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124 lines
3.3 KiB
C++
124 lines
3.3 KiB
C++
// Copyright 2022 Arthur Sonzogni. All rights reserved.
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// Use of this source code is governed by the MIT license that can be found in
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// the LICENSE file.
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#ifndef FTXUI_ANIMATION_HPP
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#define FTXUI_ANIMATION_HPP
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#include <chrono> // for milliseconds, duration, steady_clock, time_point
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#include <functional> // for function
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namespace ftxui::animation {
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/// @brief RequestAnimationFrame is a function that requests a new frame to be
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/// drawn in the next animation cycle.
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///
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/// @note This function is typically called by components that need to
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/// update their state or appearance over time, such as animations or
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/// transitions. This is useful when the change doesn't depend depend on the
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/// events seen by the terminal, but rather on the passage of time.
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///
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/// Components who haven't completed their animation can call this function to
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/// request a new frame to be drawn later.
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///
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/// When there is no new events and no animations to complete, no new frame is
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/// drawn.
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///
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/// @ingroup component
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void RequestAnimationFrame();
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using Clock = std::chrono::steady_clock;
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using TimePoint = std::chrono::time_point<Clock>;
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using Duration = std::chrono::duration<float>;
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// Parameter of Component::OnAnimation(param).
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class Params {
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public:
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explicit Params(Duration duration) : duration_(duration) {}
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/// The duration this animation step represents.
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Duration duration() const { return duration_; }
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private:
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Duration duration_;
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};
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namespace easing {
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using Function = std::function<float(float)>;
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// Linear interpolation (no easing)
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float Linear(float p);
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// Quadratic easing; p^2
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float QuadraticIn(float p);
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float QuadraticOut(float p);
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float QuadraticInOut(float p);
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// Cubic easing; p^3
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float CubicIn(float p);
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float CubicOut(float p);
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float CubicInOut(float p);
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// Quartic easing; p^4
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float QuarticIn(float p);
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float QuarticOut(float p);
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float QuarticInOut(float p);
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// Quintic easing; p^5
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float QuinticIn(float p);
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float QuinticOut(float p);
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float QuinticInOut(float p);
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// Sine wave easing; sin(p * PI/2)
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float SineIn(float p);
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float SineOut(float p);
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float SineInOut(float p);
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// Circular easing; sqrt(1 - p^2)
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float CircularIn(float p);
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float CircularOut(float p);
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float CircularInOut(float p);
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// Exponential easing, base 2
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float ExponentialIn(float p);
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float ExponentialOut(float p);
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float ExponentialInOut(float p);
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// Exponentially-damped sine wave easing
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float ElasticIn(float p);
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float ElasticOut(float p);
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float ElasticInOut(float p);
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// Overshooting cubic easing;
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float BackIn(float p);
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float BackOut(float p);
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float BackInOut(float p);
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// Exponentially-decaying bounce easing
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float BounceIn(float p);
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float BounceOut(float p);
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float BounceInOut(float p);
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} // namespace easing
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class Animator {
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public:
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explicit Animator(float* from,
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float to = 0.f,
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Duration duration = std::chrono::milliseconds(250),
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easing::Function easing_function = easing::Linear,
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Duration delay = std::chrono::milliseconds(0));
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void OnAnimation(Params&);
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float to() const { return to_; }
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private:
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float* value_;
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float from_;
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float to_;
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Duration duration_;
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easing::Function easing_function_;
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Duration current_;
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};
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} // namespace ftxui::animation
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#endif /* end of include guard: FTXUI_ANIMATION_HPP */
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