darling-cocotron/QuartzCore/CAMediaTimingFunction.m

#import <Foundation/NSRaise.h>
#import <Foundation/NSString.h>
#import <QuartzCore/CAMediaTimingFunction.h>

NSString *const kCAMediaTimingFunctionLinear = @"kCAMediaTimingFunctionLinear";
NSString *const kCAMediaTimingFunctionEaseIn = @"kCAMediaTimingFunctionEaseIn";
NSString *const kCAMediaTimingFunctionEaseOut =
        @"kCAMediaTimingFunctionEaseOut";
NSString *const kCAMediaTimingFunctionEaseInEaseOut =
        @"kCAMediaTimingFunctionEaseInEaseOut";
NSString *const kCAMediaTimingFunctionDefault =
        @"kCAMediaTimingFunctionDefault";

@implementation CAMediaTimingFunction

- initWithControlPoints: (CGFloat)
                    c1x: (CGFloat) c1y
                       :(CGFloat) c2x
                       :(CGFloat) c2y
{
    _c1x = c1x;
    _c1y = c1y;
    _c2x = c2x;
    _c2y = c2y;
    return self;
}

+ functionWithControlPoints: (CGFloat)
                        c1x: (CGFloat) c1y
                           :(CGFloat) c2x
                           :(CGFloat) c2y
{
    return [[[self alloc] initWithControlPoints: c1x: c1y:c2x:c2y] autorelease];
}

+ functionWithName: (NSString *) name {
    if ([name isEqualToString: kCAMediaTimingFunctionLinear])
        return [self functionWithControlPoints: 0: 0:1:1];
    if ([name isEqualToString: kCAMediaTimingFunctionEaseIn])
        return [self functionWithControlPoints: 0.5: 0:1:1];
    if ([name isEqualToString: kCAMediaTimingFunctionEaseOut])
        return [self functionWithControlPoints: 0: 0:0.5:1];
    if ([name isEqualToString: kCAMediaTimingFunctionEaseInEaseOut])
        return [self functionWithControlPoints: 0.5: 0:0.5:1];
    if ([name isEqualToString: kCAMediaTimingFunctionDefault])
        return [self functionWithControlPoints: 0.25: 0.1:0.25:1];

    return nil;
}

- (void) getControlPointAtIndex: (size_t) index values: (CGFloat[2]) ptr {

    switch (index) {

    default:
    case 0:
        ptr[0] = 0;
        ptr[1] = 0;
        break;

    case 1:
        ptr[0] = _c1x;
        ptr[1] = _c1y;
        break;

    case 2:
        ptr[0] = _c2x;
        ptr[1] = _c2y;
        break;

    case 3:
        ptr[0] = 1;
        ptr[1] = 1;
        break;
    }
}

@end