On Mon, 14 Oct 2013 19:34:53 +0200
Satz Klauer <satzkla...@googlemail.com> wrote:
> Hi,
>
> I try to print some vector data using GTK/Cairo. Unfortunately my
> printer only produces empty pages, means there is no print operation,
> the paper sheets are just moved.
>
> That's how I'm initialising everything:
>
> GtkPrintOperation *op;
>
> op = gtk_print_operation_new();
> gtk_print_operation_set_allow_async(op,TRUE);
> gtk_print_operation_set_n_pages(op, 1);
> gtk_print_operation_set_unit (op,GTK_UNIT_POINTS);
> g_signal_connect (op, "draw_page", G_CALLBACK(draw_page), NULL);
> gtk_print_operation_run (op, GTK_PRINT_OPERATION_ACTION_PRINT,NULL,
> NULL);
>
> The print-callback (which is called successfuly) looks like this:
>
> static void draw_page (GtkPrintOperation *operation,GtkPrintContext
> *context,int page_nr)
> {
> GtkPrintSettings *settings;
>
> cairo_t *cr = gtk_print_context_get_cairo_context (context);
> settings = gtk_print_operation_get_print_settings (operation);
> cairo_set_source_rgb(dc,0,0,0);
> cairo_set_line_width(dc,m_data->config.m_linewidth);
>
> cairo_move_to (cr,x0,y0);
> cairo_line_to (cr,x1,y1);
> cairo_line_to (cr,x2,y2);
> ...
> // some more lines...
> }
>
> What could be missing here? Do I have to close/finish the drawing
> operation somehow?
That depends on what you are trying to draw. I suspect you are looking
for cairo_stroke(), but you could also consider cairo_fill(). Note also
the *_preserve() variants.
Chris
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