potree-sdk/src/utils/ClippingTool.js

import * as THREE from "../../libs/three.js/build/three.module.js";
import {ClipVolume} from "./ClipVolume.js";
import {PolygonClipVolume} from "./PolygonClipVolume.js";
import { EventDispatcher } from "../EventDispatcher.js";
//这个文件只是clipping polygon的，没用到
export class ClippingTool extends EventDispatcher{

	constructor(viewer){
		super(); 

		this.viewer = viewer;

		this.maxPolygonVertices = 8; 
		
		this.addEventListener("start_inserting_clipping_volume", e => {
			this.viewer.dispatchEvent({
				type: "cancel_insertions"
			});
		});

		this.sceneMarker = new THREE.Scene();
		this.sceneVolume = new THREE.Scene();
		this.sceneVolume.name = "scene_clip_volume";
		this.viewer.inputHandler.registerInteractiveScene(this.sceneVolume);

		this.onRemove = e => {
			this.sceneVolume.remove(e.volume);
		};
		
		this.onAdd = e => {
			this.sceneVolume.add(e.volume);
		};
		
		this.viewer.inputHandler.addEventListener("delete", e => {
			let volumes = e.selection.filter(e => (e instanceof ClipVolume));
			volumes.forEach(e => this.viewer.scene.removeClipVolume(e));
			let polyVolumes = e.selection.filter(e => (e instanceof PolygonClipVolume));
			polyVolumes.forEach(e => this.viewer.scene.removePolygonClipVolume(e));
		});
	}

	setScene(scene){
		if(this.scene === scene){
			return;
		}
		
		if(this.scene){
			this.scene.removeEventListeners("clip_volume_added", this.onAdd);
			this.scene.removeEventListeners("clip_volume_removed", this.onRemove);
			this.scene.removeEventListeners("polygon_clip_volume_added", this.onAdd);
			this.scene.removeEventListeners("polygon_clip_volume_removed", this.onRemove);
		}
		
		this.scene = scene;
		
		this.scene.addEventListener("clip_volume_added", this.onAdd);
		this.scene.addEventListener("clip_volume_removed", this.onRemove);
		this.scene.addEventListener("polygon_clip_volume_added", this.onAdd);
		this.scene.addEventListener("polygon_clip_volume_removed", this.onRemove);
	}

	startInsertion(args = {}) {	
		let type = args.type || null;

		if(!type) return null;

		let domElement = this.viewer.renderer.domElement;
		let canvasSize = this.viewer.renderer.getSize(new THREE.Vector2());

		let svg = $(`
		<svg height="${canvasSize.height}" width="${canvasSize.width}" style="position:absolute; pointer-events: none">

			<defs>
				 <marker id="diamond" markerWidth="24" markerHeight="24" refX="12" refY="12"
						markerUnits="userSpaceOnUse">
					<circle cx="12" cy="12" r="6" fill="white" stroke="black" stroke-width="3"/>
				</marker>
			</defs>

			<polyline fill="none" stroke="black" 
				style="stroke:rgb(0, 0, 0);
				stroke-width:6;"
				stroke-dasharray="9, 6"
				stroke-dashoffset="2"
				/>

			<polyline fill="none" stroke="black" 
				style="stroke:rgb(255, 255, 255);
				stroke-width:2;"
				stroke-dasharray="5, 10"
				marker-start="url(#diamond)" 
				marker-mid="url(#diamond)" 
				marker-end="url(#diamond)" 
				/>
		</svg>`);
		$(domElement.parentElement).append(svg);

		let polyClipVol = new PolygonClipVolume(this.viewer.scene.getActiveCamera().clone());

		this.dispatchEvent({"type": "start_inserting_clipping_volume"});

		this.viewer.scene.addPolygonClipVolume(polyClipVol);
		this.sceneMarker.add(polyClipVol);

		let cancel = {
			callback: null
		};

		let insertionCallback = (e) => {
			if(e.button === THREE.MOUSE.LEFT){
				
				polyClipVol.addMarker();

				// SVC Screen Line
				svg.find("polyline").each((index, target) => {
					let newPoint = svg[0].createSVGPoint();
					newPoint.x = e.offsetX;
					newPoint.y = e.offsetY;
					let polyline = target.points.appendItem(newPoint);
				});
				
				
				if(polyClipVol.markers.length > this.maxPolygonVertices){
					cancel.callback();
				}
				
				this.viewer.inputHandler.startDragging(
					polyClipVol.markers[polyClipVol.markers.length - 1]);
			}else if(e.button === THREE.MOUSE.RIGHT){
				cancel.callback(e);
			}
		};
		
		cancel.callback = e => {

			//let first = svg.find("polyline")[0].points[0];
			//svg.find("polyline").each((index, target) => {
			//	let newPoint = svg[0].createSVGPoint();
			//	newPoint.x = first.x;
			//	newPoint.y = first.y;
			//	let polyline = target.points.appendItem(newPoint);
			//});
			svg.remove();

			if(polyClipVol.markers.length > 3) {
				polyClipVol.removeLastMarker();
				polyClipVol.initialized = true;	
			} else {
				this.viewer.scene.removePolygonClipVolume(polyClipVol);
			}

			this.viewer.renderer.domElement.removeEventListener("mouseup", insertionCallback, true);
			this.viewer.removeEventListener("cancel_insertions", cancel.callback);
			this.viewer.inputHandler.enabled = true;
		};
		
		this.viewer.addEventListener("cancel_insertions", cancel.callback);
		this.viewer.renderer.domElement.addEventListener("mouseup", insertionCallback , true);
		this.viewer.inputHandler.enabled = false;
		
		polyClipVol.addMarker();
		this.viewer.inputHandler.startDragging(
			polyClipVol.markers[polyClipVol.markers.length - 1]);

		return polyClipVol;
	}

	update() {

	}
};