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import type { LaserPointerOptions } from "@excalidraw/laser-pointer";
import type { Trail } from "./animated-trail";
import { AnimatedTrail } from "./animated-trail";
import type { AnimationFrameHandler } from "./animation-frame-handler";
import type App from "./components/App";
import type { SocketId } from "./types";
import { easeOut } from "./utils";
import { getClientColor } from "./clients";
import { DEFAULT_LASER_COLOR } from "./constants";
export class LaserTrails implements Trail {
public localTrail: AnimatedTrail;
private collabTrails = new Map<SocketId, AnimatedTrail>();
private container?: SVGSVGElement;
constructor(
private animationFrameHandler: AnimationFrameHandler,
private app: App,
) {
this.animationFrameHandler.register(this, this.onFrame.bind(this));
this.localTrail = new AnimatedTrail(animationFrameHandler, app, {
...this.getTrailOptions(),
fill: () => DEFAULT_LASER_COLOR,
});
}
private getTrailOptions() {
return {
simplify: 0,
streamline: 0.4,
sizeMapping: (c) => {
const DECAY_TIME = 1000;
const DECAY_LENGTH = 50;
const t = Math.max(
0,
1 - (performance.now() - c.pressure) / DECAY_TIME,
);
const l =
(DECAY_LENGTH -
Math.min(DECAY_LENGTH, c.totalLength - c.currentIndex)) /
DECAY_LENGTH;
return Math.min(easeOut(l), easeOut(t));
},
} as Partial<LaserPointerOptions>;
}
startPath(x: number, y: number): void {
this.localTrail.startPath(x, y);
}
addPointToPath(x: number, y: number): void {
this.localTrail.addPointToPath(x, y);
}
endPath(): void {
this.localTrail.endPath();
}
start(container: SVGSVGElement) {
this.container = container;
this.animationFrameHandler.start(this);
this.localTrail.start(container);
}
stop() {
this.animationFrameHandler.stop(this);
this.localTrail.stop();
}
onFrame() {
this.updateCollabTrails();
}
private updateCollabTrails() {
if (!this.container || this.app.state.collaborators.size === 0) {
return;
}
for (const [key, collaborator] of this.app.state.collaborators.entries()) {
let trail!: AnimatedTrail;
if (!this.collabTrails.has(key)) {
trail = new AnimatedTrail(this.animationFrameHandler, this.app, {
...this.getTrailOptions(),
fill: () =>
collaborator.pointer?.laserColor ||
getClientColor(key, collaborator),
});
trail.start(this.container);
this.collabTrails.set(key, trail);
} else {
trail = this.collabTrails.get(key)!;
}
if (collaborator.pointer && collaborator.pointer.tool === "laser") {
if (collaborator.button === "down" && !trail.hasCurrentTrail) {
trail.startPath(collaborator.pointer.x, collaborator.pointer.y);
}
if (
collaborator.button === "down" &&
trail.hasCurrentTrail &&
!trail.hasLastPoint(collaborator.pointer.x, collaborator.pointer.y)
) {
trail.addPointToPath(collaborator.pointer.x, collaborator.pointer.y);
}
if (collaborator.button === "up" && trail.hasCurrentTrail) {
trail.addPointToPath(collaborator.pointer.x, collaborator.pointer.y);
trail.endPath();
}
}
}
for (const key of this.collabTrails.keys()) {
if (!this.app.state.collaborators.has(key)) {
const trail = this.collabTrails.get(key)!;
trail.stop();
this.collabTrails.delete(key);
}
}
}
}
|
