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