1 files changed, 23 insertions, 1 deletions

@@ -17,4 +17,26 @@ void Game::moveSprite(int id, vec2i newLoc) {
   if (changedY) {
     spritesByY_.emplace(newLoc.y(), id);
   }
-}
\ No newline at end of file
+}
+
+void Game::tick() {
+  if (!cameraLocked_) {
+    const Sprite& follow = getSprite(followingSprite_);
+    vec2i mapBounds = map_->getMapSize() * map_->getTileSize();
+
+    cameraPos_ = follow.loc() - (cameraFov_ / 2);
+
+    if (cameraPos_.x() < 0) {
+      cameraPos_.x() = 0;
+    }
+    if (cameraPos_.y() < 0) {
+      cameraPos_.y() = 0;
+    }
+    if (cameraPos_.x() + cameraFov_.w() >= mapBounds.w()) {
+      cameraPos_.x() = mapBounds.w() - cameraFov_.w() - 1;
+    }
+    if (cameraPos_.y() + cameraFov_.h() >= mapBounds.h()) {
+      cameraPos_.y() = mapBounds.h() - cameraFov_.h() - 1;
+    }
+  }
+}