94 lines
2.5 KiB
Go
94 lines
2.5 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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package plan9font_test
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import (
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"image"
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"image/draw"
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"io/ioutil"
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"log"
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"os"
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"path"
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"path/filepath"
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"golang.org/x/exp/shiny/font"
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"golang.org/x/exp/shiny/font/plan9font"
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"golang.org/x/image/math/fixed"
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)
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func ExampleParseFont() {
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readFile := func(name string) ([]byte, error) {
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return ioutil.ReadFile(filepath.FromSlash(path.Join("../testdata/fixed", name)))
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}
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fontData, err := readFile("unicode.7x13.font")
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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.ParseFont(fontData, readFile)
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if err != nil {
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log.Fatal(err)
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}
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// TODO: derive the ascent from the face's metrics.
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const ascent = 11
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dst := image.NewRGBA(image.Rect(0, 0, 4*7, 13))
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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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Dot: fixed.P(0, ascent),
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}
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// Draw:
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// - U+0053 LATIN CAPITAL LETTER S
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// - U+03A3 GREEK CAPITAL LETTER SIGMA
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// - U+222B INTEGRAL
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// - U+3055 HIRAGANA LETTER SA
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// The testdata does not contain the CJK subfont files, so U+3055 HIRAGANA
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// LETTER SA (さ) should be rendered as U+FFFD REPLACEMENT CHARACTER (<28>).
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//
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// The missing subfont file will trigger an "open
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// ../testdata/shinonome/k12.3000: no such file or directory" log message.
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// This is expected and can be ignored.
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d.DrawString("SΣ∫さ")
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// Convert the dst image to ASCII art.
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var out []byte
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b := dst.Bounds()
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for y := b.Min.Y; y < b.Max.Y; y++ {
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out = append(out, '0'+byte(y%10), ' ')
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for x := b.Min.X; x < b.Max.X; x++ {
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if dst.RGBAAt(x, y).R > 0 {
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out = append(out, 'X')
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} else {
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out = append(out, '.')
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}
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}
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// Highlight the last row before the baseline. Glyphs like 'S' without
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// descenders should not affect any pixels whose Y coordinate is >= the
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// baseline.
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if y == ascent-1 {
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out = append(out, '_')
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}
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out = append(out, '\n')
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}
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os.Stdout.Write(out)
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// Output:
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// 0 ..................X.........
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// 1 .................X.X........
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// 2 .XXXX..XXXXXX....X.....XXX..
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// 3 X....X.X.........X....XX.XX.
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// 4 X.......X........X....X.X.X.
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// 5 X........X.......X....XXX.X.
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// 6 .XXXX.....X......X....XX.XX.
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// 7 .....X...X.......X....XX.XX.
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// 8 .....X..X........X....XXXXX.
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// 9 X....X.X.........X....XX.XX.
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// 0 .XXXX..XXXXXX....X.....XXX.._
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// 1 ...............X.X..........
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// 2 ................X...........
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}
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