feat: add new functions

src/core/region.ts

@@ -113,4 +113,48 @@ function shuffleCore(region: Region, rng: RNG){
       draft.position = posI;
     });
   }
+}
+
+export function moveToRegion(part: Entity<Part>, targetRegion: Entity<Region>, position?: number[]) {
+  const sourceRegion = part.value.region;
+  batch(() => {
+    sourceRegion.produce(draft => {
+      draft.children = draft.children.filter(c => c.id !== part.id);
+    });
+    targetRegion.produce(draft => {
+      draft.children.push(part);
+    });
+    part.produce(draft => {
+      draft.region = targetRegion;
+      if (position) draft.position = position;
+    });
+  });
+}
+
+export function moveToRegionAll(parts: Entity<Part>[], targetRegion: Entity<Region>, positions?: number[][]) {
+  batch(() => {
+    for (let i = 0; i < parts.length; i++) {
+      const part = parts[i];
+      const sourceRegion = part.value.region;
+      sourceRegion.produce(draft => {
+        draft.children = draft.children.filter(c => c.id !== part.id);
+      });
+      targetRegion.produce(draft => {
+        draft.children.push(part);
+      });
+      part.produce(draft => {
+        draft.region = targetRegion;
+        if (positions && positions[i]) draft.position = positions[i];
+      });
+    }
+  });
+}
+
+export function removeFromRegion(part: Entity<Part>) {
+  const region = part.value.region;
+  batch(() => {
+    region.produce(draft => {
+      draft.children = draft.children.filter(c => c.id !== part.id);
+    });
+  });
 }

src/index.ts

@@ -11,7 +11,7 @@ export type { Part } from './core/part';
 export { flip, flipTo, roll } from './core/part';
 
 export type { Region, RegionAxis } from './core/region';
-export { applyAlign, shuffle, RegionEntity } from './core/region';
+export { applyAlign, shuffle, RegionEntity, moveToRegion, moveToRegionAll, removeFromRegion } from './core/region';
 
 // Utils
 export type { Command, CommandSchema, CommandParamSchema, CommandOptionSchema, CommandFlagSchema } from './utils/command';