def draw_component(self, g: Graphics, component: Canvas) -> None:
super().draw_component(g, component)
if component.image == Nothing:
return
image = component.image.unwrap()
padding = component.resolve_insets(StyleKeys.Padding).value_or(
Insets(0, 0, 0, 0)) + component.padding
(x, y, w, h) = component.bounds.tuple
bounds = Bounds(x + padding.left, y + padding.top,
max(w - padding.left - padding.right, 0),
max(h - padding.top - padding.bottom, 0))
(iw, ih) = image.size.tuple
(w, h) = bounds.size.tuple
if iw == 0 or ih == 0 or w == 0 or h == 0:
return
(x, y) = bounds.location.tuple
sw = w / iw
sh = h / ih
sx = x / sw
sy = y / sh
g.scale(sw, sh)
g.set_source_surface(image.surface, sx, sy)
g.paint()
class Plot(object):
red = (1., 0., 0.)
green = (0., 1., 0.)
blue = (0., 0., 1.)
yellow = (1., 1., 0.)
cyan = (0., 1., 1.)
magenta = (1., 0., 1.)
def __init__(self, width, height):
from cairocffi import SVGSurface, Context
self.plot_id = next(_debug_generator)
self._surface = SVGSurface("debug_plot-%05d.svg" % self.plot_id, width,
height)
self._ctx = Context(self._surface)
self._ctx.set_source_rgb(0., 0., 0.)
self._ctx.paint()
def line(self, line, color):
ctx = self._ctx
ctx.move_to(line.p1.x, line.p1.y)
ctx.line_to(line.p2.x, line.p2.y)
ctx.set_source_rgb(*color)
ctx.stroke()
def circle(self, center, radius, stroke_color, fill_color=None):
ctx = self._ctx
ctx.new_sub_path()
ctx.arc(center.x, center.y, radius, 0, math.pi * 2)
ctx.set_source_rgb(*stroke_color)
if fill_color:
ctx.stroke_preserve()
ctx.set_source_rgb(*fill_color)
ctx.fill()
else:
ctx.stroke()
def __init__(self, source: BLImage) -> None:
if source is None:
raise ValueError("Argument 'source' is required.")
super().__init__()
(width, height) = source.size
self._size = Dimension(width, height)
self._source = source
pixels = source.pixels[:]
channels = 4
length = width * height
def load_image() -> Iterable[int]:
for i in range(0, length):
offset = i * channels
r = pixels[offset]
g = pixels[offset + 1]
b = pixels[offset + 2]
a = pixels[offset + 3]
yield int(b * 255)
yield int(g * 255)
yield int(r * 255)
yield int(a * 255)
data = bytearray(load_image())
pattern = ImageSurface.create_for_data(data, FORMAT_ARGB32, width,
height)
self._surface = ImageSurface(FORMAT_ARGB32, width, height)
ctx = Graphics(self._surface)
m = Matrix()
m.translate(0, height)
m.scale(1, -1)
ctx.set_matrix(m)
ctx.set_source_surface(pattern)
ctx.paint()
self.surface.flush()
pattern.finish()
def paint_foreground(self, ctx: Context):
if self._image:
sx = self.width / self._image.get_width()
sy = self.height / self._image.get_height()
s = min(sx, sy)
sw = self._image.get_width() * s
sh = self._image.get_height() * s
ctx.scale(s, s)
x = 0
y = 0
if self.alignment == Anchor.TOP_LEFT:
x = 0
y = 0
elif self.alignment == Anchor.TOP_CENTER:
x = (self.width - sw) / 2
y = 0
elif self.alignment == Anchor.TOP_RIGHT:
x = self.width - sw
y = 0
elif self.alignment == Anchor.CENTER_LEFT:
x = 0
y = (self.height - sh) / 2
elif self.alignment == Anchor.CENTER_CENTER:
x = (self.width - sw) / 2
y = (self.height - sh) / 2
elif self.alignment == Anchor.CENTER_RIGHT:
x = (self.width - sw)
y = (self.height - sh) / 2
elif self.alignment == Anchor.BOTTOM_LEFT:
x = 0
y = self.height - sh
elif self.alignment == Anchor.BOTTOM_CENTER:
x = (self.width - sw) / 2
y = self.height - sh
elif self.alignment == Anchor.BOTTOM_RIGHT:
x = self.width - sw
y = self.height - sh
x /= s
y /= s
ctx.set_source_surface(self._image, x, y)
ctx.paint()
else:
ctx.move_to(0, 0)
ctx.line_to(self.size.width, self.size.height)
ctx.stroke()
ctx.move_to(0, self.size.height)
ctx.line_to(self.size.width, 0)
ctx.stroke()
def draw(self, context: cairo.Context, x: float, y: float, fxy: FixXY):
super().draw(context, x, y, fxy)
context.set_source_surface(self.surf, *fxy(x + self.indent, y))
context.paint()
self.surf.finish()
def __draw_ring (self: 'HueSatWheelWidget', cr: cairocffi.Context,
width: int, height: int, center_x: float, center_y: float,
outer: float, inner: float) -> None:
self.__redraw = False
stride = cairocffi.ImageSurface.format_stride_for_width (cairocffi.FORMAT_ARGB32, width)
buf = numpy.empty (int (height * stride), dtype = numpy.uint8)
for y in range (height):
idx = y * width * 4
dy = -(y - center_y)
for x in range (width):
dx = x - center_x
dist = dx * dx + dy * dy
angle = math.atan2 (dy, dx)
if angle < 0:
angle += 2 * numpy.pi
hue = angle / (2 * numpy.pi)
hue_idx = int ((angle + 2 * numpy.pi / 3) / (2 * numpy.pi) * 255)
hue_idx = hue_idx % 256
if dist < ((inner - 1) ** 2) * (1 - self.__hist[255 - hue_idx]) or \
dist > ((outer + 1) ** 2):
buf[idx + 0] = 0
buf[idx + 1] = 0
buf[idx + 2] = 0
buf[idx + 3] = 0
idx += 4
continue
r, g, b = colorsys.hsv_to_rgb (hue, 1.0, 1.0)
a = 255
buf[idx + 0] = int (math.floor (r * 255 + 0.5))
buf[idx + 1] = int (math.floor (g * 255 + 0.5))
buf[idx + 2] = int (math.floor (b * 255 + 0.5))
buf[idx + 3] = a
idx += 4
source = cairocffi.ImageSurface.create_for_data (
memoryview (buf), cairocffi.FORMAT_ARGB32, width, height, stride
)
fg_color = self.get_style_context ().get_color (Gtk.StateFlags.NORMAL)
cr.save ()
cr.set_source_rgba (0, 0, 0, 0)
cr.paint ()
cr.set_source_surface (source, 0, 0)
cr.paint ()
cr.set_line_width (1)
cr.new_path ()
cr.set_source_rgba (*list (fg_color))
cr.arc (center_x, center_y, (self.size - 4) / 2. - self.ring_width,
0, 2 * numpy.pi)
cr.stroke ()
cr.arc (center_x, center_y, (self.size - 2) / 2, 0, 2 * numpy.pi)
cr.stroke ()
cr.arc (center_x, center_y, 5, 0, 2 * numpy.pi)
cr.fill ()
cr.restore ()
