Random Colored Box Grid.sketchplugin

// Generate Random Noise Boxes
// v.01
//
// This command creates a square group of boxes whose colors are randomly selected from three preset colors.
//
// The default settings can be adjusted within the script.
//
// Copyright (c) 2014 Les R. Titze. All rights reserved.
// Twitter: @lrtitze

// USER MODIFIABLE

// Set the number of blocks on a side and their size.
var blockCount = 30;
var blockSize = 10;

// Default colors
var darkColor  = [MSColor colorWithRed:0.2 green:0.0 blue:0.0 alpha:1.0];
var midColor   = [MSColor colorWithRed:0.5 green:0.1 blue:0.1 alpha:1.0];
var lightColor = [MSColor colorWithRed:1.0 green:0.0 blue:0.0 alpha:1.0];

// CODE FOLLOWS

var colorSet = new Array(darkColor, midColor, lightColor);

// Get current "canvas".
var page = [doc currentPage],
    artboard = [[doc currentPage] currentArtboard],
    currentCanvas = artboard ? artboard : page;

// Adding group layer for blocks.
var camoPatternGroup = currentCanvas.addLayerOfType("group");
camoPatternGroup.setName("Camo: " + blockCount + " x " + blockCount);

camoPatternGroup.frame().x = 0;
camoPatternGroup.frame().y = 0;

camoPatternGroup.frame().width = blockSize*blockCount;
camoPatternGroup.frame().height = blockSize*blockCount;

for (var row = 0    ; row < blockCount; row++) {
    for (var col = 0; col < blockCount; col++) {
        var x = col * blockSize;
        var y = row * blockSize;

        function addBlock(color,named) {
            var blockLayer = camoPatternGroup.addLayerOfType("rectangle");

            // Set default style.
            var style = [[blockLayer style] fills];
            var stylePart = style.addNewStylePart();
            stylePart.color = color;
            stylePart.fillType = 0;

            blockLayer.setName( "Type " + named + ": (" + col+","+row+")");

            var blockLayerFrame = blockLayer.frame();

            blockLayerFrame.setX(x);
            blockLayerFrame.setY(y);

            blockLayerFrame.setWidth(blockSize);
            blockLayerFrame.setHeight(blockSize);
        }

        // choose randomly from the colour set
        var ix = Math.floor(Math.random()*3);

        addBlock( colorSet[ix], ix);
    }
}