/*!

\page tui_angle_page Angle

\code
import salome
salome.salome_init()

import math
import geompy
geompy.init_geom(salome.myStudy)

OX  = geompy.MakeVectorDXDYDZ(10, 0,0)
OXY = geompy.MakeVectorDXDYDZ(10,10,0)

# in one plane
Angle = geompy.GetAngle(OX, OXY)

print "\nAngle between OX and OXY = ", Angle
if math.fabs(Angle - 45.0) > 1e-05:
    print "  Error: returned angle is", Angle, "while must be 45.0"
    pass

Angle = geompy.GetAngleRadians(OX, OXY)

print "\nAngle between OX and OXY in radians = ", Angle
if math.fabs(Angle - math.pi/4) > 1e-05:
    print "  Error: returned angle is", Angle, "while must be pi/4"
    pass

# not in one plane
OXY_shift = geompy.MakeTranslation(OXY,10,-10,20)
Angle = geompy.GetAngle(OX, OXY_shift)

print "Angle between OX and OXY_shift = ", Angle
if math.fabs(Angle - 45.0) > 1e-05:
    print "  Error: returned angle is", Angle, "while must be 45.0"
    pass

# not linear
pnt1 = geompy.MakeVertex(0, 0, 0)
pnt2 = geompy.MakeVertex(10, 0, 0)
pnt3 = geompy.MakeVertex(20, 10, 0)
arc  = geompy.MakeArc(pnt1, pnt2, pnt3)
Angle = geompy.GetAngle(OX, arc)

if (math.fabs(Angle + 1.0) > 1e-6 or geompy.MeasuOp.IsDone()):
    print "Error. Angle must not be computed on curvilinear edges"
    pass

\endcode

*/