// Set up the drawingwand "dw" for the given font name, font size, and colour.
// If the font or size changes sx get the new width of a space
// (the magickwand is required if it is necessary to query the font metrics)
func draw_setfont(mw *imagick.MagickWand, dw *imagick.DrawingWand, font string, size float64, colour string, sx *float64) {
sflag := false
if len(font) > 0 {
dw.SetFont(font)
sflag = true
}
if len(colour) > 0 {
pw := imagick.NewPixelWand()
pw.SetColor(colour)
dw.SetFillColor(pw)
pw.Destroy()
sflag = true
}
if size > 0 {
dw.SetFontSize(size)
}
// If either the font or the fontsize (or both) have changed
// we need to get the size of a space again
if sflag {
fm := mw.QueryFontMetrics(dw, " ")
*sx = fm.TextWidth
}
}
