Dithering Tool OWOP

OWOP.tool.addToolObject(new OWOP.tool.class('(TF)Dithering', OWOP.cursors.erase, OWOP.fx.player.RECT_SELECT_ALIGNED(2), false, function(tool) {
    tool.setEvent('mousemove mousedown', function(mouse, event) {
        var color = mouse.buttons == 1 ? OWOP.player.selectedColor : [255, 255, 255];

        function setChunk() {
            chunkx = Math.floor(mouse.tileX / 2) * 2
            chunky = Math.floor(mouse.tileY / 2) * 2
            for (var x = 0; x < 2; x++) {
                for (var y = 0; y < 2; y++) {
                    OWOP.world.setPixel(chunkx + x + x, chunky + y + y, color)
OWOP.world.setPixel(chunkx + x + y  , chunky + y + x , color)
                }
            }
        }
        switch (mouse.buttons) {
            case 1:
                setChunk()
                break;

            case 2:
                setChunk()
                break;
        }
    });
}));
//took me a bit to figure out F, but its good now