CIGAL Reference Manual, Chapter 3 (Functions): WARP
usage: dst_image = warp(src_image,vec_list)
WARP distorts an image by stretching or shrinking it as though it were on a rubber sheet. The distortion is specified by a list of paired vector positions. The first vector in each pair represents a point on the original image, and the second indicates where that position should be moved to in the new image
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