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363 lines
8.4 KiB
363 lines
8.4 KiB
<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js - platformer demo</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<style>
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body {
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background-color: rgb(200,200,200);
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margin: 0px;
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overflow: hidden;
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}
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#info {
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position: absolute;
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top: 0px; width: 100%;
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color: #ffffff;
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padding: 5px;
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font-family:Monospace;
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font-size:13px;
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font-weight: bold;
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text-align:center;
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}
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a {
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color: #ffffff;
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}
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</style>
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</head>
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<body>
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<div id="info"><a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - platformer demo. cubemap by <a href="http://www.zfight.com/" target="_blank" rel="noopener">Jochum Skoglund</a>.<br />Use arrow keys to look around, WASD to move and SPACE to jump.</div>
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<script src="../build/three.js"></script>
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<script>
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// player motion parameters
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var motion = {
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airborne: false,
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position: new THREE.Vector3(), velocity: new THREE.Vector3(),
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rotation: new THREE.Vector2(), spinning: new THREE.Vector2()
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};
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motion.position.y = - 150;
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// game systems code
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var resetPlayer = function () {
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if ( motion.position.y < - 123 ) {
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motion.position.set( - 2, 7.7, 25 );
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motion.velocity.multiplyScalar( 0 );
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}
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};
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var keyboardControls = ( function () {
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var keys = { SP: 32, W: 87, A: 65, S: 83, D: 68, UP: 38, LT: 37, DN: 40, RT: 39 };
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var keysPressed = {};
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( function ( watchedKeyCodes ) {
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var handler = function ( down ) {
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return function ( e ) {
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var index = watchedKeyCodes.indexOf( e.keyCode );
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if ( index >= 0 ) {
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keysPressed[ watchedKeyCodes[ index ] ] = down;
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e.preventDefault();
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}
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};
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};
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window.addEventListener( "keydown", handler( true ), false );
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window.addEventListener( "keyup", handler( false ), false );
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} )( [
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keys.SP, keys.W, keys.A, keys.S, keys.D, keys.UP, keys.LT, keys.DN, keys.RT
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] );
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var forward = new THREE.Vector3();
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var sideways = new THREE.Vector3();
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return function () {
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if ( ! motion.airborne ) {
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// look around
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var sx = keysPressed[ keys.UP ] ? 0.03 : ( keysPressed[ keys.DN ] ? - 0.03 : 0 );
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var sy = keysPressed[ keys.LT ] ? 0.03 : ( keysPressed[ keys.RT ] ? - 0.03 : 0 );
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if ( Math.abs( sx ) >= Math.abs( motion.spinning.x ) ) motion.spinning.x = sx;
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if ( Math.abs( sy ) >= Math.abs( motion.spinning.y ) ) motion.spinning.y = sy;
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// move around
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forward.set( Math.sin( motion.rotation.y ), 0, Math.cos( motion.rotation.y ) );
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sideways.set( forward.z, 0, - forward.x );
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forward.multiplyScalar( keysPressed[ keys.W ] ? - 0.1 : ( keysPressed[ keys.S ] ? 0.1 : 0 ) );
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sideways.multiplyScalar( keysPressed[ keys.A ] ? - 0.1 : ( keysPressed[ keys.D ] ? 0.1 : 0 ) );
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var combined = forward.add( sideways );
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if ( Math.abs( combined.x ) >= Math.abs( motion.velocity.x ) ) motion.velocity.x = combined.x;
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if ( Math.abs( combined.y ) >= Math.abs( motion.velocity.y ) ) motion.velocity.y = combined.y;
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if ( Math.abs( combined.z ) >= Math.abs( motion.velocity.z ) ) motion.velocity.z = combined.z;
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//jump
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var vy = keysPressed[ keys.SP ] ? 0.7 : 0;
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motion.velocity.y += vy;
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}
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};
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} )();
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var jumpPads = ( function () {
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var pads = [ new THREE.Vector3( - 17.5, 8, - 10 ), new THREE.Vector3( 17.5, 8, - 10 ), new THREE.Vector3( 0, 8, 21 ) ];
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var temp = new THREE.Vector3();
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return function () {
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if ( ! motion.airborne ) {
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for ( var j = 0, n = pads.length; j < n; j ++ ) {
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if ( pads[ j ].distanceToSquared( motion.position ) < 2.3 ) {
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// calculate velocity towards another side of platform from jump pad position
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temp.copy( pads[ j ] );
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temp.y = 0;
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temp.setLength( - 0.8 );
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temp.y = 0.7;
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motion.airborne = true;
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motion.velocity.copy( temp );
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break;
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}
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}
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}
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};
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} )();
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var applyPhysics = ( function () {
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var timeStep = 5;
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var timeLeft = timeStep + 1;
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var birdsEye = 100;
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var kneeDeep = 0.4;
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var raycaster = new THREE.Raycaster();
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raycaster.ray.direction.set( 0, - 1, 0 );
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var angles = new THREE.Vector2();
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var displacement = new THREE.Vector3();
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return function ( dt ) {
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var platform = scene.getObjectByName( "platform", true );
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if ( platform ) {
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timeLeft += dt;
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// run several fixed-step iterations to approximate varying-step
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dt = 5;
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while ( timeLeft >= dt ) {
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var time = 0.3, damping = 0.93, gravity = 0.01, tau = 2 * Math.PI;
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raycaster.ray.origin.copy( motion.position );
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raycaster.ray.origin.y += birdsEye;
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var hits = raycaster.intersectObject( platform );
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motion.airborne = true;
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// are we above, or at most knee deep in, the platform?
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if ( ( hits.length > 0 ) && ( hits[ 0 ].face.normal.y > 0 ) ) {
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var actualHeight = hits[ 0 ].distance - birdsEye;
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// collision: stick to the surface if landing on it
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if ( ( motion.velocity.y <= 0 ) && ( Math.abs( actualHeight ) < kneeDeep ) ) {
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motion.position.y -= actualHeight;
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motion.velocity.y = 0;
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motion.airborne = false;
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}
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}
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if ( motion.airborne ) motion.velocity.y -= gravity;
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angles.copy( motion.spinning ).multiplyScalar( time );
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if ( ! motion.airborne ) motion.spinning.multiplyScalar( damping );
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displacement.copy( motion.velocity ).multiplyScalar( time );
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if ( ! motion.airborne ) motion.velocity.multiplyScalar( damping );
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motion.rotation.add( angles );
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motion.position.add( displacement );
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// limit the tilt at ±0.4 radians
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motion.rotation.x = Math.max( - 0.4, Math.min( + 0.4, motion.rotation.x ) );
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// wrap horizontal rotation to 0...2π
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motion.rotation.y += tau;
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motion.rotation.y %= tau;
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timeLeft -= dt;
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}
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}
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};
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} )();
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var updateCamera = ( function () {
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var euler = new THREE.Euler( 0, 0, 0, 'YXZ' );
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return function () {
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euler.x = motion.rotation.x;
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euler.y = motion.rotation.y;
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camera.quaternion.setFromEuler( euler );
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camera.position.copy( motion.position );
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camera.position.y += 3.0;
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};
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} )();
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// init 3D stuff
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function makePlatform( url ) {
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var placeholder = new THREE.Object3D();
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var loader = new THREE.ObjectLoader();
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loader.load( url, function ( platform ) {
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placeholder.add( platform );
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} );
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return placeholder;
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}
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var renderer = new THREE.WebGLRenderer( { antialias: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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document.body.appendChild( renderer.domElement );
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var camera = new THREE.PerspectiveCamera( 60, 1, 0.1, 9000 );
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var scene = new THREE.Scene();
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var envMap = new THREE.CubeTextureLoader().load( [
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'textures/cube/skybox/px.jpg', // right
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'textures/cube/skybox/nx.jpg', // left
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'textures/cube/skybox/py.jpg', // top
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'textures/cube/skybox/ny.jpg', // bottom
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'textures/cube/skybox/pz.jpg', // back
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'textures/cube/skybox/nz.jpg' // front
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] );
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envMap.format = THREE.RGBFormat;
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scene.background = envMap;
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scene.add( makePlatform(
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'models/json/platform/platform.json'
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) );
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// start the game
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var start = function ( gameLoop, gameViewportSize ) {
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var resize = function () {
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var viewport = gameViewportSize();
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renderer.setSize( viewport.width, viewport.height );
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camera.aspect = viewport.width / viewport.height;
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camera.updateProjectionMatrix();
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};
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window.addEventListener( 'resize', resize, false );
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resize();
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var lastTimeStamp;
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var render = function ( timeStamp ) {
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var timeElapsed = lastTimeStamp ? timeStamp - lastTimeStamp : 0;
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lastTimeStamp = timeStamp;
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// call our game loop with the time elapsed since last rendering, in ms
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gameLoop( timeElapsed );
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renderer.render( scene, camera );
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requestAnimationFrame( render );
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};
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requestAnimationFrame( render );
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};
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var gameLoop = function ( dt ) {
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resetPlayer();
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keyboardControls();
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jumpPads();
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applyPhysics( dt );
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updateCamera();
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};
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var gameViewportSize = function () {
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return {
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width: window.innerWidth, height: window.innerHeight
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};
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};
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start( gameLoop, gameViewportSize );
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</script>
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</body>
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</html>
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