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Fix multiple layer issue in cairo-unification branch (see #33)

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This commit is contained in:
Hamilton Kibbe 2015-07-22 22:13:09 -04:00
parent b3f6ec558c
commit 39726e3936
3 changed files with 14 additions and 11 deletions
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examples/cairo_example.png
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2
gerber/cam.py
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@ -253,8 +253,8 @@ class CamFile(object):
filename : string <optional>
If provided, save the rendered image to `filename`
"""
ctx.set_bounds(self.bounds)
ctx._paint_background()
if ctx.invert:
ctx._paint_inverted_layer()

23
gerber/render/cairo_backend.py
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@ -31,20 +31,21 @@ class GerberCairoContext(GerberContext):
self.scale = (scale, scale)
self.surface = None
self.ctx = None
self.bg = False
def set_bounds(self, bounds):
origin_in_inch = (bounds[0][0], bounds[1][0])
size_in_inch = (abs(bounds[0][1] - bounds[0][0]), abs(bounds[1][1] - bounds[1][0]))
size_in_pixels = map(mul, size_in_inch, self.scale)
self.surface_buffer = tempfile.NamedTemporaryFile()
self.surface = cairo.SVGSurface(self.surface_buffer, size_in_pixels[0], size_in_pixels[1])
self.ctx = cairo.Context(self.surface)
self.ctx.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)
self.ctx.scale(1, -1)
self.ctx.translate(-(origin_in_inch[0] * self.scale[0]), (-origin_in_inch[1]*self.scale[0]) - size_in_pixels[1])
# self.ctx.translate(-(origin_in_inch[0] * self.scale[0]), -origin_in_inch[1]*self.scale[1])
if self.surface is None:
self.surface_buffer = tempfile.NamedTemporaryFile()
self.surface = cairo.SVGSurface(self.surface_buffer, size_in_pixels[0], size_in_pixels[1])
self.ctx = cairo.Context(self.surface)
self.ctx.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)
self.ctx.scale(1, -1)
self.ctx.translate(-(origin_in_inch[0] * self.scale[0]), (-origin_in_inch[1]*self.scale[0]) - size_in_pixels[1])
# self.ctx.translate(-(origin_in_inch[0] * self.scale[0]), -origin_in_inch[1]*self.scale[1])
def _render_line(self, line, color):
start = map(mul, line.start, self.scale)
@ -140,8 +141,10 @@ class GerberCairoContext(GerberContext):
self.ctx.set_operator(cairo.OPERATOR_CLEAR)
def _paint_background(self):
self.ctx.set_source_rgba(*self.background_color)
self.ctx.paint()
if not self.bg:
self.bg = True
self.ctx.set_source_rgba(*self.background_color)
self.ctx.paint()
def dump(self, filename):
is_svg = filename.lower().endswith(".svg")