def fill(
self,
ctx: cairo.Context,
rng: Generator,
x1: float,
y1: float,
x2: float,
y2: float,
):
with source(ctx, self.stops[-1].to_pattern()):
ctx.fill_preserve()
# Orient the canvas so that our gradient goes straight in direction of +Y.
gradient_angle = angle((x1, y1), (x2, y2)) - (pi / 2)
with translation(ctx, x1, y1), rotation(ctx, gradient_angle), source(
ctx, self.stops[0].to_pattern()):
# We translated and rotated the canvas, so our gradient control
# vector is now from (0, 0) straight up:
grad_control_y = distance((x1, y1), (x2, y2))
# Get a bounding box of what needs to be filled:
start_x, start_y, end_x, end_y = ctx.fill_extents()
ctx.new_path()
for cx, cy, cr in self.pattern.func(
rng,
(start_x, start_y),
(end_x, end_y),
(0, 0),
(0, grad_control_y),
self.dot_radius,
):
ctx.arc(cx, cy, cr, 0, tau)
ctx.fill()
