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2014/10/15 ¤U¤Č 10:05:47
iphone Programming Glossary: cubichow can i trace the finger movement on touch for drawing smooth curves? http://stackoverflow.com/questions/1052119/how-can-i-trace-the-finger-movement-on-touch-for-drawing-smooth-curves a Catmull Rom spline. This is easier than it sounds since you can easily convert a Catmull Rom spline into a series of cubic Bezier curves. Here's how. Say you have four consecutive sample points P0 P1 P2 and P3 the cubic Bezier curve that connects.. into a series of cubic Bezier curves. Here's how. Say you have four consecutive sample points P0 P1 P2 and P3 the cubic Bezier curve that connects P1 to P2 is defined by the following control points B0 P1 B1 P1 P2 P0 6 B3 P2 P1 P3 6 B4 P2 This..
Drag UIView around Shape Comprised of CGMutablePaths http://stackoverflow.com/questions/13664615/drag-uiview-around-shape-comprised-of-cgmutablepaths ^ const CGPathElement element Each path element can be a śmove to a śline to a śquadratic curve to a ścurve to which is a cubic curve or a śclose path All of those except close path define a segment endpoint which we pick up with our helper function..
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 a point a given distance along a simple cubic bezier curve. On an iPhone Imagine you have a completely normal four point bezier curve two points and two control points.. Later for a complete and simplified solution based on Michal's answer below click to Find the tangent of a point on a cubic bezier curve on an iPhone . iphone ipad bezier bezier curve share improve this question There's some simple math behind..
What's the correct code to save a CGLayer as a PNG file? http://stackoverflow.com/questions/4064470/whats-the-correct-code-to-save-a-cglayer-as-a-png-file stroked or whatever you wish UIBezierPath d UIBezierPath bezierPathWithOvalInRect CGRectMake x y w h d fill draw cubic and other curves UIBezierPath longPath longPath.lineWidth 42 longPath.lineCapStyle kCGLineCapRound longPath.lineJoinStyle..
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 the tangent of a point on a cubic bezier curve on an iPhone For a cubic bezier curve with the usual four points a b c d ... For a given value t how to most.. the tangent of a point on a cubic bezier curve on an iPhone For a cubic bezier curve with the usual four points a b c d ... For a given value t how to most elegantly find the tangent at that point.. a given value t how to most elegantly find the tangent at that point See Find a point a given distance along a simple cubic bezier curve. On an iPhone for Michal's fabulous code to find the points along a bezier curve. But how to calculate the..
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 to find out if a point or touch was on a path of a 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.. 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 . . I pasted it in below too. You will have to implement your own MCsim or iteration to find where.. 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 b a CGFloat C2 3.0 c 6.0 b..
How to create custom easing function with Core Animation? http://stackoverflow.com/questions/5161465/how-to-create-custom-easing-function-with-core-animation bezier But I'd like to create timing functions that are more complex. Problem is that media timing seems to require a cubic bezier which is not powerful enough to create these effects The code to create the above is simple enough in other frameworks..
Rotate a Sprite on a bezier path with touch - Cocos2D/Box2D http://stackoverflow.com/questions/7494795/rotate-a-sprite-on-a-bezier-path-with-touch-cocos2d-box2d with 8 floats x1 y1 x2 y2 x3 y3 x4 y4. where x1 y1 and x4 y4 are the arc's end points and x2 y2 and x3 y3 are the cubic bezier's control points. @note adapted for xCode by Valentine Konov valentine @konov.su 2013 @return a array of objects.. with 8 floats x1 y1 x2 y2 x3 y3 x4 y4. where x1 y1 and x4 y4 are the arc's end points and x2 y2 and x3 y3 are the cubic bezier's control points. NSArray createSmallArc float r a1 float a1 a2 float a2 Compute all four points for an arc that..
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