export

README.md

@@ -1,2 +1,14 @@
 # printImg
 print your image in your terminal by console.log
+
+## Usage
+
+```js
+const printImg = require("./index")
+
+printImg("/path/to/image/filename.jpg", {
+    width: null,
+    height: null,
+    scale: 0.5
+})
+```

index.js

@@ -0,0 +1,95 @@
+const Jimp = require('jimp');
+
+// 返回0-1的灰度值
+function rgbaToGray(r, g, b, a) {
+    // 使用加权平均法计算灰度值
+    const gray = Math.round(0.299 * r + 0.587 * g + 0.114 * b);
+
+    // 如果需要考虑透明度，可以根据需要调整
+    // 这里我们简单地返回灰度值
+    return gray / 255
+}
+
+function rgbaToRgb(r, g, b, a) {
+    a = a / 255;
+    // 使用 Alpha 通道调整亮度
+    const background = 1; // 假设背景是白色
+    const newR = Math.round((1 - a) * background + a * r);
+    const newG = Math.round((1 - a) * background + a * g);
+    const newB = Math.round((1 - a) * background + a * b);
+    return { r: newR, g: newG, b: newB };
+}
+
+// 上下两个像素点 简单平均
+function averageColor(pixel1, pixel2) {
+    const r = Math.round((pixel1.r + pixel2.r) / 2);
+    const g = Math.round((pixel1.g + pixel2.g) / 2);
+    const b = Math.round((pixel1.b + pixel2.b) / 2);
+    return { r, g, b };
+}
+
+// 格式化颜色打印
+function rgbText(r, g, b, text) {
+    return `\x1b[38;2;${r};${g};${b}m${text}`; // \x1b[0m`;
+}
+
+function getBlock(top, bottom) {
+    let block = ''
+    if (top === 0 && bottom === 0) block = " "
+    else if (top === 1 && bottom === 0) block = "▀"
+    else if (top === 0 && bottom === 1) block = "▄"
+    else if (top === 1 && bottom === 1) block = "█"
+    return block
+}
+
+module.exports = function (imagePath,{ w = null, h = null, scale = 1}) {
+
+    // 读取图像文件
+    // Jimp.Jimp.read('_data/tempQRCode.png')
+    Jimp.Jimp.read(imagePath)
+        // Jimp.Jimp.read('_data/333.jpg')
+        // Jimp.Jimp.read('_data/444.jpg')
+        // Jimp.Jimp.read('_data/555.jpg')
+        .then(async image => {
+            // image.bitmap.width * 0.2 > 200 ? image.resize({ w: width }) : image.scale(scale)
+            w && image.resize({ w })
+            h && image.resize({ h })
+            image.scale(scale)
+
+
+            const width = image.bitmap.width;
+            const height = image.bitmap.height;
+            const imageArray = [];
+
+            // 遍历每个像素并将其存储在二维数组中
+            for (let y = 0; y < height; y += 2) {
+                const row = [];
+                for (let x = 0; x < width; x++) {
+                    const pixelColor1 = image.getPixelColor(x, y);
+                    const pixelColor2 = image.getPixelColor(x, y + 1);
+                    const rgba1 = Jimp.intToRGBA(pixelColor1);
+                    const rgba2 = Jimp.intToRGBA(pixelColor2);
+                    const rgb1 = rgbaToRgb(rgba1.r, rgba1.g, rgba1.b, rgba1.a)
+                    const rgb2 = rgbaToRgb(rgba2.r, rgba2.g, rgba2.b, rgba2.a)
+                    const newRGB = averageColor(rgb1, rgb2)
+                    // rgbText(newRGB.r, newRGB.g, newRGB.b, getBlock(rgbaToGray(rgba1.r, rgba1.g, rgba1.b, rgba1.a), rgbaToGray(rgba2.r, rgba2.g, rgba2.b, rgba2.a)))
+                    const block = rgbText(newRGB.r, newRGB.g, newRGB.b, getBlock(1, 1))
+                    row.push(block);
+                }
+                imageArray.push(row); // 将行数组推入图像数组
+            }
+
+            // 打印二维数组
+            // console.log(imageArray);
+            for (let i = 0; i < imageArray.length; i++) {
+                const row = imageArray[i];
+                console.log(row.join('') + '\x1b[0m')
+            }
+        })
+        .catch(err => {
+            console.error(err);
+            console.log('finish')
+        });
+
+
+}