Lores drawr with cocoa platground

loaresdrawer.m

// Playground - noun: a place where people can play

import Cocoa

var str = "Hello, playground"

let colors = [NSColor.blackColor(),NSColor.blueColor(),NSColor.greenColor(),NSColor.brownColor(),NSColor.cyanColor(),NSColor.yellowColor(),NSColor.magentaColor(),NSColor.orangeColor(),NSColor.purpleColor(),NSColor.whiteColor()];

func clearScreen(screen:NSRect){
    NSColor.blackColor().setFill();
    NSRectFill(screen);
}

func plot(x:Int,y:Int){
    NSRectFill(NSRect(x: 16*x, y: 10*y, width: 16, height: 10))
}

func setColor(index:Int){
    if index < colors.count{
        colors[index].setFill()
    }
}

class Lores:NSView{
    override func drawRect(dirtyRect: NSRect) {
        clearScreen(dirtyRect)
        for i in 1..39{
            for j in 1..39{
                setColor((i+j)%colors.count)
                plot(i, j);
            }
        }
    }
}

//show
Lores(frame: NSRect(x: 0, y: 0, width: 640, height: 400))