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