Struts example source code file (matrix.js)

This example Struts source code file (matrix.js) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Struts tags/keywords

array, array, d, d, m, m

The Struts matrix.js source code

/*
	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 (arg) {
	if (arg) {
		if (arg instanceof Array) {
			if (arg.length > 0) {
				var m = dojo.gfx.matrix.normalize(arg[0]);
				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);
		}
	}
};
dojo.extend(dojo.gfx.matrix.Matrix2D, {xx:1, xy:0, yx:0, yy:1, dx:0, dy:0});
dojo.mixin(dojo.gfx.matrix, {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}), translate:function (a, b) {
	if (arguments.length > 1) {
		return new dojo.gfx.matrix.Matrix2D({dx:a, dy:b});
	}
	return new dojo.gfx.matrix.Matrix2D({dx:a.x, dy:a.y});
}, scale:function (a, b) {
	if (arguments.length > 1) {
		return new dojo.gfx.matrix.Matrix2D({xx:a, yy:b});
	}
	if (typeof a == "number") {
		return new dojo.gfx.matrix.Matrix2D({xx:a, yy:a});
	}
	return new dojo.gfx.matrix.Matrix2D({xx:a.x, yy:a.y});
}, rotate:function (angle) {
	var c = Math.cos(angle);
	var s = Math.sin(angle);
	return new dojo.gfx.matrix.Matrix2D({xx:c, xy:s, yx:-s, yy:c});
}, rotateg:function (degree) {
	return dojo.gfx.matrix.rotate(dojo.math.degToRad(degree));
}, skewX:function (angle) {
	return new dojo.gfx.matrix.Matrix2D({xy:Math.tan(angle)});
}, skewXg:function (degree) {
	return dojo.gfx.matrix.skewX(dojo.math.degToRad(degree));
}, skewY:function (angle) {
	return new dojo.gfx.matrix.Matrix2D({yx:-Math.tan(angle)});
}, skewYg:function (degree) {
	return dojo.gfx.matrix.skewY(dojo.math.degToRad(degree));
}, normalize:function (matrix) {
	return (matrix instanceof dojo.gfx.matrix.Matrix2D) ? matrix : new dojo.gfx.matrix.Matrix2D(matrix);
}, clone:function (matrix) {
	var obj = new dojo.gfx.matrix.Matrix2D();
	for (var i in matrix) {
		if (typeof (matrix[i]) == "number" && typeof (obj[i]) == "number" && obj[i] != matrix[i]) {
			obj[i] = matrix[i];
		}
	}
	return obj;
}, invert:function (matrix) {
	var m = dojo.gfx.matrix.normalize(matrix);
	var D = m.xx * m.yy - m.xy * m.yx;
	var M = new dojo.gfx.matrix.Matrix2D({xx:m.yy / D, xy:-m.xy / D, yx:-m.yx / D, yy:m.xx / D, dx:(m.yx * m.dy - m.yy * m.dx) / D, dy:(m.xy * m.dx - m.xx * m.dy) / D});
	return M;
}, _multiplyPoint:function (m, x, y) {
	return {x:m.xx * x + m.xy * y + m.dx, y:m.yx * x + m.yy * y + m.dy};
}, multiplyPoint:function (matrix, a, b) {
	var m = dojo.gfx.matrix.normalize(matrix);
	if (typeof a == "number" && typeof b == "number") {
		return dojo.gfx.matrix._multiplyPoint(m, a, b);
	}
	return dojo.gfx.matrix._multiplyPoint(m, a.x, a.y);
}, multiply:function (matrix) {
	var m = dojo.gfx.matrix.normalize(matrix);
	for (var i = 1; i < arguments.length; ++i) {
		var l = m;
		var r = dojo.gfx.matrix.normalize(arguments[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;
	}
	return m;
}, _sandwich:function (m, x, y) {
	return dojo.gfx.matrix.multiply(dojo.gfx.matrix.translate(x, y), m, dojo.gfx.matrix.translate(-x, -y));
}, scaleAt:function (a, b, c, d) {
	switch (arguments.length) {
	  case 4:
		return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.scale(a, b), c, d);
	  case 3:
		if (typeof c == "number") {
			return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.scale(a), b, c);
		}
		return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.scale(a, b), c.x, c.y);
	}
	return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.scale(a), b.x, b.y);
}, rotateAt:function (angle, a, b) {
	if (arguments.length > 2) {
		return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.rotate(angle), a, b);
	}
	return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.rotate(angle), a.x, a.y);
}, rotategAt:function (degree, a, b) {
	if (arguments.length > 2) {
		return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.rotateg(degree), a, b);
	}
	return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.rotateg(degree), a.x, a.y);
}, skewXAt:function (angle, a, b) {
	if (arguments.length > 2) {
		return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.skewX(angle), a, b);
	}
	return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.skewX(angle), a.x, a.y);
}, skewXgAt:function (degree, a, b) {
	if (arguments.length > 2) {
		return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.skewXg(degree), a, b);
	}
	return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.skewXg(degree), a.x, a.y);
}, skewYAt:function (angle, a, b) {
	if (arguments.length > 2) {
		return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.skewY(angle), a, b);
	}
	return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.skewY(angle), a.x, a.y);
}, skewYgAt:function (degree, a, b) {
	if (arguments.length > 2) {
		return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.skewYg(degree), a, b);
	}
	return dojo.gfx.matrix._sandwich(dojo.gfx.matrix.skewYg(degree), a.x, a.y);
}});