func (t *PDFStreamTextObject) WriteAt(text string, props TypesettingProps, x float64, y float64) error {
var layout *C.PangoLayout
var font_description *C.PangoFontDescription
font_description = C.pango_font_description_new()
cfontname := C.CString(props.Fontname)
defer C.free(unsafe.Pointer(cfontname))
C.pango_font_description_set_family(font_description, cfontname)
C.pango_font_description_set_weight(font_description, C.PANGO_WEIGHT_NORMAL)
C.pango_font_description_set_absolute_size(font_description, C.double(props.Fontsize)*C.PANGO_SCALE)
layout = C.pango_cairo_create_layout(t.context)
C.pango_layout_set_font_description(layout, font_description)
width := props.PageWidth - props.LeftMargin - props.RightMargin
fmt.Printf("width is %f\n", width)
C.pango_layout_set_width(layout, C.int(width*C.PANGO_SCALE))
C.pango_layout_set_justify(layout, C.TRUE)
ctext := C.CString(text)
defer C.free(unsafe.Pointer(ctext))
C.pango_layout_set_text(layout, ctext, -1)
C.cairo_set_source_rgb(t.context, 0.0, 0.0, 0.0)
C.cairo_move_to(t.context, C.double(x), C.double(y))
skip := props.Baselineskip
nlines := int(C.pango_layout_get_line_count(layout))
for i := 0; i < nlines; i++ {
C.cairo_move_to(t.context, C.double(x), C.double(y+float64(i)*skip))
C.pango_cairo_show_layout_line(t.context, C.pango_layout_get_line(layout, C.int(i)))
}
C.g_object_unref(C.gpointer(layout))
C.pango_font_description_free(font_description)
return nil
}
func ShowLayoutLine(cr0 *cairo.Context, line0 *pango.LayoutLine) {
var cr1 *C.cairoContext
var line1 *C.PangoLayoutLine
if cr0 != nil {
cr1 = (*C.cairoContext)(cr0.C)
}
line1 = (*C.PangoLayoutLine)(unsafe.Pointer(line0))
C.pango_cairo_show_layout_line(cr1, line1)
}
//void pango_cairo_show_layout_line (cairo_t *cr,
// PangoLayoutLine *line);
func CairoShowLayoutLine(cr *cairo.Context, line *LayoutLine) {
C.pango_cairo_show_layout_line(cairo_context(cr), line.native())
}