2014/10/15 下午 10:14:42

iphone Programming Glossary: t2

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

a scale value going from 1.0 to 0.1 to 1.0 float scale MAX fabs float frames i 2 frames 1 0.1 CGAffineTransform t1 t2 t3 t1 CGAffineTransformMakeRotation angle t2 CGAffineTransformScale t1 scale 1.0f t3 CGAffineTransformRotate t2 angle CATransform3D.. float scale MAX fabs float frames i 2 frames 1 0.1 CGAffineTransform t1 t2 t3 t1 CGAffineTransformMakeRotation angle t2 CGAffineTransformScale t1 scale 1.0f t3 CGAffineTransformRotate t2 angle CATransform3D trans CATransform3DMakeAffineTransform.. t1 t2 t3 t1 CGAffineTransformMakeRotation angle t2 CGAffineTransformScale t1 scale 1.0f t3 CGAffineTransformRotate t2 angle CATransform3D trans CATransform3DMakeAffineTransform t3 values addObject NSValue valueWithCATransform3D trans times..

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

normal four point bezier curve two points and two control points created using curveToPoint controlPoint1 controlPoint2 in your cocoa application How do you find points and the tangents along the curve Later for a complete and simplified solution.. started. #import MBBezierView.h CGFloat bezierInterpolation CGFloat t CGFloat a CGFloat b CGFloat c CGFloat d CGFloat t2 t t CGFloat t3 t2 t return a a 3 t 3 a a t t 3 b t 6 b b 3 t t c 3 c 3 t t2 d t3 @implementation MBBezierView void drawRect.. MBBezierView.h CGFloat bezierInterpolation CGFloat t CGFloat a CGFloat b CGFloat c CGFloat d CGFloat t2 t t CGFloat t3 t2 t return a a 3 t 3 a a t t 3 b t 6 b b 3 t t c 3 c 3 t t2 d t3 @implementation MBBezierView void drawRect CGRect rect CGPoint..

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

d see also below for another way to do this that follows the 'coefficients' idea and is a little clearer CGFloat t2 t t CGFloat t3 t2 t return a a 3 t 3 a a t t 3 b t 6 b b 3 t t c 3 c 3 t t2 d t3 CGFloat bezierTangent CGFloat t CGFloat.. for another way to do this that follows the 'coefficients' idea and is a little clearer CGFloat t2 t t CGFloat t3 t2 t return a a 3 t 3 a a t t 3 b t 6 b b 3 t t c 3 c 3 t t2 d t3 CGFloat bezierTangent CGFloat t CGFloat a CGFloat b CGFloat.. idea and is a little clearer CGFloat t2 t t CGFloat t3 t2 t return a a 3 t 3 a a t t 3 b t 6 b b 3 t t c 3 c 3 t t2 d t3 CGFloat bezierTangent CGFloat t CGFloat a CGFloat b CGFloat c CGFloat d note that abcd are aka x0 x1 x2 x3 the four..