Question

How can I, given two different CGPoints, turn them into an CGRect?

Example:

CGPoint p1 = CGPointMake(0,10);
CGPoint p2 = CGPointMake(10,0);

How can I turn this into a CGRect?

Answer 1

This will take two arbitrary points and give you the CGRect that has them as opposite corners.

CGRect r = CGRectMake(MIN(p1.x, p2.x), 
                      MIN(p1.y, p2.y), 
                      fabs(p1.x - p2.x), 
                      fabs(p1.y - p2.y));

The smaller x value paired with the smaller y value will always be the origin of the rect (first two arguments). The absolute value of the difference between x values will be the width, and between y values the height.