PangoLayout wrap + drawing

[z2274394 student unsw edu au]

Dear All,
I have a pangoLayout which is 'wrap' enabled, align = center. and when i call
gdk_draw_layout, it paints the layout but not according to the x position
specified by gdk_draw_layout. this can be understandable when the pangolayout is
multiline and hence aligned centerly, but this happens for one line also (wrap =
enabled, but smaller than wrapping width), and i fail to see why there is a
difference in x position between painting an unwrap-layout and painting a
wrap-singleLine-layout.

this is illustrated in the test program below:
attempts to draws 3 times, 
1st time at (0,0) - wrap, (fail)
2nd time at middle  (fail)
3rd time = unwrapped line.

The question is. What am i missing in the code or doing things wrong
so that i can correctly pinpoint the x value interested in drawing. (ie just
like how it is done in a unwrapped-pangolayout)

Thanks alot for any comments in advance
Gangas




********* ATTACH TEST PROGRAM *******

#include <gtk/gtk.h>

gboolean exposeCB(GtkWidget *wid, GdkEventExpose *event, gpointer data)
{
  PangoLayout *layout; 
  gint plotWidth = wid->allocation.width;
  gint w; gint h;

 layout = gtk_widget_create_pango_layout(wid, "ashdaiosuh diausdh iasudhias uh
uias hda hsd asdluiahsd sd sd sdasdsadas ");
 pango_layout_set_font_description(layout,
pango_font_description_from_string("sans 10"));
 pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER);
 pango_layout_set_width(layout, 1000 * plotWidth);
 pango_layout_set_wrap(layout, PANGO_WRAP_WORD);
 pango_layout_get_pixel_size(layout, &w, &h);
 // 1st drawing at (0,0) - wrap
 gdk_draw_layout(wid->window, gdk_gc_new(wid->window), 0, 0, layout);
 // 2nd drawing - attempt to position dead middle - wrap
 gdk_draw_layout(wid->window, gdk_gc_new(wid->window), plotWidth / 2 - w/2, 50,
layout);
 gdk_draw_line(wid->window, gdk_gc_new(wid->window), 
               plotWidth / 2, 75, plotWidth, 75);
 // 3rd drawing at (0,0) - not wrap
 pango_layout_set_width(layout, -1);
 gdk_draw_layout(wid->window, gdk_gc_new(wid->window), 0, 100, layout);

 return FALSE;
}
                            

int main(int argc, char **argv) {
  GtkWidget *plotWindow;
  GtkWidget *drawingArea;

  gtk_init(&argc, &argv);
  plotWindow = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  drawingArea = gtk_drawing_area_new();
  gtk_widget_set_size_request(drawingArea, 700, 400);
  g_signal_connect(G_OBJECT(drawingArea), "expose_event",
                   G_CALLBACK(exposeCB), NULL);
  gtk_container_add(GTK_CONTAINER(plotWindow), drawingArea);
  gtk_widget_show_all(plotWindow);
  gtk_main();

  return 0;
}

********** END TEST PROGRAM **********