func (c *Canvas) FillString(font vg.Font, x, y vg.Length, str string) {
c.gc.Save()
defer c.gc.Restore()
data, ok := fontMap[font.Name()]
if !ok {
panic(fmt.Sprintf("Font name %s is unknown", font.Name()))
}
if !registeredFont[font.Name()] {
draw2d.RegisterFont(data, font.Font())
registeredFont[font.Name()] = true
}
c.gc.SetFontData(data)
c.gc.SetFontSize(font.Size.Points())
c.gc.Translate(x.Dots(c.DPI()), y.Dots(c.DPI()))
c.gc.Scale(1, -1)
c.gc.FillString(str)
}
