Advanced Examples randomMovementSubview

C4Workspace.m

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

@implementation C4WorkSpace {
    C4Shape *bigCircle;
}

-(void)setup {
    [self makeBigCircle];
}

-(void) makeBigCircle {
    bigCircle = [C4Shape ellipse:CGRectMake(0, 0, 600, 600)];
    bigCircle.center = self.canvas.center;
    bigCircle.strokeColor = [UIColor clearColor];
    [self.canvas addShape:bigCircle];
    for (int i = 0; i < 100; i ++) {
        [self makeCircle];
    }
  bigCircle.animationDuration = 7.5f;
    bigCircle.animationOptions = REPEAT;
    bigCircle.rotation += TWO_PI;
}

-(void)makeCircle {
    C4Shape *circle = [C4Shape ellipse:CGRectMake(0, 0, 5, 5)];
    circle.center = CGPointMake(bigCircle.width/2, bigCircle.height/2);
    [bigCircle addShape:circle];
    [self runMethod:@"newPlace:" withObject:circle afterDelay:0.0f];
}

-(void)newPlace: (C4Shape *)sender {
    CGFloat time = ([C4Math randomInt:250]/100.0f) + 1.0f;
    sender.animationDuration = time;
    NSInteger r = [C4Math randomIntBetweenA:100 andB:300];
    CGFloat theta = DegreesToRadians([C4Math randomInt:360]);
    sender.center = CGPointMake(r*[C4Math cos:theta] + (bigCircle.width/2),
                                r*[C4Math sin:theta] + (bigCircle.height/2));
    [self runMethod:@"newPlace:" withObject:sender afterDelay:time];
}

@end