6.x

hutool-swing/src/main/java/cn/hutool/swing/captcha/CircleCaptcha.java

@@ -0,0 +1,100 @@
+package cn.hutool.swing.captcha;
+
+import cn.hutool.swing.img.GraphicsUtil;
+import cn.hutool.swing.img.ImgUtil;
+import cn.hutool.core.util.ObjectUtil;
+import cn.hutool.core.util.RandomUtil;
+
+import java.awt.Color;
+import java.awt.Graphics2D;
+import java.awt.Image;
+import java.awt.image.BufferedImage;
+import java.util.concurrent.ThreadLocalRandom;
+
+/**
+ * 圆圈干扰验证码
+ *
+ * @author looly
+ * @since 3.2.3
+ *
+ */
+public class CircleCaptcha extends AbstractCaptcha {
+	private static final long serialVersionUID = -7096627300356535494L;
+
+	/**
+	 * 构造
+	 *
+	 * @param width 图片宽
+	 * @param height 图片高
+	 */
+	public CircleCaptcha(int width, int height) {
+		this(width, height, 5);
+	}
+
+	/**
+	 * 构造
+	 *
+	 * @param width 图片宽
+	 * @param height 图片高
+	 * @param codeCount 字符个数
+	 */
+	public CircleCaptcha(int width, int height, int codeCount) {
+		this(width, height, codeCount, 15);
+	}
+
+	/**
+	 * 构造
+	 *
+	 * @param width 图片宽
+	 * @param height 图片高
+	 * @param codeCount 字符个数
+	 * @param interfereCount 验证码干扰元素个数
+	 */
+	public CircleCaptcha(int width, int height, int codeCount, int interfereCount) {
+		super(width, height, codeCount, interfereCount);
+	}
+
+	@Override
+	public Image createImage(String code) {
+		final BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
+		final Graphics2D g = ImgUtil.createGraphics(image, ObjectUtil.defaultIfNull(this.background, Color.WHITE));
+
+		// 随机画干扰圈圈
+		drawInterfere(g);
+
+		// 画字符串
+		drawString(g, code);
+
+		return image;
+	}
+
+	// ----------------------------------------------------------------------------------------------------- Private method start
+	/**
+	 * 绘制字符串
+	 *
+	 * @param g {@link Graphics2D}画笔
+	 * @param code 验证码
+	 */
+	private void drawString(Graphics2D g, String code) {
+		// 指定透明度
+		if (null != this.textAlpha) {
+			g.setComposite(this.textAlpha);
+		}
+		GraphicsUtil.drawStringColourful(g, code, this.font, this.width, this.height);
+	}
+
+	/**
+	 * 画随机干扰
+	 *
+	 * @param g {@link Graphics2D}
+	 */
+	private void drawInterfere(Graphics2D g) {
+		final ThreadLocalRandom random = RandomUtil.getRandom();
+
+		for (int i = 0; i < this.interfereCount; i++) {
+			g.setColor(ImgUtil.randomColor(random));
+			g.drawOval(random.nextInt(width), random.nextInt(height), random.nextInt(height >> 1), random.nextInt(height >> 1));
+		}
+	}
+	// ----------------------------------------------------------------------------------------------------- Private method end
+}