Ceremonial PR: fix map gen (#39)

improve errors

merge state debug dumper

use detailed debugging in map gen

more distinct wall chars

not all sealed walls are walls. okay

handle negative region IDs

also catches some missed semis

stop using the "dark shade" character for standard walls

now uses inverse bullet for sealed walls and full block otherwise

also show final result with region numbers

fix fencepost error when merging regions

map connectedness checker (floodfill)

check for connectedness in mapgen

add commented-out cheat and test buttons

looks like mapgen is now fixed. here are the buttons I used to test it

autoformat code

Merge branch 'main' into fix-mapgen

Co-authored-by: Kistaro Windrider <kistaro@gmail.com>
Reviewed-on: #39

src/engine/datatypes.ts

@@ -111,6 +111,15 @@ export class Point {
     let dy = other.y - this.y;
     return Math.sqrt(dx * dx + dy * dy);
   }
+
+  neighbors(): Point[] {
+    return [
+      new Point(this.x, this.y - 1),
+      new Point(this.x - 1, this.y),
+      new Point(this.x, this.y + 1),
+      new Point(this.x + 1, this.y),
+    ];
+  }
 }
 
 export class Size {
@@ -264,19 +273,29 @@ export class Grid<T> {
     return new Grid(this.size, (xy) => cbCell(this.get(xy), xy));
   }
 
-  #checkPosition(position: Point) {
-    if (
+  #invalidPosition(position: Point): boolean {
+    return (
       position.x < 0 ||
       position.x >= this.size.w ||
       Math.floor(position.x) != position.x ||
       position.y < 0 ||
       position.y >= this.size.h ||
       Math.floor(position.y) != position.y
-    ) {
+    );
+  }
+  #checkPosition(position: Point) {
+    if (this.#invalidPosition(position)) {
       throw new Error(`invalid position for ${this.size}: ${position}`);
     }
   }
 
+  maybeGet(position: Point): T | null {
+    if (this.#invalidPosition(position)) {
+      return null;
+    }
+    return this.#data[position.y][position.x];
+  }
+
   get(position: Point): T {
     this.#checkPosition(position);
     return this.#data[position.y][position.x];