playcanvas
Version:
PlayCanvas WebGL game engine
310 lines (307 loc) • 10 kB
JavaScript
import { math } from '../../core/math/math.js';
import { Quat } from '../../core/math/quat.js';
import { Vec3 } from '../../core/math/vec3.js';
import { Mat4 } from '../../core/math/mat4.js';
import { Ray } from '../../core/shape/ray.js';
import { EventHandler } from '../../core/event-handler.js';
import { SORTMODE_NONE, PROJECTION_PERSPECTIVE } from '../../scene/constants.js';
import { Entity } from '../../framework/entity.js';
import { Layer } from '../../scene/layer.js';
const v = new Vec3();
const position = new Vec3();
const dir = new Vec3();
const rotation = new Quat();
const m1 = new Mat4();
const m2 = new Mat4();
const ray = new Ray();
const MIN_SCALE = 1e-4;
const PERS_SCALE_RATIO = 0.3;
const ORTHO_SCALE_RATIO = 0.32;
const UPDATE_EPSILON = 1e-6;
const DIST_EPSILON = 1e-4;
class Gizmo extends EventHandler {
static{
this.EVENT_POINTERDOWN = 'pointer:down';
}
static{
this.EVENT_POINTERMOVE = 'pointer:move';
}
static{
this.EVENT_POINTERUP = 'pointer:up';
}
static{
this.EVENT_POSITIONUPDATE = 'position:update';
}
static{
this.EVENT_ROTATIONUPDATE = 'rotation:update';
}
static{
this.EVENT_SCALEUPDATE = 'scale:update';
}
static{
this.EVENT_NODESATTACH = 'nodes:attach';
}
static{
this.EVENT_NODESDETACH = 'nodes:detach';
}
static{
this.EVENT_RENDERUPDATE = 'render:update';
}
static createLayer(app, layerName = 'Gizmo', layerIndex = app.scene.layers.layerList.length) {
const layer = new Layer({
name: layerName,
clearDepthBuffer: true,
opaqueSortMode: SORTMODE_NONE,
transparentSortMode: SORTMODE_NONE
});
app.scene.layers.insert(layer, layerIndex);
return layer;
}
constructor(camera, layer, name = 'gizmo'){
super(), this._size = 1, this._scale = 1, this._coordSpace = 'world', this._handles = [], this._renderUpdate = false, this.nodes = [], this.intersectShapes = [];
this._layer = layer;
this._camera = camera;
this._camera.layers = this._camera.layers.concat(this._layer.id);
this._app = this._camera.system.app;
this._device = this._app.graphicsDevice;
this.root = new Entity(name);
this._app.root.addChild(this.root);
this.root.enabled = false;
this._updateScale();
this._onPointerDown = this._onPointerDown.bind(this);
this._onPointerMove = this._onPointerMove.bind(this);
this._onPointerUp = this._onPointerUp.bind(this);
this._device.canvas.addEventListener('pointerdown', this._onPointerDown);
this._device.canvas.addEventListener('pointermove', this._onPointerMove);
this._device.canvas.addEventListener('pointerup', this._onPointerUp);
this._handles.push(this._app.on('prerender', ()=>this.prerender()));
this._handles.push(this._app.on('update', ()=>this.update()));
this._handles.push(this._app.on('destroy', ()=>this.destroy()));
}
set enabled(state) {
const cameraDist = this.root.getLocalPosition().distance(this.camera.entity.getPosition());
const enabled = state ? this.nodes.length > 0 && cameraDist > DIST_EPSILON : false;
if (enabled !== this.root.enabled) {
this.root.enabled = enabled;
this._renderUpdate = true;
}
}
get enabled() {
return this.root.enabled;
}
set layer(layer) {
if (this._layer === layer) {
return;
}
this._camera.layers = this._camera.layers.filter((id)=>id !== this._layer.id);
this._layer = layer;
this._camera.layers = this._camera.layers.concat(this._layer.id);
this.enabled = true;
}
get layer() {
return this._layer;
}
set camera(camera) {
if (this._camera === camera) {
return;
}
this._camera.layers = this._camera.layers.filter((id)=>id !== this._layer.id);
this._camera = camera;
this._camera.layers = this._camera.layers.concat(this._layer.id);
this.enabled = true;
}
get camera() {
return this._camera;
}
set coordSpace(value) {
this._coordSpace = value ?? this._coordSpace;
this._updateRotation();
}
get coordSpace() {
return this._coordSpace;
}
set size(value) {
this._size = value;
this._updateScale();
}
get size() {
return this._size;
}
get facingDir() {
if (this._camera.projection === PROJECTION_PERSPECTIVE) {
const gizmoPos = this.root.getLocalPosition();
const cameraPos = this._camera.entity.getPosition();
return dir.sub2(cameraPos, gizmoPos).normalize();
}
return dir.copy(this._camera.entity.forward).mulScalar(-1);
}
get cameraDir() {
const cameraPos = this._camera.entity.getPosition();
const gizmoPos = this.root.getLocalPosition();
return dir.sub2(cameraPos, gizmoPos).normalize();
}
_onPointerDown(e) {
if (!this.enabled || document.pointerLockElement) {
return;
}
const selection = this._getSelection(e.offsetX, e.offsetY);
if (selection[0]) {
e.preventDefault();
e.stopPropagation();
}
const { canvas } = this._device;
canvas.setPointerCapture(e.pointerId);
this.fire(Gizmo.EVENT_POINTERDOWN, e.offsetX, e.offsetY, selection[0]);
}
_onPointerMove(e) {
if (!this.enabled || document.pointerLockElement) {
return;
}
const selection = this._getSelection(e.offsetX, e.offsetY);
if (selection[0]) {
e.preventDefault();
e.stopPropagation();
}
this.fire(Gizmo.EVENT_POINTERMOVE, e.offsetX, e.offsetY, selection[0]);
}
_onPointerUp(e) {
if (!this.enabled || document.pointerLockElement) {
return;
}
const selection = this._getSelection(e.offsetX, e.offsetY);
if (selection[0]) {
e.preventDefault();
e.stopPropagation();
}
const { canvas } = this._device;
canvas.releasePointerCapture(e.pointerId);
this.fire(Gizmo.EVENT_POINTERUP, e.offsetX, e.offsetY, selection[0]);
}
_updatePosition() {
position.set(0, 0, 0);
for(let i = 0; i < this.nodes.length; i++){
const node = this.nodes[i];
position.add(node.getPosition());
}
position.mulScalar(1.0 / (this.nodes.length || 1));
if (position.equalsApprox(this.root.getLocalPosition(), UPDATE_EPSILON)) {
return;
}
this.root.setLocalPosition(position);
this.fire(Gizmo.EVENT_POSITIONUPDATE, position);
this._renderUpdate = true;
}
_updateRotation() {
rotation.set(0, 0, 0, 1);
if (this._coordSpace === 'local' && this.nodes.length !== 0) {
rotation.copy(this.nodes[this.nodes.length - 1].getRotation());
}
if (rotation.equalsApprox(this.root.getRotation(), UPDATE_EPSILON)) {
return;
}
this.root.setRotation(rotation);
this.fire(Gizmo.EVENT_ROTATIONUPDATE, rotation.getEulerAngles());
this._renderUpdate = true;
}
_updateScale() {
if (this._camera.projection === PROJECTION_PERSPECTIVE) {
const gizmoPos = this.root.getLocalPosition();
const cameraPos = this._camera.entity.getPosition();
const dist = gizmoPos.distance(cameraPos);
this._scale = Math.tan(0.5 * this._camera.fov * math.DEG_TO_RAD) * dist * PERS_SCALE_RATIO;
} else {
this._scale = this._camera.orthoHeight * ORTHO_SCALE_RATIO;
}
this._scale = Math.max(this._scale * this._size, MIN_SCALE);
if (Math.abs(this._scale - this.root.getLocalScale().x) < UPDATE_EPSILON) {
return;
}
this.root.setLocalScale(this._scale, this._scale, this._scale);
this.fire(Gizmo.EVENT_SCALEUPDATE, this._scale);
this._renderUpdate = true;
}
_getSelection(x, y) {
const start = this._camera.screenToWorld(x, y, 0);
const end = this._camera.screenToWorld(x, y, this._camera.farClip - this._camera.nearClip);
const dir = v.copy(end).sub(start).normalize();
const selection = [];
for(let i = 0; i < this.intersectShapes.length; i++){
const shape = this.intersectShapes[i];
if (shape.disabled || !shape.entity.enabled) {
continue;
}
const parentTM = shape.entity.getWorldTransform();
for(let j = 0; j < shape.triData.length; j++){
const { tris, transform, priority } = shape.triData[j];
const triWTM = m1.copy(parentTM).mul(transform);
const invTriWTM = m2.copy(triWTM).invert();
invTriWTM.transformPoint(start, ray.origin);
invTriWTM.transformVector(dir, ray.direction);
ray.direction.normalize();
for(let k = 0; k < tris.length; k++){
if (tris[k].intersectsRay(ray, v)) {
selection.push({
dist: triWTM.transformPoint(v).sub(start).length(),
meshInstances: shape.meshInstances,
priority: priority
});
}
}
}
}
if (selection.length) {
selection.sort((s0, s1)=>{
if (s0.priority !== 0 && s1.priority !== 0) {
return s1.priority - s0.priority;
}
return s0.dist - s1.dist;
});
return selection[0].meshInstances;
}
return [];
}
attach(nodes = []) {
if (Array.isArray(nodes)) {
if (nodes.length === 0) {
return;
}
this.nodes = nodes;
} else {
this.nodes = [
nodes
];
}
this._updatePosition();
this._updateRotation();
this._updateScale();
this.fire(Gizmo.EVENT_NODESATTACH);
this.enabled = true;
}
detach() {
this.enabled = false;
this.fire(Gizmo.EVENT_NODESDETACH);
this.nodes = [];
}
prerender() {}
update() {
if (this._renderUpdate) {
this._renderUpdate = false;
this.fire(Gizmo.EVENT_RENDERUPDATE);
}
if (!this.enabled) {
return;
}
this._updatePosition();
this._updateRotation();
this._updateScale();
}
destroy() {
this.detach();
this._device.canvas.removeEventListener('pointerdown', this._onPointerDown);
this._device.canvas.removeEventListener('pointermove', this._onPointerMove);
this._device.canvas.removeEventListener('pointerup', this._onPointerUp);
this._handles.forEach((handle)=>handle.off());
this.root.destroy();
}
}
export { Gizmo };