330 lines
7.6 KiB
JavaScript
330 lines
7.6 KiB
JavaScript
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import {
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Matrix4,
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Object3D,
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Quaternion,
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Vector3
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} from 'three';
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/**
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* Based on http://www.emagix.net/academic/mscs-project/item/camera-sync-with-css3-and-webgl-threejs
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*/
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const _position = new Vector3();
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const _quaternion = new Quaternion();
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const _scale = new Vector3();
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class CSS3DObject extends Object3D {
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constructor( element = document.createElement( 'div' ) ) {
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super();
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this.isCSS3DObject = true;
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this.element = element;
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this.element.style.position = 'absolute';
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this.element.style.pointerEvents = 'auto';
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this.element.style.userSelect = 'none';
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this.element.setAttribute( 'draggable', false );
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this.addEventListener( 'removed', function () {
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this.traverse( function ( object ) {
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if ( object.element instanceof Element && object.element.parentNode !== null ) {
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object.element.parentNode.removeChild( object.element );
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}
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} );
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} );
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}
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copy( source, recursive ) {
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super.copy( source, recursive );
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this.element = source.element.cloneNode( true );
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return this;
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}
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}
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class CSS3DSprite extends CSS3DObject {
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constructor( element ) {
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super( element );
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this.isCSS3DSprite = true;
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this.rotation2D = 0;
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}
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copy( source, recursive ) {
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super.copy( source, recursive );
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this.rotation2D = source.rotation2D;
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return this;
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}
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}
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//
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const _matrix = new Matrix4();
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const _matrix2 = new Matrix4();
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class CSS3DRenderer {
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constructor( parameters = {} ) {
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const _this = this;
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let _width, _height;
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let _widthHalf, _heightHalf;
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const cache = {
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camera: { style: '' },
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objects: new WeakMap()
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};
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const domElement = parameters.element !== undefined ? parameters.element : document.createElement( 'div' );
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domElement.style.overflow = 'hidden';
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this.domElement = domElement;
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const viewElement = document.createElement( 'div' );
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viewElement.style.transformOrigin = '0 0';
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viewElement.style.pointerEvents = 'none';
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domElement.appendChild( viewElement );
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const cameraElement = document.createElement( 'div' );
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cameraElement.style.transformStyle = 'preserve-3d';
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viewElement.appendChild( cameraElement );
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this.getSize = function () {
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return {
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width: _width,
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height: _height
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};
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};
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this.render = function ( scene, camera ) {
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const fov = camera.projectionMatrix.elements[ 5 ] * _heightHalf;
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if ( camera.view && camera.view.enabled ) {
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// view offset
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viewElement.style.transform = `translate( ${ - camera.view.offsetX * ( _width / camera.view.width ) }px, ${ - camera.view.offsetY * ( _height / camera.view.height ) }px )`;
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// view fullWidth and fullHeight, view width and height
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viewElement.style.transform += `scale( ${ camera.view.fullWidth / camera.view.width }, ${ camera.view.fullHeight / camera.view.height } )`;
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} else {
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viewElement.style.transform = '';
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}
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if ( scene.matrixWorldAutoUpdate === true ) scene.updateMatrixWorld();
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if ( camera.parent === null && camera.matrixWorldAutoUpdate === true ) camera.updateMatrixWorld();
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let tx, ty;
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if ( camera.isOrthographicCamera ) {
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tx = - ( camera.right + camera.left ) / 2;
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ty = ( camera.top + camera.bottom ) / 2;
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}
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const scaleByViewOffset = camera.view && camera.view.enabled ? camera.view.height / camera.view.fullHeight : 1;
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const cameraCSSMatrix = camera.isOrthographicCamera ?
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`scale( ${ scaleByViewOffset } )` + 'scale(' + fov + ')' + 'translate(' + epsilon( tx ) + 'px,' + epsilon( ty ) + 'px)' + getCameraCSSMatrix( camera.matrixWorldInverse ) :
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`scale( ${ scaleByViewOffset } )` + 'translateZ(' + fov + 'px)' + getCameraCSSMatrix( camera.matrixWorldInverse );
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const perspective = camera.isPerspectiveCamera ? 'perspective(' + fov + 'px) ' : '';
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const style = perspective + cameraCSSMatrix +
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'translate(' + _widthHalf + 'px,' + _heightHalf + 'px)';
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if ( cache.camera.style !== style ) {
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cameraElement.style.transform = style;
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cache.camera.style = style;
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}
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renderObject( scene, scene, camera, cameraCSSMatrix );
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};
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this.setSize = function ( width, height ) {
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_width = width;
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_height = height;
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_widthHalf = _width / 2;
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_heightHalf = _height / 2;
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domElement.style.width = width + 'px';
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domElement.style.height = height + 'px';
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viewElement.style.width = width + 'px';
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viewElement.style.height = height + 'px';
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cameraElement.style.width = width + 'px';
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cameraElement.style.height = height + 'px';
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};
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function epsilon( value ) {
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return Math.abs( value ) < 1e-10 ? 0 : value;
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}
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function getCameraCSSMatrix( matrix ) {
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const elements = matrix.elements;
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return 'matrix3d(' +
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epsilon( elements[ 0 ] ) + ',' +
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epsilon( - elements[ 1 ] ) + ',' +
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epsilon( elements[ 2 ] ) + ',' +
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epsilon( elements[ 3 ] ) + ',' +
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epsilon( elements[ 4 ] ) + ',' +
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epsilon( - elements[ 5 ] ) + ',' +
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epsilon( elements[ 6 ] ) + ',' +
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epsilon( elements[ 7 ] ) + ',' +
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epsilon( elements[ 8 ] ) + ',' +
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epsilon( - elements[ 9 ] ) + ',' +
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epsilon( elements[ 10 ] ) + ',' +
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epsilon( elements[ 11 ] ) + ',' +
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epsilon( elements[ 12 ] ) + ',' +
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epsilon( - elements[ 13 ] ) + ',' +
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epsilon( elements[ 14 ] ) + ',' +
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epsilon( elements[ 15 ] ) +
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')';
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}
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function getObjectCSSMatrix( matrix ) {
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const elements = matrix.elements;
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const matrix3d = 'matrix3d(' +
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epsilon( elements[ 0 ] ) + ',' +
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epsilon( elements[ 1 ] ) + ',' +
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epsilon( elements[ 2 ] ) + ',' +
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epsilon( elements[ 3 ] ) + ',' +
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epsilon( - elements[ 4 ] ) + ',' +
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epsilon( - elements[ 5 ] ) + ',' +
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epsilon( - elements[ 6 ] ) + ',' +
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epsilon( - elements[ 7 ] ) + ',' +
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epsilon( elements[ 8 ] ) + ',' +
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epsilon( elements[ 9 ] ) + ',' +
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epsilon( elements[ 10 ] ) + ',' +
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epsilon( elements[ 11 ] ) + ',' +
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epsilon( elements[ 12 ] ) + ',' +
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epsilon( elements[ 13 ] ) + ',' +
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epsilon( elements[ 14 ] ) + ',' +
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epsilon( elements[ 15 ] ) +
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')';
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return 'translate(-50%,-50%)' + matrix3d;
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}
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function renderObject( object, scene, camera, cameraCSSMatrix ) {
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if ( object.isCSS3DObject ) {
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const visible = ( object.visible === true ) && ( object.layers.test( camera.layers ) === true );
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object.element.style.display = ( visible === true ) ? '' : 'none';
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if ( visible === true ) {
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object.onBeforeRender( _this, scene, camera );
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let style;
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if ( object.isCSS3DSprite ) {
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// http://swiftcoder.wordpress.com/2008/11/25/constructing-a-billboard-matrix/
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_matrix.copy( camera.matrixWorldInverse );
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_matrix.transpose();
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if ( object.rotation2D !== 0 ) _matrix.multiply( _matrix2.makeRotationZ( object.rotation2D ) );
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object.matrixWorld.decompose( _position, _quaternion, _scale );
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_matrix.setPosition( _position );
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_matrix.scale( _scale );
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_matrix.elements[ 3 ] = 0;
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_matrix.elements[ 7 ] = 0;
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_matrix.elements[ 11 ] = 0;
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_matrix.elements[ 15 ] = 1;
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style = getObjectCSSMatrix( _matrix );
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} else {
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style = getObjectCSSMatrix( object.matrixWorld );
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}
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const element = object.element;
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const cachedObject = cache.objects.get( object );
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if ( cachedObject === undefined || cachedObject.style !== style ) {
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element.style.transform = style;
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const objectData = { style: style };
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cache.objects.set( object, objectData );
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}
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if ( element.parentNode !== cameraElement ) {
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cameraElement.appendChild( element );
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}
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object.onAfterRender( _this, scene, camera );
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}
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}
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for ( let i = 0, l = object.children.length; i < l; i ++ ) {
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renderObject( object.children[ i ], scene, camera, cameraCSSMatrix );
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}
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}
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}
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}
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export { CSS3DObject, CSS3DSprite, CSS3DRenderer };
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