| // Copyright 2020 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package opentype_test |
| |
| import ( |
| "fmt" |
| "image" |
| "image/color" |
| "log" |
| "os" |
| |
| "golang.org/x/image/font" |
| "golang.org/x/image/font/gofont/goitalic" |
| "golang.org/x/image/font/opentype" |
| "golang.org/x/image/math/fixed" |
| ) |
| |
| func ExampleNewFace() { |
| const ( |
| width = 72 |
| height = 36 |
| startingDotX = 6 |
| startingDotY = 28 |
| ) |
| |
| f, err := opentype.Parse(goitalic.TTF) |
| if err != nil { |
| log.Fatalf("Parse: %v", err) |
| } |
| face, err := opentype.NewFace(f, &opentype.FaceOptions{ |
| Size: 32, |
| DPI: 72, |
| Hinting: font.HintingNone, |
| }) |
| if err != nil { |
| log.Fatalf("NewFace: %v", err) |
| } |
| |
| dst := image.NewGray(image.Rect(0, 0, width, height)) |
| d := font.Drawer{ |
| Dst: dst, |
| Src: image.White, |
| Face: face, |
| Dot: fixed.P(startingDotX, startingDotY), |
| } |
| fmt.Printf("The dot is at %v\n", d.Dot) |
| d.DrawString("jel") |
| fmt.Printf("The dot is at %v\n", d.Dot) |
| d.Src = image.NewUniform(color.Gray{0x7F}) |
| d.DrawString("ly") |
| fmt.Printf("The dot is at %v\n", d.Dot) |
| |
| const asciiArt = ".++8" |
| buf := make([]byte, 0, height*(width+1)) |
| for y := 0; y < height; y++ { |
| for x := 0; x < width; x++ { |
| c := asciiArt[dst.GrayAt(x, y).Y>>6] |
| if c != '.' { |
| // No-op. |
| } else if x == startingDotX-1 { |
| c = ']' |
| } else if y == startingDotY-1 { |
| c = '_' |
| } |
| buf = append(buf, c) |
| } |
| buf = append(buf, '\n') |
| } |
| os.Stdout.Write(buf) |
| |
| // Output: |
| // The dot is at {6:00 28:00} |
| // The dot is at {41:32 28:00} |
| // The dot is at {66:48 28:00} |
| // .....].................................................................. |
| // .....].................................................................. |
| // .....].................................................................. |
| // .....]..................................+++......+++.................... |
| // .....]........+++.......................888......+++.................... |
| // .....].......+88+......................+88+......+++.................... |
| // .....].......888+......................+88+.....+++..................... |
| // .....].......888+......................+88+.....+++..................... |
| // .....].................................888......+++..................... |
| // .....].................................888......+++..................... |
| // .....]....................++..........+88+......+++..................... |
| // .....]......+88+.......+888888+.......+88+.....+++....+++..........++... |
| // .....]......888......+888888888+......+88+.....+++....++++........+++... |
| // .....]......888.....+888+...+888......888......+++.....+++........++.... |
| // .....].....+888....+888......+88+.....888......+++.....+++.......+++.... |
| // .....].....+88+....888.......+88+....+88+......+++.....+++......+++..... |
| // .....].....+88+...+888.......+88+....+88+.....+++......+++......+++..... |
| // .....].....888....888+++++++++88+....+88+.....+++......+++.....+++...... |
| // .....].....888....88888888888888+....888......+++......++++....++....... |
| // .....]....+888...+88888888888888.....888......+++.......+++...+++....... |
| // .....]....+88+...+888...............+888......+++.......+++..+++........ |
| // .....]....+88+...+888...............+88+.....+++........+++..+++........ |
| // .....]....888....+888...............+88+.....+++........+++.+++......... |
| // .....]....888....+888...............888......+++........++++++.......... |
| // .....]...+888.....888+..............888......+++........++++++.......... |
| // .....]...+88+.....+8888+....++8.....888+.....++++........++++........... |
| // .....]...+88+......+8888888888+.....+8888....+++++.......++++........... |
| // _____]___888________+88888888++______+888_____++++_______+++____________ |
| // .....]...888...........+++.............++................+++............ |
| // .....]..+88+............................................+++............. |
| // .....]..+88+...........................................+++.............. |
| // .....].+888............................................+++.............. |
| // ....888888............................................+++............... |
| // ....88888............................................++++............... |
| // ....+++................................................................. |
| // .....].................................................................. |
| } |