BCGControlBar Pro for MFC
void CBCGPComplexGeometry::AddArc ( const CBCGPPoint pt,
const CBCGPSize  szRadius,
BOOL  bIsClockwise = TRUE,
BOOL  bIsLargeArc = FALSE,
double  dblRotationAngle = 0. 

Adds an arc segment to the geometry.

ptThe arc end point.
szRadiusThe arc radius.
bIsClockwiseTRUE if arc is clockwise.
bIsLargeArcTRUE if the arc is large (more than 180 degrees).
dblRotationAngle(optional) The arc rotation angle.