2014/10/15 下午 10:14:44

iphone Programming Glossary: tangents

Find a point, a given distance, along a simple cubic bezier curve. (On an iPhone!)

http://stackoverflow.com/questions/4058979/find-a-point-a-given-distance-along-a-simple-cubic-bezier-curve-on-an-iphone

points created using curveToPoint controlPoint1 controlPoint2 in your cocoa application How do you find points and the tangents along the curve Later for a complete and simplified solution based on Michal's answer below click to Find the tangent of..

Find the tangent of a point on a cubic bezier curve (on an iPhone)

http://stackoverflow.com/questions/4089443/find-the-tangent-of-a-point-on-a-cubic-bezier-curve-on-an-iphone

Here is a complete answer in code which works and runs It draws approxidistant points along the curve and it draws the tangents. bezierInterpolation finds the points and bezierTangent finds the tangents There is also an alternate version of Michal's.. points along the curve and it draws the tangents. bezierInterpolation finds the points and bezierTangent finds the tangents There is also an alternate version of Michal's answer which is more explanatory . To repeat bezierInterpolation finds the.. bezierInterpolation or altBezierInterpolation for identical results. In both cases use bezierTangent to find the tangents. Finally at the bottom is a code block containing only the two routines you need for the calculation and nothing else. Hope..

How do I detect a touch on a UIBezierPath and move a ball along that?

http://stackoverflow.com/questions/4854035/how-do-i-detect-a-touch-on-a-uibezierpath-and-move-a-ball-along-that

given thickness. After that assuming we are talking about cubics you need to find points and likely velocities a.k.a. tangents along a bezier. Here is the exact total code to do that Find the tangent of a point on a cubic bezier curve on an iPhone.. possible fashion are the two routines to calculate equidistant points in fact approximately equidistant and the tangents of those along a bezier cubic CGFloat bezierPoint CGFloat t CGFloat a CGFloat b CGFloat c CGFloat d CGFloat C1 d 3.0 c 3.0..