2014/10/15 下午 10:04:51

iphone Programming Glossary: c4

where to start with audio synthesis on iPhone

http://stackoverflow.com/questions/2067267/where-to-start-with-audio-synthesis-on-iphone

12 x log2 f 440 E F F# G G# MIDI Note ref http www.phys.unsw.edu.au jw notes.html MIDI Node numbers A3 57 A#3 58 B3 59 C4 60 C#4 61 D4 62 D#4 63 E4 64 F4 65 F#4 66 G4 67 G#4 68 A4 69 A#4 70 B4 71 C5 72 float CalculateFrequencyFromNote SInt32..

C/C++/Obj-C Real-time algorithm to ascertain Note (not Pitch) from Vocal Input

http://stackoverflow.com/questions/4062099/c-c-obj-c-real-time-algorithm-to-ascertain-note-not-pitch-from-vocal-input

Note not Pitch from Vocal Input I want to detect not the pitch but the pitch class of a sung note. So whether it is C4 or C5 is not important they must both be detected as C. Imagine the 12 semitones arranged on a clock face with the needle..

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

on the four control points CGFloat C1 d 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 not needed for this calculation finally it is easy to calculate the slope element using those coefficients return 3.0.. this and the slope calculation CGFloat C1 d 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 it's now easy to calculate the point using those coefficients return C1 t t t C2 t t C3 t C4 @implementation MBBezierView.. C3 3.0 b 3.0 a CGFloat C4 a it's now easy to calculate the point using those coefficients return C1 t t t C2 t t C3 t C4 @implementation MBBezierView void drawRect CGRect rect CGPoint p1 p2 p3 p4 p1 CGPointMake 30 rect.size.height 0.33 p2 CGPointMake..

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

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 3.0 a CGFloat C3 3.0 b 3.0 a CGFloat C4 a return C1 t t t C2 t t C3 t C4 CGFloat bezierTangent CGFloat t CGFloat a CGFloat b CGFloat c CGFloat d CGFloat C1 d 3.0.. C1 d 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 C1 t t t C2 t t C3 t C4 CGFloat bezierTangent 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.. 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 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...