ASCII Art 文字

复制from PIL import Image, ImageDraw, ImageFont

# 将文字渲染为图像，再按像素亮度映射为 ASCII 字符
text = "Hello"
font_size = 20
font = ImageFont.truetype("arial.ttf", font_size)

# 计算文字尺寸
img = Image.new("L", (1, 1), 255)
draw = ImageDraw.Draw(img)
bbox = draw.textbbox((0, 0), text, font=font)
w, h = bbox[2] - bbox[0], bbox[3] - bbox[1]

# 渲染文字到灰度图
img = Image.new("L", (w, h), 255)
draw = ImageDraw.Draw(img)
draw.text((0, 0), text, font=font, fill=0)

# 亮度映射字符（从暗到亮）
chars = "@%#*+=-:. "
scale = 255 / (len(chars) - 1)

pixels = img.load()
for y in range(h):
    line = ""
    for x in range(w):
        idx = min(int(pixels[x, y] / scale), len(chars) - 1)
        line += chars[idx]
    print(line)

复制package main

import (
	"fmt"
	"image"
	"image/color"
	"image/png"
	"os"
	"strings"

	"golang.org/x/image/font"
	"golang.org/x/image/font/basicfont"
	"golang.org/x/image/math/fixed"
)

func main() {
	text := "Go"
	face := basicfont.Face7x13

	// 计算文字边界
	w := 0
	for _, r := range text {
		adv, ok := face.GlyphAdvance(r)
		if ok {
			w += adv.Ceil()
		}
	}
	h := face.Metrics().Ascent.Ceil() + face.Metrics().Descent.Ceil()

	// 创建灰度图
	img := image.NewGray(image.Rect(0, 0, w, h))
	drawer := font.Drawer{
		Dst:  img,
		Src:  image.NewUniform(color.White),
		Face: face,
		Dot:  fixed.P(0, face.Metrics().Ascent.Ceil()),
	}
	drawer.DrawString(text)

	// 像素 → ASCII
	chars := "@%#*+=-:. "
	scale := 255.0 / float64(len(chars)-1)

	for y := 0; y < h; y++ {
		var line strings.Builder
		for x := 0; x < w; x++ {
			gray := img.GrayAt(x, y).Y
			idx := int(float64(gray) / scale)
			if idx >= len(chars) {
				idx = len(chars) - 1
			}
			line.WriteByte(chars[idx])
		}
		fmt.Println(line.String())
	}
}

复制// 浏览器环境：利用 Canvas 渲染文字，读取像素亮度
function textToAscii(text, charSet = '@%#*+=-:. ') {
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');
  
  // 测量文字尺寸
  ctx.font = '20px monospace';
  const metrics = ctx.measureText(text);
  const w = Math.ceil(metrics.width);
  const h = 30; // 固定高度
  
  canvas.width = w;
  canvas.height = h;
  
  // 白底黑字
  ctx.fillStyle = 'white';
  ctx.fillRect(0, 0, w, h);
  ctx.fillStyle = 'black';
  ctx.font = '20px monospace';
  ctx.fillText(text, 0, 20);
  
  // 读取像素
  const imageData = ctx.getImageData(0, 0, w, h);
  const pixels = imageData.data;
  
  const scale = 255 / (charSet.length - 1);
  let result = '';
  
  for (let y = 0; y < h; y++) {
    for (let x = 0; x < w; x++) {
      const idx = (y * w + x) * 4;
      const gray = pixels[idx]; // R 通道（黑白图 R=G=B）
      const charIdx = Math.min(Math.floor(gray / scale), charSet.length - 1);
      result += charSet[charIdx];
    }
    result += '\n';
  }
  
  return result;
}

console.log(textToAscii('Hello'));