Several useful constans.

--HG--
branch : develop

src/libs/vdxf/dxflib/dl_codes.h

@@ -39,25 +39,6 @@
     #endif // _MSC_VER > 1000
 #endif // Q_CC_MSVC
 
-#ifdef _WIN32
-#undef M_PI
-#define M_PI   3.14159265358979323846
-QT_WARNING_DISABLE_MSVC(4800)
-#endif
-
-#ifndef M_PI
-#define M_PI   3.14159265358979323846 /* pi */
-#endif
-
-#ifndef M_2PI
-#define M_2PI  6.28318530717958647692 /* 2*pi */
-#endif
-
-#ifndef M_PI_2
-#define M_PI_2 1.57079632679489661923 /* pi/2 */
-
-#endif
-
 #define DL_DXF_MAXLINE 1024
 #define DL_DXF_MAXGROUPCODE 1100
 

src/libs/vgeometry/vabstractcurve.h

@@ -38,15 +38,12 @@
 #include <QtGlobal>
 
 #include "../ifc/ifcdef.h"
+#include "../vmisc/vmath.h"
 #include "vgeometrydef.h"
 #include "vgobject.h"
 
 class QPointF;
 
-#ifndef M_2PI
-#define M_2PI 6.28318530717958647692528676655900576
-#endif
-
 enum class PathDirection : char { Hide, Show };
 
 class QLineF;

src/libs/vmisc/vmath.h

@@ -48,5 +48,33 @@ Q_DECL_CONSTEXPR inline double qRadiansToDegrees(double radians)
 
 #endif // QT_VERSION < QT_VERSION_CHECK(5, 1, 0)
 
+#ifndef M_2PI
+#define M_2PI (6.28318530717958647692) /* 2*pi */
+#endif
+
+#ifndef M_3PI_4
+#define M_3PI_4 (2.35619449019234492884) /* 3*pi/4 */
+#endif
+
+#ifndef M_3PI_8
+#define M_3PI_8 (1.17809724509617246442) /* 3*pi/8 */
+#endif
+
+#ifndef M_PI_8
+#define M_PI_8 (0.39269908169872415480) /* pi/8 */
+#endif
+
+#ifndef M_4_PI
+#define M_4_PI (1.27323954473516268615) /* 4/pi */
+#endif
+
+#ifndef M_1_SQRT2
+#define M_1_SQRT2 (0.70710678118654752440) /* 1/sqrt(2) */
+#endif
+
+#ifndef M_EULER
+#define M_EULER (0.57721566490153286060)
+#endif
+
 #endif // VMATH_H