diff --git a/projects/mtg/include/Easing.h b/projects/mtg/include/Easing.h new file mode 100644 index 000000000..130290d5e --- /dev/null +++ b/projects/mtg/include/Easing.h @@ -0,0 +1,72 @@ +#ifndef _EASING_H_ +#define _EASING_H_ + +//see http://www.gizma.com/easing/ for more information +class Easing +{ +public: + float start_value; + float delta_value; + float value; + float duration; + float time_acc; + + + Easing(float val): start_value(val), delta_value(0), value(val), duration(0), time_acc(0) + {} + + void reset(){ value = start_value; time_acc = 0;} + void finish(){ value = start_value + delta_value; time_acc = 0; duration = 0;} + virtual void update(float dt) = 0; + + void start(float targetValue, float _duration){ + start_value = value; + delta_value = targetValue - start_value; + time_acc = 0; + duration = _duration; + } + + void translate(float delta_value){ + start_value += delta_value; + value += delta_value; + } + + bool finished() + { + return time_acc >= duration; + } +}; + +class InOutQuadEasing : public Easing +{ +public: + InOutQuadEasing(float val): Easing(val) {} + + void update(float dt){ + if(duration > 0){ + time_acc += dt; + + if(time_acc > duration) + { + time_acc = duration; + value = start_value + delta_value; + } + else + { + float time_tmp = time_acc * 2 / duration; + if (time_tmp < 1) + { + value = delta_value/2*time_tmp*time_tmp + start_value; + } + else + { + time_tmp -= 1; + value = -delta_value/2 * (time_tmp*(time_tmp-2) - 1) + start_value; + } + } + } + } +}; + + +#endif //_EASING_H_