... and ruler constructions
Scatter graphs
Stem and leaf displays
Box plots
Histograms
Pie charts
Simple diagrams.
The structure of each drawing is built from individual components which can be placed on the drawing grid without great accuracy. Each can then be positioned exactly using onscreen buttons. The ruler and the protractor can be aligned with any straight line. Drawings can be created on imported background bitmaps.
The author was a mathematics lecturer at Plymouth University.