90 lines
2.1 KiB
Go
90 lines
2.1 KiB
Go
// Copyright 2010 The Freetype-Go Authors. All rights reserved.
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// Use of this source code is governed by your choice of either the
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// FreeType License or the GNU General Public License version 2 (or
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// any later version), both of which can be found in the LICENSE file.
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// +build example
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//
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// This build tag means that "go install github.com/golang/freetype/..."
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// doesn't install this example program. Use "go run main.go" to run it or "go
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// install -tags=example" to install it.
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package main
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import (
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"github.com/golang/freetype/truetype"
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"golang.org/x/image/font"
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"golang.org/x/image/math/fixed"
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)
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var fontfile = flag.String("fontfile", "../../testdata/luxisr.ttf", "filename of the ttf font")
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func printBounds(b fixed.Rectangle26_6) {
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fmt.Printf("Min.X:%d Min.Y:%d Max.X:%d Max.Y:%d\n", b.Min.X, b.Min.Y, b.Max.X, b.Max.Y)
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}
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func printGlyph(g *truetype.GlyphBuf) {
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printBounds(g.Bounds)
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fmt.Print("Points:\n---\n")
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e := 0
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for i, p := range g.Points {
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fmt.Printf("%4d, %4d", p.X, p.Y)
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if p.Flags&0x01 != 0 {
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fmt.Print(" on\n")
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} else {
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fmt.Print(" off\n")
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}
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if i+1 == int(g.Ends[e]) {
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fmt.Print("---\n")
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e++
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}
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}
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}
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func main() {
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flag.Parse()
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fmt.Printf("Loading fontfile %q\n", *fontfile)
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b, err := ioutil.ReadFile(*fontfile)
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if err != nil {
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log.Println(err)
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return
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}
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f, err := truetype.Parse(b)
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if err != nil {
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log.Println(err)
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return
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}
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fupe := fixed.Int26_6(f.FUnitsPerEm())
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printBounds(f.Bounds(fupe))
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fmt.Printf("FUnitsPerEm:%d\n\n", fupe)
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c0, c1 := 'A', 'V'
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i0 := f.Index(c0)
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hm := f.HMetric(fupe, i0)
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g := &truetype.GlyphBuf{}
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err = g.Load(f, fupe, i0, font.HintingNone)
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if err != nil {
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log.Println(err)
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return
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}
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fmt.Printf("'%c' glyph\n", c0)
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fmt.Printf("AdvanceWidth:%d LeftSideBearing:%d\n", hm.AdvanceWidth, hm.LeftSideBearing)
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printGlyph(g)
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i1 := f.Index(c1)
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fmt.Printf("\n'%c', '%c' Kern:%d\n", c0, c1, f.Kern(fupe, i0, i1))
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fmt.Printf("\nThe numbers above are in FUnits.\n" +
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"The numbers below are in 26.6 fixed point pixels, at 12pt and 72dpi.\n\n")
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a := truetype.NewFace(f, &truetype.Options{
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Size: 12,
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DPI: 72,
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})
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fmt.Printf("%#v\n", a.Metrics())
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}
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