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@@ -0,0 +1,235 @@
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+import {
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+ Matrix4,
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+ Object3D,
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+ Vector2,
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+ Vector3
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+} from 'three';
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+
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+class CSS2DObject extends Object3D {
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+
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+ constructor( element = document.createElement( 'div' ) ) {
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+
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+ super();
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+
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+ this.isCSS2DObject = true;
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+
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+ this.element = element;
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+
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+ this.element.style.position = 'absolute';
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+ this.element.style.userSelect = 'none';
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+
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+ this.element.setAttribute( 'draggable', false );
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+
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+ this.center = new Vector2( 0.5, 0.5 ); // ( 0, 0 ) is the lower left; ( 1, 1 ) is the top right
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+
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+ this.addEventListener( 'removed', function () {
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+
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+ this.traverse( function ( object ) {
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+
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+ if ( object.element instanceof Element && object.element.parentNode !== null ) {
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+
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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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+
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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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+
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+ super.copy( source, recursive );
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+
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+ this.element = source.element.cloneNode( true );
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+
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+ this.center = source.center;
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+
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+ return this;
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+
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+ }
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+
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+}
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+
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+//
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+
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+const _vector = new Vector3();
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+const _viewMatrix = new Matrix4();
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+const _viewProjectionMatrix = new Matrix4();
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+const _a = new Vector3();
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+const _b = new Vector3();
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+
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+class CSS2DRenderer {
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+
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+ constructor( parameters = {} ) {
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+
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+ const _this = this;
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+
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+ let _width, _height;
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+ let _widthHalf, _heightHalf;
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+
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+ const cache = {
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+ objects: new WeakMap()
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+ };
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+
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+ const domElement = parameters.element !== undefined ? parameters.element : document.createElement( 'div' );
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+
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+ domElement.style.overflow = 'hidden';
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+
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+ this.domElement = domElement;
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+
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+ this.getSize = function () {
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+
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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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+ };
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+
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+ this.render = function ( scene, camera ) {
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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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+
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+ _viewMatrix.copy( camera.matrixWorldInverse );
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+ _viewProjectionMatrix.multiplyMatrices( camera.projectionMatrix, _viewMatrix );
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+
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+ renderObject( scene, scene, camera );
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+ zOrder( scene );
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+
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+ };
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+
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+ this.setSize = function ( width, height ) {
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+
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+ _width = width;
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+ _height = height;
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+
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+ _widthHalf = _width / 2;
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+ _heightHalf = _height / 2;
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+
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+ domElement.style.width = width + 'px';
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+ domElement.style.height = height + 'px';
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+
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+ };
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+
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+ function hideObject( object ) {
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+
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+ if ( object.isCSS2DObject ) object.element.style.display = 'none';
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+
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+ for ( let i = 0, l = object.children.length; i < l; i ++ ) {
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+
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+ hideObject( object.children[ i ] );
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+
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+ }
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+
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+ }
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+
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+ function renderObject( object, scene, camera ) {
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+
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+ if ( object.visible === false ) {
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+
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+ hideObject( object );
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+
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+ return;
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+
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+ }
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+
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+ if ( object.isCSS2DObject ) {
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+
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+ _vector.setFromMatrixPosition( object.matrixWorld );
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+ _vector.applyMatrix4( _viewProjectionMatrix );
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+
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+ const visible = ( _vector.z >= - 1 && _vector.z <= 1 ) && ( object.layers.test( camera.layers ) === true );
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+
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+ const element = object.element;
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+ element.style.display = visible === true ? '' : 'none';
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+
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+ if ( visible === true ) {
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+
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+ object.onBeforeRender( _this, scene, camera );
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+
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+ element.style.transform = 'translate(' + ( - 100 * object.center.x ) + '%,' + ( - 100 * object.center.y ) + '%)' + 'translate(' + ( _vector.x * _widthHalf + _widthHalf ) + 'px,' + ( - _vector.y * _heightHalf + _heightHalf ) + 'px)';
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+
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+ if ( element.parentNode !== domElement ) {
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+
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+ domElement.appendChild( element );
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+
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+ }
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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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+
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+ const objectData = {
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+ distanceToCameraSquared: getDistanceToSquared( camera, object )
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+ };
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+
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+ cache.objects.set( object, objectData );
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+
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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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+
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+ renderObject( object.children[ i ], scene, camera );
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+
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+ }
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+
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+ }
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+
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+ function getDistanceToSquared( object1, object2 ) {
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+
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+ _a.setFromMatrixPosition( object1.matrixWorld );
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+ _b.setFromMatrixPosition( object2.matrixWorld );
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+
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+ return _a.distanceToSquared( _b );
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+
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+ }
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+
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+ function filterAndFlatten( scene ) {
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+
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+ const result = [];
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+
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+ scene.traverseVisible( function ( object ) {
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+
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+ if ( object.isCSS2DObject ) result.push( object );
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+
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+ } );
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+
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+ return result;
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+
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+ }
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+
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+ function zOrder( scene ) {
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+
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+ const sorted = filterAndFlatten( scene ).sort( function ( a, b ) {
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+
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+ if ( a.renderOrder !== b.renderOrder ) {
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+
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+ return b.renderOrder - a.renderOrder;
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+
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+ }
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+
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+ const distanceA = cache.objects.get( a ).distanceToCameraSquared;
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+ const distanceB = cache.objects.get( b ).distanceToCameraSquared;
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+
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+ return distanceA - distanceB;
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+
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+ } );
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+
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+ const zMax = sorted.length;
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+
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+ for ( let i = 0, l = sorted.length; i < l; i ++ ) {
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+
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+ sorted[ i ].element.style.zIndex = zMax - i;
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+
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+ }
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+
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+ }
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+
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+ }
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+
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+}
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+
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+export { CSS2DObject, CSS2DRenderer };
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