CGPathGetBoundingBox and its younger brother
CGPathGetPathBoundingBox are designed to quickly find a box surrounding a given
CGPath, and they take two distinct approaches to doing so. (If you’re more of a
UIBezierPath person, know that the
bounds property of a path is computed internally using
CGPathGetPathBoundingBox — but you can access the path’s
CGPath property to compute the bounding box using the method provided here instead).
As an example, take the
CGPath formed by the following:
CGMutablePathRef path = CGPathCreateMutable(); CGPathMoveToPoint(path, NULL, 60, 100); CGPathAddQuadCurveToPoint(path, NULL, 170, 30, 280, 100); CGPathAddLineToPoint(path, NULL, 240, 200); CGPathAddCurveToPoint(path, NULL, 140, 240, 120, 240, 20, 200); CGPathCloseSubpath(path);
Which creates the following simple path:
So let’s say we’re trying to find a bounding box for that path.