Re: Copy parts of one image to another

[Tim Evans <t evans aranz com>]

Tim Evans wrote:

> Trevor Fancher wrote:
>
> > This is driving me absolutely nuts.  I have been trying for the past 3
> > days.  I have searched on Google and everywhere else logical.  My
> > question is, "How do I copy part of one image to part of another?"
> >
> > What I want to do is copy a 16x16 area from my tileset image to a
> > background image and then display the results in a GtkEventbox.  I am
> > so frustrated because I just cannot figure this out.  If someone could
> > give me some example code doing this task, I would be *very*
> > appreciative.
>
>
> Load your tileset image using:
>   GdkPixbuf *tileset;
>   GError *error=NULL;
>   tileset = gdk_pixbuf_new_from_file ("tileset.png", &error);
>
> Create an empty 16x16 tile pixbuf using:
>   GdkPixbuf *tile;
>   tile = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, 16, 16);

Oops, I left out a step here:

  Copy tile <i,j> into the tile pixbuf:
    gint i, j;
    gdk_pixbuf_copy_area (tileset, i*16, j*16, 16, 16, tile, 0, 0);

> Then display each tile in a GtkImage widget:
>   GtkWidget *image;
>   image = gtk_image_new ();
>   gtk_image_set_from_pixbuf (GTK_IMAGE (image), tile);
>
> And place the image inside the eventbox:
>   gtk_container_add (GTK_CONTAINER (eventbox), image);


--
Tim Evans
Applied Research Associates NZ
http://www.aranz.com/