[Gambas-devel] [Gambas-devel-svn] SF.net SVN: gambas:[6372] gambas/trunk/main/lib/data

Tobias Boege tobias at ...692...
Sat Jul 12 02:30:58 CEST 2014

On Sat, 12 Jul 2014, tobiasboe at ...1... wrote:
> Revision: 6372
>           http://sourceforge.net/p/gambas/code/6372
> Author:   tobiasboe
> Date:     2014-07-12 00:20:35 +0000 (Sat, 12 Jul 2014)
> Log Message:
> -----------
> * NEW: First attempt to define a Graph class interface

@Benoit: I haven't read the Paint/Image classes yet you proposed. I thought
maybe I should just commit to let you see what I did.

The virtual classes approach works by:
 (1) Define a virtual class property to mean something, like Graph.Vertices,
     virtual of type .Graph.Vertices to enumerate vertices.
 (2) In .Graph.Vertices, define _next() to call a hidden method
     _nextVertex() which is implemented in the real Graph class.

This minimises the amount of classes one has to write because everything can
get into Graph or the _Graph_Vertex class (we have a total of 5 enumerable
classes merged this way into these both classes).

I attach a project which implements a Graph over an Image object which can
be flood-filled by the BFS algorithm. The interesting source files would be
in ImageGraph/.

In the GUI, you have a minimal ColorChooser type of control on the right
side. Just select a color and then click on the Image to start the flood-
fill at the pixel you pointed to.


"There's an old saying: Don't change anything... ever!" -- Mr. Monk
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