dflplot/Plot2Kill, Most Mature *nix GUI For D2

[Johannes Pfau]

On 17.07.2010 07:57, "Jérôme M. Berger" wrote:
> dsimcha wrote:
>> == Quote from dsimcha (dsimcha at yahoo.com)'s article
>>> 1.  Doesn't Window mean that the plot would have to exist in its own window?  I'd
>>> like to be able to make a plot go to one section of a larger window.
>>> 2.  When I do:
>>> drawable = (new DrawingArea(800, 600)).getWindow();
>>> drawable somehow ends up null.
>>
>> Never mind, I figured this stuff out, though the documentation is rather obtuse
>> and in serious need of examples of how to accomplish simple things.  However, I
>> can't get the DrawingArea to actually show up on the screen.  I just get a blank
>> window.  Here's a reduced test case.  Can someone tell me what's wrong w/ it
>> and/or provide minimal example code to get stuff drawn via DrawingArea to show up
>> on screen?
>>
>> import gtk.DrawingArea, gtk.Main, gtk.MainWindow, gdk.GC, gdk.Drawable,
>>     gdk.Color;
>>
>> void main(string[] args) {
>>     Main.init(args);
>>
>>     auto win = new MainWindow("Hello, world");
>>     win.setDefaultSize(800, 600);
>>     auto drawingArea = new DrawingArea(800, 600);
>>     win.add(drawingArea);
>>     drawingArea.realize();
>>
>>     auto drawable = drawingArea.getWindow();
>>     auto gc = new GC(drawable);
>>     gc.setForeground(new Color(255, 0, 0));
>>     gc.setBackground(new Color(255, 255, 255));
>>     drawable.drawLine(gc, 0, 0, 100, 100);
>>
>>     drawingArea.showAll();
>>     drawingArea.queueDraw();
>>     win.showAll();
>>
>>     Main.run();
>> }
> 	The problem is that gtk.DrawingArea is stateless. This means that
> it won't remember what you draw on it. There are two solutions to this:
> - Use a Canvas widget. There isn't one in gtk, but there are some
> options out there. I don't know if any of them have a D wrapper;
> - Define a callback for the "expose_event" signal on your
> drawingArea and put your drawing code in there.
> 
> 	Try the following (untested) code:
> ========================================8<----------------------------------------
> import gtk.DrawingArea, gtk.Main, gtk.MainWindow, gdk.GC,
>     gdk.Drawable, gdk.Color;
> 
> bool onExposeEvent (GdkEventExpose*, Widget drawingArea) {
>     auto drawable = drawingArea.getWindow();
>     auto gc = new GC(drawable);
>     gc.setForeground(new Color(255, 0, 0));
>     gc.setBackground(new Color(255, 255, 255));
>     drawable.drawLine(gc, 0, 0, 100, 100);
> }
> 
> void main(string[] args) {
>     Main.init(args);
> 
>     auto win = new MainWindow("Hello, world");
>     win.setDefaultSize(800, 600);
>     auto drawingArea = new DrawingArea(800, 600);
>     win.add(drawingArea);
>     drawingArea.realize();
> 
>     drawingArea.addOnExpose ((GdkEventExpose* event,
>                               Widget drawingArea) {
>         auto drawable = drawingArea.getWindow();
>         auto gc = new GC(drawable);
>         gc.setForeground(new Color(255, 0, 0));
>         gc.setBackground(new Color(255, 255, 255));
>         drawable.drawLine(gc, 0, 0, 100, 100);
> 	return true;
>     });
> 
>     drawingArea.showAll();
>     drawingArea.queueDraw();
>     win.showAll();
> 
>     Main.run();
> }
> ---------------------------------------->8========================================
> 
> 		Jerome
It's missing the gtk.Widget import and onExposeEvent is missing a
return. ("TRUE to stop other handlers from being invoked for the event.
FALSE to propagate the event further.")
But with these small fixes, it's working.

@dsimcha there's an example in the gtkd source:
demos/cairo/cairo_clock

The gtkd Makefile doesn't compile it for some reason, but it is working
with D2.
-- 
Johannes Pfau