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orxVECTOR dotPosition;
orxVector_Set( &dotPosition, 0, 0, 0 );
orxSTATUS status = orxDisplay_DrawCircle( &dotPosition, orxFLOAT(100), orx2RGBA(0xFF, 0x00, 0x00, 0xFF), orxTRUE);
Comments
As previously mentioned here, you can listen to the render events in order to have your calls issued before any rendering or after everything has been rendered.
If you need to do it as a certain "depth", you can listen to the orxRENDER_EVENT_OBJECT_START event, issue your draw calls from the event handler and return orxSTATUS_FAILURE to prevent orx from doing any rendering for that specific object.
Also note that the primitive are drawn in screen space, (0, 0) being the top left corner and (ScreenWidth, ScreenHeight) being the bottom right corner. If you need to transform a world coordinate into a space one, you can use orxRender_GetScreenPosition() to that effect.