translation.js-e

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

${{

	Translation = function (centreX, centreY, x, y, items) {
		this.centreX = centreX;
		this.centreY = centreY;
		this.x = x;
		this.y = y;
		this.items = items;
	}

	Translation.prototype = new EdenUI.plugins.Canvas2D.Transform;

	Translation.prototype.transform = function (context) {
		context.translate(this.x - this.centreX, this.y - this.centreY);
	}
	
	Translation.prototype.getCSS = function (scale) {
		var x = (this.x - this.centreX) * scale;
		var y = (this.y - this.centreY) * scale;
		return "translate(" + x + "px, " + y + "px)";
	}

	Translation.prototype.inverse = function (x, y) {
		return new Point(x - (this.x - this.centreX), y - (this.y - this.centreY));
	}

	Translation.prototype.toString = function () {
		return "Translate(" + Eden.edenCodeForValues(this.centreX, this.centreY, this.x, this.y, this.items) + ")";
	}

	Translation.prototype.getEdenCode = Translation.prototype.toString;

}}$;

func Translate {
	${{
		var centreX, centreY, x, y, items;
		var argNum = arguments.length - 1;
		if (argNum == 0) {
			eden.error(new Error("Translate: This function requires at least 2 arguments."), "error");
			return undefined;
		}
		items = arguments[argNum];
		argNum--;
		arg = arguments[argNum];
		if (arg instanceof Point) {
			x = arg.x;
			y = arg.y;
			argNum--;
		} else if (argNum >= 1) {
			y = arg;
			argNum--;
			x = arguments[argNum];
			argNum--;
		}
		if (argNum >= 0) {
			arg = arguments[argNum];
			if (arg instanceof Point) {
				centreX = arg.x;
				centreY = arg.y;
				argNum--;
			} else if (argNum >= 1) {
				centreY = arg;
				argNum--;
				centreX = arguments[argNum];
				argNum--;
			}		
		}
		if (argNum >= 0) {
			eden.error(new Error("Translate: invalid parameters."), "error");
			return undefined;
		}

		if (typeof(x) !== "number") {
			eden.error(new Error("Translate: The destination X coordinate must be a number, not a " + typeof(x)), "error");
			return undefined;
		}
		if (typeof(y) !== "number") {
			eden.error(new Error("Translate: The destination Y coordinate must be a number, not a " + typeof(y)), "error");
			return undefined;
		}
		if (centreX === undefined) {
			centreX = 0;
		}
		if (centreY === undefined) {
			centreY = 0;
		}
		return new Translation(centreX, centreY, x, y, items);
	}}$;
}