Disallow shrinking zone if there are buildings

src/js/game/game_mode.js

@@ -142,7 +142,7 @@ export class GameMode extends BasicSerializableObject {
      * @param {number} w
      * @param {number} h
      */
-    expandZone(w = 0, h = 0) {
+    adjustZone(w = 0, h = 0) {
         abstract;
         return;
     }

src/js/game/hud/parts/mode_settings.js

@@ -48,7 +48,7 @@ export class HUDModeSettings extends BaseHUDPart {
     }
 
     modifyZone(width, height) {
-        this.root.gameMode.expandZone(width, height);
+        this.root.gameMode.adjustZone(width, height);
         this.updateZoneValues();
     }
 

src/js/game/modes/puzzle_edit.js

@@ -55,16 +55,28 @@ export class PuzzleEditGameMode extends PuzzleGameMode {
         ];
     }
 
-    expandZone(w = 0, h = 0) {
-        if (this.zoneWidth + w > 0) {
-            this.zoneWidth += w;
+    adjustZone(w = 0, h = 0) {
+        // @todo notify user when zone cannot be shrunk
+        if (this.zoneWidth + w <= 0) {
+            return;
         }
 
-        if (this.zoneHeight + h > 0) {
-            this.zoneHeight += h;
+        if (this.zoneHeight + h <= 0) {
+            return;
         }
 
-        this.zone = this.createCenteredRectangle(this.zoneWidth, this.zoneHeight);
+        const newZone = this.createCenteredRectangle(this.zoneWidth + w, this.zoneHeight + h);
+        const entities = this.root.entityMgr.entities;
+
+        for (const entity of entities) {
+            const point = entity.components.StaticMapEntity.origin;
+            if (!newZone.containsPoint(point.x, point.y)) {
+                return;
+            }
+        }
+
+        this.zoneWidth = newZone.w;
+        this.zoneHeight = newZone.h;
     }
 
     getIsEditor() {