Masking a shape with an image, and an image with a shape.

C4WorkSpace.m

//
// C4WorkSpace.m
//
// Created by Travis Kirton.
//

#import "C4WorkSpace.h"

@implementation C4WorkSpace {
    C4Shape *circle, *shapeMask;
    C4Image *table, *imageMask;
}

-(void)setup {
    circle = [C4Shape ellipse:CGRectMake(0,0,240,240)];
    circle.lineWidth = 0.0f;
    circle.fillColor = C4BLUE;

    imageMask = [C4Image imageNamed:@"C4Gradient"];
    imageMask.frame = circle.bounds;
    circle.mask = imageMask;
    
    table = [C4Image imageNamed:@"C4Table"];
    table.height = circle.height;
    
    shapeMask = [C4Shape rect:CGRectMake(0, 0, 170, 170)];
    shapeMask.center = CGPointMake(table.width / 2.0f, table.height / 2.0f);
    shapeMask.rotation = QUARTER_PI;
    table.mask = shapeMask;
    
    circle.center = CGPointMake(self.canvas.width / 3.0f, self.canvas.center.y);
    table.center = CGPointMake(self.canvas.width * 2.0f / 3.0f, self.canvas.center.y);
    
    [self.canvas addObjects:@[circle,table]];
}

@end