Drawmetry.com

This drawing is an illustration of a problem from descriptive geometry. Given a line and a point off the line, draw the cube that has two opposite corners on the given line and a corner at the given point. The problem has two solutions, one of which is shown here. The two projections of the given line are shown in red, and the two projections of the given point are surrounded by a small circle. The two colored cubes are the two projections of the solution of the problem
The free points may be dragged (for instance the given line and point may be moved) and the solution will be updated automatically.

Drawmetry file: 

Cube.svg