Image swapping example improved.

C4Workspace.m

//
//  C4Workspace.h
//  Examples
//
//  Created by Travis Kirton
//  Modified by Adam Tindale
//

#import "C4Workspace.h"

@implementation C4WorkSpace {
    //define 2 invisible images
    C4Image *i1, *i2;
    //define a pointer to a selected image
    C4Image *visibleImage;
}

-(void)setup {
    i1 = [C4Image imageNamed:@"C4Sky.png"];
    i2 = [C4Image imageNamed:@"C4Table.png"];
    
    visibleImage = i1;
    
    i1.center = i2.center = self.canvas.center;

    [self.canvas addImage:visibleImage];
}

-(void)touchesBegan {
    [self.canvas removeObject:visibleImage];
    
    if (visibleImage == i1)
        visibleImage = i2;
    else    
        visibleImage = i1;
    
    [self.canvas addImage:visibleImage];
}

@end