1 files changed, 50 insertions, 0 deletions
diff --git a/plug-ins/map-object/arcball.h b/plug-ins/map-object/arcball.h
new file mode 100644
index 0000000..f0b56ce
--- /dev/null
+++ b/plug-ins/map-object/arcball.h
@@ -0,0 +1,50 @@
+#ifndef __ARCBALL_H__
+#define __ARCBALL_H__
+
+typedef struct
+{
+  double x, y, z, w;
+} Quat;
+
+enum QuatPart
+{
+  X,
+  Y,
+  Z,
+  W,
+  QuatLen
+};
+
+typedef Quat HVect;
+
+typedef double HMatrix[QuatLen][QuatLen];
+
+typedef enum AxisSet
+{
+  NoAxes,
+  CameraAxes,
+  BodyAxes,
+  OtherAxes,
+  NSets
+} AxisSet;
+
+typedef double *ConstraintSet;
+
+extern Quat qOne;
+
+void ArcBall_Init      (void);
+void ArcBall_Place     (HVect    Center,
+                        double   Radius);
+void ArcBall_UseSet    (AxisSet  axis_Set);
+void ArcBall_Update    (void);
+void ArcBall_Value     (HMatrix  m_Now);
+void ArcBall_Values    (double  *alpha,
+                        double  *beta,
+                        double  *gamma);
+void ArcBall_BeginDrag (void);
+void ArcBall_EndDrag   (void);
+void ArcBall_Mouse     (HVect    v_Now);
+void ArcBall_CopyMat   (HMatrix  inm,
+                        HMatrix  outm);
+
+#endif /* __ARCBALL_H__ */