Robustness

How to use Robustness Demo

Main Functionality

- Reset application
- Creating a new window
- Print
- Close the current window
- Quit the application

Editing

- Convex Hull of intersection points
- Intersection points on segments

Reset application

Press Ctrl+N combination keys or go to File menu and choose "New". The points list will be erased, the window's visible area will be set to default. (-1, 1, -1, 1)

Create a new window

Press Ctrl+W combination keys or go to File menu and choose "New Window". A new window will appear, modifying the visible area to make the points list fit in the new window.

Print

Press Ctrl+P combination keys or go to File menu and choose "Print". The visible area on the screen will be outputed to the print device of your choice.

Close the current window

Press Ctrl+X combination keys or go to File menu and choose "Close". You may do it for any window other than the initial one, this operation will close only the one you have choosen. If you do this for the initial parent window, it will close the others too.

Quit the application

Press Ctrl+Q combination keys or go to File menu and choose "Quit". When you quit the application, all the windows you have created will be destroyed.

Convex Hull of intersection points

Press Ctrl+H combination keys or go to Draw menu and choose "Convex Hull of intersection points". This action will generate 100 segments in (-1, 1, -1, 1) interval. The intersection points are computed and the convex hull of those. You can see the extreme points as white crosses. The computation is done twice, using double arithmetic and exact arithmetic. If there are point that are not well computed using double, they are surrounded by a red circle.

Last modified: Thu Jul 10 10:50:31 MEST 2003