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/*
* Copyright (c) 2013-2024 Hutool Team and hutool.cn
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.dromara.hutool.swing.captcha;
import org.dromara.hutool.core.util.RandomUtil;
import org.dromara.hutool.swing.captcha.generator.CodeGenerator;
import org.dromara.hutool.swing.captcha.generator.RandomGenerator;
import org.dromara.hutool.swing.img.GraphicsUtil;
import org.dromara.hutool.swing.img.color.ColorUtil;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.util.concurrent.ThreadLocalRandom;
/**
* 使用干扰线方式生成的图形验证码
*
* @author looly
* @since 3.1.2
*/
public class LineCaptcha extends AbstractCaptcha {
private static final long serialVersionUID = 8691294460763091089L;
// -------------------------------------------------------------------- Constructor start
/**
* 构造,默认5位验证码,150条干扰线
*
* @param width 图片宽
* @param height 图片高
*/
public LineCaptcha(final int width, final int height) {
this(width, height, 5, 150);
}
/**
* 构造
*
* @param width 图片宽
* @param height 图片高
* @param codeCount 字符个数
* @param lineCount 干扰线条数
*/
public LineCaptcha(final int width, final int height, final int codeCount, final int lineCount) {
this(width, height, new RandomGenerator(codeCount), lineCount);
}
/**
* 构造
*
* @param width 图片宽
* @param height 图片高
* @param generator 验证码生成器
* @param interfereCount 验证码干扰元素个数
*/
public LineCaptcha(final int width, final int height, final CodeGenerator generator, final int interfereCount) {
super(width, height, generator, interfereCount);
}
/**
* 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
* @param sizeBaseHeight 字体的大小 高度的倍数
*/
public LineCaptcha(final int width, final int height, final int codeCount, final int interfereCount, final float sizeBaseHeight) {
super(width, height, new RandomGenerator(codeCount), interfereCount, sizeBaseHeight);
}
// -------------------------------------------------------------------- Constructor end
@Override
public Image createImage(final String code) {
// 图像buffer
final BufferedImage image = new BufferedImage(width, height, (null == this.background) ? BufferedImage.TYPE_4BYTE_ABGR : BufferedImage.TYPE_INT_RGB);
final Graphics2D g = GraphicsUtil.createGraphics(image, this.background);
try {
// 干扰线
drawInterfere(g);
// 字符串
drawString(g, code);
} finally {
g.dispose();
}
return image;
}
// ----------------------------------------------------------------------------------------------------- Private method start
/**
* 绘制字符串
*
* @param g {@link Graphics}画笔
* @param code 验证码
*/
private void drawString(final Graphics2D g, final 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);
}
/**
* 绘制干扰线
*
* @param g {@link Graphics2D}画笔
*/
private void drawInterfere(final Graphics2D g) {
final ThreadLocalRandom random = RandomUtil.getRandom();
// 干扰线
for (int i = 0; i < this.interfereCount; i++) {
final int xs = random.nextInt(width);
final int ys = random.nextInt(height);
final int xe = xs + random.nextInt(width / 8);
final int ye = ys + random.nextInt(height / 8);
g.setColor(ColorUtil.randomColor(random));
g.drawLine(xs, ys, xe, ye);
}
}
// ----------------------------------------------------------------------------------------------------- Private method start
}