Expand or shrink irregular polygon
by THavamani[ Edit ] 2013-03-18 11:56:13
coordinate points for a irregular polygon like (x1,y1) ...(x1,y1).
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Solution:
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Simply multiply each coordinate by a fixed value to scale around the origin.
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for each vertex i
result[i].x = input[i].x * scale
result[i].y = input[i].y * scale
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If you want to scale around a different point
<i>translate to origin (subtract the scaling center)
scale by the correct amount (multiply by a constant)
translate from origin (add the scaling center)</i>
