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// Copyright 2016 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 (
"bufio"
"fmt"
"image"
"image/color"
"image/draw"
"image/png"
"log"
"os"
"github.com/golang/freetype/raster"
"golang.org/x/image/math/fixed"
)
func main() {
const (
w = 400
h = 400
)
r := raster.NewRasterizer(w, h)
r.UseNonZeroWinding = true
cjs := []struct {
c raster.Capper
j raster.Joiner
}{
{raster.RoundCapper, raster.RoundJoiner},
{raster.ButtCapper, raster.BevelJoiner},
{raster.SquareCapper, raster.BevelJoiner},
}
for i, cj := range cjs {
var path raster.Path
path.Start(fixed.P(30+100*i, 30+120*i))
path.Add1(fixed.P(180+100*i, 80+120*i))
path.Add1(fixed.P(50+100*i, 130+120*i))
raster.Stroke(r, path, fixed.I(20), cj.c, cj.j)
}
rgba := image.NewRGBA(image.Rect(0, 0, w, h))
draw.Draw(rgba, rgba.Bounds(), image.Black, image.Point{}, draw.Src)
p := raster.NewRGBAPainter(rgba)
p.SetColor(color.RGBA{0x7f, 0x7f, 0x7f, 0xff})
r.Rasterize(p)
white := color.RGBA{0xff, 0xff, 0xff, 0xff}
for i := range cjs {
rgba.SetRGBA(30+100*i, 30+120*i, white)
rgba.SetRGBA(180+100*i, 80+120*i, white)
rgba.SetRGBA(50+100*i, 130+120*i, white)
}
// Save that RGBA image to disk.
outFile, err := os.Create("out.png")
if err != nil {
log.Println(err)
os.Exit(1)
}
defer outFile.Close()
b := bufio.NewWriter(outFile)
err = png.Encode(b, rgba)
if err != nil {
log.Println(err)
os.Exit(1)
}
err = b.Flush()
if err != nil {
log.Println(err)
os.Exit(1)
}
fmt.Println("Wrote out.png OK.")
}
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