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Add support for arcs in regions.

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This fixes the circular cutout issue described in #32.  Regions were previously stored as a collection of points, now they are stored as a collection of line and arc primitives.
This commit is contained in:
Hamilton Kibbe 2015-08-09 15:11:13 -04:00
parent d4a8705708
commit cb2fa34e88
4 changed files with 70 additions and 49 deletions
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22
gerber/render/cairo_backend.py
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@ -89,13 +89,25 @@ class GerberCairoContext(GerberContext):
self.ctx.move_to(*end) # ...lame
def _render_region(self, region, color):
points = [tuple(map(mul, point, self.scale)) for point in region.points]
self.ctx.set_source_rgba(*color, alpha=self.alpha)
self.ctx.set_operator(cairo.OPERATOR_OVER if (region.level_polarity == "dark" and not self.invert) else cairo.OPERATOR_CLEAR)
self.ctx.set_operator(cairo.OPERATOR_OVER if (region.level_polarity == "dark" and not self.invert) else cairo.OPERATOR_CLEAR)
self.ctx.set_line_width(0)
self.ctx.move_to(*points[0])
for point in points[1:]:
self.ctx.line_to(*point)
self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)
self.ctx.move_to(*tuple(map(mul, region.primitives[0].start, self.scale)))
for p in region.primitives:
if isinstance(p, Line):
self.ctx.line_to(*tuple(map(mul, p.end, self.scale)))
else:
center = map(mul, p.center, self.scale)
start = map(mul, p.start, self.scale)
end = map(mul, p.end, self.scale)
radius = self.scale[0] * p.radius
angle1 = p.start_angle
angle2 = p.end_angle
if p.direction == 'counterclockwise':
self.ctx.arc(*center, radius=radius, angle1=angle1, angle2=angle2)
else:
self.ctx.arc_negative(*center, radius=radius, angle1=angle1, angle2=angle2)
self.ctx.fill()
def _render_circle(self, circle, color):