def get_color_at_position(self, x, y, ignore_mask=False):
"""Converts an `x`, `y` position to a colour.
Ordinarily, this implmentation uses any active mask to limit the
colours which can be clicked on. Set `ignore_mask` to disable this
added behaviour.
"""
sup = HueSaturationWheelMixin
if ignore_mask or not self.mask_toggle.get_active():
return sup.get_color_at_position(self, x, y)
voids = self.get_mask_voids()
if not voids:
return sup.get_color_at_position(self, x, y)
isects = []
for vi, void in enumerate(voids):
# If we're inside a void, use the unchanged value
if geom.point_in_convex_poly((x, y), void):
return sup.get_color_at_position(self, x, y)
# If outside, find the nearest point on the nearest void's edge
for p1, p2 in geom.pairwise(void):
isect = geom.nearest_point_in_segment(p1, p2, (x, y))
if isect is not None:
d = math.sqrt((isect[0]-x)**2 + (isect[1]-y)**2)
isects.append((d, isect))
# Above doesn't include segment ends, so add those
d = math.sqrt((p1[0]-x)**2 + (p1[1]-y)**2)
isects.append((d, p1))
# Determine the closest point.
if isects:
isects.sort()
x, y = isects[0][1]
return sup.get_color_at_position(self, x, y)
def get_color_at_position(self, x, y, ignore_mask=False):
"""Converts an `x`, `y` position to a colour.
Ordinarily, this implmentation uses any active mask to limit the
colours which can be clicked on. Set `ignore_mask` to disable this
added behaviour.
"""
sup = HueSaturationWheelMixin
if ignore_mask or not self.mask_toggle.get_active():
return sup.get_color_at_position(self, x, y)
voids = self.get_mask_voids()
if not voids:
return sup.get_color_at_position(self, x, y)
isects = []
for vi, void in enumerate(voids):
# If we're inside a void, use the unchanged value
if geom.point_in_convex_poly((x, y), void):
return sup.get_color_at_position(self, x, y)
# If outside, find the nearest point on the nearest void's edge
for p1, p2 in geom.pairwise(void):
isect = geom.nearest_point_in_segment(p1, p2, (x, y))
if isect is not None:
d = math.sqrt((isect[0] - x)**2 + (isect[1] - y)**2)
isects.append((d, isect))
# Above doesn't include segment ends, so add those
d = math.sqrt((p1[0] - x)**2 + (p1[1] - y)**2)
isects.append((d, p1))
# Determine the closest point.
if isects:
isects.sort()
x, y = isects[0][1]
return sup.get_color_at_position(self, x, y)
def __dist_to_nearest_shape(self, x, y):
# Distance from `x`, `y` to the nearest edge or vertex of any shape.
dists = []
for hull in self.get_mask_voids():
# cx, cy = geom.poly_centroid(hull)
for p1, p2 in geom.pairwise(hull):
np = geom.nearest_point_in_segment(p1, p2, (x, y))
if np is not None:
nx, ny = np
d = math.sqrt((x-nx)**2 + (y-ny)**2)
dists.append(d)
# Segment end too
d = math.sqrt((p1[0]-x)**2 + (p1[1]-y)**2)
dists.append(d)
if not dists:
return None
dists.sort()
return dists[0]
def __dist_to_nearest_shape(self, x, y):
# Distance from `x`, `y` to the nearest edge or vertex of any shape.
dists = []
for hull in self.get_mask_voids():
# cx, cy = geom.poly_centroid(hull)
for p1, p2 in geom.pairwise(hull):
np = geom.nearest_point_in_segment(p1, p2, (x, y))
if np is not None:
nx, ny = np
d = math.sqrt((x - nx)**2 + (y - ny)**2)
dists.append(d)
# Segment end too
d = math.sqrt((p1[0] - x)**2 + (p1[1] - y)**2)
dists.append(d)
if not dists:
return None
dists.sort()
return dists[0]
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 __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)