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2014/10/15 ¤U¤È 10:15:07
iphone Programming Glossary: tttDrawing Smooth Curves - Methods Needed http://stackoverflow.com/questions/8702696/drawing-smooth-curves-methods-needed p2 using Catmull Rom splines for int i 1 i granularity i float t float i 1.0f float granularity float tt t t float ttt tt t CGPoint pi intermediate point pi.x 0.5 2 p1.x p2.x p0.x t 2 p0.x 5 p1.x 4 p2.x p3.x tt 3 p1.x p0.x 3 p2.x p3.x ttt.. tt t CGPoint pi intermediate point pi.x 0.5 2 p1.x p2.x p0.x t 2 p0.x 5 p1.x 4 p2.x p3.x tt 3 p1.x p0.x 3 p2.x p3.x ttt pi.y 0.5 2 p1.y p2.y p0.y t 2 p0.y 5 p1.y 4 p2.y p3.y tt 3 p1.y p0.y 3 p2.y p3.y ttt smoothedPath addLineToPoint pi Now.. p3.x tt 3 p1.x p0.x 3 p2.x p3.x ttt pi.y 0.5 2 p1.y p2.y p0.y t 2 p0.y 5 p1.y 4 p2.y p3.y tt 3 p1.y p0.y 3 p2.y p3.y ttt smoothedPath addLineToPoint pi Now add p2 smoothedPath addLineToPoint p2 finish by adding the last point smoothedPath..
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