr.clip()
pure_cols = [
RGBColor(1, 0, 0), RGBColor(1, 1, 0), RGBColor(0, 1, 0),
RGBColor(0, 1, 1), RGBColor(0, 0, 1), RGBColor(1, 0, 1),
]
for col in pure_cols:
x, y = self.get_pos_for_color(col)
x = int(x) - cx
y = int(y) - cy
cr.set_source_rgba(*self.EDGE_HIGHLIGHT_RGBA)
cr.arc(
x + 0.5, y + 0.5,
1.0 + self.EDGE_HIGHLIGHT_WIDTH,
0, 2 * math.pi,
)
cr.fill()
cr.set_source_rgba(*self.OUTLINE_RGBA)
cr.arc(
x + 0.5, y + 0.5,
self.EDGE_HIGHLIGHT_WIDTH,
0, 2 * math.pi,
)
cr.fill()
cr.restore()
cr.restore()
def scanline_strips_iter(surface, rect, alpha=False,
single_tile_pattern=False, **kwargs):
"""Generate (render) scanline strips from a tile-blittable object
:param lib.surface.TileBlittable surface: Surface to iterate over
:param bool alpha: If true, write a PNG with alpha
:param bool single_tile_pattern: True if surface is a one tile only.
:param tuple \*\*kwargs: Passed to blit_tile_into.
The `alpha` parameter is passed to the surface's `blit_tile_into()`.
Rendering is skipped for all but the first line of single-tile patterns.
The scanline strips yielded by this generator are suitable for
feeding to a mypaintlib.ProgressivePNGWriter.
"""
# Sizes
x, y, w, h = rect
assert w > 0
assert h > 0
# calculate bounding box in full tiles
render_tx = x // N
render_ty = y // N
render_tw = (x + w - 1) // N - render_tx + 1
render_th = (y + h - 1) // N - render_ty + 1
# buffer for rendering one tile row at a time
arr = np.empty((N, render_tw * N, 4), 'uint8') # rgba or rgbu
# view into arr without the horizontal padding
arr_xcrop = arr[:, x-render_tx*N:x-render_tx*N+w, :]
first_row = render_ty
last_row = render_ty+render_th-1
for ty in range(render_ty, render_ty+render_th):
skip_rendering = False
if single_tile_pattern:
# optimization for simple background patterns
# e.g. solid color
if ty != first_row:
skip_rendering = True
for tx_rel in xrange(render_tw):
# render one tile
dst = arr[:, tx_rel*N:(tx_rel+1)*N, :]
if not skip_rendering:
tx = render_tx + tx_rel
try:
surface.blit_tile_into(dst, alpha, tx, ty, **kwargs)
except Exception:
logger.exception("Failed to blit tile %r of %r",
(tx, ty), surface)
mypaintlib.tile_clear_rgba8(dst)
# yield a numpy array of the scanline without padding
res = arr_xcrop
if ty == last_row:
res = res[:y+h-ty*N, :, :]
if ty == first_row:
res = res[y-render_ty*N:, :, :]
yield res
def render_background_cb(self, cr, wd, ht, icon_border=None):
"""Renders the offscreen bg, for `ColorAdjusterWidget` impls.
"""
cr.save()
border = icon_border
if border is None:
border = self.BORDER_WIDTH
radius = self.get_radius(wd, ht, border)
steps = self.HUE_SLICES
# Move to the centre
cx, cy = self.get_center(wd, ht)
cr.translate(cx, cy)
# Clip, for a slight speedup
cr.arc(0, 0, radius+border, 0, 2*math.pi)
cr.clip()
# Tangoesque outer border
cr.set_line_width(self.OUTLINE_WIDTH)
cr.arc(0, 0, radius, 0, 2*math.pi)
cr.set_source_rgba(*self.OUTLINE_RGBA)
cr.stroke()
# Each slice in turn
cr.save()
cr.set_line_width(1.0)
cr.set_line_join(cairo.LINE_JOIN_ROUND)
step_angle = 2.0*math.pi/steps
mgr = self.get_color_manager()
for ih in xrange(steps+1): # overshoot by 1, no solid bit for final
h = ih / steps
if mgr:
h = mgr.undistort_hue(h)
edge_col = self.color_at_normalized_polar_pos(1.0, h)
edge_col.s = 1.0
edge_col.v = 1.0
rgb = edge_col.get_rgb()
if ih > 0:
# Backwards gradient
cr.arc_negative(0, 0, radius, 0, -step_angle)
x, y = cr.get_current_point()
cr.line_to(0, 0)
cr.close_path()
lg = cairo.LinearGradient(radius, 0, (x + radius) / 2, y)
lg.add_color_stop_rgba(0, rgb[0], rgb[1], rgb[2], 1.0)
lg.add_color_stop_rgba(1, rgb[0], rgb[1], rgb[2], 0.0)
cr.set_source(lg)
cr.fill()
if ih < steps:
# Forward solid
cr.arc(0, 0, radius, 0, step_angle)
x, y = cr.get_current_point()
cr.line_to(0, 0)
cr.close_path()
cr.set_source_rgb(*rgb)
cr.stroke_preserve()
cr.fill()
cr.rotate(step_angle)
cr.restore()
# Tangoesque inner border
cr.set_source_rgba(*self.EDGE_HIGHLIGHT_RGBA)
cr.set_line_width(self.EDGE_HIGHLIGHT_WIDTH)
cr.arc(0, 0, radius, 0, 2*math.pi)
cr.stroke()
cr.set_line_width(self.OUTLINE_WIDTH)
cr.arc(0, 0, radius*0.8, 0, 2*math.pi)
cr.set_source_rgba(0, 0, 0, 1)
cr.set_operator(cairo.OPERATOR_DEST_OUT)
cr.fill()
cr.set_operator(cairo.OPERATOR_OVER)
cr.set_source_rgba(*self.OUTLINE_RGBA)
cr.stroke()
cr.set_source_rgba(*self.EDGE_HIGHLIGHT_RGBA)
cr.set_line_width(self.EDGE_HIGHLIGHT_WIDTH)
cr.arc(0, 0, radius*0.8, 0, 2*math.pi)
cr.stroke()
def __update_active_objects(self, x, y):
# Decides what a click or a drag at (x, y) would do, and updates the
# mouse cursor and draw state to match.
assert self.__drag_func is None
self.__active_shape = None
self.__active_ctrlpoint = None
self.__tmp_new_ctrlpoint = None
self.queue_draw() # yes, always
# Possible mask void manipulations
mask = self.get_mask()
for mask_idx in xrange(len(mask)):
colors = mask[mask_idx]
if len(colors) < 3:
continue
# If the pointer is near an existing control point, clicking and
# dragging will move it.
void = []
for col_idx in xrange(len(colors)):
col = colors[col_idx]
px, py = self.get_pos_for_color(col)
dp = math.sqrt((x-px)**2 + (y-py)**2)
if dp <= self.__ctrlpoint_grab_radius:
mask.remove(colors)
mask.insert(0, colors)
self.__active_shape = colors
self.__active_ctrlpoint = col_idx
self.__set_cursor(None)
return
void.append((px, py))
# If within a certain distance of an edge, dragging will create and
# then move a new control point.
void = geom.convex_hull(void)
for p1, p2 in geom.pairwise(void):
isect = geom.nearest_point_in_segment(p1, p2, (x, y))
if isect is not None:
ix, iy = isect
di = math.sqrt((ix-x)**2 + (iy-y)**2)
if di <= self.__ctrlpoint_grab_radius:
newcol = self.get_color_at_position(ix, iy)
self.__tmp_new_ctrlpoint = newcol
mask.remove(colors)
mask.insert(0, colors)
self.__active_shape = colors
self.__set_cursor(None)
return
# If the mouse is within a mask void, then dragging would move that
# shape around within the mask.
if geom.point_in_convex_poly((x, y), void):
mask.remove(colors)
mask.insert(0, colors)
self.__active_shape = colors
self.__set_cursor(None)
return
# Away from shapes, clicks and drags manipulate the entire mask: adding
# cutout voids to it, or rotating the whole mask around its central
# axis.
alloc = self.get_allocation()
cx, cy = self.get_center(alloc=alloc)
radius = self.get_radius(alloc=alloc)
dx, dy = x-cx, y-cy
r = math.sqrt(dx**2 + dy**2)
if r < radius*(1.0-self.min_shape_size):
if len(mask) < self.__max_num_shapes:
d = self.__dist_to_nearest_shape(x, y)
minsize = radius * self.min_shape_size
if d is None or d > minsize:
# Clicking will result in a new void
self.__set_cursor(self.__add_cursor)
else:
# Click-drag to rotate the entire mask
self.__set_cursor(self.__rotate_cursor)
def _scroll(tdw, model, width=1920, height=1080,
zoom=1.0, mirrored=False, rotation=0.0,
turns=8, turn_steps=8, turn_radius=0.3,
save_pngs=False,
set_modes=None,
use_background=True):
"""Test scroll performance
Scroll around in a circle centred on the virtual display, testing
the same sort of render that's used for display - albeit to an
in-memory surface.
This tests rendering and cache performance quite well, though it
discounts Cairo acceleration.
"""
num_undos_needed = 0
if set_modes:
for path, mode in set_modes.items():
model.select_layer(path=path)
num_undos_needed += 1
model.set_current_layer_mode(mode)
num_undos_needed += 1
assert model.layer_stack.deepget(path, None).mode == mode
model.layer_stack.background_visible = use_background
model.layer_stack._render_cache.clear()
radius = min(width, height) * turn_radius
fakealloc = namedtuple("FakeAlloc", ["x", "y", "width", "height"])
alloc = fakealloc(0, 0, width, height)
tdw.set_allocation(alloc)
surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
tdw.set_rotation(rotation)
tdw.set_zoom(zoom)
tdw.set_mirrored(mirrored)
tdw.recenter_document()
start = time.clock()
cx, cy = tdw.get_center()
last_x = cx
last_y = cy
nframes = 0
for turn_i in xrange(turns):
for step_i in xrange(turn_steps):
t = 2 * math.pi * (step_i / turn_steps)
x = cx + math.cos(t) * radius
y = cy + math.sin(t) * radius
dx = x - last_x
dy = y - last_y
cr = cairo.Context(surf)
cr.rectangle(*alloc)
cr.clip()
tdw.scroll(dx, dy)
tdw.renderer._draw_cb(tdw, cr)
surf.flush()
last_x = x
last_y = y
if save_pngs:
filename = "/tmp/scroll-%03d-%03d.png" % (turn_i, step_i)
surf.write_to_png(filename)
nframes += 1
dt = time.clock() - start
for i in range(num_undos_needed):
model.undo()
if set_modes:
for path in set_modes.keys():
mode = model.layer_stack.deepget(path, None).mode
assert mode == mypaintlib.CombineNormal
return (nframes, dt)
def match_color(self, col, exact=False, order=None):
"""Moves the match position to the color closest to the argument.
:param col: The color to match.
:type col: lib.color.UIColor
:param exact: Only consider exact matches, and not near-exact or
approximate matches.
:type exact: bool
:param order: a search order to use. Default is outwards from the
match position, or in order if the match is unset.
:type order: sequence or iterator of integer color indices.
:returns: Whether the match succeeded.
:rtype: bool
By default, the matching algorithm favours exact or near-exact matches
which are close to the current position. If the current position is
unset, this search starts at 0. If there are no exact or near-exact
matches, a looser approximate match will be used, again favouring
matches with nearby positions.
>>> red2blue = RGBColor(1, 0, 0).interpolate(RGBColor(0, 1, 1), 5)
>>> p = Palette(colors=red2blue)
>>> p.match_color(RGBColor(0.45, 0.45, 0.45))
True
>>> p.match_position
2
>>> p.match_is_approx
True
>>> p[p.match_position]
<RGBColor r=0.5000, g=0.5000, b=0.5000>
>>> p.match_color(RGBColor(0.5, 0.5, 0.5))
True
>>> p.match_is_approx
False
>>> p.match_color(RGBColor(0.45, 0.45, 0.45), exact=True)
False
>>> p.match_color(RGBColor(0.5, 0.5, 0.5), exact=True)
True
Fires the ``match_changed()`` event when changes happen.
"""
if order is not None:
search_order = order
elif self.match_position is not None:
search_order = _outwards_from(len(self), self.match_position)
else:
search_order = xrange(len(self))
bestmatch_i = None
bestmatch_d = None
is_approx = True
for i in search_order:
c = self._colors[i]
if c is self._EMPTY_SLOT_ITEM:
continue
# Closest exact or near-exact match by index distance (according to
# the search_order). Considering near-exact matches as equivalent
# to exact matches improves the feel of PaletteNext and
# PalettePrev.
if exact:
if c == col:
bestmatch_i = i
is_approx = False
break
else:
d = _color_distance(col, c)
if c == col or d < 0.06:
bestmatch_i = i
is_approx = False
break
if bestmatch_d is None or d < bestmatch_d:
bestmatch_i = i
bestmatch_d = d
# Measuring over a blend into solid equiluminant 0-chroma
# grey for the orange #DA5D2E with an opaque but feathered
# brush made huge, and picking just inside the point where the
# palette widget begins to call it approximate:
#
# 0.05 is a difference only discernible (to me) by tilting LCD
# 0.066 to 0.075 appears slightly greyer for large areas
# 0.1 and above is very clearly distinct
# If there are no exact or near-exact matches, choose the most similar
# color anywhere in the palette.
if bestmatch_i is not None:
self._match_position = bestmatch_i
self._match_is_approx = is_approx
self.match_changed()
return True
return False
def _scroll(tdw,
model,
width=1920,
height=1080,
zoom=1.0,
mirrored=False,
rotation=0.0,
turns=8,
turn_steps=8,
turn_radius=0.3,
save_pngs=False,
set_modes=None,
use_background=True):
"""Test scroll performance
Scroll around in a circle centred on the virtual display, testing
the same sort of render that's used for display - albeit to an
in-memory surface.
This tests rendering and cache performance quite well, though it
discounts Cairo acceleration.
"""
num_undos_needed = 0
if set_modes:
for path, mode in set_modes.items():
model.select_layer(path=path)
num_undos_needed += 1
model.set_current_layer_mode(mode)
num_undos_needed += 1
assert model.layer_stack.deepget(path, None).mode == mode
model.layer_stack.background_visible = use_background
model.layer_stack._render_cache.clear()
radius = min(width, height) * turn_radius
fakealloc = namedtuple("FakeAlloc", ["x", "y", "width", "height"])
alloc = fakealloc(0, 0, width, height)
tdw.set_allocation(alloc)
surf = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
tdw.set_rotation(rotation)
tdw.set_zoom(zoom)
tdw.set_mirrored(mirrored)
tdw.recenter_document()
start = time.clock()
cx, cy = tdw.get_center()
last_x = cx
last_y = cy
nframes = 0
for turn_i in xrange(turns):
for step_i in xrange(turn_steps):
t = 2 * math.pi * (step_i / turn_steps)
x = cx + math.cos(t) * radius
y = cy + math.sin(t) * radius
dx = x - last_x
dy = y - last_y
cr = cairo.Context(surf)
cr.rectangle(*alloc)
cr.clip()
tdw.scroll(dx, dy)
tdw.renderer._draw_cb(tdw, cr)
surf.flush()
last_x = x
last_y = y
if save_pngs:
filename = "/tmp/scroll-%03d-%03d.png" % (turn_i, step_i)
surf.write_to_png(filename)
nframes += 1
dt = time.clock() - start
for i in range(num_undos_needed):
model.undo()
if set_modes:
for path in set_modes.keys():
mode = model.layer_stack.deepget(path, None).mode
assert mode == mypaintlib.CombineNormal
return (nframes, dt)
def match_color(self, col, exact=False, order=None):
"""Moves the match position to the color closest to the argument.
:param col: The color to match.
:type col: lib.color.UIColor
:param exact: Only consider exact matches, and not near-exact or
approximate matches.
:type exact: bool
:param order: a search order to use. Default is outwards from the
match position, or in order if the match is unset.
:type order: sequence or iterator of integer color indices.
:returns: Whether the match succeeded.
:rtype: bool
By default, the matching algorithm favours exact or near-exact matches
which are close to the current position. If the current position is
unset, this search starts at 0. If there are no exact or near-exact
matches, a looser approximate match will be used, again favouring
matches with nearby positions.
>>> red2blue = RGBColor(1, 0, 0).interpolate(RGBColor(0, 1, 1), 5)
>>> p = Palette(colors=red2blue)
>>> p.match_color(RGBColor(0.45, 0.45, 0.45))
True
>>> p.match_position
2
>>> p.match_is_approx
True
>>> p[p.match_position]
<RGBColor r=0.5000, g=0.5000, b=0.5000>
>>> p.match_color(RGBColor(0.5, 0.5, 0.5))
True
>>> p.match_is_approx
False
>>> p.match_color(RGBColor(0.45, 0.45, 0.45), exact=True)
False
>>> p.match_color(RGBColor(0.5, 0.5, 0.5), exact=True)
True
Fires the ``match_changed()`` event when changes happen.
"""
if order is not None:
search_order = order
elif self.match_position is not None:
search_order = _outwards_from(len(self), self.match_position)
else:
search_order = xrange(len(self))
bestmatch_i = None
bestmatch_d = None
is_approx = True
for i in search_order:
c = self._colors[i]
if c is self._EMPTY_SLOT_ITEM:
continue
# Closest exact or near-exact match by index distance (according to
# the search_order). Considering near-exact matches as equivalent
# to exact matches improves the feel of PaletteNext and
# PalettePrev.
if exact:
if c == col:
bestmatch_i = i
is_approx = False
break
else:
d = _color_distance(col, c)
if c == col or d < 0.06:
bestmatch_i = i
is_approx = False
break
if bestmatch_d is None or d < bestmatch_d:
bestmatch_i = i
bestmatch_d = d
# Measuring over a blend into solid equiluminant 0-chroma
# grey for the orange #DA5D2E with an opaque but feathered
# brush made huge, and picking just inside the point where the
# palette widget begins to call it approximate:
#
# 0.05 is a difference only discernible (to me) by tilting LCD
# 0.066 to 0.075 appears slightly greyer for large areas
# 0.1 and above is very clearly distinct
# If there are no exact or near-exact matches, choose the most similar
# color anywhere in the palette.
if bestmatch_i is not None:
self._match_position = bestmatch_i
self._match_is_approx = is_approx
self.match_changed()
return True
return False
def _queue_redraw_all_nodes(self):
"""Redraws all nodes on all known view TDWs"""
for i in xrange(len(self.nodes)):
self._queue_draw_node(i)
def update_button_positions(self):
"""Recalculates the positions of the mode's buttons."""
nodes = self._inkmode.nodes
num_nodes = len(nodes)
if num_nodes == 0:
self.reject_button_pos = None
self.accept_button_pos = None
return
button_radius = gui.style.FLOATING_BUTTON_RADIUS
margin = 1.5 * button_radius
alloc = self._tdw.get_allocation()
view_x0, view_y0 = alloc.x, alloc.y
view_x1, view_y1 = (view_x0 + alloc.width), (view_y0 + alloc.height)
# Force-directed layout: "wandering nodes" for the buttons'
# eventual positions, moving around a constellation of "fixed"
# points corresponding to the nodes the user manipulates.
fixed = []
for i, node in enumerate(nodes):
x, y = self._tdw.model_to_display(node.x, node.y)
fixed.append(_LayoutNode(x, y))
# The reject and accept buttons are connected to different nodes
# in the stroke by virtual springs.
stroke_end_i = len(fixed) - 1
stroke_start_i = 0
stroke_last_quarter_i = int(stroke_end_i * 3.0 // 4.0)
assert stroke_last_quarter_i < stroke_end_i
reject_anchor_i = stroke_start_i
accept_anchor_i = stroke_end_i
# Classify the stroke direction as a unit vector
stroke_tail = (
fixed[stroke_end_i].x - fixed[stroke_last_quarter_i].x,
fixed[stroke_end_i].y - fixed[stroke_last_quarter_i].y,
)
stroke_tail_len = math.hypot(*stroke_tail)
if stroke_tail_len <= 0:
stroke_tail = (0., 1.)
else:
stroke_tail = tuple(c / stroke_tail_len for c in stroke_tail)
# Initial positions.
accept_button = _LayoutNode(
fixed[accept_anchor_i].x + stroke_tail[0] * margin,
fixed[accept_anchor_i].y + stroke_tail[1] * margin,
)
reject_button = _LayoutNode(
fixed[reject_anchor_i].x - stroke_tail[0] * margin,
fixed[reject_anchor_i].y - stroke_tail[1] * margin,
)
# Constraint boxes. They mustn't share corners.
# Natural hand strokes are often downwards,
# so let the reject button to go above the accept button.
reject_button_bbox = (
view_x0 + margin, view_x1 - margin,
view_y0 + margin, view_y1 - (2.666 * margin),
)
accept_button_bbox = (
view_x0 + margin, view_x1 - margin,
view_y0 + (2.666 * margin), view_y1 - margin,
)
# Force-update constants
k_repel = -25.0
k_attract = 0.05
# Let the buttons bounce around until they've settled.
for iter_i in xrange(100):
accept_button \
.add_forces_inverse_square(fixed, k=k_repel) \
.add_forces_inverse_square([reject_button], k=k_repel) \
.add_forces_linear([fixed[accept_anchor_i]], k=k_attract)
reject_button \
.add_forces_inverse_square(fixed, k=k_repel) \
.add_forces_inverse_square([accept_button], k=k_repel) \
.add_forces_linear([fixed[reject_anchor_i]], k=k_attract)
reject_button \
.update_position() \
.constrain_position(*reject_button_bbox)
accept_button \
.update_position() \
.constrain_position(*accept_button_bbox)
settled = [(p.speed < 0.5) for p in [accept_button, reject_button]]
if all(settled):
break
self.accept_button_pos = accept_button.x, accept_button.y
self.reject_button_pos = reject_button.x, reject_button.y