snapshot of https://github.com/excalidraw/excalidraw.git (master, 2026-09-16; blobs > 131072B omitted)

packages/excalidraw/drawShapeTrail.ts

@@ -0,0 +1,80 @@
+import { getStrokeWidthByKey, THEME } from "@excalidraw/common";
+import { clamp, pointFrom } from "@excalidraw/math";
+
+import type { LaserPointerOptions } from "@excalidraw/laser-pointer";
+import type { GlobalPoint } from "@excalidraw/math";
+
+import { AnimatedTrail } from "./animatedTrail";
+
+import type App from "./components/App";
+import type { Trail } from "./animatedTrail";
+
+export class DrawShapeTrail implements Trail {
+  private trail: AnimatedTrail;
+
+  constructor(private app: App) {
+    this.trail = new AnimatedTrail(this.app, {
+      ...this.getTrailOptions(),
+      fill: () =>
+        app.state.theme === THEME.LIGHT
+          ? "rgba(0, 0, 0, 0.2)"
+          : "rgba(255, 255, 255, 0.2)",
+    });
+  }
+
+  private getTrailOptions() {
+    return {
+      simplify: 0,
+      streamline: 0.4,
+      size: 1,
+      sizeMapping: () => {
+        const size = clamp(
+          getStrokeWidthByKey(
+            "line",
+            this.app.state.currentItemStrokeWidthKey,
+          ) *
+            0.65 *
+            this.app.state.zoom.value,
+          1.25,
+          4,
+        );
+        return size;
+      },
+    } as Partial<LaserPointerOptions>;
+  }
+
+  startPath(x: number, y: number): void {
+    this.trail.startPath(x, y);
+  }
+
+  addPointToPath(x: number, y: number): void {
+    this.trail.addPointToPath(x, y);
+  }
+
+  endPath(): void {
+    this.trail.endPath();
+  }
+
+  clearTrails(): void {
+    this.trail.clearTrails();
+  }
+
+  getCurrentPoints(): GlobalPoint[] {
+    const currentTrail = this.trail.getCurrentTrail();
+    if (!currentTrail) {
+      return [];
+    }
+
+    return currentTrail.originalPoints.map(([x, y]) =>
+      pointFrom<GlobalPoint>(x, y),
+    );
+  }
+
+  start(container: SVGSVGElement) {
+    this.trail.start(container);
+  }
+
+  stop() {
+    this.trail.stop();
+  }
+}