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-rw-r--r--gerber/render/cairo_backend.py87
1 files changed, 50 insertions, 37 deletions
diff --git a/gerber/render/cairo_backend.py b/gerber/render/cairo_backend.py
index fa1aecc..939863b 100644
--- a/gerber/render/cairo_backend.py
+++ b/gerber/render/cairo_backend.py
@@ -16,53 +16,44 @@
# limitations under the License.
from .render import GerberContext
-from operator import mul
+
import cairocffi as cairo
+
+from operator import mul
import math
+import tempfile
from ..primitives import *
-SCALE = 4000.
-
-
class GerberCairoContext(GerberContext):
- def __init__(self, surface=None, size=(10000, 10000)):
+ def __init__(self, scale=300):
GerberContext.__init__(self)
- if surface is None:
- self.surface = cairo.ImageSurface(cairo.FORMAT_ARGB32,
- size[0], size[1])
- else:
- self.surface = surface
+ self.scale = (scale, scale)
+ self.surface = None
+ self.ctx = None
+
+ 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.size = size
- self.ctx.translate(0, self.size[1])
- self.scale = (SCALE,SCALE)
+ self.ctx.set_fill_rule(cairo.FILL_RULE_EVEN_ODD)
self.ctx.scale(1, -1)
- self.apertures = {}
- self.background = False
-
- def set_bounds(self, bounds):
- if not self.background:
- xbounds, ybounds = bounds
- width = SCALE * (xbounds[1] - xbounds[0])
- height = SCALE * (ybounds[1] - ybounds[0])
- self.surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, int(width), int(height))
- self.ctx = cairo.Context(self.surface)
- self.ctx.translate(0, height)
- self.scale = (SCALE,SCALE)
- self.ctx.scale(1, -1)
- self.ctx.rectangle(SCALE * xbounds[0], SCALE * ybounds[0], width, height)
- self.ctx.set_source_rgb(0,0,0)
- self.ctx.fill()
- self.background = True
+ 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)
end = map(mul, line.end, self.scale)
if isinstance(line.aperture, Circle):
- width = line.aperture.diameter if line.aperture.diameter != 0 else 0.001
+ width = line.aperture.diameter
self.ctx.set_source_rgba(*color, alpha=self.alpha)
- self.ctx.set_line_width(width * SCALE)
+ self.ctx.set_operator(cairo.OPERATOR_OVER if (line.level_polarity == "dark" and not self.invert) else cairo.OPERATOR_CLEAR)
+ self.ctx.set_line_width(width * self.scale[0])
self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)
self.ctx.move_to(*start)
self.ctx.line_to(*end)
@@ -70,6 +61,7 @@ class GerberCairoContext(GerberContext):
elif isinstance(line.aperture, Rectangle):
points = [tuple(map(mul, x, self.scale)) for x in line.vertices]
self.ctx.set_source_rgba(*color, alpha=self.alpha)
+ self.ctx.set_operator(cairo.OPERATOR_OVER if (line.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:]:
@@ -80,12 +72,13 @@ class GerberCairoContext(GerberContext):
center = map(mul, arc.center, self.scale)
start = map(mul, arc.start, self.scale)
end = map(mul, arc.end, self.scale)
- radius = SCALE * arc.radius
+ radius = self.scale * arc.radius
angle1 = arc.start_angle
angle2 = arc.end_angle
width = arc.aperture.diameter if arc.aperture.diameter != 0 else 0.001
self.ctx.set_source_rgba(*color, alpha=self.alpha)
- self.ctx.set_line_width(width * SCALE)
+ self.ctx.set_operator(cairo.OPERATOR_OVER if (arc.level_polarity == "dark" and not self.invert)else cairo.OPERATOR_CLEAR)
+ self.ctx.set_line_width(width * self.scale[0])
self.ctx.set_line_cap(cairo.LINE_CAP_ROUND)
self.ctx.move_to(*start) # You actually have to do this...
if arc.direction == 'counterclockwise':
@@ -97,6 +90,7 @@ class GerberCairoContext(GerberContext):
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_line_width(0)
self.ctx.move_to(*points[0])
for point in points[1:]:
@@ -106,14 +100,16 @@ class GerberCairoContext(GerberContext):
def _render_circle(self, circle, color):
center = tuple(map(mul, circle.position, self.scale))
self.ctx.set_source_rgba(*color, alpha=self.alpha)
+ self.ctx.set_operator(cairo.OPERATOR_OVER if (circle.level_polarity == "dark" and not self.invert) else cairo.OPERATOR_CLEAR)
self.ctx.set_line_width(0)
- self.ctx.arc(*center, radius=circle.radius * SCALE, angle1=0, angle2=2 * math.pi)
+ self.ctx.arc(*center, radius=circle.radius * self.scale[0], angle1=0, angle2=2 * math.pi)
self.ctx.fill()
def _render_rectangle(self, rectangle, color):
ll = map(mul, rectangle.lower_left, self.scale)
width, height = tuple(map(mul, (rectangle.width, rectangle.height), map(abs, self.scale)))
self.ctx.set_source_rgba(*color, alpha=self.alpha)
+ self.ctx.set_operator(cairo.OPERATOR_OVER if (rectangle.level_polarity == "dark" and not self.invert) else cairo.OPERATOR_CLEAR)
self.ctx.set_line_width(0)
self.ctx.rectangle(*ll,width=width, height=height)
self.ctx.fill()
@@ -131,10 +127,27 @@ class GerberCairoContext(GerberContext):
self.ctx.set_font_size(200)
self._render_circle(Circle(primitive.position, 0.01), color)
self.ctx.set_source_rgb(*color)
- self.ctx.move_to(*[SCALE * (coord + 0.01) for coord in primitive.position])
+ self.ctx.set_operator(cairo.OPERATOR_OVER if (primitive.level_polarity == "dark" and not self.invert) else cairo.OPERATOR_CLEAR)
+ self.ctx.move_to(*[self.scale[0] * (coord + 0.01) for coord in primitive.position])
self.ctx.scale(1, -1)
self.ctx.show_text(primitive.net_name)
self.ctx.scale(1, -1)
+ def _paint_inverted_layer(self):
+ self.ctx.set_source_rgba(*self.background_color)
+ self.ctx.set_operator(cairo.OPERATOR_OVER)
+ self.ctx.paint()
+ self.ctx.set_operator(cairo.OPERATOR_CLEAR)
+
def dump(self, filename):
- self.surface.write_to_png(filename)
+ is_svg = filename.lower().endswith(".svg")
+
+ if is_svg:
+ self.surface.finish()
+ self.surface_buffer.flush()
+
+ with open(filename, "w") as f:
+ f.write(open(self.surface_buffer.name, "r").read())
+ f.flush()
+ else:
+ self.surface.write_to_png(filename)
generated by cgit (git 2.34.1) at 2024-07-05 09:27:34 +0000