Ellipse Commands - Scanlab RTC6 PCIe Board Installation And Operation Manual

Ellipse Commands

The RTC6 command set also provides commands for
marking elliptical arcs.
Here (unlike marking of vectors or circular arcs), you
generally need to call two commands:
well as mark_ellipse_abs
By set_ellipse the arc shape is specified, see
Figure 33:
• Lengths a and b of the ellipse half-axes
• The beginning phase angle Phi0 (and thereby the
arc starting point position relative to the end
point of half-axis a)
• The arc angle Phi (and thereby the length of the
to-be-marked ellipse section)
By mark_ellipse_abs or mark_ellipse_rel, position
and orientation of the to-be-executed arc is specified,
see Figure 33:
• The coordinates (X,Y) of the ellipse midpoint
• The angle Alpha between the ellipse half-axis a
and the x axis
y
3
Alpha
Legend
1 Starting point
2 Marked arc
3 End point
Marking ellipse-shaped arcs.
(1) For using abs and rel commands, see
""AbsCalls"", page 114.
RTC6 boards
Doc. Rev. 1.0.21 en-US
7 Basic Functions for Scan Head Control and Laser Control
set_ellipse as
(1)
or mark_ellipse_rel .
a
b
Phi0
(X,Y)
1
Phi
2
x
33
Section
Notes
• By a, you can specify either the short or long half-
axis (then use b for the other axis). Phi0, Phi and
Alpha are always relative to axis a.
• Phi0 and Phi are counted positively clockwise (in
contrast to mathematical convention). In
contrast, Alpha is counterclockwise (in
accordance with mathematical convention).
• As with Mark Commands
the laser focus moves with the specified
mark speed along the specified arc when the
Ellipse command is executed. The
"Laser Active" Operation
switched on at the beginning of an
"Arc" Command, see also
page 137.
• set_ellipse is a short list command, see also
Section "Normal, Short, Variable and Multiple
List Commands", page
called between a Mark Command
Ellipse command without thereby interrupting
the Polyline (the laser remains on).
• Ellipse Commands always begin marking at the
starting point determined by the above-
mentioned parameters (in contrast to
Mark Commands and
automatically begin marking at the current
output position). If the starting point and current
position do not match, then a
starting point is executed at the beginning of
marking (without a Jump Delay
effective).
and Arc Commands,
Signals for
are automatically
Section "Polylines",
302. Therefore, it can be
and an
Arc Commands which
Hard Jump to the
becoming
138