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deps/g3dlite/include/G3D/units.h

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+/**
+ @file units.h
+
+ @maintainer Morgan McGuire, http://graphics.cs.williams.edu
+
+ @created 2009-08-21
+ @edited  2009-08-21
+ */
+#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 100.0f;
+}
+
+/** 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;
+}
+
+///////////////////////////////////////////
+
+}
+}
+
+#endif