QuartzCore/CAMediaTimingFunction.m

   1 #import <QuartzCore/CAMediaTimingFunction.h>
   2 #import <Foundation/NSString.h>
   3 #import <Foundation/NSRaise.h>
   4
   5 NSString * const kCAMediaTimingFunctionLinear=@"kCAMediaTimingFunctionLinear";
   6 NSString * const kCAMediaTimingFunctionEaseIn=@"kCAMediaTimingFunctionEaseIn";
   7 NSString * const kCAMediaTimingFunctionEaseOut=@"kCAMediaTimingFunctionEaseOut";
   8 NSString * const kCAMediaTimingFunctionEaseInEaseOut=@"kCAMediaTimingFunctionEaseInEaseOut";
   9 NSString * const kCAMediaTimingFunctionDefault=@"kCAMediaTimingFunctionDefault";
  10
  11 @implementation CAMediaTimingFunction
  12
  13 -initWithControlPoints:(float)c1x :(float)c1y :(float)c2x :(float)c2y {
  14    _c1x=c1x;
  15    _c1y=c1y;
  16    _c2x=c2x;
  17    _c2y=c2y;
  18    return self;
  19 }
  20
  21 +functionWithControlPoints:(float)c1x :(float)c1y :(float)c2x :(float)c2y {
  22    return [[[self alloc] initWithControlPoints:c1x:c1y:c2x:c2y] autorelease];
  23 }
  24
  25 +functionWithName:(NSString *)name {
  26    if([name isEqualToString:kCAMediaTimingFunctionLinear])
  27     return [self functionWithControlPoints:0:0:1:1];
  28    if([name isEqualToString:kCAMediaTimingFunctionEaseIn])
  29     return [self functionWithControlPoints:0.5:0:1:1];
  30    if([name isEqualToString:kCAMediaTimingFunctionEaseOut])
  31     return [self functionWithControlPoints:0:0:0.5:1];
  32    if([name isEqualToString:kCAMediaTimingFunctionEaseInEaseOut])
  33     return [self functionWithControlPoints:0.5:0:0.5:1];
  34    if([name isEqualToString:kCAMediaTimingFunctionDefault])
  35     return [self functionWithControlPoints:0.25:0.1:0.25:1];
  36
  37    return nil;
  38 }
  39
  40 -(void)getControlPointAtIndex:(size_t)index values:(float[2])ptr {
  41
  42    switch(index){
  43
  44     default:
  45     case 0:
  46      ptr[0]=0;
  47      ptr[1]=0;
  48      break;
  49
  50     case 1:
  51      ptr[0]=_c1x;
  52      ptr[1]=_c1y;
  53      break;
  54
  55     case 2:
  56      ptr[0]=_c2x;
  57      ptr[1]=_c2y;
  58      break;
  59
  60     case 3:
  61      ptr[0]=1;
  62      ptr[1]=1;
  63      break;
  64
  65    }
  66 }
  67
  68 @end