index.js

/*
 *	Copyright 2016, Maxime Journaux <journaux.maxime@gmail.com>
 * 	This work is free. You can redistribute it and/or modify it under the
 *	terms of the Do What The Fuck You Want To Public License, Version 2,
 *	as published by Sam Hocevar. 
 *	See http://www.wtfpl.net for more details.
 */


var path = require("path");
var util = require("util");

var ledmatrix = require(path.join(__dirname, "build", "Release", "node-rpi-rgb-led-matrix.node"));
var LedMatrix = ledmatrix.LedMatrix;

LedMatrix.prototype._scroll = LedMatrix.prototype.scroll;
LedMatrix.prototype.scroll = function(params, callback) {
	var startx = params.x >= 0 ? params.x : 0;
	if(startx > this.getWidth()) startx = 0;

	var starty = params.y >= 0 ? params.y : 0;
	if(starty > this.getHeight()) starty = 0;

	var width = params.width >= 0 ? params.width : 0;
	if(width > this.getWidth()) width = this.getWidth();

	var height = params.y >= 0 ? params.height : 0;
	if(height > this.getHeight()) height = this.getHeight();

	var speed = params.speed || 50;
	if(speed <= 0) speed = 50;

	var loop = params.loop || 1;
	if(loop < 0) loop = 1;
	
	var direction = params.direction || LedMatrix.SCROLL_TO_LEFT;
	if(direction != LedMatrix.SCROLL_TO_LEFT && direction != LedMatrix.SCROLL_TO_RIGHT
		&& direction != LedMatrix.SCROLL_TO_TOP && direction != LedMatrix.SCROLL_TO_BOTTOM) {
		direction = LedMatrix.SCROLL_TO_LEFT;
	}

	callback = callback || function(){};

	this._scroll(callback, startx, starty, width, height, direction, speed, loop);
}

LedMatrix.prototype.scroll2Left = function(params, callback) {
	params.direction = LedMatrix.SCROLL_TO_LEFT;
	this.scroll(params, callback);
}

LedMatrix.prototype.scroll2Right = function(params, callback) {
	params.direction = LedMatrix.SCROLL_TO_RIGHT;
	this.scroll(params, callback);
}

LedMatrix.prototype.scroll2Top = function(params, callback) {
	params.direction = LedMatrix.SCROLL_TO_TOP;
	this.scroll(params, callback);
}

LedMatrix.prototype.scroll2Bottom = function(params, callback) {
	params.direction = LedMatrix.SCROLL_TO_BOTTOM;
	this.scroll(params, callback);
}

module.exports = LedMatrix;