package org.dromara.common.web.core;
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import cn.hutool.captcha.AbstractCaptcha;
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import cn.hutool.captcha.generator.CodeGenerator;
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import cn.hutool.captcha.generator.RandomGenerator;
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import cn.hutool.core.img.GraphicsUtil;
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import cn.hutool.core.img.ImgUtil;
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import cn.hutool.core.util.ObjectUtil;
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import cn.hutool.core.util.RandomUtil;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.io.Serial;
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import java.util.concurrent.ThreadLocalRandom;
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/**
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* 带干扰线、波浪、圆的验证码
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*
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* @author Lion Li
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*/
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public class WaveAndCircleCaptcha extends AbstractCaptcha {
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@Serial
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private static final long serialVersionUID = 1L;
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// 构造方法（略，与之前一致）
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public WaveAndCircleCaptcha(int width, int height) {
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this(width, height, 4);
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}
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public WaveAndCircleCaptcha(int width, int height, int codeCount) {
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this(width, height, codeCount, 6);
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}
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public WaveAndCircleCaptcha(int width, int height, int codeCount, int interfereCount) {
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this(width, height, new RandomGenerator(codeCount), interfereCount);
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}
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public WaveAndCircleCaptcha(int width, int height, CodeGenerator generator, int interfereCount) {
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super(width, height, generator, interfereCount);
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}
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public WaveAndCircleCaptcha(int width, int height, int codeCount, int interfereCount, float size) {
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super(width, height, new RandomGenerator(codeCount), interfereCount, size);
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}
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@Override
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public Image createImage(String code) {
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final BufferedImage image = new BufferedImage(
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width,
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height,
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(null == this.background) ? BufferedImage.TYPE_4BYTE_ABGR : BufferedImage.TYPE_INT_RGB
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);
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final Graphics2D g = ImgUtil.createGraphics(image, this.background);
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try {
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drawString(g, code);
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// 扭曲
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shear(g, this.width, this.height, ObjectUtil.defaultIfNull(this.background, Color.WHITE));
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drawInterfere(g);
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} finally {
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g.dispose();
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}
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return image;
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}
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private void drawString(Graphics2D g, String code) {
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// 设置抗锯齿（让字体渲染更清晰）
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g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
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g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
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if (this.textAlpha != null) {
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g.setComposite(this.textAlpha);
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}
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GraphicsUtil.drawStringColourful(g, code, this.font, this.width, this.height);
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}
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protected void drawInterfere(Graphics2D g) {
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ThreadLocalRandom random = RandomUtil.getRandom();
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int circleCount = Math.max(0, this.interfereCount - 1);
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// 圈圈
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for (int i = 0; i < circleCount; i++) {
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g.setColor(ImgUtil.randomColor(random));
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int x = random.nextInt(width);
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int y = random.nextInt(height);
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int w = random.nextInt(height >> 1);
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int h = random.nextInt(height >> 1);
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g.drawOval(x, y, w, h);
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}
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// 仅 1 条平滑波浪线
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if (this.interfereCount >= 1) {
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g.setColor(getRandomColor(120, 230, random));
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drawSmoothWave(g, random);
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}
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}
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private void drawSmoothWave(Graphics2D g, ThreadLocalRandom random) {
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int amplitude = random.nextInt(8) + 5; // 波动幅度
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int wavelength = random.nextInt(40) + 30; // 波长
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double phase = random.nextDouble() * Math.PI * 2;
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// ✅ 关键：限制 baseY 在中间区域
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int centerY = height / 2;
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int verticalJitter = Math.max(5, height / 6); // 至少偏移5像素
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int baseY = centerY - verticalJitter + random.nextInt(verticalJitter * 2);
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g.setStroke(new BasicStroke(2.5f)); // 线宽
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int[] xPoints = new int[width];
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int[] yPoints = new int[width];
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for (int x = 0; x < width; x++) {
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int y = baseY + (int) (amplitude * Math.sin((double) x / wavelength * 2 * Math.PI + phase));
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// 限制 y 不要超出图像边界（可选）
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y = Math.max(amplitude, Math.min(y, height - amplitude));
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xPoints[x] = x;
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yPoints[x] = y;
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}
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g.drawPolyline(xPoints, yPoints, width);
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}
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private Color getRandomColor(int min, int max, ThreadLocalRandom random) {
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int range = max - min;
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return new Color(
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min + random.nextInt(range),
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min + random.nextInt(range),
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min + random.nextInt(range)
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);
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}
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/**
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* 扭曲
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*
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* @param g {@link Graphics}
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* @param w1 w1
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* @param h1 h1
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* @param color 颜色
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*/
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private void shear(Graphics g, int w1, int h1, Color color) {
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shearX(g, w1, h1, color);
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shearY(g, w1, h1, color);
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}
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/**
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* X坐标扭曲
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*
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* @param g {@link Graphics}
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* @param w1 宽
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* @param h1 高
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* @param color 颜色
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*/
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private void shearX(Graphics g, int w1, int h1, Color color) {
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int period = RandomUtil.randomInt(this.width);
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int frames = 1;
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int phase = RandomUtil.randomInt(2);
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for (int i = 0; i < h1; i++) {
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double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
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g.copyArea(0, i, w1, 1, (int) d, 0);
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g.setColor(color);
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g.drawLine((int) d, i, 0, i);
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g.drawLine((int) d + w1, i, w1, i);
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}
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}
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/**
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* Y坐标扭曲
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*
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* @param g {@link Graphics}
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* @param w1 宽
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* @param h1 高
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* @param color 颜色
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*/
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private void shearY(Graphics g, int w1, int h1, Color color) {
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int period = RandomUtil.randomInt(this.height >> 1);
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int frames = 20;
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int phase = 7;
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for (int i = 0; i < w1; i++) {
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double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
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g.copyArea(i, 0, 1, h1, 0, (int) d);
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g.setColor(color);
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// 擦除原位置的痕迹
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g.drawLine(i, (int) d, i, 0);
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g.drawLine(i, (int) d + h1, i, h1);
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}
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}
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}
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