map points from semicircle to rectangle

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Can someone pls advice me how can i map a semi-circle into a rectangle. In other words i want to a part of a 360 degree image (half of it) and convert the points to rectangle image.

really appreciate any help or suggestions on this. is there any algortigm, sample codes or even math formula?

thank you

Posted 12-Apr-10 22:19pm

User 5577301

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CPallini · Answer 1 · 2010-04-12T22:34:00

Solution 1

what about

{x,y}->{sqrt(x*x+y*y), atan2(y,x)}

?
:)

Posted 12-Apr-10 22:34pm

CPallini

Eugen Podsypalnikov · Answer 2 · 2010-04-12T23:07:00

The max possible up-half of the circle
placed on the bottom of the bounding rectangle :) :

void GetCenterAndRadius(const CRect& cRect, // in-parameter
                        CPoint& cpCenter,   // out-parameter
                        int& iRadius)       // out-parameter
{
  cRect.NormalizeRect();
  iRadius = min(cRect.Width() / 2, cRect.Height());
  cpCenter.y = cRect.bottom;
  cpCenter.x = (cRect.right - cRect.left) / 2;
}