Easydrawer - A 2D Geometric Construction Tool

Easydrawer is a graphical computer application which helps users to draw 2D constructions as they would do on a sheet of paper using a pair of compasses, a ruler and a pen. Easydrawer can significantly increase the productivity of geometrical drawers and help in making the construction process transparent to persons who are currently trained in technical drawing. The application comes with some features which specially qualify it for educational use. They are mainly: colorization of primitives, gradually playing back creation-history, entering author’s comments for each construction step, hiding or highlighting construction parts and giving objects a name. Users are able to directly use any paper-construction know-how with this tool. This means that users will not forget how to draw on a sheet of paper. In addition, Easydrawer supports geometric drawers when it comes to quality (exactness in distance and angle measurement, calculating intersections and completely dirt-free constructions), working speed and simplifying their job (blending-out uninteresting parts of the construction or coloring primitives, for example). To cover all constructions which are possible on a sheet of paper, the following primitives and operations are integrated: • Primitives: points, lines, circles, text (as a primitive or as description of other primitives), splines (for free-hand parts as they are needed to draw ellipses or parables, for example) and areas (for shadow simulation). • Operations: intersection of two lines, line and circle or two ∗e-mail: [email protected] circles, changing visibility mode of primitives and coloring primitives.