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216 lines
4.3 KiB
216 lines
4.3 KiB
6 months ago
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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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class CSS2DObject extends Object3D {
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constructor( element = document.createElement( 'div' ) ) {
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super();
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this.isCSS2DObject = true;
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this.element = element;
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this.element.style.position = 'absolute';
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this.element.style.userSelect = 'none';
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this.element.setAttribute( 'draggable', false );
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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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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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this.center = source.center;
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return this;
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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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class CSS2DRenderer {
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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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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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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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if ( scene.matrixWorldAutoUpdate === true ) scene.updateMatrixWorld();
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if ( camera.parent === null && camera.matrixWorldAutoUpdate === true ) camera.updateMatrixWorld();
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_viewMatrix.copy( camera.matrixWorldInverse );
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_viewProjectionMatrix.multiplyMatrices( camera.projectionMatrix, _viewMatrix );
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renderObject( scene, scene, camera );
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zOrder( scene );
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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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};
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function renderObject( object, scene, camera ) {
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if ( object.isCSS2DObject ) {
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_vector.setFromMatrixPosition( object.matrixWorld );
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_vector.applyMatrix4( _viewProjectionMatrix );
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const visible = ( object.visible === true ) && ( _vector.z >= - 1 && _vector.z <= 1 ) && ( 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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const element = object.element;
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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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if ( element.parentNode !== domElement ) {
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domElement.appendChild( element );
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}
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object.onAfterRender( _this, scene, camera );
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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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cache.objects.set( object, objectData );
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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 );
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}
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}
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function getDistanceToSquared( object1, object2 ) {
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_a.setFromMatrixPosition( object1.matrixWorld );
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_b.setFromMatrixPosition( object2.matrixWorld );
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return _a.distanceToSquared( _b );
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}
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function filterAndFlatten( scene ) {
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const result = [];
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scene.traverse( function ( object ) {
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if ( object.isCSS2DObject ) result.push( object );
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} );
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return result;
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}
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function zOrder( scene ) {
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const sorted = filterAndFlatten( scene ).sort( function ( a, b ) {
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if ( a.renderOrder !== b.renderOrder ) {
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return b.renderOrder - a.renderOrder;
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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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return distanceA - distanceB;
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} );
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const zMax = sorted.length;
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for ( let i = 0, l = sorted.length; i < l; i ++ ) {
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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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export { CSS2DObject, CSS2DRenderer };
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