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/**
\file G3D/units.h
\maintainer Morgan McGuire, http://graphics.cs.williams.edu
\created 2009-08-21
\edited 2011-07-08
*/
#ifndef G3D_units_h
#define G3D_units_h
#include "G3D/platform.h"
namespace G3D {
/** Use <code>using namespace G3D::units;</code> to include all units
into your program. The units system is specifically designed not to
be general but to support commonly used units efficiently and
clearly. See http://en.wikipedia.org/wiki/SI_prefix for interesting facts
about SI/metric units and full definitions.*/
namespace units {
/** 1e-9 m */
inline float nanometers() {
return 1e-9f;
}
/** 1e-6 m */
inline float micrometers() {
return 1e-6f;
}
/** 0.001 m */
inline float millimeters() {
return 0.001f;
}
/** 0.01 m */
inline float centimeters() {
return 0.01f;
}
/** SI base unit of distance measure. */
inline float meters() {
return 1.0f;
}
/** 1000 m */
inline float kilometers() {
return 1000.0f;
}
/** 0.0254 m */
inline float inches() {
return 0.0254f;
}
/** 0.3048 m */
inline float feet() {
return 0.3048f;
}
/** 0.9144 m */
inline float yards() {
return 0.9144f;
}
/** 1609.344 m */
inline float miles() {
return 1609.344f;
}
/////////////////////////////////////////////////////////////
/** SI base unit of angular measure. */
inline float radians() {
return 1.0f;
}
/** pi/180 */
inline float degrees() {
return 0.0174532925f;
}
//////////////////////////////////////////////////////////////
/** 1e-9 s */
inline float nanoseconds() {
return 1e-9f;
}
/** 1e-3 s */
inline float milliseconds() {
return 1e-3f;
}
/** Base unit of time */
inline float seconds() {
return 1.0;
}
/** 60 s */
inline float minutes() {
return 60.0f;
}
/** 3600 s */
inline float hours() {
return 3600.0f;
}
/** 86400 s */
inline float days() {
return 86400.0f;
}
/** 31556926 s */
inline float years() {
return 31556926.0f;
}
///////////////////////////////////////////
/** SI unit of mass */
inline float kilograms() {
return 1.0f;
}
///////////////////////////////////////////
/** 1 kg m / s^2 */
inline float newtons() {
return 1.0f;
}
///////////////////////////////////////////
/** SI unit of power: W = J/s*/
inline float watts() {
return 1.0;
}
/** SI unit of energy: J = N*m */
inline float joules() {
return 1.0;
}
/** Unit of solid angle measure. A sphere subtends 4 * pi sr. */
inline float steradians() {
return 1.0;
}
} // units
} // G3D
#endif
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