85 lines
1.9 KiB
Go
85 lines
1.9 KiB
Go
// Copyright 2016 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 (or
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// any later version), both of which can be found in the LICENSE file.
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// +build example
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//
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// This build tag means that "go install github.com/tdewolff/freetype/..."
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// doesn't install this example program. Use "go run main.go" to run it or "go
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// install -tags=example" to install it.
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package main
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import (
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"bufio"
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"fmt"
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"image"
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"image/color"
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"image/draw"
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"image/png"
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"log"
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"os"
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"github.com/tdewolff/freetype/raster"
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"golang.org/x/image/math/fixed"
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)
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func main() {
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const (
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w = 400
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h = 400
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)
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r := raster.NewRasterizer(w, h)
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r.UseNonZeroWinding = true
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cjs := []struct {
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c raster.Capper
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j raster.Joiner
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}{
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{raster.RoundCapper, raster.RoundJoiner},
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{raster.ButtCapper, raster.BevelJoiner},
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{raster.SquareCapper, raster.BevelJoiner},
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}
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for i, cj := range cjs {
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var path raster.Path
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path.Start(fixed.P(30+100*i, 30+120*i))
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path.Add1(fixed.P(180+100*i, 80+120*i))
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path.Add1(fixed.P(50+100*i, 130+120*i))
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raster.Stroke(r, path, fixed.I(20), cj.c, cj.j)
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}
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rgba := image.NewRGBA(image.Rect(0, 0, w, h))
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draw.Draw(rgba, rgba.Bounds(), image.Black, image.Point{}, draw.Src)
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p := raster.NewRGBAPainter(rgba)
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p.SetColor(color.RGBA{0x7f, 0x7f, 0x7f, 0xff})
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r.Rasterize(p)
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white := color.RGBA{0xff, 0xff, 0xff, 0xff}
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for i := range cjs {
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rgba.SetRGBA(30+100*i, 30+120*i, white)
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rgba.SetRGBA(180+100*i, 80+120*i, white)
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rgba.SetRGBA(50+100*i, 130+120*i, white)
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}
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// Save that RGBA image to disk.
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outFile, err := os.Create("out.png")
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if err != nil {
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log.Println(err)
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os.Exit(1)
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}
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defer outFile.Close()
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b := bufio.NewWriter(outFile)
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err = png.Encode(b, rgba)
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if err != nil {
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log.Println(err)
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os.Exit(1)
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}
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err = b.Flush()
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if err != nil {
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log.Println(err)
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os.Exit(1)
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}
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fmt.Println("Wrote out.png OK.")
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}
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