How to use Triangulation_2 Demo

Main Functionality

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

Editing

- Generate Delaunay triangulation
- Insert a new vertex
- Delete existing vertex
- Move existing vertex
- Input a line to display line_walk

Persistance

- Save the current triangulation
- Load an existing triangulation

Reset application

Press Ctrl+N combination keys or go to File menu and choose "New". The triangulation will be erased, the window's viewport 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 viewport to make the triangulation 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.

Generate Delaunay triangulation

To generate a Delaunay triangulation, go to Edit menu and choose "Generate Triangulation" button, or press Ctrl+G combination keys. Each time you generate the triangulation, the old one will be erased.

Insert a new vertex

Left click on the "Input point" layer. Be sure there is no layer activated in standard toolbar that eat events. To be sure, press the arrow button situated on the standard toolbar. Left Click anywhere on the application's drawing area (the black rectangle) to insert the vertex. The vertex is inserted in the triangulation. To see the conflict zone keep the left mouse button pressed. The vertex is inserted when you release the button.

To insert more than one vertex, keep clicking on the rectangle without deactivating the "Input point" layer. To deactivate this layer, just press the arrow button situated on the same toolbar.

Delete an existing vertex

(1)Left click on the "Move/Delete vertex" layer. If the "Input point" layer was active, it will deactivate itself. (2)Right click on the drawing area (the black rectangle) near an existing vertex. A popup menu will apear and the selected vertex will be highlighted. If the popup doesn't appear, press the arrow button on the "standard toolbar" to deactivate all layers that could eat the events. (3)Choose "Delete". The vertex will be removed from the triangulation. To delete more than one vertex, repeat the process from (2) to (3). To deactivate this layer, just press the arrow button situated on the same toolbar.

Move existing vertex

(1)Left click on the "Move/Delete vertex" layer. If the "Input point" or "Input line" layer was active, it will deactivate itself. (2)Right click on the drawing area (the black rectangle) near an existing vertex. A popup menu will apear and the selected vertex will be highlighted. (3)Choose "Move". From this moment, the vertex will move as you move the mouse. The triangulation will reflect the changes. (4)Left click on the drawing area will position the vertex at the mouse coordinates. You may repeat the process from the step (2) to (4). To deactivate this layer, just press the arrow button situated on the same toolbar.

Input line to display the line_walk

Left Click on the "Input Line" layer. If the "Input point" or "Move/Delete vertex" layer was active, it will deactivate itself. Lef click on the drawing area to define the first point of the line. Move the mouse where you want the second point be situated. As you move the mouse you will see a line defined by the first point and the point situated at mouse coordinates. Click the left mouse button. The final line will be displayed and you can see the result of the line walk alghoritm, the triangles intersected by this line will be highlighted on the screen.

Save the current triangulation

Press Ctrl+S combination keys or go to File menu, then choose "Save Triangulation". A save file dialog will appear, the default name given is "triangulation.cgal". You may change the name then press "Save" or hit "Enter" key. To cancel the save process just press Esc key.
The triangulation saved does not contain the visible area.

Load an existing triangulation

Press Ctrl+L combination keys or go to File menu and choose "Load Triangulation". A load file dialog will appear, having a filter that displays only the files with "cgal" extension. Choose a file then press "Open" button or hit "Enter" key.
The triangulation saved does not contain the visible area. The application will change the current visible area to fit the bounding box of the triangualtion.

Last modified: Fri May 16 11:46:03 MEST 2003