12.1 Useful macros: add functionality to Archimedes

Let´s assume you often need the perpendicular bisector plane of two points. This can be easily constructed:

• start with points P1 and P2
• construct the midpoint (mark P1 and P2 and press the point-button)
• construct the vector from the midpoint to one of the other points
• construct the plane by marking the midpoint and the vector.

Using P1 and P2 as a basis, the other objects were constructed. If you select those points and choose ’Macro - mark as given’ these objects are taken as the base-objects of the macro.

Save the macro (as ’MacroBisectorPlane.geosave, for instance) so that you can use it later on.

If you start a new construction and select two points, you can now use ’Macro - play’ and select the macro you have just made. The bisector appears - but the midpoint and the vector appear, too.

If you do not want supplementary objects to appear in the scene, you will have to hide them in the macro.