Custom View for cocoa

drawRect.m

- (void)drawRect:(CGRect) rect {
    
    // If you plan to do more drawing later, it's a good idea
    // to save the graphics state before clipping.
    [NSGraphicsContext saveGraphicsState];
    
    long r = random();
    long g = random();
    long b = random();
    NSColor *color = [NSColor colorWithRed: (r * 1.0/(r + g + b)) green: (g * 1.0 / (r + g + b)) blue: (b * 1.0 / (r + g + b)) alpha: 1.0];
    [color set];
    [[self window] setBackgroundColor:color];
    
    NSBezierPath *path = [NSBezierPath bezierPath];
    [path moveToPoint: NSMakePoint(0, rect.size.height)];
    [path lineToPoint: NSMakePoint(0, 0)];
    
    int zeroOne = 0;
    float x, y;
    
    for (int i = 0; i < (int) rect.size.width / 10; i++) {
        if (zeroOne == 1) {
            y = 0;
            zeroOne = 0;
        } else {
            zeroOne = 1;
            y = 10;
        }
        x = 10 * i;
        [path lineToPoint: NSMakePoint(x, y)];
    }
    [path lineToPoint:NSMakePoint(rect.size.width, (zeroOne == 0 ? 10 : 0))];
    [path lineToPoint:NSMakePoint(rect.size.width, rect.size.height)];
    NSShadow * shadow = [[NSShadow alloc] init];
    [shadow setShadowColor:[NSColor grayColor]];
    [shadow setShadowBlurRadius:10.0];
    [shadow set];
    
    [path fill];
    
    [NSGraphicsContext restoreGraphicsState];
}