lineargradient.js-e

## Copyright (c) 2015, Empirical Modelling Group
## All rights reserved.
##
## See LICENSE.txt

##Example:
/**
 * Creates a LinearGradient that can be used to colour shapes
 * @param x1 X-coordinate for start
 * @param y1 Y-coordinate for start
 * @param x2 X-coordinate for end
 * @param y2 Y-coordinate for end
 * @param [start_colour Start Colour
 * @param end_colour] End Colour
 * @param [extra_colour_stops] A list of two item lists.  The first element of each is a point along the gradient (0.0-1.0).  The second is the colour.
 * 
 * Usage example: 
 * 
 * ```
 * 	x = 50;
 * 	y = 50;
 * 	width = 400;
 * 	height = 250;
 * 	gradient is LinearGradient(x, y, x + width, y + height, "cyan", "blue");
 * 	rect is Rectangle(x, y, width, height, gradient);
 * 	picture is [rect];
 * ```
 * #canvas #colour #gradient #lineargradient
*/

func LinearGradient {
	${{
		var x1 = arguments[0];
		var y1 = arguments[1];
		var x2 = arguments[2];
		var y2 = arguments[3];
		var colourStops;
		if (Array.isArray(arguments[4])) {
			colourStops = arguments[4];
		} else {
			if (Array.isArray(arguments[6])) {
				colourStops = arguments[6];
			} else {
				colourStops = [];
			}
			
			var start_colour = arguments[4];
			if (typeof(start_colour) != "string") {
				start_colour = "black";
			}
			
			var end_colour = arguments[5];
			if (typeof(end_colour) != "string") {
				end_colour = "white";
			}
			
			colourStops.push([0, start_colour]);
			colourStops.push([1, end_colour]);
		}
		return new LinearGradient(x1, y1, x2, y2, colourStops);
	}}$;
}

${{
	LinearGradient = function(x1, y1, x2, y2, colourStops) {
		this.x1 = x1;
		this.y1 = y1;
		this.x2 = x2;
		this.y2 = y2;
		this.colourStops = colourStops;
	}
	
	LinearGradient.prototype = new EdenUI.plugins.Canvas2D.FillStyle();
	
	LinearGradient.prototype.getColour = function (context) {
		var gradient = context.createLinearGradient(this.x1, this.y1, this.x2, this.y2);
		var colourStop;
		for (var i = 0; i < this.colourStops.length; i++) {
			colourStop = this.colourStops[i];
			gradient.addColorStop(colourStop[0], colourStop[1]);
		}
		return gradient;
	};

	LinearGradient.prototype.toString = function() {
		return "LinearGradient(" + Eden.edenCodeForValues(this.x1, this.y1, this.x2, this.y2, this.colourStops) + ")";
		
	};

	LinearGradient.prototype.getEdenCode = LinearGradient.prototype.toString;

}}$;