hello, I want to draw a simple point on a drawing area and can't get it done. I'm using a tutorial and i'm following everything it says but as soon as I want to do my own gtk_draw_point function nothing is drawn and i get an error at runtime saying that assertion drawable != NULL failed.
I have the following code to create a blank drawing area at startup: int configure_event (GtkWidget *widget, GdkEventConfigure *event) { if (pixmap) gdk_pixmap_unref(pixmap); pixmap = gdk_pixmap_new(widget->window, widget->allocation.width, widget->allocation.height, -1); gdk_draw_rectangle (pixmap,widget->style->white_gc,TRUE, 0, 0, widget->allocation.width, widget->allocation.height); return TRUE; } Then I have this code to redraw the area if exposed: int expose_event (GtkWidget *widget, GdkEventExpose *event) { gdk_draw_pixmap(widget->window, widget->style->fg_gc[GTK_WIDGET_STATE (widget)], pixmap, event->area.x, event->area.y, event->area.x, event->area.y, event->area.width, event->area.height); return FALSE; } There is code in the tutorial to implement a brush to be drawn when a mouse click is detected but I don't want to do it that way. I want to draw a point on a line after other parts of my code do some calculations. I have the following as the rest of my code (the drawing area relevant sections): GdkPixmap *pixmap = NULL; GtkWidget *drawable; drawable = gtk_drawing_area_new(); gtk_drawing_area_size(GTK_DRAWING_AREA(drawable),400,300); and I use the following to draw a point: gdk_draw_point(pixmap,mainwindow->style->black_gc,10,10); If I put that draw_point function within the configure_event function I get the point draw but of course that only happens when the window is first created. My question is what am i missing? If the assertion that drawable != NULL works within the function then why not outside the configure_event function? Also, once I get the draw_point function working will I need to repaint the drawing area everytime a new point is drawn in order to see it or will it appear automatically? If not, what I just create a timeout somehow to automatically repaint after x amount of seconds since no other signals will be generated? (my other code just does math functions and I will be plotting points as it does so) thanks for any help, if i need to post more code please tell me. brandon _______________________________________________ gtk-list mailing list [EMAIL PROTECTED] http://mail.gnome.org/mailman/listinfo/gtk-list