scenes: infraestructura de la capa scenes:: (scene, timeline, sprite mover, frame animator, palette fade, surface handle, registry)

source/scenes/frame_animator.cpp

@@ -0,0 +1,36 @@
+#include "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