func main() { flag.Parse() fmt.Printf("Loading fontfile %q\n", *fontfile) b, err := ioutil.ReadFile(*fontfile) if err != nil { log.Println(err) return } font, err := truetype.Parse(b) if err != nil { log.Println(err) return } fupe := font.FUnitsPerEm() printBounds(font.Bounds(fupe)) fmt.Printf("FUnitsPerEm:%d\n\n", fupe) c0, c1 := 'A', 'V' i0 := font.Index(c0) hm := font.HMetric(fupe, i0) g := truetype.NewGlyphBuf() err = g.Load(font, fupe, i0, truetype.NoHinting) if err != nil { log.Println(err) return } fmt.Printf("'%c' glyph\n", c0) fmt.Printf("AdvanceWidth:%d LeftSideBearing:%d\n", hm.AdvanceWidth, hm.LeftSideBearing) printGlyph(g) i1 := font.Index(c1) fmt.Printf("\n'%c', '%c' Kerning:%d\n", c0, c1, font.Kerning(fupe, i0, i1)) }
// NewContext creates a new Context. func NewContext() *Context { return &Context{ r: raster.NewRasterizer(0, 0), glyphBuf: truetype.NewGlyphBuf(), fontSize: 12, dpi: 108, scale: 12 << 6, } }
// NewGraphicContextWithPainter creates a new Graphic context from an image and a Painter (see Freetype-go) func NewGraphicContextWithPainter(img draw.Image, painter Painter) *GraphicContext { width, height := img.Bounds().Dx(), img.Bounds().Dy() dpi := 92 gc := &GraphicContext{ draw2dbase.NewStackGraphicContext(), img, painter, raster.NewRasterizer(width, height), raster.NewRasterizer(width, height), truetype.NewGlyphBuf(), dpi, } return gc }
func (f *font) glyph(r rune) *glyph { if g, found := f.glyphs[r]; found { return g } idx := f.ttf.Index(r) gb := truetype.NewGlyphBuf() err := gb.Load(f.ttf, f.scale, idx, truetype.Hinting(truetype.FullHinting)) if err != nil { panic(err) } g := glyph(*gb) f.glyphs[r] = &g return &g }