107 lines
2.4 KiB
Go
107 lines
2.4 KiB
Go
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that 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 golang.org/x/image/..." doesn't
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// install this example program. Use "go run main.go" to run it or "go install
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// -tags=example" to install it.
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// Font is a basic example of using fonts.
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package main
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import (
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"flag"
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"image"
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"image/color"
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"image/draw"
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"image/png"
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"io/ioutil"
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"log"
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"os"
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"path/filepath"
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"strings"
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"golang.org/x/image/font"
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"golang.org/x/image/font/plan9font"
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"golang.org/x/image/math/fixed"
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)
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var (
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fontFlag = flag.String("font", "",
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`filename of the Plan 9 font or subfont file, such as "lucsans/unicode.8.font" or "lucsans/lsr.14"`)
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firstRuneFlag = flag.Int("firstrune", 0, "the Unicode code point of the first rune in the subfont file")
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)
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func pt(p fixed.Point26_6) image.Point {
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return image.Point{
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X: int(p.X+32) >> 6,
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Y: int(p.Y+32) >> 6,
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}
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}
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func main() {
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flag.Parse()
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// TODO: mmap the files.
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if *fontFlag == "" {
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flag.Usage()
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log.Fatal("no font specified")
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}
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var face font.Face
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if strings.HasSuffix(*fontFlag, ".font") {
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fontData, err := ioutil.ReadFile(*fontFlag)
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if err != nil {
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log.Fatal(err)
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}
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dir := filepath.Dir(*fontFlag)
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face, err = plan9font.ParseFont(fontData, func(name string) ([]byte, error) {
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return ioutil.ReadFile(filepath.Join(dir, filepath.FromSlash(name)))
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})
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if err != nil {
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log.Fatal(err)
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}
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} else {
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fontData, err := ioutil.ReadFile(*fontFlag)
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if err != nil {
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log.Fatal(err)
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}
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face, err = plan9font.ParseSubfont(fontData, rune(*firstRuneFlag))
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if err != nil {
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log.Fatal(err)
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}
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}
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dst := image.NewRGBA(image.Rect(0, 0, 800, 300))
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draw.Draw(dst, dst.Bounds(), image.Black, image.Point{}, draw.Src)
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d := &font.Drawer{
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Dst: dst,
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Src: image.White,
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Face: face,
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}
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ss := []string{
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"The quick brown fox jumps over the lazy dog.",
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"Hello, 世界.",
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"U+FFFD is \ufffd.",
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}
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for i, s := range ss {
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d.Dot = fixed.P(20, 100*i+80)
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dot0 := pt(d.Dot)
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d.DrawString(s)
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dot1 := pt(d.Dot)
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dst.SetRGBA(dot0.X, dot0.Y, color.RGBA{0xff, 0x00, 0x00, 0xff})
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dst.SetRGBA(dot1.X, dot1.Y, color.RGBA{0x00, 0x00, 0xff, 0xff})
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}
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out, err := os.Create("out.png")
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if err != nil {
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log.Fatal(err)
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}
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defer out.Close()
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if err := png.Encode(out, dst); err != nil {
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log.Fatal(err)
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}
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}
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