v0.7: A* pathfinding, mouse control, step-up, jump limits

- A* pathfinding for actor (find_path in actors.rs)
- Right-click sets target (actor_goto), finds ground below air clicks
- Actor follows path with horizontal velocity + jumping
- Step-up: actor climbs 1-4px small edges/obstacles
- Jump height limited to 40px in pathfinding (avoids unreachable targets)
- Powder displacement when walking through sand/dirt
- Actor collision: solids block, powders pass-through
- Fallback: direct movement if no path found

web/src/engine.ts

@@ -13,6 +13,7 @@ import __wbg_init, {
   actor_y,
   move_actor,
   update_actor,
+  actor_goto,
 } from "../pkg/atomic_engine.js";
 
 export const M = {
@@ -89,6 +90,7 @@ export interface Engine {
   actorY: () => number;
   moveActor: (dx: number, dy: number) => void;
   updateActor: (dt: number) => void;
+  actorGoto: (x: number, y: number) => void;
   memory: WebAssembly.Memory;
 }
 
@@ -111,5 +113,6 @@ export async function createEngine(gridWidth: number, gridHeight: number): Promi
     actorY: () => actor_y(),
     moveActor: (dx, dy) => move_actor(dx, dy),
     updateActor: (dt) => update_actor(dt),
+    actorGoto: (x, y) => actor_goto(x, y),
   };
 }

web/src/input.ts

@@ -3,6 +3,7 @@ export class Input {
   mouseX = 0;
   mouseY = 0;
   mouseDown = false;
+  mouseRight = false;
   wheel = 0;
 
   constructor() {
@@ -12,11 +13,19 @@ export class Input {
       this.mouseX = e.clientX;
       this.mouseY = e.clientY;
     });
-    window.addEventListener("mousedown", () => (this.mouseDown = true));
+    window.addEventListener("mousedown", (e) => {
+      if (e.button === 2) {
+        this.mouseRight = true;
+        e.preventDefault();
+      } else {
+        this.mouseDown = true;
+      }
+    });
     window.addEventListener("mouseup", () => (this.mouseDown = false));
     window.addEventListener("wheel", (e) => {
       this.wheel += e.deltaY > 0 ? -1 : 1;
     });
+    window.addEventListener("contextmenu", (e) => e.preventDefault());
   }
 
   isDown(key: string): boolean {

web/src/main.ts

@@ -210,6 +210,11 @@ async function main() {
       const g = screenToGrid(input.mouseX, input.mouseY);
       engine.fillCircle(g.x, g.y, 6, paintMat);
     }
+    if (input.mouseRight) {
+      const g = screenToGrid(input.mouseX, input.mouseY);
+      engine.actorGoto(g.x, g.y);
+      input.mouseRight = false;
+    }
 
     camera.update(dt);
     engine.updateRender(