ArkanoidPlayer -- taken from https://github.com/AlphaGit/random-javascript/blob/90e6540100631e1a3ae590c3bde4a21b74f7abd9/arkanoid-canvas/arkanoid.js

ArkanoidPlayer.js

// ArkanoidPlayer
ArkanoidPlayer.prototype = Object.create(DrawableBlock.prototype);
ArkanoidPlayer.prototype.constructor = DrawableBlock;
function ArkanoidPlayer(drawingContext, color, blockHeight, blockWidth, stageWidth, stageHeight) {
    var self = this;
    self.stageWidth = stageWidth;
    self.stageHeight = stageHeight;
    self.cornerX = 0;
    self.cornerY = 0;
    
    DrawableBlock.call(this, drawingContext, color, (stageWidth - blockWidth)/2, stageHeight - blockHeight * 2, blockWidth, blockHeight);
    self.centerPlayer = function() {
        self.cornerX = (stageWidth - self.width) / 2;
    };
    
    self.centerPlayer();
    return {
        draw: self.draw,
        centerPlayer: self.centerPlayer
    };
}