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Old 01-15-2011, 10:24 PM   #1
darthaxul
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Registered: Aug 2008
Distribution: Gentoo; Funtoo
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cairo image refresh draw


Trying to redraw different image via changeimage button event. Any ideas how to make that happen?

cairo_surface_t *image;
static gboolean pimage(GtkWidget *widget,GdkEventExpose *event,gpointer data)
{
cairo_t *cr;
cr = gdk_cairo_create (widget->window);
if(count==3)
image = cairo_image_surface_create_from_png("first.png");
else
image = cairo_image_surface_create_from_png("second.png");

cairo_set_source_surface(cr, image, 620, 81);
cairo_paint(cr);
cairo_destroy(cr);
return FALSE;
}
void changeimage(GtkWidget *widget)
{

}
g_signal_connect(window, "expose-event", G_CALLBACK (pimage), NULL);
 
Old 01-18-2011, 12:07 AM   #2
TheIndependentAquarius
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See if this thread helps you: http://www.linuxquestions.org/questi...ibrary-792804/

If not then consider shooting off a mail to: http://lists.cairographics.org/mailman/listinfo/cairo
 
Old 01-25-2011, 02:52 PM   #3
Julian Andrews
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Registered: Jan 2011
Distribution: Ubuntu
Posts: 21

Rep: Reputation: 13
I'm not 100% sure what the part of the process your having trouble with is, but my best guess is that you want to cause the widget to redraw when changeimage() is called.

Here's my best guess at what you're looking for:
Code:
void changeimage(GtkWidget *widget)
{
    count = (count + 1) % 4;
    if (count == 3)
    {
        gtk_widget_queue_draw(widget);
    }
}
I'm just guessing based on the 'if (count)==3' in your code that what you want is for the image to change to "first.png" every 4th click. Anyway, let me know if I'm on target!

P.S: please excuse any syntax errors, I work mostly in python, and my C is very rusty.
 
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Old 01-30-2011, 01:13 AM   #4
darthaxul
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Thumbs up

yes! elemetary my dear watson, always overlooking the simple...
 
  


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