Generating pinstripes with JSTalk and Acorn

pinstripes.js

var acorn = [JSTalk application:"Acorn"];

var w = 640;
var h = 960;

var stripeW = 20;
var spaceW = 20;

var foregroundColor = [NSColor redColor];
var backgroundColor = [NSColor blueColor];

var newImage = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:null pixelsWide:w pixelsHigh:h bitsPerSample:8 samplesPerPixel:4 hasAlpha:true isPlanar:false colorSpaceName:NSCalibratedRGBColorSpace bytesPerRow:w * 4 bitsPerPixel:32];

[NSGraphicsContext saveGraphicsState];
[NSGraphicsContext setCurrentContext:[NSGraphicsContext graphicsContextWithBitmapImageRep:newImage]];

[backgroundColor set];
NSRectFill(NSMakeRect(0, 0, w, h));

[foregroundColor set];

for (var x = 0; x < w; x += (stripeW + spaceW)) {
    NSRectFill(NSMakeRect(x, 0, stripeW, h));
}

[NSGraphicsContext restoreGraphicsState];

[[acorn sharedDocumentController] newDocumentWithImageData:[newImage TIFFRepresentation]];