From 0416085ee19b8addc8fbbbcbc8b82811b14bfd69 Mon Sep 17 00:00:00 2001
From: cha0s <git@cha0s.io>
Date: Sat, 20 Mar 2021 13:42:27 -0500
Subject: [PATCH] feat: tile geometry!

---
 .../physics/src/resources/decorators/layer.js | 78 ++++++++++++++-----
 .../src/resources/decorators/layers.js        | 18 +++++
 2 files changed, 77 insertions(+), 19 deletions(-)

diff --git a/packages/physics/src/resources/decorators/layer.js b/packages/physics/src/resources/decorators/layer.js
index 47e6132..830e682 100644
--- a/packages/physics/src/resources/decorators/layer.js
+++ b/packages/physics/src/resources/decorators/layer.js
@@ -1,26 +1,66 @@
+import {
+  Vector,
+  Vertice,
+} from '@avocado/math';
+
+import PolygonShape from '../../shape/polygon';
+
 export default (Layer) => class PhysicsLayer extends Layer {
 
+  #tileBodies = [];
+
+  #world;
+
+  addTileBodies() {
+    if (!this.hasImpassableLayerZero()) {
+      return;
+    }
+    if (!this.#world) {
+      return;
+    }
+    const hulls = this.tiles.indexHulls(0);
+    if (!hulls.length > 0) {
+      return;
+    }
+    const {tileset} = this;
+    if (!tileset) {
+      return;
+    }
+    for (let i = 0; i < hulls.length; ++i) {
+      const scaled = [];
+      for (let j = 0; j < hulls[i].length; j++) {
+        scaled.push(Vector.mul(hulls[i][j], tileset.tileSize));
+      }
+      const [vertices, position] = Vertice.localize(scaled);
+      const shape = new PolygonShape({position, vertices});
+      const body = this.#world.createBody(shape);
+      body.static = true;
+      this.#tileBodies.push(body);
+      this.#world.addBody(body);
+    }
+  }
+
+  hasImpassableLayerZero() {
+    return 1 === this.index;
+  }
+
+  removeTileBodies() {
+    if (!this.hasImpassableLayerZero()) {
+      return;
+    }
+    if (this.#tileBodies.length > 0 && this.#world) {
+      for (let i = 0; i < this.#tileBodies.length; i++) {
+        this.#world.removeBody(this.#tileBodies[i]);
+      }
+    }
+    this.#tileBodies = [];
+  }
+
   set world(world) {
+    this.#world = world;
     this.entityList.world = world;
-    // const tileset = this.tileset;
-    // if (!tileset) {
-    //   return false;
-    // }
-    // const halfTileSize = Vector.scale(tileset.tileSize, 0.5);
-    // this.tiles.forEachTile((tile, x, y, i) => {
-    //   const shape = this.tileset.geometry(tile);
-    //   if (!shape) {
-    //     return;
-    //   }
-    //   shape.position = Vector.add(
-    //     halfTileSize,
-    //     Vector.mul([x, y], tileset.tileSize),
-    //   );
-    //   const body = world.createBody(shape);
-    //   body.static = true;
-    //   world.addBody(body);
-    //   this.tileGeometry.push(body);
-    // });
+    this.removeTileBodies();
+    this.addTileBodies();
   }
 
 };
diff --git a/packages/physics/src/resources/decorators/layers.js b/packages/physics/src/resources/decorators/layers.js
index f04de17..8086d10 100644
--- a/packages/physics/src/resources/decorators/layers.js
+++ b/packages/physics/src/resources/decorators/layers.js
@@ -1,5 +1,23 @@
 export default (Layers) => class PhysicsLayers extends Layers {
 
+  addLayer(layer) {
+    super.addLayer(layer);
+    layer.on('tile-data-changed', this.onTileDataChanged, this);
+  }
+
+  onTileDataChanged() {
+    const layer = this.layers[1];
+    layer.removeTileBodies();
+    layer.addTileBodies();
+  }
+
+  removeLayer(layer) {
+    if (-1 !== this.layers.indexOf(layer)) {
+      layer.off('tile-data-changed', this.onTileDataChanged);
+    }
+    super.removeLayer(layer);
+  }
+
   set world(world) {
     for (let index = 0; index < this.layers.length; index++) {
       this.layers[index].world = world;