Initial project import

node_modules/three/examples/jsm/interaction/InteractionManager.js

@@ -0,0 +1,226 @@
+import {
+	Matrix4,
+	Vector3
+} from 'three';
+
+const _pixelToLocal = new Matrix4();
+const _mvp = new Matrix4();
+const _viewport = new Matrix4();
+const _size = new Vector3();
+
+/**
+ * Manages interaction for 3D objects independently of the scene graph.
+ *
+ * For objects with an {@link HTMLTexture}, the manager computes CSS `matrix3d`
+ * transforms each frame so the underlying HTML elements stay aligned with
+ * their meshes. Because the elements are children of the canvas, the browser
+ * dispatches pointer events to them natively.
+ *
+ * ```js
+ * const interactions = new InteractionManager();
+ * interactions.connect( renderer, camera );
+ *
+ * // Objects live anywhere in the scene graph
+ * scene.add( mesh );
+ *
+ * // Register for interaction separately
+ * interactions.add( mesh );
+ *
+ * // In the animation loop
+ * interactions.update();
+ * ```
+ * @three_import import { InteractionManager } from 'three/addons/interaction/InteractionManager.js';
+ */
+class InteractionManager {
+
+	constructor() {
+
+		/**
+		 * The registered interactive objects.
+		 *
+		 * @type {Array<Object3D>}
+		 */
+		this.objects = [];
+
+		/**
+		 * The canvas element.
+		 *
+		 * @type {?HTMLCanvasElement}
+		 * @default null
+		 */
+		this.element = null;
+
+		/**
+		 * The camera used for computing the element transforms.
+		 *
+		 * @type {?Camera}
+		 * @default null
+		 */
+		this.camera = null;
+
+		this._cachedCssW = - 1;
+		this._cachedCssH = - 1;
+
+	}
+
+	/**
+	 * Adds one or more objects to the manager.
+	 *
+	 * @param {...Object3D} objects - The objects to add.
+	 * @return {this}
+	 */
+	add( ...objects ) {
+
+		for ( const object of objects ) {
+
+			if ( this.objects.indexOf( object ) === - 1 ) {
+
+				this.objects.push( object );
+
+			}
+
+		}
+
+		return this;
+
+	}
+
+	/**
+	 * Removes one or more objects from the manager.
+	 *
+	 * @param {...Object3D} objects - The objects to remove.
+	 * @return {this}
+	 */
+	remove( ...objects ) {
+
+		for ( const object of objects ) {
+
+			const index = this.objects.indexOf( object );
+
+			if ( index !== - 1 ) {
+
+				this.objects.splice( index, 1 );
+
+			}
+
+		}
+
+		return this;
+
+	}
+
+	/**
+	 * Stores the renderer and camera needed for computing element transforms.
+	 *
+	 * @param {(WebGPURenderer|WebGLRenderer)} renderer - The renderer.
+	 * @param {Camera} camera - The camera.
+	 */
+	connect( renderer, camera ) {
+
+		this.camera = camera;
+		this.element = renderer.domElement;
+
+	}
+
+	/**
+	 * Updates the element transforms for all registered objects.
+	 * Call this once per frame in the animation loop.
+	 */
+	update() {
+
+		const canvas = this.element;
+		const camera = this.camera;
+
+		if ( canvas === null || camera === null ) return;
+
+		// Viewport: NDC (-1,1) to canvas CSS pixels, Y flipped.
+		// Using CSS pixels (clientWidth/clientHeight) so the resulting matrix
+		// can be applied directly as a CSS transform without DPR conversion.
+
+		const cssW = canvas.clientWidth;
+		const cssH = canvas.clientHeight;
+
+		if ( cssW !== this._cachedCssW || cssH !== this._cachedCssH ) {
+
+			_viewport.set(
+				cssW / 2, 0, 0, cssW / 2,
+				0, - cssH / 2, 0, cssH / 2,
+				0, 0, 1, 0,
+				0, 0, 0, 1
+			);
+
+			this._cachedCssW = cssW;
+			this._cachedCssH = cssH;
+
+		}
+
+		for ( const object of this.objects ) {
+
+			const texture = object.material.map;
+
+			if ( ! texture || ! texture.isHTMLTexture ) continue;
+
+			const element = texture.image;
+
+			if ( ! element ) continue;
+
+			// Position at canvas origin so the CSS matrix3d maps correctly.
+			element.style.position = 'absolute';
+			element.style.left = '0';
+			element.style.top = '0';
+			element.style.transformOrigin = '0 0';
+
+			const elemW = element.offsetWidth;
+			const elemH = element.offsetHeight;
+
+			// Get mesh dimensions from geometry bounding box
+
+			const geometry = object.geometry;
+
+			if ( ! geometry.boundingBox ) geometry.computeBoundingBox();
+
+			geometry.boundingBox.getSize( _size );
+
+			// Map element pixel coords (0,0)-(elemW,elemH) to mesh local coords.
+			// Front face: top-left at (-sizeX/2, sizeY/2, maxZ), bottom-right at (sizeX/2, -sizeY/2, maxZ).
+
+			_pixelToLocal.set(
+				_size.x / elemW, 0, 0, - _size.x / 2,
+				0, - _size.y / elemH, 0, _size.y / 2,
+				0, 0, 1, geometry.boundingBox.max.z,
+				0, 0, 0, 1
+			);
+
+			// Model-View-Projection
+
+			_mvp.multiplyMatrices( camera.projectionMatrix, camera.matrixWorldInverse );
+			_mvp.multiply( object.matrixWorld );
+			_mvp.multiply( _pixelToLocal );
+
+			// Apply viewport
+
+			_mvp.premultiply( _viewport );
+
+			// The browser performs the perspective divide (by w) when applying the matrix3d.
+
+			element.style.transform = 'matrix3d(' + _mvp.elements.join( ',' ) + ')';
+
+		}
+
+	}
+
+	/**
+	 * Disconnects this manager, clearing the renderer and camera references.
+	 */
+	disconnect() {
+
+		this.camera = null;
+		this.element = null;
+		this._cachedCssW = - 1;
+		this._cachedCssH = - 1;
+
+	}
+
+}
+
+export { InteractionManager };