@xeokit/xeokit-sdk
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3D BIM IFC Viewer SDK for AEC engineering applications. Open Source JavaScript Toolkit based on pure WebGL for top performance, real-world coordinates and full double precision
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JavaScript
import {Component} from "../../viewer/scene/Component.js";
import {math} from "../../viewer/scene/math/math.js";
import {Frustum, frustumIntersectsAABB3, setFrustum} from "../../viewer/scene/math/Frustum.js";
/**
* Picks a {@link Viewer}'s {@link Entity}s with a canvas-space 2D marquee box.
*
* [<img src="https://xeokit.github.io/xeokit-sdk/assets/images/MarqueeSelect.gif">](https://xeokit.github.io/xeokit-sdk/examples/picking/#marqueePick_select)
*
* * [[Example 1: Select Objects with Marquee](https://xeokit.github.io/xeokit-sdk/examples/picking/#marqueePick_select)]
* * [[Example 2: View-Fit Objects with Marquee](https://xeokit.github.io/xeokit-sdk/examples/picking/#marqueePick_viewFit)]
*
* # Usage
*
* In the example below, we
*
* 1. Create a {@link Viewer}, arrange the {@link Camera}
* 2. Use an {@link XKTLoaderPlugin} to load a BIM model,
* 3. Create a {@link ObjectsKdTree3} to automatically index the `Viewer's` {@link Entity}s for fast spatial lookup,
* 4. Create a `MarqueePicker` to pick {@link Entity}s in the {@link Viewer}, using the {@link ObjectsKdTree3} to accelerate picking
* 5. Create a {@link MarqueePickerMouseControl} to perform the marquee-picking with the `MarqueePicker`, using mouse input to draw the marquee box on the `Viewer's` canvas.
*
* When the {@link MarqueePickerMouseControl} is active:
*
* * Long-click, drag and release on the canvas to define a marque box that picks {@link Entity}s.
* * Drag left-to-right to pick {@link Entity}s that intersect the box.
* * Drag right-to-left to pick {@link Entity}s that are fully inside the box.
* * On release, the `MarqueePicker` will fire a "picked" event with IDs of the picked {@link Entity}s, if any.
* * Handling that event, we mark the {@link Entity}s as selected.
* * Hold down CTRL to multi-pick.
*
* ````javascript
* import {
* Viewer,
* XKTLoaderPlugin,
* ObjectsKdTree3,
* MarqueePicker,
* MarqueePickerMouseControl
* } from "xeokit-sdk.es.js";
*
* // 1
*
* const viewer = new Viewer({
* canvasId: "myCanvas"
* });
*
* viewer.scene.camera.eye = [14.9, 14.3, 5.4];
* viewer.scene.camera.look = [6.5, 8.3, -4.1];
* viewer.scene.camera.up = [-0.28, 0.9, -0.3];
*
* // 2
*
* const xktLoader = new XKTLoaderPlugin(viewer);
*
* const sceneModel = xktLoader.load({
* id: "myModel",
* src: "../../assets/models/xkt/v8/ifc/HolterTower.ifc.xkt"
* });
*
* // 3
*
* const objectsKdTree3 = new ObjectsKdTree3({viewer});
*
* // 4
*
* const marqueePicker = new MarqueePicker({viewer, objectsKdTree3});
*
* // 5
*
* const marqueePickerMouseControl = new MarqueePickerMouseControl({marqueePicker});
*
* marqueePicker.on("clear", () => {
* viewer.scene.setObjectsSelected(viewer.scene.selectedObjectIds, false);
* });
*
* marqueePicker.on("picked", (objectIds) => {
* viewer.scene.setObjectsSelected(objectIds, true);
* });
*
* marqueePickerMouseControl.setActive(true);
* ````
*
* # Design Notes
*
* * The {@link ObjectsKdTree3} can be shared with any other components that want to use it to spatially search for {@link Entity}s.
* * The {@link MarqueePickerMouseControl} can be replaced with other types of controllers (i.e. touch), or used alongside them.
* * The `MarqueePicker` has no input handlers of its own, and provides an API through which to programmatically control marquee picking. By firing the "picked" events, `MarqueePicker` implements the *Blackboard Pattern*.
*/
export class MarqueePicker extends Component {
/**
* Creates a MarqueePicker.
*
* @param {*} cfg Configuration
* @param {Viewer} cfg.viewer The Viewer to pick Entities from.
* @param {ObjectsKdTree3} cfg.objectsKdTree3 A k-d tree that indexes the Entities in the Viewer for fast spatial lookup.
*/
constructor(cfg = {}) {
if (!cfg.viewer) {
throw "[MarqueePicker] Missing config: viewer";
}
if (!cfg.objectsKdTree3) {
throw "[MarqueePicker] Missing config: objectsKdTree3";
}
super(cfg.viewer.scene, cfg);
this.viewer = cfg.viewer;
this._objectsKdTree3 = cfg.objectsKdTree3;
this._canvasMarqueeCorner1 = math.vec2();
this._canvasMarqueeCorner2 = math.vec2();
this._canvasMarquee = math.AABB2();
this._marqueeFrustum = new Frustum();
this._marqueeFrustumProjMat = math.mat4();
this._pickMode = false;
this._marqueeElement = document.createElement('div');
document.body.appendChild(this._marqueeElement);
this._marqueeElement.style.position = "absolute";
this._marqueeElement.style["z-index"] = "40000005";
this._marqueeElement.style.width = 8 + "px";
this._marqueeElement.style.height = 8 + "px";
this._marqueeElement.style.visibility = "hidden";
this._marqueeElement.style.top = 0 + "px";
this._marqueeElement.style.left = 0 + "px";
this._marqueeElement.style["box-shadow"] = "0 2px 5px 0 #182A3D;";
this._marqueeElement.style["opacity"] = 1.0;
this._marqueeElement.style["pointer-events"] = "none";
}
/**
* Sets the canvas-space position of the first marquee box corner.
*
* @param corner1
*/
setMarqueeCorner1(corner1) {
this._canvasMarqueeCorner1.set(corner1);
this._canvasMarqueeCorner2.set(corner1);
this._updateMarquee();
}
/**
* Sets the canvas-space position of the second marquee box corner.
*
* @param corner2
*/
setMarqueeCorner2(corner2) {
this._canvasMarqueeCorner2.set(corner2);
this._updateMarquee();
}
/**
* Sets both canvas-space corner positions of the marquee box.
*
* @param corner1
* @param corner2
*/
setMarquee(corner1, corner2) {
this._canvasMarqueeCorner1.set(corner1);
this._canvasMarqueeCorner2.set(corner2);
this._updateMarquee();
}
/**
* Sets if the marquee box is visible.
*
* @param {boolean} visible True if the marquee box is to be visible, else false.
*/
setMarqueeVisible(visible) {
this._marqueVisible = visible;
this._marqueeElement.style.visibility = visible ? "visible" : "hidden";
}
/**
* Gets if the marquee box is visible.
*
* @returns {boolean} True if the marquee box is visible, else false.
*/
getMarqueeVisible() {
return this._marqueVisible;
}
/**
* Sets the pick mode.
*
* Supported pick modes are:
*
* * MarqueePicker.PICK_MODE_INSIDE - picks {@link Entity}s that are completely inside the marquee box.
* * MarqueePicker.PICK_MODE_INTERSECTS - picks {@link Entity}s that intersect the marquee box.
*
* @param {number} pickMode The pick mode.
*/
setPickMode(pickMode) {
if (pickMode !== MarqueePicker.PICK_MODE_INSIDE && pickMode !== MarqueePicker.PICK_MODE_INTERSECTS) {
throw "Illegal MarqueePicker pickMode: must be MarqueePicker.PICK_MODE_INSIDE or MarqueePicker.PICK_MODE_INTERSECTS";
}
if (pickMode !== this._pickMode) {
this._marqueeElement.style["background-image"] =
pickMode === MarqueePicker.PICK_MODE_INSIDE
/* Solid */ ? "url(\"data:image/svg+xml,%3csvg width='100%25' height='100%25' xmlns='http://www.w3.org/2000/svg'%3e%3crect width='100%25' height='100%25' fill='none' rx='6' ry='6' stroke='%23333' stroke-width='4'/%3e%3c/svg%3e\")"
/* Dashed */ : "url(\"data:image/svg+xml,%3csvg width='100%25' height='100%25' xmlns='http://www.w3.org/2000/svg'%3e%3crect width='100%25' height='100%25' fill='none' rx='6' ry='6' stroke='%23333' stroke-width='4' stroke-dasharray='6%2c 14' stroke-dashoffset='0' stroke-linecap='square'/%3e%3c/svg%3e\")";
this._pickMode = pickMode;
}
}
/**
* Gets the pick mode.
*
* Supported pick modes are:
*
* * MarqueePicker.PICK_MODE_INSIDE - picks {@link Entity}s that are completely inside the marquee box.
* * MarqueePicker.PICK_MODE_INTERSECTS - picks {@link Entity}s that intersect the marquee box.
*
* @returns {number} The pick mode.
*/
getPickMode() {
return this._pickMode;
}
/**
* Fires a "clear" event on this MarqueePicker.
*/
clear() {
this.fire("clear", {})
}
/**
* Attempts to pick {@link Entity}s, using the current MarquePicker settings.
*
* Fires a "picked" event with the IDs of the {@link Entity}s that were picked, if any.
*
* @returns {string[]} IDs of the {@link Entity}s that were picked, if any
*/
pick() {
this._updateMarquee();
this._buildMarqueeFrustum();
const entityIds = [];
const visitNode = (node, intersects = Frustum.INTERSECT) => {
if (intersects === Frustum.INTERSECT) {
intersects = frustumIntersectsAABB3(this._marqueeFrustum, node.aabb);
}
if (intersects === Frustum.OUTSIDE) {
return;
}
if (node.entities) {
const entities = node.entities;
for (let i = 0, len = entities.length; i < len; i++) {
const entity = entities[i];
if (!entity.visible) {
continue;
}
const entityAABB = entity.aabb;
if (this._pickMode === MarqueePicker.PICK_MODE_INSIDE) {
// Select entities that are completely inside marquee
const intersection = frustumIntersectsAABB3(this._marqueeFrustum, entityAABB);
if (intersection === Frustum.INSIDE) {
entityIds.push(entity.id);
}
} else {
// Select entities that are partially inside marquee
const intersection = frustumIntersectsAABB3(this._marqueeFrustum, entityAABB);
if (intersection !== Frustum.OUTSIDE) {
entityIds.push(entity.id);
}
}
}
}
if (node.left) {
visitNode(node.left, intersects);
}
if (node.right) {
visitNode(node.right, intersects);
}
}
if (this._canvasMarquee[2] - this._canvasMarquee[0] > 3 || this._canvasMarquee[3] - this._canvasMarquee[1] > 3) { // Marquee pick if rectangle big enough
visitNode(this._objectsKdTree3.root);
}
this.fire("picked", entityIds);
return entityIds;
}
_updateMarquee() {
this._canvasMarquee[0] = Math.min(this._canvasMarqueeCorner1[0], this._canvasMarqueeCorner2[0]);
this._canvasMarquee[1] = Math.min(this._canvasMarqueeCorner1[1], this._canvasMarqueeCorner2[1]);
this._canvasMarquee[2] = Math.max(this._canvasMarqueeCorner1[0], this._canvasMarqueeCorner2[0]);
this._canvasMarquee[3] = Math.max(this._canvasMarqueeCorner1[1], this._canvasMarqueeCorner2[1]);
this._marqueeElement.style.width = `${this._canvasMarquee[2] - this._canvasMarquee[0]}px`;
this._marqueeElement.style.height = `${this._canvasMarquee[3] - this._canvasMarquee[1]}px`;
this._marqueeElement.style.left = `${this._canvasMarquee[0]}px`;
this._marqueeElement.style.top = `${this._canvasMarquee[1]}px`;
}
_buildMarqueeFrustum() { // https://github.com/xeokit/xeokit-sdk/issues/869#issuecomment-1165375770
const canvas = this.viewer.scene.canvas.canvas;
const canvasWidth = canvas.clientWidth;
const canvasHeight = canvas.clientHeight;
const canvasLeft = canvas.clientLeft;
const canvasTop = canvas.clientTop;
const xCanvasToClip = 2.0 / canvasWidth;
const yCanvasToClip = 2.0 / canvasHeight;
const NEAR_SCALING = 17;
const ratio = canvas.clientHeight / canvas.clientWidth;
const FAR_PLANE = 10000;
const left = (this._canvasMarquee[0] - canvasLeft) * xCanvasToClip + -1;
const right = (this._canvasMarquee[2] - canvasLeft) * xCanvasToClip + -1;
const bottom = -(this._canvasMarquee[3] - canvasTop) * yCanvasToClip + 1;
const top = -(this._canvasMarquee[1] - canvasTop) * yCanvasToClip + 1;
const near = this.viewer.scene.camera.frustum.near * (NEAR_SCALING * ratio);
const far = FAR_PLANE;
math.frustumMat4(
left,
right,
bottom * ratio,
top * ratio,
near,
far,
this._marqueeFrustumProjMat,
);
setFrustum(this._marqueeFrustum, this.viewer.scene.camera.viewMatrix, this._marqueeFrustumProjMat);
}
/**
* Destroys this MarqueePicker.
*
* Does not destroy the {@link Viewer} or the {@link ObjectsKdTree3} provided to the constructor of this MarqueePicker.
*/
destroy() {
super.destroy();
if (this._marqueeElement.parentElement) {
this._marqueeElement.parentElement.removeChild(this._marqueeElement);
this._marqueeElement = null;
this._objectsKdTree3 = null;
}
}
}
/**
* Pick mode that picks {@link Entity}s that intersect the marquee box.
*
* @type {number}
*/
MarqueePicker.PICK_MODE_INTERSECTS = 0;
/**
* Pick mode that picks {@link Entity}s that are completely inside the marquee box.
*
* @type {number}
*/
MarqueePicker.PICK_MODE_INSIDE = 1;