Track the path taken by tokens in combat and display it when reactivating DragRuler in the same turn

src/ruler.js

@@ -4,6 +4,18 @@ import {getSnapPointForToken} from "./util.js";
 
 export class DragRulerRuler extends Ruler {
 	// Functions below are overridden versions of functions in Ruler
+	constructor(user, {color=null}={}) {
+		super(user, {color});
+		this.previousWaypoints = [];
+		this.previousLabels = this.addChild(new PIXI.Container());
+	}
+
+	clear() {
+		super.clear();
+		this.previousWaypoints = [];
+		this.previousLabels.removeChildren().forEach(c => c.destroy());
+	}
+
 	async moveToken(event) {
 		// This function is invoked by left clicking
 		if (!this.isDragRuler)
@@ -57,8 +69,17 @@ export class DragRulerRuler extends Ruler {
 		this.labels.addChild(new PreciseText("", CONFIG.canvasTextStyle));
 	}
 
-	dragRulerDeleteWaypoint() {
-		if (this.waypoints.length > 1) {
+	dragRulerAddWaypointHistory(waypoints) {
+		waypoints = waypoints.map(waypoint => {return {x: waypoint.x, y: waypoint.y, isPrevious: true}});
+		this.waypoints = this.waypoints.concat(waypoints);
+		for (const waypoint of waypoints) {
+			this.labels.addChild(new PreciseText("", CONFIG.canvasTextStyle));
+		}
+	}
+
+	dragRulerDeleteWaypoint(event={preventDefault: () => {return}}) {
+		if (this.waypoints.filter(w => !w.isPrevious).length > 1) {
+			event.preventDefault();
 			const mousePosition = canvas.app.renderer.plugins.interaction.mouse.getLocalPosition(canvas.tokens);
 			const rulerOffset = this.rulerOffset;
 			this._removeWaypoint({x: mousePosition.x + rulerOffset.x, y: mousePosition.y + rulerOffset.y});
@@ -74,7 +95,17 @@ export class DragRulerRuler extends Ruler {
 
 			// This will cancel the current drag operation
 			// Pass in a fake event that hopefully is enough to allow other modules to function
-			token._onDragLeftCancel({preventDefault: () => {return}});
+			token._onDragLeftCancel(event);
 		}
 	}
+
+	dragRulerGetRaysFromWaypoints(waypoints, destination) {
+		if ( destination )
+			waypoints = waypoints.concat([destination]);
+		return waypoints.slice(1).map((wp, i) => {
+			const ray =  new Ray(waypoints[i], wp);
+			ray.isPrevious = Boolean(waypoints[i].isPrevious);
+			return ray;
+		});
+	}
 }