Advanced Examples randomMovementMask

C4Workspace.m

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

@implementation C4WorkSpace {
    C4Image *img;
    C4Shape *container;
}

-(void)setup {
    [self setupShapes];
    img.backgroundColor = C4BLUE;
    img.mask = container;
    [self.canvas addImage:img];
}

-(void)setupShapes {
    img = [C4Image imageNamed:@"C4Table"];
    img.height = self.canvas.height;
    container = [C4Shape rect:CGRectMake(0, 0, 300, self.canvas.height)];
    container.fillColor = [UIColor clearColor];
    [self addVisibleContainer];
    
    img.center = self.canvas.center;
    container.center = CGPointMake(img.width/2 ,img.height/2);
    for (int i = 0; i < 30; i ++) {
        [self makeStrip];
    }
}

-(void)makeStrip {
    CGFloat h = [C4Math randomIntBetweenA:1 andB:300];
    C4Shape *strip = [C4Shape rect:CGRectMake(0, 0, 300, h)];
    strip.center = CGPointMake(container.width/2 ,container.height/2);
    strip.alpha = 0.3f;
    [container addShape:strip];
    [self runMethod:@"newPlace:" withObject:strip afterDelay:0.0f];
}

-(void)newPlace: (C4Shape *)sender {
    CGFloat time = ([C4Math randomInt:350]/100.0f) + 1.5f;
    sender.animationDuration = time;
    sender.center = CGPointMake(sender.center.x, [C4Math randomInt:container.height]);
    [self runMethod:@"newPlace:" withObject:sender afterDelay:time];
}

-(void)addVisibleContainer {
    C4Shape *visibleContainer = [C4Shape rect:container.frame];
    visibleContainer.center = self.canvas.center;
    visibleContainer.fillColor = [UIColor clearColor];
    visibleContainer.lineWidth = 2.0f;
    visibleContainer.strokeColor = C4GREY;
    [self.canvas addShape:visibleContainer];
}
@end