Terrain collision.

js/retro/RetroArchitecture.js

@@ -1,6 +1,7 @@
 import RetroSprite from "./RetroSprite.js";
 import RetroArchitectureTile from "./RetroArchitectureTile.js";
 import GeometryRectCollection from "../geometry/GeometryRectCollection.js";
+import GeometryPoint from "../geometry/GeometryPoint.js";
 
 export default class RetroArchitecture
 {
@@ -67,10 +68,10 @@ export default class RetroArchitecture
         return false;
     }
 
-    getTileForPosition(position)
+    getTileForPosition(position, offsetX = 0, offsetY = 0)
     {
-        let x = parseInt(position.x / this.tileWidth);
-        let y = parseInt(position.y / this.tileHeight);
+        let x = parseInt(position.x / this.tileWidth) + offsetX;
+        let y = parseInt(position.y / this.tileHeight) + offsetY;
 
         if (x < 0 || x >= this.columns || y < 0 || y >= this.rows) {
             return null;
@@ -79,13 +80,28 @@ export default class RetroArchitecture
         return {x: x, y: y};
     }
 
+    getCeilingHeight(position)
+    {
+        let tilePosition = this.getTileForPosition(position, 0);
+
+        while (tilePosition !== null && tilePosition.y > 0) {
+            if (this.matrix[tilePosition.y][tilePosition.x] !== null) {
+                return tilePosition.y * this.tileHeight + this.tileHeight;
+            }
+
+            tilePosition.y--;
+        }
+
+        return 0;
+    }
+
     getGroundHeight(position)
     {
         let tilePosition = this.getTileForPosition(position);
 
         while (tilePosition !== null && tilePosition.y < this.rows) {
             if (this.matrix[tilePosition.y][tilePosition.x] !== null) {
-                return tilePosition.y * this.tileHeight
+                return tilePosition.y * this.tileHeight;
             }
 
             tilePosition.y++;
@@ -94,6 +110,36 @@ export default class RetroArchitecture
         return this.tileHeight * this.rows;
     }
 
+    getWallRight(position)
+    {
+        let tilePosition = this.getTileForPosition(new GeometryPoint(position.x, position.y), 1, -1);
+
+        while (tilePosition !== null && tilePosition.x < this.columns) {
+            if (this.matrix[tilePosition.y][tilePosition.x] !== null) {
+                return tilePosition.x * this.tileWidth - this.tileWidth * 0.5;
+            }
+
+            tilePosition.x++;
+        }
+
+        return this.tileWidth * this.columns;
+    }
+
+    getWallLeft(position)
+    {
+        let tilePosition = this.getTileForPosition(new GeometryPoint(position.x, position.y), -1,-1);
+
+        while (tilePosition !== null && tilePosition.x > 0) {
+            if (this.matrix[tilePosition.y][tilePosition.x] !== null) {
+                return tilePosition.x * this.tileWidth + this.tileWidth * 1.5;
+            }
+
+            tilePosition.x--;
+        }
+
+        return 0;
+    }
+
     draw(context)
     {
         for (let y = 0; y < this.rows; y++) {