java输出渐变色

用Java将butterfly渐变色输出为图像

yaml配置项

# When cover is not set, the default cover is displayed (當沒有設置cover時，默認的封面顯示)
default_cover:
  - 'linear-gradient(20deg, #0062be, #925696, #cc426e, #fb0347)' # default
  - 'linear-gradient(210deg, #ff9a9e, #fad0c4, #fad0c4)' # 浪漫粉红
  - 'linear-gradient(180deg, #232526, #414345, #5e6062)' # 神秘夜空
  - 'linear-gradient(165deg, #56ab2f, #a8e063, #76ba1b)' # 热带雨林
  - 'linear-gradient(150deg, #accbee, #e7f0fd, #ffffff)' # 霜冻早晨
  - 'linear-gradient(135deg, #e6e9af, #e8c37e, #f4d03f)' # 金色沙滩
  - 'linear-gradient(120deg, #DA22FF, #9733EE, #65799B, #5E2563)' # 梦幻紫罗兰
  - 'linear-gradient(90deg, #0f2027, #203a43, #2c5364)' # 深邃宇宙
  - 'linear-gradient(75deg, #9be15d, #00e3ae, #88d8b0)' # 清新草原
  - 'linear-gradient(60deg, #ff7e5f, #feb47b, #ff7e5f, #fcb045)' # 日落黄昏
  - 'linear-gradient(45deg, #2e8b57, #48d1cc, #00ced1, #7fffd4)' # 冷静海洋风
  - 'linear-gradient(165deg, #3e5151, #decba4)' # 静谧森林
  - 'linear-gradient(150deg, #2E3192, #1BFFFF)' # 神秘海域
  - 'linear-gradient(135deg, #ee9ca7, #ffdde1)' # 晚霞光影
  - 'linear-gradient(120deg, #FF5F6D, #FFC371)' # 晨曦微光
  - 'linear-gradient(105deg, #000428, #004e92)' # 寒冬极光
  - 'linear-gradient(90deg, #D9AFD9, #97D9E1)' # 草原日落
  - 'linear-gradient(75deg, #0f0c29, #302b63, #24243e)' # 星光银河
  - 'linear-gradient(60deg, #C9FFBF, #FFAFBD, #FFF)' # 清晨露水
  - 'linear-gradient(45deg, #FFB75E, #ED8F03)' # 暖阳橙黄
  - 'linear-gradient(30deg, #5f2c82, #49a09d)' # 宁静蓝天

java源码

package org.example;

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;

public class GradientImage {
    public static void main(String[] args) throws Exception {
        int width = 400;
        int height = 200;

        // 默认渐变色
        saveGradientImage("#0062be", "#925696", "#cc426e", "#fb0347", "default");

        // 浪漫粉红
        saveGradientImage("#ff9a9e", "#fad0c4", "#fad0c4", null, "romantic_pink");

        // 神秘夜空
        saveGradientImage("#232526", "#414345", "#5e6062", null, "mysterious_night");

        // 热带雨林
        saveGradientImage("#56ab2f", "#a8e063", "#76ba1b", null, "tropical_rainforest");

        // 霜冻早晨
        saveGradientImage("#accbee", "#e7f0fd", "#ffffff", null, "frosty_morning");

        // 金色沙滩
        saveGradientImage("#e6e9af", "#e8c37e", "#f4d03f", null, "golden_beach");

        // 梦幻紫罗兰
        saveGradientImage("#DA22FF", "#9733EE", "#65799B", "#5E2563", "dreamy_violet");

        // 深邃宇宙
        saveGradientImage("#0f2027", "#203a43", "#2c5364", null, "deep_space");

        // 清新草原
        saveGradientImage("#9be15d", "#00e3ae", "#88d8b0", null, "fresh_meadow");

        // 日落黄昏
        saveGradientImage("#ff7e5f", "#feb47b", "#ff7e5f", "#fcb045", "sunset_dusk");

        // 冷静海洋风
        saveGradientImage("#2e8b57", "#48d1cc", "#00ced1", "#7fffd4", "calm_ocean_breeze");

        // 静谧森林
        saveGradientImage("#3e5151", "#decba4", null, null, "serene_forest");

        // 神秘海域
        saveGradientImage("#2E3192", "#1BFFFF", null, null, "mysterious_sea");

        // 晚霞光影
        saveGradientImage("#ee9ca7", "#ffdde1", null, null, "evening_glow");

        // 晨曦微光
        saveGradientImage("#FF5F6D", "#FFC371", null, null, "morning_glow");

        // 寒冬极光
        saveGradientImage("#000428", "#004e92", null, null, "winter_aurora");

        // 草原日落
        saveGradientImage("#D9AFD9", "#97D9E1", null, null, "prairie_sunset");

        // 星光银河
        saveGradientImage("#0f0c29", "#302b63", "#24243e", null, "starry_galaxy");

        // 清晨露水
        saveGradientImage("#C9FFBF", "#FFAFBD", "#FFF", null, "morning_dew");

        // 暖阳橙黄
        saveGradientImage("#FFB75E", "#ED8F03", null, null, "warm_sunshine");

        // 宁静蓝天
        saveGradientImage("#5f2c82", "#49a09d", null, null, "tranquil_blue_sky");
    }

    private static void saveGradientImage(String color1, String color2, String color3, String color4, String imageName)
            throws Exception {
        int width = 400;
        int height = 200;

        // 创建渐变色
        GradientPaint gradient;

        if (color4 != null) {
            gradient = new GradientPaint(0, 0, Color.decode(color1),
                    width, height, Color.decode(color4));
        } else if (color3 != null) {
            gradient = new GradientPaint(0, 0, Color.decode(color1),
                    width, height, Color.decode(color3));
        } else {
            gradient = new GradientPaint(0, 0, Color.decode(color1),
                    width, height, Color.decode(color2));
        }

        // 创建 BufferedImage 对象
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);

        // 获取 Graphics2D 对象
        Graphics2D g2d = image.createGraphics();

        // 应用渐变色
        g2d.setPaint(gradient);
        g2d.fillRect(0, 0, width, height);

        // 保存图片
        ImageIO.write(image, "png", new File("/Users/raccoon/Desktop/Wallpapers/400x200/" + imageName + ".png"));
    }
}

400x400

400x200