渐变图导出

复制from PIL import Image, ImageDraw

# 创建 400x200 的渐变图像（水平方向：红→蓝）
width, height = 400, 200
img = Image.new('RGB', (width, height))
draw = ImageDraw.Draw(img)

for x in range(width):
    # 计算该列颜色：红色分量递减，蓝色分量递增
    r = int(255 * (1 - x / width))
    b = int(255 * (x / width))
    color = (r, 0, b)
    draw.line([(x, 0), (x, height)], fill=color)

img.save('gradient.png')
print('已生成 gradient.png')

复制package main

import (
	"image"
	"image/color"
	"image/png"
	"os"
)

func main() {
	width, height := 400, 200
	img := image.NewRGBA(image.Rect(0, 0, width, height))

	for x := 0; x < width; x++ {
		// 水平渐变：红→蓝
		r := uint8(255 * (1 - float64(x)/float64(width)))
		b := uint8(255 * float64(x) / float64(width))
		for y := 0; y < height; y++ {
			img.Set(x, y, color.RGBA{r, 0, b, 255})
		}
	}

	f, _ := os.Create("gradient.png")
	defer f.Close()
	png.Encode(f, img)
}

复制const { createCanvas } = require('canvas');
const fs = require('fs');

const width = 400;
const height = 200;
const canvas = createCanvas(width, height);
const ctx = canvas.getContext('2d');

// 水平渐变：红→蓝
const gradient = ctx.createLinearGradient(0, 0, width, 0);
gradient.addColorStop(0, 'rgb(255, 0, 0)');
gradient.addColorStop(1, 'rgb(0, 0, 255)');

ctx.fillStyle = gradient;
ctx.fillRect(0, 0, width, height);

const buffer = canvas.toBuffer('image/png');
fs.writeFileSync('gradient.png', buffer);
console.log('已生成 gradient.png');