moure source/scenes a source/game/scenes

source/game/scenes/frame_animator.cpp

@@ -0,0 +1,36 @@
+#include "game/scenes/frame_animator.hpp"
+
+#include <algorithm>
+
+namespace scenes {
+
+    FrameAnimator::FrameAnimator(int num_frames, int frame_ms, bool loop)
+        : num_frames_(std::max(1, num_frames)),
+          frame_ms_(std::max(1, frame_ms)),
+          loop_(loop) {}
+
+    void FrameAnimator::tick(int delta_ms) {
+        if (finished_) return;
+        elapsed_ms_ += delta_ms;
+        while (elapsed_ms_ >= frame_ms_) {
+            elapsed_ms_ -= frame_ms_;
+            ++current_frame_;
+            if (current_frame_ >= num_frames_) {
+                if (loop_) {
+                    current_frame_ = 0;
+                } else {
+                    current_frame_ = num_frames_ - 1;
+                    finished_ = true;
+                    return;
+                }
+            }
+        }
+    }
+
+    void FrameAnimator::reset() {
+        current_frame_ = 0;
+        elapsed_ms_ = 0;
+        finished_ = false;
+    }
+
+}  // namespace scenes