25c38cfec1
draw text onto an image. This is a simple API that doesn't handle line breaking, ligatures, right-to-left or vertical scripts, and other fancy features. R=r, rsc CC=golang-dev http://codereview.appspot.com/1121045
72 lines
1.6 KiB
Go
72 lines
1.6 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,
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// both of which can be found in the LICENSE file.
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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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"freetype-go.googlecode.com/hg/freetype/truetype"
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)
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var fontfile = flag.String("fontfile", "../../luxi-fonts/luxisr.ttf", "filename of the ttf font")
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func printBounds(b truetype.Bounds) {
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fmt.Printf("XMin:%d YMin:%d XMax:%d YMax:%d\n", b.XMin, b.YMin, b.XMax, b.YMax)
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}
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func printGlyph(g *truetype.GlyphBuf) {
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printBounds(g.B)
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fmt.Print("Points:\n---\n")
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e := 0
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for i, p := range g.Point {
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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.End[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.Stderr(err)
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return
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}
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font, err := truetype.Parse(b)
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if err != nil {
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log.Stderr(err)
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return
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}
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printBounds(font.Bounds())
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fmt.Printf("UnitsPerEm:%d\n\n", font.UnitsPerEm())
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c0, c1 := 'A', 'V'
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i0 := font.Index(c0)
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hm := font.HMetric(i0)
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g := truetype.NewGlyphBuf()
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err = g.Load(font, i0)
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if err != nil {
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log.Stderr(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 := font.Index(c1)
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fmt.Printf("\n'%c', '%c' Kerning:%d\n", c0, c1, font.Kerning(i0, i1))
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}
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