Initial commit

Tween.h

@@ -0,0 +1,104 @@
+#pragma once
+#include "Easing.h"
+// namespace TweenNameSpace {
+typedef float(*eFunc)(float);
+// };
+// using namespace TweenNameSpace;
+
+typedef float(*eFunc)(float);
+class Tween {
+
+  ///////
+private:
+  static inline Tween* head = nullptr;
+  static inline Tween* last = nullptr;
+  static inline uint32_t frameRateTimer;
+  Tween* next;
+public:
+  static void tick() {
+    Tween* current = Tween::head;
+    while (current != nullptr) {
+      current->update();
+      current = current->next;
+    }
+  }
+
+  Tween(uint16_t fps) {
+    frameTime = 1000 / fps;
+    if (Tween::head == nullptr) {
+      Tween::head = this;
+    }
+    if (last != nullptr) {
+      last->next = this;
+    }
+    last = this;
+  }
+  ///////
+
+private:
+  uint16_t frameTime;
+  float dt;
+  uint32_t oldMillis;
+  static float lerp(float a, float b, float t) {
+    return a + (b - a) * t;
+  }
+
+  float from;
+  float to;
+  float duration;
+  eFunc easing = nullptr;
+  float progress;
+  bool isPlayingF;
+
+public:
+  void update() {
+    if (!isPlayingF || easing == nullptr) return;
+    if (millis() - frameRateTimer > frameTime) {
+      frameRateTimer = millis();
+      dtTick();
+      if (current == to || progress >= duration) { stop(); return; }
+      current = clamp(Tween::lerp(from, to, easing(progress / duration)), from, to);
+      progress = progress + Tween::dt;
+    }
+  }
+  float current;
+
+  void dtTick() {
+    uint32_t loopStartTime = millis();
+    dt = (loopStartTime - oldMillis) / 1000.0;
+    oldMillis = loopStartTime;
+  }
+
+  void start(float from, float to, uint16_t duration, eFunc easing) {
+    if (from == to) { return; }
+    this->from = from;
+    this->to = to;
+    this->duration = duration / 1000.0;
+    this->easing = easing;
+    resetToStart();
+    dtTick();
+    isPlayingF = true;
+  }
+
+  void resetToStart() {
+    progress = 0;
+  }
+  void stop() {
+    isPlayingF = false;
+  }
+
+  bool isPlaying() {
+    return isPlayingF;
+  }
+private:
+  int clamp(int value, int a, int b) {
+    if (a > b) {
+      a ^= b;
+      b ^= a;
+      a ^= b;
+    }
+    if (value < a) return a;
+    else if (value > b) return b;
+    else return value;
+  }
+};