GTK+ Forums

#include <stdio.h>
#include <pango/pangocairo.h>
void rendertext(cairo_t *cr);
int main(int argc, char* argv[])
{
    cairo_t *cr;
    cairo_status_t status;
    cairo_surface_t *surface;
    surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 300, 100);
    cairo_image_surface_create(pixelformat, width, height);
    cr = cairo_create(surface);
    // tell the cairo instance 'cr' to output to 'surface'
    cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
    // sets the drawing colour to white
    cairo_paint(cr);
    // fill the surface with the active colour (if you don't do this, you will
    // be given a surface with a transparent background to draw on)
    rendertext(cr);
    // do pango stuff here
    cairo_destroy(cr);
    // free the cairo instance
    status = cairo_surface_write_to_png(surface, "out.png");
    // output the contents of 'surface' to the file "out.png"
    cairo_surface_destroy(surface);
    // free the surface
    if (status != CAIRO_STATUS_SUCCESS)
    {
      // if 'status' was not set to indicate a successful operation when saving as a png, error
      printf("Could not save to png, \"out.png\"\n");
      return 1;
    }
    return 0;
}

void rendertext(cairo_t *cr)
{
    PangoLayout *layout;
    // layout for a paragraph of text
    PangoFontDescription *desc;
    // this structure stores a description of the style of font you'd most like
    cairo_translate(cr, 10, 20);
    // set the origin of cairo instance 'cr' to (10,20) (i.e. this is where
    // drawing will start from).
    layout = pango_cairo_create_layout(cr);
    // init pango layout ready for use
    pango_layout_set_text(layout, "Hello World!", -1);
    // sets the text to be associated with the layout (final arg is length, -1
    // to calculate automatically when passing a nul-terminated string)
    desc = pango_font_description_from_string("Sans Bold 12");
    // specify the font that would be ideal for your particular use
    pango_layout_set_font_description(layout, desc);
    // assign the previous font description to the layout
    pango_font_description_free(desc);
    // free the description
    cairo_set_source_rgb(cr, 0.0, 0.0, 1.0);
    // set the colour to blue 
    pango_cairo_update_layout(cr, layout);
    // if the target surface or transformation properties of the cairo instance
    // have changed, update the pango layout to reflect this
    pango_cairo_show_layout(cr, layout);
    // draw the pango layout onto the cairo surface
    g_object_unref(layout);
    // free the layout
}