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2014/10/15 ¤U¤È 10:10:32
iphone Programming Glossary: interpolatehow 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 that I would recommend Simple Interpolation You can simply 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.. easy. The only problem might be at the beginning and end of your samples since the first and last sample point aren't interpolated in an open curve. One common work around is to double up your first and last sample point so that you have enough points..
Optimizing a drawing (with finger touches) application for iPhone SDK http://stackoverflow.com/questions/1123306/optimizing-a-drawing-with-finger-touches-application-for-iphone-sdk a smoother path Thanks. iphone uikit drawing quartz graphics share improve this question Another approach is to interpolate the curve between the sample points. When the finger drag starts begin collecting sample points. As the number of points..
http://stackoverflow.com/questions/12257429/how-do-i-modify-a-gpuimagegaussianselectiveblurfilter-to-operate-over-a-rectangl center of the image to the current pixel's coordinate. The last line uses the smoothstep GLSL function to smoothly interpolate between 0 and 1 when the distance from the center point travels between two thresholds the inner clear circle and the outer..
http://stackoverflow.com/questions/18736954/missing-recommended-icon-file-the-bundle-does-not-contain-an-app-icon-for-iph 120 x 120 144 x 144 and 152 x 152 icon sizes. Without counting Spotlight and Settings icon if you don ™t want the OS to interpolate them As per the blog post New Metrics for iOS 7 App Icons . UPDATE As per Apple Guideline App icon OR Icon and Image Sizes..
How do i rotate a CALayer around a diagonal line? http://stackoverflow.com/questions/2394807/how-do-i-rotate-a-calayer-around-a-diagonal-line matrix actually 9 pushing them as keyframes to be shown at each tenth of a second and then using the don't interpolate parameter. you can tweak the animation number for balancing smoothness and performance sorry for possible errors this last..
Animating a custom property of CALayer subclass http://stackoverflow.com/questions/2395382/animating-a-custom-property-of-calayer-subclass key Use the value of myInt in your drawInContext method. Now when you animate myInt Core Animation will interpolate the values for each step of the animation and repeatedly ask the layer to draw itself. If you also want to enable implicit..
How to make a CATransform3dMakeRotation rotate the other way? And chain together http://stackoverflow.com/questions/3799194/how-to-make-a-catransform3dmakerotation-rotate-the-other-way-and-chain-together may be required to get the exact result you need. When you are working with a transform directly Core Animation will interpolate the transform from the current value to the specified transform. It will find the shortest path to get to that transform.. the first not combine the two transforms together. However when using a helper keypath like this Core Animation will interpolate between your starting angle and ending angle so you can reverse direction by changing the sign of the ending angle. It optimizes..
how to create iphone's wobbling icon effect? http://stackoverflow.com/questions/929364/how-to-create-iphones-wobbling-icon-effect CABasicAnimation creates a jitter every time it repeats because it jumps to the from position and doesn't interpolate back. CAKeyframeAnimation seems like the solution except that I can't get it to work. I must be missing something. Here's..
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