testOBB

by SunnyHsu

HTML

<div id="info">OBB(2D)
    <br/> 
    <a href="javascript:random_number();">reset</a>
</div>
<script src="http://cdnjs.cloudflare.com/ajax/libs/three.js/r70/three.min.js"></script>
<script src="https://dl.dropboxusercontent.com/u/3587259/Code/Threejs/OrbitControls.js">
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/numeric/1.2.6/numeric.min.js">
</script>

CSS

#info {
    position: absolute;
    top: 0px;
    width: 100%;
    padding: 10px;
    text-align: center;
    color: #ffff00
}
a {
    color: white;
}
body {
    overflow: hidden;
}

JavaScript

var camera, scene, renderer, geometry, material, light, controls;
var point;
var pointGroup = new THREE.Object3D();
var avr = [], mCen = [], cov = [], localCoor = [], centroid = [], xy = [], 
		size = [], PC1 = [], PC2 = [];
var ev, xMax, xMin, yMax, yMin;

/*
var centroid = [], sum = [0, 0], C = [];
var size = [];
var p1=[], p2 = [], p3 = [], p4 = [];
*/
init();
animate();

function init() {
    scene = new THREE.Scene();

    camera = new THREE.PerspectiveCamera(50, window.innerWidth / window.innerHeight, 1, 1000);
    camera.position.z = 10;
    scene.add(camera);

    var geometry = new THREE.Geometry();
    geometry.vertices.push(
    new THREE.Vector3(-50, -50, 0),
    new THREE.Vector3(50, -50, 0),
    new THREE.Vector3(50, 50, 0),
    new THREE.Vector3(-50, 50, 0),
    new THREE.Vector3(-50, -50, 0));

    var border = new THREE.Line(geometry, new THREE.LineBasicMaterial({
        color: 0x0000ff
    }));
    scene.add(border);
    //加入10個點
    xy = [[2.5,2.4],[0.5,0.7],[2.2,2.9],[1.9,2.2],[3.1,3],[2.3,2.7],
    					[2,1.6],[1,1.1],[1.5,1.6],[1.1,0.9]];
    for (var i = 0; i < 10; i++) {
    		point = new THREE.Mesh(new THREE.CircleGeometry(0.05, 12), new THREE.MeshBasicMaterial());
    		point.position.set(xy[i][0], xy[i][1], 0);
        pointGroup.add(point);
    }
    scene.add(pointGroup);
    
    computeCentroid();
		minusCen();
    calculateCov();
    calculateEigen();
    computeLocalCoordinate();
    for(var i = 0; i < xy.length; i++) {
    		console.log(localCoor[i][0] + " " + localCoor[i][1]);
    }
    findMaxMin();
    console.log(xMax + " " + xMin + " " + yMax + " " + yMin);
    
    light = new THREE.PointLight(0xffffff);
    light.position.set(100, 300, 200);
    scene.add(light);

    renderer = new THREE.WebGLRenderer();
    renderer.setSize(window.innerWidth, window.innerHeight);
    renderer.setClearColor(0x888888);

    controls = new THREE.OrbitControls(camera, renderer.domElement);

   ...