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-rw-r--r--gerber/render/cairo_backend.py24
1 files changed, 22 insertions, 2 deletions
diff --git a/gerber/render/cairo_backend.py b/gerber/render/cairo_backend.py
index e6af67f..76be60a 100644
--- a/gerber/render/cairo_backend.py
+++ b/gerber/render/cairo_backend.py
@@ -97,10 +97,29 @@ class GerberCairoContext(GerberContext):
self.dump(filename, verbose)
def render_layers(self, layers, filename, theme=THEMES['default'],
- verbose=False):
+ verbose=False, max_width=800, max_height=600):
""" Render a set of layers
"""
+ # Calculate scale parameter
+ x_range = [10000, -10000]
+ y_range = [10000, -10000]
+ for layer in layers:
+ bounds = layer.bounds
+ if bounds is not None:
+ layer_x, layer_y = bounds
+ x_range[0] = min(x_range[0], layer_x[0])
+ x_range[1] = max(x_range[1], layer_x[1])
+ y_range[0] = min(y_range[0], layer_y[0])
+ y_range[1] = max(y_range[1], layer_y[1])
+ width = x_range[1] - x_range[0]
+ height = y_range[1] - y_range[0]
+
+ scale = math.floor(min(float(max_width)/width, float(max_height)/height))
+ self.scale = (scale, scale)
+
self.clear()
+
+ # Render layers
bgsettings = theme['background']
for layer in layers:
settings = theme.get(layer.layer_class, RenderSettings())
@@ -293,7 +312,7 @@ class GerberCairoContext(GerberContext):
angle2=(2 * math.pi))
mask.ctx.fill()
- if hasattr(circle, 'hole_diameter') and circle.hole_diameter > 0:
+ if hasattr(circle, 'hole_diameter') and circle.hole_diameter is not None and circle.hole_diameter > 0:
mask.ctx.set_operator(cairo.OPERATOR_CLEAR)
mask.ctx.arc(center[0],
center[1],
@@ -303,6 +322,7 @@ class GerberCairoContext(GerberContext):
mask.ctx.fill()
if (hasattr(circle, 'hole_width') and hasattr(circle, 'hole_height')
+ and circle.hole_width is not None and circle.hole_height is not None
and circle.hole_width > 0 and circle.hole_height > 0):
mask.ctx.set_operator(cairo.OPERATOR_CLEAR
if circle.level_polarity == 'dark'