Draws a piechart

@param {String} args The arguments to the command
function PiechartCommand(args) {
    var parsed = new statements.ArgumentStatement(args);

    if (parsed.args.length < 8) throw new SyntaxError('PIECHART command requires 8 arguments');
    this.x = parsed.args[0];
    this.y = parsed.args[1];
    this.r = parsed.args[2];
    this.itemsLength = parsed.args[3];
    this.percentages = parsed.args[4];
    this.itemsRed = parsed.args[5];
    this.itemsGreen = parsed.args[6];
    this.itemsBlue = parsed.args[7];
}