hw2p helper

threejs 2D template

HTML

<div id="info">THREE.JS 2D Template
    <br/>Left & right click to draw line</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 leftPt, rightPt; // empty array
var p1=[0,0];
var q1=[0,0];
var p2=[0,0];
var q2=[0,0];
var lineA = null;
var lineB = null;
var point;


init();
animate();

function solve (p1x,p1y,p2x,p2y, q1x,q1y,q2x,q2y) {

s = ((q1x-p1x)*(q1y-q2y))/((p2x-p1x)*(q1y-q2y)+(p1y-p2y)*(q1x-q2x))+((q1y-p1y)*(q2x-q1x))/((p2x-p1x)*(q1y-q2y)+(p1y-p2y)*(q1x-q2x));
t = ((p2x-p1x)*(q1y-p1y))/((p2x-p1x)*(q1y-q2y)+(p1y-p2y)*(q1x-q2x))+((p1y-p2y)*(q1x-p1x))/((p2x-p1x)*(q1y-q2y)+(p1y-p2y)*(q1x-q2x));
	return [s, t];
}


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
    });

	 point = new THREE.Mesh (new THREE.CircleGeometry(1), new THREE.MeshBasicMaterial({color:0x00ffff}));
    scene.add (point);
    point.material.visible = false;
    
    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);

    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,...