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

source/scenes/sprite_mover.cpp

@@ -0,0 +1,46 @@
+#include "scenes/sprite_mover.hpp"
+
+#include <algorithm>
+
+namespace scenes {
+
+void SpriteMover::moveTo(int x0, int y0, int x1, int y1, int duration_ms, EaseFn ease) {
+    x0_ = x0;
+    y0_ = y0;
+    x1_ = x1;
+    y1_ = y1;
+    duration_ms_ = std::max(0, duration_ms);
+    elapsed_ms_ = 0;
+    ease_ = ease ? ease : Easing::linear;
+    cur_x_ = x0;
+    cur_y_ = y0;
+}
+
+void SpriteMover::setPosition(int x, int y) {
+    cur_x_ = x;
+    cur_y_ = y;
+    x0_ = x1_ = x;
+    y0_ = y1_ = y;
+    duration_ms_ = 0;
+    elapsed_ms_ = 0;
+}
+
+void SpriteMover::tick(int delta_ms) {
+    if (duration_ms_ <= 0) {
+        cur_x_ = x1_;
+        cur_y_ = y1_;
+        return;
+    }
+    elapsed_ms_ = std::min(elapsed_ms_ + delta_ms, duration_ms_);
+    const float t = static_cast<float>(elapsed_ms_) / static_cast<float>(duration_ms_);
+    const float eased = ease_(t);
+    cur_x_ = Easing::lerpInt(x0_, x1_, eased);
+    cur_y_ = Easing::lerpInt(y0_, y1_, eased);
+}
+
+float SpriteMover::progress() const {
+    if (duration_ms_ <= 0) return 1.0f;
+    return static_cast<float>(elapsed_ms_) / static_cast<float>(duration_ms_);
+}
+
+}  // namespace scenes