crossing ( p1, p2, q1, q2 )
Returns the location of the intersection of the two lines (p1,p2) and (q1,q2)
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A more complex example: Pappus' theorem:
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In 3d, the behavior is undetermined if the lines do not intersect.
The object crossing is a function closure.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/VectorGraphics.m2:1875:0.