CGPoint on quadrilateral plotted on converted rectangle

Asked Aug 24 '21 at 17:55

Active Aug 24 '21 at 17:55

Viewed 71 times

I can't figure out how to do this (i think my math skills are not that great after all..). I have an array of 4 CGPoint objects (A B C D), which is a quadrilateral. On that quadrilateral I have point E.

How can I transform this quadrilateral of 4 CGPoint objects to a rectangle, so I can calculate point E on this rectangle?

I can't use the build in CIPerspectiveCorrection, because I want the raw CGPoint. I try not to use any external libraries, but if I have to, so be it :)

Thanks!

asked Aug 24 '21 at 17:55

Oritm

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How would you determine the length/width of the resulting rectangle? – aheze Aug 24 '21 at 18:00
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This type of transformation is called a homography. That keyword should help you in your research – Alexander Aug 24 '21 at 18:02
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Ah. @Oritm, this looks kind of similar: https://stackoverflow.com/a/12820877/14351818 – aheze Aug 24 '21 at 18:07
@aheze i have the original cgpoints and the bounds of the view where i want to plot point E. – Oritm Aug 24 '21 at 19:17
@aheze Yes, I found that one as well. I will try to reverse the method! – Oritm Aug 24 '21 at 19:18

CGPoint on quadrilateral plotted on converted rectangle

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