How to use Constrained_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
- Insert a new segment constrained
- Insert a polygon as constrained

Persistance

- Save the current triangulation
- Load an existing triangulation
- Load a constraints file
- Save constraints to file

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 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.

Insert a new segment constrained

Left click on the "Input Segment" layer. Be sure there is no layer activated in the 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 specify the source of the segment. Move the mouse to specify the target of the segment. Note that the segment is not defined until you click the second time. You may even zoom in or out when the first segment point was defined. This way you are able to choose exactly where your segment could be. To insert more than one segment, repeat this procedure without deactivating the "Input Segment" layer. To deactivate this layer, just press the arrow button situated on the same toolbar.

Insert a polygon

Left click on the "Input Polygon" layer. Be sure there is no layer activated in the standard toolbar that eat events. To be sure, press the arrow button situated on the standard toolbar. Left click on the drawing area (the black rectangle) to specify the vertices of the polygon. Note that the polygon could not be simple. A right click on the drawing area will close the polygon without introducing a new vertex. The polygon input layer has the same functionality as the segment input layer: you may zoom in or out while you construct your polygon. To insert more than one polygon, repeat the procedure without deactivating the "Input Polygon" layer. To deactivate this layer, just press the arrow button situated on the same toolbar.

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 viewport.

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 application will change the current visible area to fit the bounding box of the triangualtion.

Load a constraints file

Press Ctrl+C combination keys or go to File menu and choose "Load Constraints". A load file dialog will appear, having a filter that displays only the files with "edg" extension. Go to data directory and choose norway.edg, then press "Open" button or hit "Enter" key.
The application will change the current visible area to fit the bounding box of the triangualtion.

Last modified: Wed Jul 2 14:15:52 MEST 2003