/* subfunction of gtk_plot_cairo_draw_string(). */
static gint
drawstring(GtkPlotPC *pc,
gint angle,
gint dx, gint dy,
GtkPSFont *psfont, gint height,
const gchar *text)
{
cairo_t *cairo = GTK_PLOT_CAIRO(pc)->cairo;
PangoLayout *layout = GTK_PLOT_CAIRO(pc)->layout;
PangoFontDescription *font;
PangoRectangle rect;
PangoFontMap *map;
gint ret_value;
gint dpi_cairo, dpi_screen;
GdkScreen *screen = gdk_screen_get_default();
if(!text || strlen(text) == 0) return 0;
cairo_save(cairo);
map = pango_cairo_font_map_get_default();
dpi_cairo = pango_cairo_font_map_get_resolution(PANGO_CAIRO_FONT_MAP(map));
dpi_screen = gdk_screen_get_resolution(screen);
height *= (double)dpi_screen/(double)dpi_cairo;
font = gtk_psfont_get_font_description(psfont, height);
pango_layout_set_font_description(GTK_PLOT_CAIRO(pc)->layout, font);
pango_layout_set_text(GTK_PLOT_CAIRO(pc)->layout, text, strlen(text));
pango_layout_get_extents(GTK_PLOT_CAIRO(pc)->layout, NULL, &rect);
if (psfont->i18n_latinfamily && psfont->vertical) {
/* vertical-writing CJK postscript fonts. */
return rect.height;
}
else
{
/* horizontal writing */
if(angle == 90)
// cairo_translate(cairo, dx, dy-PANGO_PIXELS(rect.width));
cairo_translate(cairo, dx, dy);
else if(angle == 270)
cairo_translate(cairo, dx+PANGO_PIXELS(rect.height), dy);
else if(angle == 180)
cairo_translate(cairo, dx-PANGO_PIXELS(rect.width), dy);
else
cairo_translate(cairo, dx, dy);
}
cairo_rotate(cairo, -angle * G_PI / 180);
pango_cairo_update_layout(cairo, layout);
pango_cairo_show_layout(cairo, layout);
cairo_restore(cairo);
pango_font_description_free(font);
ret_value = (angle == 0 || angle == 180) ? rect.width : rect.height;
return PANGO_PIXELS(rect.width);
}
static VALUE
rg_resolution(VALUE self)
{
return rb_float_new(pango_cairo_font_map_get_resolution(_SELF(self)));
}
