The Arc data structure. This data structure contains the origin, first and second vector of the arc coordinate system, the start and end angle, and radius of the arc.

ProArcdataGet(), ProArcdataInit()

ProCurvedataAlloc(), ProCurvedataArrayFree(), ProCurvedataFree(), ProCurvedataMemoryFree(), ProCurvedataTypeGet()

ProGeomitemdataFree(), ProGeomitemdataGet()