@tolokoban/tgd
Version:
ToloGameDev library for WebGL2
189 lines • 15.1 kB
JavaScript
/* eslint-disable unicorn/prevent-abbreviations */
import { TgdCameraPerspective } from "./../../camera/index.js";
import { TgdContext } from "./../../context/index.js";
import { TgdControllerCameraOrbit } from "./../../controller/index.js";
import { TgdEvent } from "./../../event/index.js";
import { TgdQuat, TgdMat3, TgdVec3 } from "./../../math/index.js";
import { TgdPainterClear, TgdPainterDepth, TgdPainterLogic } from "./../../painter/index.js";
import { TipsPainter } from "./painter/tips.js";
/**
* The Gizmo displays the orientation of an attached camera.
* You can click one of the axis to force the camera to face it.
*/
export class TgdCanvasGizmo {
constructor(options = {}) {
this.options = options;
/**
* The user clicked a tip, so we dispatch the target orientation.
*/
this.eventTipClick = new TgdEvent();
this._canvas = null;
this.context = null;
this.contextExternal = null;
this.cameraInternal = new TgdCameraPerspective({
fovy: Math.PI / 3,
near: 0.01,
far: 10,
transfo: { distance: 2.7 },
});
this.orbiter = null;
this.tipsPainter = null;
this.handleExternalPaint = () => {
this.context?.paint();
};
this.handleInternalToExternal = (internalCamera) => {
const { contextExternal } = this;
if (contextExternal?.camera) {
contextExternal.camera.transfo.orientation = internalCamera.transfo.orientation;
contextExternal.paint();
}
};
this.handleTap = (event) => {
const camera = this.context?.camera;
if (!camera)
return;
const { origin, direction } = camera.castRay(event.x, event.y);
const maxDistance = 1;
let bestDistance = maxDistance;
let bestTip = TIPS[0];
for (const tip of TIPS) {
const distance = tip.distanceToLineSquared(origin, direction);
if (distance < bestDistance) {
bestDistance = distance;
bestTip = tip;
}
}
if (bestDistance < maxDistance) {
const axisX = new TgdVec3();
const axisY = new TgdVec3();
const axisZ = bestTip;
axisX.from(this.findAxisX());
if (axisX.isClose(axisZ)) {
axisY.from(this.findAxisY());
axisX.from(axisY).cross(axisZ);
}
else {
axisY.from(axisZ).cross(axisX);
}
const quat = new TgdQuat().fromAxes(axisX, axisY, axisZ);
if (quat.isEqual(camera.transfo.orientation)) {
quat.rotateAroundY(Math.PI);
}
this.eventTipClick.dispatch({
from: camera.transfo.orientation,
to: quat,
});
}
};
if (options.canvas)
this.canvas = options.canvas;
}
/**
* Attach the camera we want to track and control.
*/
attachContext(context) {
this.detach();
this.contextExternal = context;
this.attach();
}
detach() {
if (!this.contextExternal)
return;
this.contextExternal.eventPaint.removeListener(this.handleExternalPaint);
this.contextExternal = null;
}
attach() {
this.contextExternal?.eventPaint.addListener(this.handleExternalPaint);
this.context?.paint();
}
get canvas() {
return this._canvas;
}
set canvas(canvas) {
if (canvas === this._canvas)
return;
this._canvas = canvas;
if (this.context) {
this.context.inputs.pointer.eventTap.removeListener(this.handleTap);
this.context.delete();
this.context = null;
const { orbiter } = this;
if (orbiter) {
orbiter.detach();
orbiter.eventChange.removeListener(this.handleInternalToExternal);
}
}
this.tipsPainter?.delete();
if (!canvas)
return;
const context = new TgdContext(canvas, {
alpha: true,
depth: true,
antialias: true,
name: "GizmoCanvas",
...this.options,
});
context.inputs.pointer.eventTap.addListener(this.handleTap);
this.context = context;
context.camera = this.cameraInternal;
this.orbiter = new TgdControllerCameraOrbit(context, {
speedPanning: 0,
speedZoom: 0,
});
this.orbiter.eventChange.addListener(this.handleInternalToExternal);
const painter = new TipsPainter(context);
this.tipsPainter = painter;
context.add(new TgdPainterLogic(() => {
const srcTransfo = this.contextExternal?.camera.transfo;
if (!srcTransfo)
return;
const dstTransfo = this.context?.camera.transfo;
if (!dstTransfo)
return;
dstTransfo.orientation = srcTransfo.orientation;
}), new TgdPainterClear(context, {
color: [0, 0, 0, 0],
depth: 1,
}), new TgdPainterDepth(context, { enabled: true }), painter);
context.paint();
}
findAxisX() {
let bestScore = 0;
let bestTip = TIPS[0];
const vec = new TgdVec3();
const mat = new TgdMat3();
mat.fromQuat(this.cameraInternal.transfo.orientation).transpose();
for (const tip of TIPS) {
vec.from(tip).applyMatrix(mat);
if (vec.x > bestScore) {
bestScore = vec.x;
bestTip = tip;
}
}
return bestTip;
}
findAxisY() {
let bestScore = 0;
let bestTip = TIPS[0];
const vec = new TgdVec3();
const mat = new TgdMat3();
mat.fromQuat(this.cameraInternal.transfo.orientation).transpose();
for (const tip of TIPS) {
vec.from(tip).applyMatrix(mat);
if (vec.y > bestScore) {
bestScore = vec.y;
bestTip = tip;
}
}
return bestTip;
}
}
const TIPS = [
new TgdVec3(1, 0, 0),
new TgdVec3(0, 1, 0),
new TgdVec3(0, 0, 1),
new TgdVec3(-1, 0, 0),
new TgdVec3(0, -1, 0),
new TgdVec3(0, 0, -1),
];
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