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34 lines
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ReStructuredText
34 lines
1 KiB
ReStructuredText
.. _algebra_performance:
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Performance considerations in algebra mode
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===============================================
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Creating lots of Shapes in a loop means for every step ``fuse`` and ``clean`` will be called.
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In an example like the below, both functions get slower and slower the more objects are
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already fused. Overall it takes on an M1 Mac 4.76 sec.
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.. code-block:: python
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diam = 80
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holes = Sketch()
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r = Rectangle(2, 2)
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for loc in GridLocations(4, 4, 20, 20):
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if loc.position.X**2 + loc.position.Y**2 < (diam / 2 - 1.8) ** 2:
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holes += loc * r
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c = Circle(diam / 2) - holes
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One way to avoid it is to use lazy evaluation for the algebra operations. Just collect all objects and
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then call ``fuse`` (``+``) once with all objects and ``clean`` once. Overall it takes 0.19 sec.
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.. code-block:: python
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r = Rectangle(2, 2)
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holes = [
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loc * r
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for loc in GridLocations(4, 4, 20, 20).locations
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if loc.position.X**2 + loc.position.Y**2 < (diam / 2 - 1.8) ** 2
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]
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c = Circle(diam / 2) - holes
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