Clear A Pixmap
Hi Everyone! I explain my thing... I have a pixmap, a drawing area. There are events that draw on it. But i have a button that must clear, erase all the painted on the drawing area. Any idea how to make it happen Thanxs 4 advancement peoople! ;-) -- View this message in context: http://www.nabble.com/Clear-A-Pixmap-tf3849301.html#a10903439 Sent from the Gtk+ - Apps Dev mailing list archive at Nabble.com. ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Clear A Pixmap
On Thu, May 31, 2007 at 03:35:07PM -0700, nahuel9728 wrote: > I explain my thing... I have a pixmap, a drawing area. > There are events that draw on it. But i have a button that must clear, erase > all the painted on the drawing area. > Any idea how to make it happen Make the drawing area repaint (e.g. with gtk_widget_queue_draw()) and just do not draw anything there in the "expose-event" handler this time. Yeti -- http://gwyddion.net/ ___ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
Re: Clear A Pixmap
Thaxs Yeti for the answer but Sorry I'm not able to do it. I explain a little
bit what im doing and i would like to do:
main(){
mem_map=gtk_drawing_area_new();
gtk_signal_connect (GTK_OBJECT (mem_map), "expose_event",(GtkSignalFunc)
expose_event, NULL);
gtk_signal_connect
(GTK_OBJECT(mem_map),"configure_event",(GtkSignalFunc)configure_event,
NULL);
gtk_signal_connect (GTK_OBJECT (mem_map),
"button_press_event",(GtkSignalFunc) button_press_event, NULL);
/*A button to erase all the drawed and paint things*/
boton = gtk_button_new_with_label ("Clear and paint");
gtk_signal_connect_object (GTK_OBJECT (boton), "clicked",GTK_SIGNAL_FUNC
(clear_and_paint),GTK_OBJECT (main_window));
show
}
void expose_event(){
gdk_draw_pixmap
}
void clear_and_pain(GtkWidget *widget, GdkEventExpose *event){
/*HERE I WANNA CLEAN ALL MY DRAWED AREA*/
gtk_widget_queue_draw_area(GTK_WIDGET(mem_map),0,0,910,440);
/*This up should clean all the area??? */
/*And later draw things.*/
draw_brush();
}
Any idea anyone??? Has done somthing similar
David Nečas (Yeti)-2 wrote:
>
> On Thu, May 31, 2007 at 03:35:07PM -0700, nahuel9728 wrote:
>> I explain my thing... I have a pixmap, a drawing area.
>> There are events that draw on it. But i have a button that must clear,
>> erase
>> all the painted on the drawing area.
>> Any idea how to make it happen
>
> Make the drawing area repaint (e.g. with gtk_widget_queue_draw())
> and just do not draw anything there in the "expose-event"
> handler this time.
>
> Yeti
>
> --
> http://gwyddion.net/
> ___
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>
>
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Re: Clear A Pixmap
On Fri, Jun 01, 2007 at 05:38:54PM -0700, nahuel9728 wrote:
>
> Thaxs Yeti for the answer but Sorry I'm not able to do it. I explain a little
> bit what im doing and i would like to do:
> main(){
> mem_map=gtk_drawing_area_new();
> gtk_signal_connect (GTK_OBJECT (mem_map), "expose_event",(GtkSignalFunc)
> expose_event, NULL);
> gtk_signal_connect
> (GTK_OBJECT(mem_map),"configure_event",(GtkSignalFunc)configure_event,
> NULL);
> gtk_signal_connect (GTK_OBJECT (mem_map),
> "button_press_event",(GtkSignalFunc) button_press_event, NULL);
> /*A button to erase all the drawed and paint things*/
> boton = gtk_button_new_with_label ("Clear and paint");
> gtk_signal_connect_object (GTK_OBJECT (boton), "clicked",GTK_SIGNAL_FUNC
> (clear_and_paint),GTK_OBJECT (main_window));
> show
> }
>
> void expose_event(){
> gdk_draw_pixmap
> }
>
> void clear_and_pain(GtkWidget *widget, GdkEventExpose *event){
> /*HERE I WANNA CLEAN ALL MY DRAWED AREA*/
>gtk_widget_queue_draw_area(GTK_WIDGET(mem_map),0,0,910,440);
> /*This up should clean all the area??? */
>
> /*And later draw things.*/
> draw_brush();
> }
> Any idea anyone??? Has done somthing similar
Sorry, this is a mess, I have no idea what you are doing.
However, you seem to started from the Gtk+ scribble example,
so here's a patch to scribble-simple.c that adds a Clear
button:
===
--- scribble-simple.c.orig 2007-05-02 18:27:36.0 +0200
+++ scribble-simple.c 2007-06-02 12:25:02.0 +0200
@@ -115,12 +115,21 @@
exit (0);
}
+static void
+clear(GtkWidget *widget)
+{
+gdk_draw_rectangle(pixmap, widget->style->white_gc, TRUE,
+ 0, 0,
+ widget->allocation.width, widget->allocation.height);
+gtk_widget_queue_draw(widget);
+}
+
int main( int argc,
char *argv[] )
{
GtkWidget *window;
GtkWidget *drawing_area;
- GtkWidget *vbox;
+ GtkWidget *vbox, *hbox;
GtkWidget *button;
@@ -164,16 +173,19 @@
| GDK_POINTER_MOTION_MASK
| GDK_POINTER_MOTION_HINT_MASK);
- /* .. And a quit button */
- button = gtk_button_new_with_label ("Quit");
- gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
-
- g_signal_connect_swapped (G_OBJECT (button), "clicked",
- G_CALLBACK (gtk_widget_destroy),
- G_OBJECT (window));
- gtk_widget_show (button);
+ hbox = gtk_hbox_new(TRUE, 0);
+ gtk_box_pack_start(GTK_BOX(vbox), hbox, FALSE, FALSE, 0);
+
+ button = gtk_button_new_with_label("Clear");
+ gtk_box_pack_start(GTK_BOX(hbox), button, TRUE, TRUE, 0);
+ g_signal_connect_swapped(button, "clicked", G_CALLBACK(clear), drawing_area);
+
+ button = gtk_button_new_with_label("Quit");
+ gtk_box_pack_start(GTK_BOX(hbox), button, TRUE, TRUE, 0);
+ g_signal_connect_swapped(button, "clicked",
+ G_CALLBACK(gtk_widget_destroy), window);
- gtk_widget_show (window);
+ gtk_widget_show_all(window);
gtk_main ();
===
Yeti
--
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Re: Clear A Pixmap
Yeti.. THANK U VERY MUCH!!
Sorry for use the forum for this but...
THANK YOU for YOUR HELP! You're the best
David Nečas (Yeti)-2 wrote:
>
> On Fri, Jun 01, 2007 at 05:38:54PM -0700, nahuel9728 wrote:
>>
>> Thaxs Yeti for the answer but Sorry I'm not able to do it. I explain a
>> little
>> bit what im doing and i would like to do:
>> main(){
>> mem_map=gtk_drawing_area_new();
>> gtk_signal_connect (GTK_OBJECT (mem_map), "expose_event",(GtkSignalFunc)
>> expose_event, NULL);
>> gtk_signal_connect
>> (GTK_OBJECT(mem_map),"configure_event",(GtkSignalFunc)configure_event,
>> NULL);
>> gtk_signal_connect (GTK_OBJECT (mem_map),
>> "button_press_event",(GtkSignalFunc) button_press_event, NULL);
>> /*A button to erase all the drawed and paint things*/
>> boton = gtk_button_new_with_label ("Clear and paint");
>> gtk_signal_connect_object (GTK_OBJECT (boton), "clicked",GTK_SIGNAL_FUNC
>> (clear_and_paint),GTK_OBJECT (main_window));
>> show
>> }
>>
>> void expose_event(){
>> gdk_draw_pixmap
>> }
>>
>> void clear_and_pain(GtkWidget *widget, GdkEventExpose *event){
>> /*HERE I WANNA CLEAN ALL MY DRAWED AREA*/
>>gtk_widget_queue_draw_area(GTK_WIDGET(mem_map),0,0,910,440);
>> /*This up should clean all the area??? */
>>
>> /*And later draw things.*/
>> draw_brush();
>> }
>> Any idea anyone??? Has done somthing similar
>
> Sorry, this is a mess, I have no idea what you are doing.
>
> However, you seem to started from the Gtk+ scribble example,
> so here's a patch to scribble-simple.c that adds a Clear
> button:
>
> ===
> --- scribble-simple.c.orig2007-05-02 18:27:36.0 +0200
> +++ scribble-simple.c 2007-06-02 12:25:02.0 +0200
> @@ -115,12 +115,21 @@
>exit (0);
> }
>
> +static void
> +clear(GtkWidget *widget)
> +{
> +gdk_draw_rectangle(pixmap, widget->style->white_gc, TRUE,
> + 0, 0,
> + widget->allocation.width,
> widget->allocation.height);
> +gtk_widget_queue_draw(widget);
> +}
> +
> int main( int argc,
>char *argv[] )
> {
>GtkWidget *window;
>GtkWidget *drawing_area;
> - GtkWidget *vbox;
> + GtkWidget *vbox, *hbox;
>
>GtkWidget *button;
>
> @@ -164,16 +173,19 @@
>| GDK_POINTER_MOTION_MASK
>| GDK_POINTER_MOTION_HINT_MASK);
>
> - /* .. And a quit button */
> - button = gtk_button_new_with_label ("Quit");
> - gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
> -
> - g_signal_connect_swapped (G_OBJECT (button), "clicked",
> - G_CALLBACK (gtk_widget_destroy),
> - G_OBJECT (window));
> - gtk_widget_show (button);
> + hbox = gtk_hbox_new(TRUE, 0);
> + gtk_box_pack_start(GTK_BOX(vbox), hbox, FALSE, FALSE, 0);
> +
> + button = gtk_button_new_with_label("Clear");
> + gtk_box_pack_start(GTK_BOX(hbox), button, TRUE, TRUE, 0);
> + g_signal_connect_swapped(button, "clicked", G_CALLBACK(clear),
> drawing_area);
> +
> + button = gtk_button_new_with_label("Quit");
> + gtk_box_pack_start(GTK_BOX(hbox), button, TRUE, TRUE, 0);
> + g_signal_connect_swapped(button, "clicked",
> + G_CALLBACK(gtk_widget_destroy), window);
>
> - gtk_widget_show (window);
> + gtk_widget_show_all(window);
>
>gtk_main ();
>
> ===
>
> Yeti
>
> --
> http://gwyddion.net/
> ___
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> gtk-app-devel-list@gnome.org
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>
>
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