图形学
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gw.setTransform(Matrix3 1)
gw.startTriangles()
gw.triangle #([0,0,0], [50,0,0], [50,50,0]) #(red,red,red)
gw.triangle #([0,0,0], [50,50,0], [0,50,0]) #(green,green,green)
gw.endTriangles()
gw.enlargeUpdateRect #whole
gw.updateScreen()