From c055eeef6d41269d11b2ddf7f9aba6f8867da65d Mon Sep 17 00:00:00 2001
From: Nikita Kostovsky <nikita@kostovsky.me>
Date: Tue, 23 Dec 2025 15:28:05 +0100
Subject: initial commit

---
 core/src/cpp/animation.cpp | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 core/src/cpp/animation.cpp

(limited to 'core/src/cpp/animation.cpp')

diff --git a/core/src/cpp/animation.cpp b/core/src/cpp/animation.cpp
new file mode 100644
index 0000000..fbda115
--- /dev/null
+++ b/core/src/cpp/animation.cpp
@@ -0,0 +1,37 @@
+#include "animation.h"
+
+Animation::Animation(
+    SDL_Renderer* renderer,
+    const std::string& filename,
+    const int width,
+    const double durationS,
+    const bool repeat
+)
+    : Sprite{renderer, filename, width}
+    , durationS{durationS}
+    , repeat{repeat}
+{
+}
+
+bool Animation::animation_ended(const TimeStamp timestamp) const
+{
+    double elapsed = std::chrono::duration<double>(Clock::now() - timestamp)
+                         .count();  // seconds from timestamp to now
+    return !repeat && elapsed >= durationS;
+}
+
+int Animation::frame(const TimeStamp timestamp) const
+{
+    // seconds from timestamp to now
+    double elapsed =
+        std::chrono::duration<double>(Clock::now() - timestamp).count();
+    // FIXME: division by zero
+    int idx = static_cast<int>(nframes * elapsed / durationS);
+
+    return repeat ? idx % nframes : std::min(idx, nframes - 1);
+}
+
+SDL_Rect Animation::rect(const TimeStamp timestamp) const
+{
+    return {frame(timestamp) * width, 0, width, height};
+}
-- 
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