<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN"
"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">

<!--

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

-->
<!-- ====================================================================== -->
<!-- 3D demo                                                                -->
<!--                                                                        -->
<!-- @author tkormann@ilog.fr                                               -->
<!-- @version $Id$ -->
<!-- ====================================================================== -->

<svg xmlns="http://www.w3.org/2000/svg" 
     xmlns:xlink="http://www.w3.org/1999/xlink"
     id="body" width="640" height="480" viewBox="0 0 640 480">

    <script type="text/ecmascript"><![CDATA[

        // constants
        var MAX_FOCAL_DISTANCE = 1100;
        var MIN_FOCAL_DISTANCE = 400;
        var INVISIBLE_FOCAL_DISTANCE = 20;

        var OBJECT_COME = 1;
        var OBJECT_GO = 2;
        var OBJECT_PLAY = 3;

        var _xOrigin = 320;
        var _yOrigin = 240;
        var svgNS = "http://www.w3.org/2000/svg";

        // 3D object collection
        var _objects;
        var _currentObject;

        // starting time for _animationState='OBJECT_PLAY'
        var _time;

        // object definition
        var _points3d;
        var _faces;

        // svg shapes that represent the object
        var _shapes;

        // transformation matrix
        var _matrix = new Array(1, 0, 0, 0,
                                0, 1, 0, 0,
                                0, 0, 1, 0,
                                0, 0, 0, 1);
        var _gElt;

        var _minFocalDistance;
        var _focalDistance;
        var _incFocalDistance = (MAX_FOCAL_DISTANCE - MIN_FOCAL_DISTANCE) / 75;
        var _currentPoints3d;
        var _alpha = 0;
        var _incAlpha = Math.PI*2 / 100;
        var _beta = 33;
        var _incBeta = Math.PI*2 / 117;
        var _gamma = 33;
        var _incGamma = Math.PI*2 / 117;
        var _animationState;

        // Animates the object
        function animate() {
                if (_animationState == OBJECT_COME) {
                        comeObject();
                } else if (_animationState == OBJECT_GO) {
                        goObject();
                } else if (_animationState == OBJECT_PLAY) {
                        playObject();
                }
                animateObject();
        }

        // Makes the current object to come
        function comeObject() {
                if (_focalDistance+_incFocalDistance > MAX_FOCAL_DISTANCE) {
                        _minFocalDistance = MIN_FOCAL_DISTANCE;
                        _animationState = OBJECT_PLAY;
                        _time = new Date();
                }
        }

        // Makes the current object to disapear
        function goObject() {
                if (_focalDistance+_incFocalDistance <= _minFocalDistance) {
                        switchToObject();
                        _animationState = OBJECT_COME;
                }
        }

        // Makes the current object moving for a time
        function playObject() {
                var newTime = new Date();
                if (newTime - _time > 8000) {
                        _animationState = OBJECT_GO;
                        _minFocalDistance = INVISIBLE_FOCAL_DISTANCE;
                }
        }

        // Animates the object
        function animateObject() {
                setToRotate(_matrix, _alpha, _beta, _gamma);
                transformObject(_matrix, _points3d, _currentPoints3d);
                _alpha = (_alpha + _incAlpha) % (Math.PI*2);
                _beta = (_beta + _incBeta) % (Math.PI*2);
                _gamma = (_gamma + _incGamma) % (Math.PI*2);
                for (var i = 0; i < _faces.length; ++i) {
                        buildShape(i);
                }
                _focalDistance += _incFocalDistance;
                if (_focalDistance > MAX_FOCAL_DISTANCE) {
                        _incFocalDistance = -_incFocalDistance;
                } else if (_focalDistance < _minFocalDistance) {
                        _incFocalDistance = -_incFocalDistance;
                }
        }

        // Global initialization
        function startAnimation(evt) {
                var i = 0;
                _objects = new Array();

                var object;

                object = new Array(3);
                object[0] = buildCubePoints();
                object[1] = buildCubeFaces();
                object[2] = buildCubeColors();
                object[3] = buildCubeAnimationDefinition();
                _objects[i++] = object;

                object = new Array(3);
                object[0] = buildTriPoints();
                object[1] = buildTriFaces();
                object[2] = buildTriColors();
                object[3] = buildTriAnimationDefinition();
                _objects[i++] = object;

                object = new Array(3);
                object[0] = buildRectPoints();
                object[1] = buildRectFaces();
                object[2] = buildRectColors();
                object[3] = buildRectAnimationDefinition();
                _objects[i++] = object;

                _gElt = evt.target;

                _focalDistance = INVISIBLE_FOCAL_DISTANCE;
                _minFocalDistance = INVISIBLE_FOCAL_DISTANCE;
                _animationState = OBJECT_COME;

                _currentObject = -1;
                switchToObject();

                // launch animation
                setInterval('animate()', 20);
        }

        // switch object 
        function switchToObject() {
                _currentObject++;
                if (_currentObject == _objects.length) {
                        _currentObject = 0;
                }
                var object = _objects[_currentObject];
                _points3d = object[0];
                _faces = object[1];

                // updates the animation definition
                var defs = object[3];
                _incFocalDistance = defs[0];
                _incAlpha = defs[1];
                _incBeta = defs[2];
                _incGamma = defs[3];

                // copy current object's coordinates to currentPoints3d
                _currentPoints3d = new Array(_points3d.length);
                for (var i = 0; i < _points3d.length; ++i) {
                        var pt3d = _points3d[i];
                        var cPt3d = new Array(3);
                        cPt3d[0] = pt3d[0];
                        cPt3d[1] = pt3d[1];
                        cPt3d[2] = pt3d[2];
                        _currentPoints3d[i] = cPt3d;
                }

                // clean container
                while (_gElt.firstChild != null) {
                        _gElt.removeChild(_gElt.firstChild);
                }

                // build svg shapes
                _shapes = new Array(_faces.length);
                var colors = object[2];
                for (var i = 0; i < _faces.length; ++i) {
                        var e = document.createElementNS(svgNS, "polygon");
                        e.setAttribute("style", "fill:"+colors[i]);
                        _shapes[i] = e;
                        buildShape(i);
                        _gElt.appendChild(e);
                }
        }

        // Builds the shapes according to the current points 3D 
        function buildShape(index) {
                var e = _shapes[index];
                var face = _faces[index];
                var pointsData = "";
                if (!isFaceVisible(index)) {
                        pointsData = "-10 -10"; // hide the shape
                } else {
                        var pt2d = new Array(2);
                        for (var i = 0; i < face.length; ++i) {
                                projectPoint3d(_currentPoints3d[face[i]], pt2d);
                                pointsData += pt2d[0]+" "+pt2d[1]+" ";
                        }
                }
                e.setAttribute("points", pointsData);
        }

        // --------------------------------------------------------------------
        // 2D functions
        // --------------------------------------------------------------------

        // Projects a 3D point on the screen
        function projectPoint3d(srcPt3d, destPt2d) {
                var x = srcPt3d[0];
                var y = srcPt3d[1];
                var z = srcPt3d[2];
                if (z == 0) {
                       z = 1;
                }
                destPt2d[0] = _focalDistance * x / (800-z) + _xOrigin; 
                destPt2d[1] = _focalDistance * y / (800-z) + _yOrigin; 
        }


        // --------------------------------------------------------------------
        // 3D functions
        // --------------------------------------------------------------------

        // Returns true if the face at the specified index is visible
        function isFaceVisible(index) {
                var face = _faces[index];
                var p1 =  _currentPoints3d[face[0]];
                var p2 =  _currentPoints3d[face[1]];
                var p3 =  _currentPoints3d[face[2]];
                return ((p3[0]-p1[0])*(p3[1]-p2[1])-(p3[0]-p2[0])*(p3[1]-p1[1]) > 0);
        }

        // Transforms according to the specified matrix, the specified 3D points
        function transformObject(matrix, points3d, currentPoints3d) {
                for (var i = 0; i < currentPoints3d.length; ++i) {
                      transformPoint3d(matrix, points3d[i], currentPoints3d[i]);
                }
        }

        // Transforms according to the specified matrix, the specified point
        function transformPoint3d(matrix, srcPt3d, destPt3d) {
                var x = srcPt3d[0];
                var y = srcPt3d[1];
                var z = srcPt3d[2];
                destPt3d[0] = x*matrix[0]+y*matrix[1]+z*matrix[2] + matrix[3];
                destPt3d[1] = x*matrix[4]+y*matrix[5]+z*matrix[6] + matrix[7];
                destPt3d[2] = x*matrix[8]+y*matrix[9]+z*matrix[10] + matrix[11];
        }

        // Sets the specified matrix to a rotation matrix
        function setToRotate(matrix, alpha, beta, gamma) {
                // Assuming the angles are in radians
                var c1 = Math.cos(alpha);
                var s1 = Math.sin(alpha);
                var c2 = Math.cos(beta);
                var s2 = Math.sin(beta);
                var c3 = Math.cos(gamma);    
                var s3 = Math.sin(gamma);

                matrix[0] = c1 * c2;
                matrix[1] = s1 * c2;
                matrix[2] = -s2;
                matrix[3] = 0;

                matrix[4] = -(s1 * c3)+(c1 * s2 * s3);
                matrix[5] = (c1*c3) + (s1 * s2 * s3);
                matrix[6] = c2 * s3;
                matrix[7] = 0;

                matrix[8] = (s1 * s3) + (c1 * s2 * c3);
                matrix[9] = -(c1 * s3) + (s1 * s2 * c3);
                matrix[10] = c2*c3;
                matrix[11] = 0;
        }

        // --------------------------------------------------------------------
        // Object collection
        // --------------------------------------------------------------------

        // --- Cube ---

        // Constructs the animation definition
        function buildCubeAnimationDefinition() {
                var defs = new Array();
                defs[0] = (MAX_FOCAL_DISTANCE - MIN_FOCAL_DISTANCE) / 75; // incFocalDistance
                defs[1] = Math.PI*2 / 100; // _incAlpha
                defs[2] = Math.PI*2 / 117; // _incBeta
                defs[3] = 0; // _incGamma
                return defs;
        }

        // Constructs the color palette for the object
        function buildCubeColors() {
                return new Array("#04a", "#025",  // front
                                 "#4a4", "#252",  // back
                                 "#a44", "#522",  // top
                                 "#aa4", "#552",  // bottom
                                 "#a4a", "#525",  // left
                                 "#aaa", "#555"); // right
        }

        // Constructs the points array, anti-clockwise
        function buildCubeFaces() {
                var faces = new Array(12);
                faces[0] = new Array(0, 2, 3); // front
                faces[1] = new Array(0, 3, 1);
                faces[2] = new Array(6, 4, 5); // back
                faces[3] = new Array(6, 5, 7);
                faces[4] = new Array(4, 0, 1); // top
                faces[5] = new Array(4, 1, 5);
                faces[6] = new Array(2, 6, 7); // bottom
                faces[7] = new Array(2, 7, 3);
                faces[8] = new Array(4, 6, 2); // left
                faces[9] = new Array(4, 2, 0);
                faces[10] = new Array(1, 3, 7); // right
                faces[11] = new Array(1, 7, 5);
                return faces;
        }

        // Constructs the points array
        function buildCubePoints() {
                var points3d = new Array(8);

                // front coordinates
                points3d[0] = new Array(-50, -50, -50);  // x,y,z coordinates
                points3d[1] = new Array(50, -50, -50);
                points3d[2] = new Array(-50, 50, -50);
                points3d[3] = new Array(50, 50, -50);

                // back coordinates
                points3d[4] = new Array(-50, -50, 50);
                points3d[5] = new Array(50, -50, 50);
                points3d[6] = new Array(-50, 50, 50);
                points3d[7] = new Array(50, 50, 50);

                return points3d;
        }

        // --- Rect ---

        // Constructs the animation definition
        function buildRectAnimationDefinition() {
                var defs = new Array();
                defs[0] = (MAX_FOCAL_DISTANCE - MIN_FOCAL_DISTANCE) / 100; // incFocalDistance
                defs[1] = Math.PI*2 / 200; // _incAlpha
                defs[2] = Math.PI*2 / 217; // _incBeta
                defs[3] = Math.PI*2 / 128; // _incGamma
                return defs;
        }

        // Constructs the color palette for the object
        function buildRectColors() {
                return new Array("#04a", "#025",  // front
                                 "#4a4", "#252",  // back
                                 "#a44", "#522",  // top
                                 "#aa4", "#552",  // bottom
                                 "#a4a", "#525",  // left
                                 "#aaa", "#555"); // right
        }

        // Constructs the points array, anti-clockwise
        function buildRectFaces() {
                var faces = new Array(12);
                faces[0] = new Array(0, 2, 3); // front
                faces[1] = new Array(0, 3, 1);
                faces[2] = new Array(6, 4, 5); // back
                faces[3] = new Array(6, 5, 7);
                faces[4] = new Array(4, 0, 1); // top
                faces[5] = new Array(4, 1, 5);
                faces[6] = new Array(2, 6, 7); // bottom
                faces[7] = new Array(2, 7, 3);
                faces[8] = new Array(4, 6, 2); // left
                faces[9] = new Array(4, 2, 0);
                faces[10] = new Array(1, 3, 7); // right
                faces[11] = new Array(1, 7, 5);
                return faces;
        }

        // Constructs the points array
        function buildRectPoints() {
                var points3d = new Array(8);

                // front coordinates
                points3d[0] = new Array(-60, -20, -50);  // x,y,z coordinates
                points3d[1] = new Array(60, -20, -50);
                points3d[2] = new Array(-60, 20, -50);
                points3d[3] = new Array(60, 20, -50);

                // back coordinates
                points3d[4] = new Array(-60, -20, 50);
                points3d[5] = new Array(60, -20, 50);
                points3d[6] = new Array(-60, 20, 50);
                points3d[7] = new Array(60, 20, 50);

                return points3d;
        }

        // --- Triangle ---

        // Constructs the animation definition
        function buildTriAnimationDefinition() {
                var defs = new Array();
                defs[0] = (MAX_FOCAL_DISTANCE - MIN_FOCAL_DISTANCE) / 100; // incFocalDistance
                defs[1] = 0; // _incAlpha
                defs[2] = Math.PI*2 / 217; // _incBeta
                defs[3] = Math.PI*2 / 128; // _incGamma
                return defs;
        }

        // Constructs the color palette for the object
        function buildTriColors() {
                return new Array("#0a0", "#a00", "#00a", "#a0a");
        }

        // Constructs the points array, anti-clockwise
        function buildTriFaces() {
                var faces = new Array(4);
                faces[0] = new Array(0, 3, 1);
                faces[1] = new Array(1, 3, 2);
                faces[2] = new Array(1, 2, 0);
                faces[3] = new Array(3, 0, 2);
                return faces;
        }

        // Constructs the points array
        function buildTriPoints() {
                var points3d = new Array(4);

                points3d[0] = new Array(20, 20, 20);  // x,y,z coordinates
                points3d[1] = new Array(50, 50, 100);
                points3d[2] = new Array(100, 20, 20);
                points3d[3] = new Array(50, 100, 20);
                return points3d;
        }

]]></script>

<defs>
        <linearGradient id="grad1">
                <stop offset="0" style="stop-color:blue" />
                <stop offset=".2" style="stop-color:red" />
                <stop offset=".4" style="stop-color:yellow" />
                <stop offset=".6" style="stop-color:green" />
                <stop offset=".8" style="stop-color:cyan" />
                <stop offset="1" style="stop-color:blue" />
        </linearGradient>
</defs>

<rect x="0" y="10%" width="100%" height="80%" style="fill:black" />
<rect x="0" y="0" width="100%" height="10%" style="fill:#004" />
<rect x="0" y="90%" width="100%" height="10%" style="fill:#004" />

<rect x="0" y="10%" width="100%" height="1" style="fill:url(#grad1)" />
<rect x="0" y="90%" width="100%" height="1" style="fill:url(#grad1)" />
<text x="50%" y="40" style="text-anchor:middle; font-family:Impact;font-size:36; fill:white;">Batik 3D</text>
    <g id="container" onload="startAnimation(evt)">

    </g>

    <!-- ============================================================= -->
    <!-- Batik sample mark                                             -->
    <!-- ============================================================= -->
    <use transform="translate(598,447)" width="27" height="28"
         xlink:href="batikLogo.svg#Batik_Squiggle" />

</svg>