BCGSuite for MFC
void CBCGPCircularGaugeImpl::RotateScale ( double  dblDelta,
int  nScale = 0,
UINT  uiAnimationTime = 100,
CBCGPAnimationManager::BCGPAnimationType  animationType = CBCGPAnimationManager::BCGPANIMATION_Linear 

Rotate the circular gauge's scale to the specific angle.

dblDeltaSpecifies the angle difference, in degrees.
nScaleZero-based scale index.
uiAnimationTimeAnimation time. Set this value to 0 in order to avoid animation effect. Otherwise, the scale will be rotated to a new angle smoothly.
animationTypeType of the animation.