Initial commit

src/main/java/se/urmo/game/state/CollisionChecker.java

@@ -0,0 +1,39 @@
+package se.urmo.game.state;
+
+import se.urmo.game.GameMap;
+
+public class CollisionChecker {
+    private GameMap map;
+
+    public CollisionChecker(GameMap map) {
+        this.map = map;
+    }
+
+    public boolean canMoveTo(int dir, int objectLeft, int objectTop, int width, int height) {
+        int objectRight = objectLeft + width;
+        int objectBotton = objectTop + height;
+        return switch (dir){
+            case 0 -> isPassibleRight(objectRight, objectTop, objectBotton);// right
+            case 1 -> isPassibleLeft(objectLeft, objectTop, objectBotton);// right
+            case 2 -> isPassibleBottom(objectLeft, objectRight, objectBotton);
+            case 3 -> isPassibleTop(objectLeft, objectRight, objectTop);// right
+            default -> throw new IllegalArgumentException("Invalid dir: " + dir);
+        };
+    }
+
+    private boolean isPassibleBottom(int objectLeft, int objectRight, int objectBotton) {
+        return map.isPassable(objectLeft, objectBotton) && map.isPassable(objectRight, objectBotton);
+    }
+
+    private boolean isPassibleTop(int objectLeft, int objectRight, int objectTop) {
+        return map.isPassable(objectLeft, objectTop) && map.isPassable(objectRight, objectTop);
+    }
+
+    private boolean isPassibleLeft(int objectLeft, int objectTop, int objectBotton) {
+        return map.isPassable(objectLeft, objectTop) && map.isPassable(objectLeft, objectBotton);
+    }
+
+    private boolean isPassibleRight(int objectRight, int objectTop, int objectBotton) {
+        return map.isPassable(objectRight, objectTop) && map.isPassable(objectRight, objectBotton);
+    }
+}