In 4D Draw emulation mode, that is for areas of type _4DDraw, clicking with the mouse in Special click mode sets a new 4D Draw coordinate origin. This also works when the rulers are not displayed.
In 4D CAD modes, the purpose of special click mode is application specific. Typical examples are
Dependent on the setting of
theSpecialClickModeModifiers parameter of
CADSetAreaPrefs, you can
In 4D CAD modes, implementation is left to the application developer (see
kCADEventIDSpecialClick and CAD events and
for example code the EDtCEvent method in DemoCAD).