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Old 24th June 2003, 08:58 AM   #4
Andy
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Join Date: Jun 2003
Posts: 4,450
Default Re: What are people developing with the SDK?

This sort of thing is easy enough in 3.6 but to make it undoable is a bit of a nightmare (or is quite inefficient).

For the next release (3.7), things are a lot better.

Here's the actual code that changes the surface shading (when 'Flat' or 'Smooth' is pressed).

Code:
class UndoableSurfacesSetShading : public Undoable
{
private:

	List *surfaces;
	List *oldshading;
	int newshading;

public:

	UndoableSurfacesSetShading(int col)
	{
	newshading = col;
	surfaces = ac_selection_get_whole_surfaces_all();
	oldshading = NULL;
	}

	void execute()
	{
	List *last = NULL;
	int numdone = 0;

	display_message("setting shading on surfaces...");

	// save the old colours in a list
	for (List *p = surfaces; p != NULL; p = p->next)
		{
		Surface *s = (Surface *)p->data;

		last = list_add_item_fast(&oldshading, last, (void *)surface_get_shading(s));

		surface_set_shading(s, newshading);
		numdone++;
		}

	redraw_all();
	display_message("new shading set on surfaces: %d", numdone);
	}

	
	void undo()
	{
	// restore the original types
	display_message("restoring surface shading");

	List *cl = oldshading;
	int numdone = 0;
	for (List *p = surfaces; p != NULL; p = p->next, cl = cl->next)
		{
		Surface *s = (Surface *)p->data;
		int oldshadingt = (int)cl->data;

		surface_set_shading(s, oldshadingt);
		numdone++;
		}

	redraw_all();

	display_message("shading set on surfaces: %d", numdone);
	}

	void redo()
	{
	for (List *p = surfaces; p != NULL; p = p->next)
		{
		Surface *s = (Surface *)p->data;

		surface_set_shading(s, newshading);
		}
	redraw_all();
	}

	~UndoableSurfacesSetShading()
	{
		list_free(&surfaces);
		list_free(&oldshading);
	}
};






Prototype void selected_set_surface_shading(int indexc)
{

	add_undoable("set surface shading", new UndoableSurfacesSetShading(indexc));
}
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