ShapeMorphMaskMove Shapes morphing with animated masks that move when to where you touch

C4Workspace.m

//
//  C4WorkSpace.m
//  Examples
//
//  Created by Greg Debicki.
//

#import "C4WorkSpace.h"

@implementation C4WorkSpace {
    C4Shape *shape;
    C4Shape *mask1, *mask2;
    int count;
    CGPoint myCenter;
    
}

-(void)setup {
    myCenter = self.canvas.center;
    
    shape = [C4Shape rect:CGRectMake(0, 0, 150, 150)];
    shape.center = myCenter;
    shape.animationDuration = 0.7f;
    shape.userInteractionEnabled = NO;
    [self setupMask];
    shape.mask = mask1;
    [self.canvas addShape:shape];
}

-(void) setupMask {
    mask1 = [C4Shape rect:CGRectMake(0, 0, 600, 20)];
    mask1.center = CGPointMake(shape.width/2, shape.height/2);
    mask1.animationDuration = 3.0f;
    mask1.animationOptions = REPEAT;
    mask1.rotation = TWO_PI;
    
    mask2 = [C4Shape rect:CGRectMake(0, 0, 20, 600)];
    mask2.center = CGPointMake(mask1.width/2, mask1.height/2);
    mask2.animationDuration = 3.2f;
    mask2.animationOptions = REPEAT | AUTOREVERSE;
    mask2.rotation = TWO_PI;
    [mask1 addShape:mask2];
    
}

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    for (UITouch *t in touches) {
        myCenter = [t locationInView:self.canvas];
    }

    if (count < 5){
        count++;
    }
    else {
        count = 0;
    }
    
    switch (count) {
        case 0:
            [self rectango];
            break;
        case 1:
            [self ellipso];
            break;
        case 2:
            [self lino];
            break;
        case 3:
            [self triango];
            break;
        case 4:
            [self polyGone];
            break;
        case 5:
            [self wham];
            break;
            
        default:
            break;
    }
}

-(void) rectango {
    CGRect rect = CGRectMake(0, 0, 150, 150);
    [shape rect:rect];
    shape.center = myCenter;
}

-(void) ellipso {
    CGRect rect = CGRectMake(0, 0, 150, 150);
    [shape ellipse:rect];
    shape.center = myCenter;
}

-(void) lino {
    CGPoint p1[2] = {CGPointMake(0,0),CGPointMake(150,0)};
    [shape line:p1];
    shape.center = myCenter;
}

-(void) triango {
    CGPoint p2[3] = {
        CGPointMake(0,0),
        CGPointMake(150,150),
        CGPointMake(0,150)};
    [shape triangle:p2];
    shape.center = myCenter;
}

-(void) polyGone {
    CGPoint p3[4] = {
        CGPointMake(100,0),
        CGPointMake(250,0),
        CGPointMake(150, 150),
        CGPointMake(0,150)
    };
    [shape polygon:p3 pointCount:4];
    shape.center = myCenter;
}

-(void) wham {
    C4Font *f = [C4Font fontWithName:@"ArialRoundedMTBold" size:100.0f];
    [shape shapeFromString:@"WHAM!" withFont:f];
    shape.center = myCenter;
}

@end