tb_animation_utils.h

// ================================================================================
// ==      This file is a part of Turbo Badger. (C) 2011-2014, Emil Segerås      ==
// ==                     See tb_core.h for more information.                    ==
// ================================================================================

#ifndef TB_ANIMATION_UTILS_H
#define TB_ANIMATION_UTILS_H

#include "animation/tb_animation.h"

namespace tb {

// TBAnimatedFloat - A animated float value

class TBAnimatedFloat : public TBAnimationObject
{
public:
    float src_val;
    float dst_val;
    float current_progress;
public:
    // For safe typecasting
    TBOBJECT_SUBCLASS(TBAnimatedFloat, TBAnimationObject);

    TBAnimatedFloat(    float initial_value,
                    ANIMATION_CURVE animation_curve = ANIMATION_DEFAULT_CURVE,
                    double animation_duration = ANIMATION_DEFAULT_DURATION)
        : src_val(initial_value), dst_val(initial_value), current_progress(0)
    {
        TBAnimationObject::animation_curve = animation_curve;
        TBAnimationObject::animation_duration = animation_duration;
    }

    float GetValue() const { return src_val + (dst_val - src_val) * current_progress; }
    void SetValueAnimated(float value) { src_val = GetValue(); dst_val = value; TBAnimationManager::StartAnimation(this, animation_curve, animation_duration); }
    void SetValueImmediately(float value) { TBAnimationManager::AbortAnimation(this, false); src_val = dst_val = value; OnAnimationUpdate(1.0f); }

    virtual void OnAnimationStart() { current_progress = 0; }
    virtual void OnAnimationUpdate(float progress) { current_progress = progress; }
    virtual void OnAnimationStop(bool aborted) {}
};

// TBFloatAnimator - Animates a external float value, which address is given in the constructor.

class TBFloatAnimator : public TBAnimatedFloat
{
public:
    float *target_value;
public:
    // For safe typecasting
    TBOBJECT_SUBCLASS(TBFloatAnimator, TBAnimationObject);

    TBFloatAnimator(    float *target_value,
                    ANIMATION_CURVE animation_curve = ANIMATION_DEFAULT_CURVE,
                    double animation_duration = ANIMATION_DEFAULT_DURATION)
        : TBAnimatedFloat(*target_value), target_value(target_value) {}

    virtual void OnAnimationStart() { TBAnimatedFloat::OnAnimationStart(); *target_value = GetValue(); }
    virtual void OnAnimationUpdate(float progress) { TBAnimatedFloat::OnAnimationUpdate(progress); *target_value = GetValue(); }
};

} // namespace tb

#endif // TB_ANIMATION_UTILS_H