Rockwell Automation 5370-CVIM2 Module - Manual (Page 210)

5 Chapter Chapter 6
Reference Tools
6–51
•
Theta –– When a two–feature reference window tool is used, this returns
the nominal or “learned” value of the rotation angle, in degrees, between
a line connecting the centers of the two features, and the X–axis of the
image field. When one feature is used, theta returns
0.000 .
• nX –– This returns the change from the nominal or “learned” X
coordinate of the principal reference point.
• nY –– This returns the change from the nominal or “learned” Y
coordinate of the principal reference point.
• nTheta –– This returns the change from the nominal or “learned” value
of the rotation angle, in degrees, between a line connecting the centers of
the two features, and the X–axis of the image field. When one feature is
used,
nTheta returns
0.000 .
•
Xc –– This returns the current X coordinate of the center of the feature
when one feature is used, or the midpoint between the centers of the two
features when two features are used.
•
Yc –– This returns the current Y coordinate of the center of the feature
when one feature is used, or the midpoint between the centers of the two
features when two features are used.