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2014/10/15 ¤U¤È 10:12:51

iphone Programming Glossary: precalculated

Using the apple FFT and accelerate Framework

http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework

malloc nOver2 sizeof float A.imagp float malloc nOver2 sizeof float Next it pre calculates everything that can be precalculated. note that if you are doing this in real code you probably want to do this once when the app loads and call the complimentary.. setupReal vDSP_create_fftsetup log2n FFT_RADIX2 It's worth noting that if we set log2n to eg 8 you can throw these precalculated values into any fft function that uses resolution 2^8. So unless you want ultimate memory optimisation just create one set.. resolution you're going to need and use it for everything. Now the actual transforms making use of the stuff we just precalculated vDSP_fft_zrip setupReal A stride log2n FFT_FORWARD At this point A will be containing n 2 complex numbers only the first..

UITableView: scrolling programmatically the content view

http://stackoverflow.com/questions/3457900/uitableview-scrolling-programmatically-the-content-view

it the touchesMoved called many times gives a relative movement of just one pixel each time minY and maxY are the precalculated limit values in order to compute them I calculated the height of all the cells in the table for max and the height of the..

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

3.0 c 3.0 b a CGFloat C2 3.0 c 6.0 b 3.0 a CGFloat C3 3.0 b 3.0 a CGFloat C4 a return 3.0 C1 t t 2.0 C2 t C3 The four precalculated values C1 C2 C3 C4 are sometimes called the coefficients of the bezier. Recall that a b c d are usually called the four..

Setting anchor point for UIView layer

http://stackoverflow.com/questions/4822457/setting-anchor-point-for-uiview-layer

code below nothing happens the view doesn't change position at all. On the other hand if I set the anchor point to a precalculated point I can move the view but then of course it jumps to the precalculated point . How come this doesn't work as expected.. other hand if I set the anchor point to a precalculated point I can move the view but then of course it jumps to the precalculated point . How come this doesn't work as expected Thanks. void touchesMoved NSSet touches withEvent UIEvent event Only support..

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

3.0 c 3.0 b a CGFloat C2 3.0 c 6.0 b 3.0 a CGFloat C3 3.0 b 3.0 a CGFloat C4 a return 3.0 C1 t t 2.0 C2 t C3 The four precalculated values C1 C2 C3 C4 are sometimes called the coefficients of the bezier. Recall that a b c d are usually called the four..

How can I improve the performance of my custom OpenGL ES 2.0 depth texture generation?

http://stackoverflow.com/questions/6051237/how-can-i-improve-the-performance-of-my-custom-opengl-es-2-0-depth-texture-gener

the both the depth texture generation and the overall rendering pipeline in the application. First I re enabled the precalculated sphere depth and lighting texture that I'd used before with little effect only now I use proper lowp precision values when.. uniform lowp sampler2D sphereDepthMap const lowp vec3 stepValues vec3 2.0 1.0 0.0 void main lowp vec2 precalculatedDepthAndAlpha texture2D sphereDepthMap depthLookupCoordinate .ra float inCircleMultiplier step 0.5 precalculatedDepthAndAlpha.g.. vec2 precalculatedDepthAndAlpha texture2D sphereDepthMap depthLookupCoordinate .ra float inCircleMultiplier step 0.5 precalculatedDepthAndAlpha.g float currentDepthValue normalizedDepth adjustedSphereRadius adjustedSphereRadius precalculatedDepthAndAlpha.r..