pline: If[isDiameter, a1, If[isIdeal, a3, a2]]
We are finally ready to create a custom tool for creating hyperbolic
lines in the Poincaré model. Be sure to hide all of the objects except
A , B and pline. For pline, it is best to
turn off the label. Then go to the main menu in GeoGebra and select
Tools/Create New Tool. In the Output Objects tab, use the drop-down menu
to select pline.