A `GtkPrintContext` encapsulates context information that is required when drawing pages for printing.
This includes the cairo context and important parameters like page size and resolution. It also lets you easily create [
[email protected]] and [[email protected]] objects that match the font metrics of the cairo surface.
`GtkPrintContext` objects get passed to the [[email protected]:GtkPrintContext:begin-print], [
[email protected]:GtkPrintContext:end-print], [[email protected]:GtkPrintContext:request-page-setup
] and [[email protected]:GtkPrintContext:draw-page] signals on the [[email protected]] object.
Using GtkPrintContext in a GtkPrintContext::draw-page callback
```c static void draw_page (GtkPrintOperation *operation, GtkPrintContext *context, int page_nr) { cairo_t *cr; PangoLayout *layout;
PangoFontDescription *desc;
cr = gtk_print_context_get_cairo_context (context);
// Draw a red rectangle, as wide as the paper (inside the margins) cairo_set_source_rgb (cr, 1.0, 0, 0); cairo_rectangle (cr, 0, 0,
gtk_print_context_get_width (context), 50);
cairo_fill (cr);
// Draw some lines cairo_move_to (cr, 20, 10); cairo_line_to (cr, 40, 20); cairo_arc (cr, 60, 60, 20, 0, M_PI); cairo_line_to (cr,
80, 20);
cairo_set_source_rgb (cr, 0, 0, 0); cairo_set_line_width (cr, 5); cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND); cairo_set_line_join (
cr, CAIRO_LINE_JOIN_ROUND);
cairo_stroke (cr);
// Draw some text layout = gtk_print_context_create_pango_layout (context); pango_layout_set_text (layout, "Hello World! Printing is
easy", -1); desc = pango_font_description_from_string ("sans 28"); pango_layout_set_font_description (layout, desc);
pango_font_description_free (desc);
cairo_move_to (cr, 30, 20); pango_cairo_layout_path (cr, layout);
// Font Outline cairo_set_source_rgb (cr, 0.93, 1.0, 0.47); cairo_set_line_width (cr, 0.5); cairo_stroke_preserve (cr);
// Font Fill cairo_set_source_rgb (cr, 0, 0.0, 1.0); cairo_fill (cr);
g_object_unref (layout); } ```