Add in throwable items (dagger) from pixel dungeon

src/engine/gameplay/CombatLogic.ts

@@ -0,0 +1,53 @@
+import { type World, type Vec2, type EntityId } from "../../core/types";
+import { isBlocked } from "../world/world-logic";
+import { raycast } from "../../core/math";
+import { EntityManager } from "../EntityManager";
+
+export interface ProjectileResult {
+    path: Vec2[];
+    blockedPos: Vec2;
+    hitActorId?: EntityId;
+}
+
+/**
+ * Calculates the path and impact of a projectile.
+ */
+export function traceProjectile(
+    world: World, 
+    start: Vec2, 
+    target: Vec2, 
+    entityManager: EntityManager,
+    shooterId?: EntityId
+): ProjectileResult {
+    const points = raycast(start.x, start.y, target.x, target.y);
+    let blockedPos = target;
+    let hitActorId: EntityId | undefined;
+
+    // Iterate points (skip start)
+    for (let i = 1; i < points.length; i++) {
+        const p = points[i];
+
+        // Check for blocking
+        if (isBlocked(world, p.x, p.y, entityManager)) {
+            // Check if we hit a combatant
+            const actors = entityManager.getActorsAt(p.x, p.y);
+            const enemy = actors.find(a => a.category === "combatant" && a.id !== shooterId);
+            
+            if (enemy) {
+                hitActorId = enemy.id;
+                blockedPos = p;
+            } else {
+                // Hit wall or other obstacle
+                blockedPos = p;
+            }
+            break;
+        }
+        blockedPos = p;
+    }
+
+    return {
+        path: points,
+        blockedPos,
+        hitActorId
+    };
+}