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