f551d3a6b7
The Face.Metrics method is relatively new. Also pick up the unicode.7x13.font fix from the upstream plan9port: https://plan9port-review.googlesource.com/#/c/1490/ Change-Id: Ia6e0feec4ea3c9a35e19d38aa634ca9eb6b2ffa0 Reviewed-on: https://go-review.googlesource.com/21699 Reviewed-by: Rob Pike <r@golang.org>
93 lines
2.4 KiB
Go
93 lines
2.4 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
|
||
// Use of this source code is governed by a BSD-style
|
||
// license that can be found in the LICENSE file.
|
||
|
||
package plan9font_test
|
||
|
||
import (
|
||
"image"
|
||
"image/draw"
|
||
"io/ioutil"
|
||
"log"
|
||
"os"
|
||
"path"
|
||
"path/filepath"
|
||
|
||
"golang.org/x/image/font"
|
||
"golang.org/x/image/font/plan9font"
|
||
"golang.org/x/image/math/fixed"
|
||
)
|
||
|
||
func ExampleParseFont() {
|
||
readFile := func(name string) ([]byte, error) {
|
||
return ioutil.ReadFile(filepath.FromSlash(path.Join("../testdata/fixed", name)))
|
||
}
|
||
fontData, err := readFile("unicode.7x13.font")
|
||
if err != nil {
|
||
log.Fatal(err)
|
||
}
|
||
face, err := plan9font.ParseFont(fontData, readFile)
|
||
if err != nil {
|
||
log.Fatal(err)
|
||
}
|
||
ascent := face.Metrics().Ascent.Ceil()
|
||
|
||
dst := image.NewRGBA(image.Rect(0, 0, 4*7, 13))
|
||
draw.Draw(dst, dst.Bounds(), image.Black, image.Point{}, draw.Src)
|
||
d := &font.Drawer{
|
||
Dst: dst,
|
||
Src: image.White,
|
||
Face: face,
|
||
Dot: fixed.P(0, ascent),
|
||
}
|
||
// Draw:
|
||
// - U+0053 LATIN CAPITAL LETTER S
|
||
// - U+03A3 GREEK CAPITAL LETTER SIGMA
|
||
// - U+222B INTEGRAL
|
||
// - U+3055 HIRAGANA LETTER SA
|
||
// The testdata does not contain the CJK subfont files, so U+3055 HIRAGANA
|
||
// LETTER SA (さ) should be rendered as U+FFFD REPLACEMENT CHARACTER (<28>).
|
||
//
|
||
// The missing subfont file will trigger an "open
|
||
// ../testdata/shinonome/k12.3000: no such file or directory" log message.
|
||
// This is expected and can be ignored.
|
||
d.DrawString("SΣ∫さ")
|
||
|
||
// Convert the dst image to ASCII art.
|
||
var out []byte
|
||
b := dst.Bounds()
|
||
for y := b.Min.Y; y < b.Max.Y; y++ {
|
||
out = append(out, '0'+byte(y%10), ' ')
|
||
for x := b.Min.X; x < b.Max.X; x++ {
|
||
if dst.RGBAAt(x, y).R > 0 {
|
||
out = append(out, 'X')
|
||
} else {
|
||
out = append(out, '.')
|
||
}
|
||
}
|
||
// Highlight the last row before the baseline. Glyphs like 'S' without
|
||
// descenders should not affect any pixels whose Y coordinate is >= the
|
||
// baseline.
|
||
if y == ascent-1 {
|
||
out = append(out, '_')
|
||
}
|
||
out = append(out, '\n')
|
||
}
|
||
os.Stdout.Write(out)
|
||
|
||
// Output:
|
||
// 0 ..................X.........
|
||
// 1 .................X.X........
|
||
// 2 .XXXX..XXXXXX....X.....XXX..
|
||
// 3 X....X.X.........X....XX.XX.
|
||
// 4 X.......X........X....X.X.X.
|
||
// 5 X........X.......X....XXX.X.
|
||
// 6 .XXXX.....X......X....XX.XX.
|
||
// 7 .....X...X.......X....XX.XX.
|
||
// 8 .....X..X........X....XXXXX.
|
||
// 9 X....X.X.........X....XX.XX.
|
||
// 0 .XXXX..XXXXXX....X.....XXX.._
|
||
// 1 ...............X.X..........
|
||
// 2 ................X...........
|
||
}
|