flymis/WebRoot/dojojs/src/gfx/matrix.js

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/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.gfx.matrix");

dojo.require("dojo.lang.common");
dojo.require("dojo.math.*");

dojo.gfx.matrix.Matrix2D = function(/* Matrix2D */ arg){
	// summary: a constructor for 2D matrix
	// arg: a matrix-like object
	if(arg){
		if(arg instanceof Array){
			if(arg.length > 0){
				var m = dojo.gfx.matrix.normalize(arg[0]);
				// combine matrices
				for(var i = 1; i < arg.length; ++i){
					var l = m;
					var r = dojo.gfx.matrix.normalize(arg[i]);
					m = new dojo.gfx.matrix.Matrix2D();
					m.xx = l.xx * r.xx + l.xy * r.yx;
					m.xy = l.xx * r.xy + l.xy * r.yy;
					m.yx = l.yx * r.xx + l.yy * r.yx;
					m.yy = l.yx * r.xy + l.yy * r.yy;
					m.dx = l.xx * r.dx + l.xy * r.dy + l.dx;
					m.dy = l.yx * r.dx + l.yy * r.dy + l.dy;
				}
				dojo.mixin(this, m);
			}
		}else{
			dojo.mixin(this, arg);
		}
	}
};

// the default (identity) matrix, which is used to fill in missing values
dojo.extend(dojo.gfx.matrix.Matrix2D, {xx: 1, xy: 0, yx: 0, yy: 1, dx: 0, dy: 0});

dojo.mixin(dojo.gfx.matrix, {
	// summary: class constants, and methods of dojo.gfx.matrix.Matrix2D
	
	// matrix constants
	identity: new dojo.gfx.matrix.Matrix2D(),
	flipX:    new dojo.gfx.matrix.Matrix2D({xx: -1}),
	flipY:    new dojo.gfx.matrix.Matrix2D({yy: -1}),
	flipXY:   new dojo.gfx.matrix.Matrix2D({xx: -1, yy: -1}),
	
	// matrix creators
	translate: function(/* Number||Point */ a, /* Number, optional */ b){
		// summary: forms a translation matrix
		// a: an X coordinate value (a number), or a point object
		// b: an optional Y coordinate value
		return arguments.length > 1 ? new dojo.gfx.matrix.Matrix2D({dx: a, dy: b}) : new dojo.gfx.matrix.Matrix2D({dx: a.x, dy: a.y}); // dojo.gfx.matrix.Matrix2D