Polygon Editor

This is a Polygon Editor embedded in the page and is edited by javascript. 

Function:

Press "D" to start the new drawing.

Press "ESC" to create polygon after drawing at least 3 points

Press "V" to modify the exist polygon and Press"ESC" to quit the editing mode.

Press "S" to validate whether the polygon is convex or there are lines that are interescted with each other. And then download the data of the polygon (forbidden in this page).

Only could be used when user have finished editing or creating the polygon. 

 

Link to see the codes