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Diffstat (limited to 'vendor/github.com/golang/freetype/example/drawer/main.go')
| -rw-r--r-- | vendor/github.com/golang/freetype/example/drawer/main.go | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/vendor/github.com/golang/freetype/example/drawer/main.go b/vendor/github.com/golang/freetype/example/drawer/main.go new file mode 100644 index 000000000..d26d066d9 --- /dev/null +++ b/vendor/github.com/golang/freetype/example/drawer/main.go @@ -0,0 +1,158 @@ +// Copyright 2015 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" + "flag" + "fmt" + "image" + "image/color" + "image/draw" + "image/png" + "io/ioutil" + "log" + "math" + "os" + + "github.com/golang/freetype/truetype" + "golang.org/x/image/font" + "golang.org/x/image/math/fixed" +) + +var ( + dpi = flag.Float64("dpi", 72, "screen resolution in Dots Per Inch") + fontfile = flag.String("fontfile", "../../testdata/luxisr.ttf", "filename of the ttf font") + hinting = flag.String("hinting", "none", "none | full") + size = flag.Float64("size", 12, "font size in points") + spacing = flag.Float64("spacing", 1.5, "line spacing (e.g. 2 means double spaced)") + wonb = flag.Bool("whiteonblack", false, "white text on a black background") +) + +const title = "Jabberwocky" + +var text = []string{ + "’Twas brillig, and the slithy toves", + "Did gyre and gimble in the wabe;", + "All mimsy were the borogoves,", + "And the mome raths outgrabe.", + "", + "“Beware the Jabberwock, my son!", + "The jaws that bite, the claws that catch!", + "Beware the Jubjub bird, and shun", + "The frumious Bandersnatch!”", + "", + "He took his vorpal sword in hand:", + "Long time the manxome foe he sought—", + "So rested he by the Tumtum tree,", + "And stood awhile in thought.", + "", + "And as in uffish thought he stood,", + "The Jabberwock, with eyes of flame,", + "Came whiffling through the tulgey wood,", + "And burbled as it came!", + "", + "One, two! One, two! and through and through", + "The vorpal blade went snicker-snack!", + "He left it dead, and with its head", + "He went galumphing back.", + "", + "“And hast thou slain the Jabberwock?", + "Come to my arms, my beamish boy!", + "O frabjous day! Callooh! Callay!”", + "He chortled in his joy.", + "", + "’Twas brillig, and the slithy toves", + "Did gyre and gimble in the wabe;", + "All mimsy were the borogoves,", + "And the mome raths outgrabe.", +} + +func main() { + flag.Parse() + + // Read the font data. + fontBytes, err := ioutil.ReadFile(*fontfile) + if err != nil { + log.Println(err) + return + } + f, err := truetype.Parse(fontBytes) + if err != nil { + log.Println(err) + return + } + + // Draw the background and the guidelines. + fg, bg := image.Black, image.White + ruler := color.RGBA{0xdd, 0xdd, 0xdd, 0xff} + if *wonb { + fg, bg = image.White, image.Black + ruler = color.RGBA{0x22, 0x22, 0x22, 0xff} + } + const imgW, imgH = 640, 480 + rgba := image.NewRGBA(image.Rect(0, 0, imgW, imgH)) + draw.Draw(rgba, rgba.Bounds(), bg, image.ZP, draw.Src) + for i := 0; i < 200; i++ { + rgba.Set(10, 10+i, ruler) + rgba.Set(10+i, 10, ruler) + } + + // Draw the text. + h := font.HintingNone + switch *hinting { + case "full": + h = font.HintingFull + } + d := &font.Drawer{ + Dst: rgba, + Src: fg, + Face: truetype.NewFace(f, &truetype.Options{ + Size: *size, + DPI: *dpi, + Hinting: h, + }), + } + y := 10 + int(math.Ceil(*size**dpi/72)) + dy := int(math.Ceil(*size * *spacing * *dpi / 72)) + d.Dot = fixed.Point26_6{ + X: (fixed.I(imgW) - d.MeasureString(title)) / 2, + Y: fixed.I(y), + } + d.DrawString(title) + y += dy + for _, s := range text { + d.Dot = fixed.P(10, y) + d.DrawString(s) + y += dy + } + + // 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.") +} |