For the visualisation of mathematical graphs one can use special geometric objects like
vertex, edges or the abstract object graph.

In combination with the JavaScript commands document.Geometria.addObject() and document.Geometria.removeObject(), it is possible to realize the interactive construction of mathematical graphs.

Of course, by using same JavaScript programming this could be extended to define a graph by a matrix, copied into a textarea within the web-page. Some JavaScript functions which are used in the following examples can be found here.

Examples for this feature are given here:

• Graph construction sequently
  (Graph given through a number of vertices and sequently defined edges.)
  
  
• Graph construction by matrix
  (Graph is defined through an incidence matrix)
  
  
• Connected graph
  (Excercise with response analysis using the property "isConnected" of a graph object.)
  
  
• Graph construction:
  Add vertices and edges and get the matrix of the graph
  
  
• Graph construction II:
  Matrix --> Geometria --> Matrix (only for testing purpose)
  
  
• RemoveObject
  Example: How to remove constructed objects