-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    firstTouch = [touch locationInView:self];

    CGSize mySize = CGSizeMake(5, 5);
    UIGraphicsBeginImageContext(mySize);
    CGContextRef ctx = UIGraphicsGetCurrentContext();

    CGContextBeginPath(ctx);
    CGContextSetRGBFillColor(ctx, 1, 0, 0, 1);
    CGContextAddRect(ctx, CGRectMake(0, 0, 5, 5));
    CGContextFillPath(ctx);

    UIImage *redRect = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    UIImageView *redRectView = [[UIImageView alloc] initWithImage:redRect];
    redRectView.center = CGPointMake(firstTouch.x, firstTouch.y);
    [self addSubview:redRectView];

}