示例#1
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 def square(pts):
     return drectangle(pts, -1, 1, -1, 1)
示例#2
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 def square(pts):
     return drectangle(pts, -1, 1, -1, 1)
示例#3
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 def ell(pts):
     return ddiff(drectangle(pts, -1, 1, -1, 1), drectangle(pts, -2, 0, -2, 0))
示例#4
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 def ell(pts):
     return ddiff(drectangle(pts, -1, 1, -1, 1),
                  drectangle(pts, -2, 0, -2, 0))