hw5 helper

threejs 2D template

by SunnyHsu

HTML

<div id="info">Spring (hw4 helper) <br/>
    <a href="javascript:reset();">reset</a>
</div>
<script src="http://cdnjs.cloudflare.com/ajax/libs/three.js/r70/three.min.js"></script>
<!-- the following disable the regular right-button click -->
<script type="text/javascript">
    document.oncontextmenu = function() {
        return false;
    }
</script>

CSS

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

JavaScript

var camera, scene, renderer;
var mouse = new THREE.Vector2();
var cameraLeft = -50,
    cameraRight = 50,
    cameraTop = 50,
    cameraBottom = -50,
    cameraNear = -10,
    cameraFar = 10;
var point;
var pointGroup= new THREE.Object3D();
var xy=[];
//var leftPt, rightPt; // empty array

init();
animate();

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

    camera = new THREE.OrthographicCamera(cameraLeft, cameraRight, cameraTop, cameraBottom, cameraNear, cameraFar);
    camera.position.z = 10;
    scene.add(camera);

    // draw border
    var material = new THREE.LineBasicMaterial({
        color: 0x0000ff
    });

    var geometry = new THREE.Geometry();
    geometry.vertices.push(
    new THREE.Vector3(-40, -40, 0),
    new THREE.Vector3(40, -40, 0),
    new THREE.Vector3(40, 40, 0),
    new THREE.Vector3(-40, 40, 0),
    new THREE.Vector3(-40, -40, 0));

    var border = new THREE.Line(geometry, material);
    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);

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

    document.body.appendChild(renderer.domElement);
    window.addEventListener('resize', onWindowResize, false);
    //window.addEventListener('mousedown', onDocumentMouseDown, false);
}

function onWindowResize() {
    camera.aspect = window.innerWidth / window.innerHeight;
    camera.updateProjectionMatrix();
    renderer.setSize(window.innerWidth, window.innerHeight);
}
/*
function onDocumentMouseDown(event) {
    event.preventDefault();
    // Normalized Device Coordinate (NDC)
    // NDC: [-1,1]x[-1,1]
   ...