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Add math/Misc.h

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Tomas Jakobsson 2017-11-06 11:46:15 +01:00
parent e37db2c2e0
commit dbdf6ed054
2 changed files with 63 additions and 1 deletions
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3
es-core/src/GuiComponent.h
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@ -2,6 +2,7 @@
#ifndef ES_CORE_GUI_COMPONENT_H
#define ES_CORE_GUI_COMPONENT_H
#include "math/Misc.h"
#include "math/Transform4x4f.h"
#include "HelpPrompt.h"
#include "HelpStyle.h"
@ -62,7 +63,7 @@ public:
float getRotation() const;
void setRotation(float rotation);
inline void setRotationDegrees(float rotation) { setRotation((float) (rotation * M_PI / 180)); }
inline void setRotationDegrees(float rotation) { setRotation((float)ES_DEG_TO_RAD(rotation)); }
float getScale() const;
void setScale(float scale);

61
es-core/src/math/Misc.h Normal file
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@ -0,0 +1,61 @@
#pragma once
#ifndef ES_CORE_MATH_MISC_H
#define ES_CORE_MATH_MISC_H
#include <math.h>
#define ES_PI (3.1415926535897932384626433832795028841971693993751058209749445923)
#define ES_RAD_TO_DEG(x) ((x) * (180.0 / ES_PI))
#define ES_DEG_TO_RAD(x) ((x) * (ES_PI / 180.0))
namespace Math
{
inline float scroll_bounce(const float delayTime, const float scrollTime, const float currentTime, const int scrollLength)
{
if(currentTime < delayTime)
{
// wait
return 0;
}
else if(currentTime < (delayTime + scrollTime))
{
// lerp from 0 to scrollLength
const float fraction = (currentTime - delayTime) / scrollTime;
return (float)(((1.0 - cos(ES_PI * fraction)) * 0.5) * scrollLength);
}
else if(currentTime < (delayTime + scrollTime + delayTime))
{
// wait some more
return scrollLength;
}
else if(currentTime < (delayTime + scrollTime + delayTime + scrollTime))
{
// lerp back from scrollLength to 0
const float fraction = 1.0 - (currentTime - delayTime - scrollTime - delayTime) / scrollTime;
return (float)(((1.0 - cos(ES_PI * fraction)) * 0.5) * scrollLength);
}
// and back to waiting
return 0;
}
inline float scroll_loop(const float delayTime, const float scrollTime, const float currentTime, const int scrollLength)
{
if(currentTime < delayTime)
{
// wait
return 0;
}
else if(currentTime < (delayTime + scrollTime))
{
// lerp from 0 to scrollLength
const float fraction = (currentTime - delayTime) / scrollTime;
return fraction * scrollLength;
}
// and back to waiting
return 0;
}
}
#endif // ES_CORE_MATH_MISC_H