How to draw a circle in Xmgrace

Question

How to draw a circle in Xmgrace with center in (x,y) and diameter d? One way is to create sets from two functions. For example, -(1-x^2)^0.5 and (1-x^2)^0.5, but are there alternatives?

Answer 1

Using the GUI

1. In the menu bar, go to Window > Drawing objects > Ellipse.
2. Draw any ellipse in the plotting area.
3. Click Edit object and select the ellipse.
4. In the new window, change
   • Position in to World Coordinates.
   • Xcenter to the value of x.
   • Ycenter to the value of y.
   • Width to d.
   • Height to d.
5. Click Accept.

From a batch file

Save this batch.xmg:

WITH ELLIPSE 0
ELLIPSE ON
ELLIPSE LOCTYPE WORLD
ELLIPSE 0,0,1,1
ELLIPSE DEF

The ELLIPSE 0,0,1,1 line defines the x0,y0,x1,y1 of the circle. So that is a circle centered in (0.5, 0.5) and of diameter 1.

Now execute

xmgrace -nosafe -batch batch.xmg