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import type { LaserPointerOptions } from "@excalidraw/laser-pointer";
import { LaserPointer } from "@excalidraw/laser-pointer";
import type { AnimationFrameHandler } from "./animation-frame-handler";
import type { AppState } from "./types";
import { getSvgPathFromStroke, sceneCoordsToViewportCoords } from "./utils";
import type App from "./components/App";
import { SVG_NS } from "./constants";
export interface Trail {
start(container: SVGSVGElement): void;
stop(): void;
startPath(x: number, y: number): void;
addPointToPath(x: number, y: number): void;
endPath(): void;
}
export interface AnimatedTrailOptions {
fill: (trail: AnimatedTrail) => string;
}
export class AnimatedTrail implements Trail {
private currentTrail?: LaserPointer;
private pastTrails: LaserPointer[] = [];
private container?: SVGSVGElement;
private trailElement: SVGPathElement;
constructor(
private animationFrameHandler: AnimationFrameHandler,
private app: App,
private options: Partial<LaserPointerOptions> &
Partial<AnimatedTrailOptions>,
) {
this.animationFrameHandler.register(this, this.onFrame.bind(this));
this.trailElement = document.createElementNS(SVG_NS, "path");
}
get hasCurrentTrail() {
return !!this.currentTrail;
}
hasLastPoint(x: number, y: number) {
if (this.currentTrail) {
const len = this.currentTrail.originalPoints.length;
return (
this.currentTrail.originalPoints[len - 1][0] === x &&
this.currentTrail.originalPoints[len - 1][1] === y
);
}
return false;
}
start(container?: SVGSVGElement) {
if (container) {
this.container = container;
}
if (this.trailElement.parentNode !== this.container && this.container) {
this.container.appendChild(this.trailElement);
}
this.animationFrameHandler.start(this);
}
stop() {
this.animationFrameHandler.stop(this);
if (this.trailElement.parentNode === this.container) {
this.container?.removeChild(this.trailElement);
}
}
startPath(x: number, y: number) {
this.currentTrail = new LaserPointer(this.options);
this.currentTrail.addPoint([x, y, performance.now()]);
this.update();
}
addPointToPath(x: number, y: number) {
if (this.currentTrail) {
this.currentTrail.addPoint([x, y, performance.now()]);
this.update();
}
}
endPath() {
if (this.currentTrail) {
this.currentTrail.close();
this.currentTrail.options.keepHead = false;
this.pastTrails.push(this.currentTrail);
this.currentTrail = undefined;
this.update();
}
}
private update() {
this.start();
}
private onFrame() {
const paths: string[] = [];
for (const trail of this.pastTrails) {
paths.push(this.drawTrail(trail, this.app.state));
}
if (this.currentTrail) {
const currentPath = this.drawTrail(this.currentTrail, this.app.state);
paths.push(currentPath);
}
this.pastTrails = this.pastTrails.filter((trail) => {
return trail.getStrokeOutline().length !== 0;
});
if (paths.length === 0) {
this.stop();
}
const svgPaths = paths.join(" ").trim();
this.trailElement.setAttribute("d", svgPaths);
this.trailElement.setAttribute(
"fill",
(this.options.fill ?? (() => "black"))(this),
);
}
private drawTrail(trail: LaserPointer, state: AppState): string {
const stroke = trail
.getStrokeOutline(trail.options.size / state.zoom.value)
.map(([x, y]) => {
const result = sceneCoordsToViewportCoords(
{ sceneX: x, sceneY: y },
state,
);
return [result.x, result.y];
});
return getSvgPathFromStroke(stroke, true);
}
}
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