refactor: mass refactoring

src/core/region.ts

@@ -0,0 +1,41 @@
+import {Entity, EntityAccessor} from "../utils/entity";
+import {Part} from "./part";
+import {RNG} from "../utils/rng";
+
+export type Region = Entity & {
+  // aligning axes of the region
+  axes: RegionAxis[];
+  
+  // current children; expect no overlapped positions
+  children: EntityAccessor<Part>[];
+}
+
+export type RegionAxis = {
+  name: string;
+  min?: number;
+  max?: number;
+  align?: 'start' | 'end' | 'center';
+}
+
+/**
+ * for each axis, try to remove gaps in positions.
+ * - if min exists and align is start, and there are parts at (for example) min+2 and min+4, then move them to min and min+1
+ * - if max exists and align is end, and there are parts at (for example) max-2 and max-4, then move them to max-1 and max-3
+ * - for center, move parts to the center, possibly creating parts placed at 0.5 positions
+ * - sort children so that they're in ascending order on each axes.
+ * @param region
+ */
+export function applyAlign(region: Region){
+  for (const axis of region.axes) {
+    // TODO implement this
+  }
+}
+
+/**
+ * shuffle on each axis. for each axis, try to swap position.
+ * @param region
+ * @param rng
+ */
+export function shuffle(region: Region, rng: RNG){
+  // TODO implement this
+}