2014/10/15 下午 10:14:20

iphone Programming Glossary: spline

how 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

sample the finger location at set intervals and then interpolate the sample points using something like 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.. using something like 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.. samples. To get an idea of how Catmull Rom curves look you can try out this Java applet demonstrating Catmull Rom splines . Fit a curve to your samples A more advance and more difficult approach would be to do a Least Squares approximation to..

How to measure the distance covered by iphone during free fall?

http://stackoverflow.com/questions/1073608/how-to-measure-the-distance-covered-by-iphone-during-free-fall

Drag UIView around Shape Comprised of CGMutablePaths

http://stackoverflow.com/questions/13664615/drag-uiview-around-shape-comprised-of-cgmutablepaths

look like this when we're done So how do we do this Given an arbitrary point finding the nearest point on a Bezier spline is rather complicated. Let's do it by brute force. We'll just make an array of points closely spaced along the path. The..

iMessage Style Receding Keyboard in an iOS App

http://stackoverflow.com/questions/7780753/imessage-style-receding-keyboard-in-an-ios-app

Drawing Smooth Curves - Methods Needed

http://stackoverflow.com/questions/8702696/drawing-smooth-curves-methods-needed

but all I get are jagged ends where they intersect when I just shift the points 1 2 3 4 2 3 4 5. I have heard of spline curves and all the other types. I am quite new to iPhone programming and do not understand how to program it in my quartz.. CGPoint p2 POINT index 1 CGPoint p3 POINT index 2 now add n points starting at p1 dx dy up until 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.. question I just implemented something similar in a project I am working on. My solution was to use a Catmull Rom spline instead of using Bezier splines. These provide a very smooth curve THROUGH a set a points rather then a bezier spline 'around'..