Symbol: CalcVectorAngle
src/tests/kits/interface/picture/SVGViewView.cpp
702
double theta1 = CalcVectorAngle(1.0, 0.0, (x1dash - cxdash) / rx,
src/tests/kits/interface/picture/SVGViewView.cpp
704
dtheta = CalcVectorAngle((x1dash - cxdash) / rx,