Below this area is are two sets of buttons, Point operations and View controls . The construction area shows a graphical display of the current construction in progress. Allows the user to enter a sequence of points as input to a ruler and compass construction. Drag input Allows the user to move input points within the Construction area. Constructions depending on these points are updated dynamically.
Select output Allows the user to specify shapes as output of the construction.
In, Out Zoom in or out of the construction area. Center Centers and rescales the construction area so that all points are visible. Construction list To the right of the display area is a list of available primitives and constructions. Other constructions can be added to this list when they are defined and loaded from libraries. To apply a primitive or construction, select it by clicking on its name.