Proper bridge mask

ts/mask.ts

@@ -0,0 +1,42 @@
+export class Mask {
+  mask: boolean[][] = [];
+
+  constructor(width: number, height: number) {
+    for (let x = 0; x < width; x++) {
+      this.mask.push(Array(height).fill(false));
+    }
+  }
+
+  static from_string(mask_string: string): Mask {
+    // mask_string: '\n+++\n+++\n'
+    const rows = mask_string.trim().split('\n');
+    // rows: ['+++', '+++']
+
+    const mask = new Mask(rows[0].length, rows.length);
+
+    for (let y = 0; y < rows.length; y++) {
+      const row = rows[y];
+      for (let x = 0; x < row.length; x++) {
+        const cell = row[x].toLowerCase();
+        if (cell == '+' || cell == 'x') {
+          mask.set(x, y, true);
+        }
+      }
+    }
+
+    return mask;
+  }
+
+  set(x: number, y: number, val: boolean) {
+    this.mask[x][y] = val;
+  }
+
+  update(x: number, y: number, src: Mask) {
+    for (let xi = 0; xi < src.mask.length; xi++) {
+      const col = src.mask[xi];
+      for (let yi = 0; yi < col.length; yi++) {
+        this.set(x + xi, y + yi, col[yi]);
+      }
+    }
+  }
+}

ts/tiles.ts

@@ -143,6 +143,16 @@ export const RIVER_TR = new SimpleTileFactory('water', 12, 12, '{tileset}/river-
 export const RIVER_TL = new SimpleTileFactory('water', 12, 12, '{tileset}/river-tl.svg');
 
 export const BRIDGE_LR = new SimpleTileFactory('bridge', 12, 8, '{tileset}/bridge-lr.svg');
+BRIDGE_LR.add_mask('walkable', Mask.from_string(`
+............
+...XXXXXX...
+XXXXXXXXXXXX
+XXXXXXXXXXXX
+XXXXXXXXXXXX
+XXX......XXX
+............
+............
+`));
 
 const tower_fireball1_back = new SimpleTileFactory('surface', 8, 8, 'tower/fireball1-back.svg');
 const tower_fireball1 = new SimpleTileFactory('surface', 8, 8, 'tower/fireball1.svg');

ts/tower.ts

@@ -114,7 +114,7 @@ export function main() {
     tower.play('fire');
     const target_relative_x = rand(-40, 40);
     const target_relative_y = rand(-20, 40);
-    const factory = new ProjectileTileFactory(tiles.FIREBALL, target_relative_x, target_relative_y, 5, 1.5, 5);
+    const factory = new ProjectileTileFactory(tiles.FIREBALL, target_relative_x, target_relative_y, 5, 3, 10);
     grid.add_tile(factory, 62, 54);
     setTimeout(() => {
       grid.add_tile(tiles.FIREBALL_IMPACT, 62 + target_relative_x, 54 + target_relative_y);