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* The MIT License (MIT) *
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package org.aoju.bus.extra.captcha.provider;
import org.aoju.bus.core.toolkit.ImageKit;
import org.aoju.bus.core.toolkit.ObjectKit;
import org.aoju.bus.core.toolkit.RandomKit;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.concurrent.ThreadLocalRandom;
/**
* 普通干扰线验证码
*
* @author Kimi Liu
* @since Java 17+
*/
public class LineProvider extends AbstractProvider {
/**
* 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 LineProvider(int width, 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 LineProvider(int width, int height, int codeCount, int lineCount) {
super(width, height, codeCount, lineCount);
}
@Override
public Image createImage(String code) {
// 图像buffer
final BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
final Graphics2D g = org.aoju.bus.core.lang.Graphics.createGraphics(image, ObjectKit.defaultIfNull(this.background, Color.WHITE));
// 干扰线
drawInterfere(g);
// 字符串
drawString(g, code);
return image;
}
/**
* 绘制字符串
*
* @param g {@link Graphics}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);
}
org.aoju.bus.core.lang.Graphics.drawStringColourful(g, code, this.font, this.width, this.height);
}
/**
* 绘制干扰线
*
* @param g {@link Graphics2D}画笔
*/
private void drawInterfere(Graphics2D g) {
final ThreadLocalRandom random = RandomKit.getRandom();
// 干扰线
for (int i = 0; i < this.interfereCount; i++) {
int xs = random.nextInt(width);
int ys = random.nextInt(height);
int xe = xs + random.nextInt(width / 8);
int ye = ys + random.nextInt(height / 8);
g.setColor(ImageKit.randomColor(random));
g.drawLine(xs, ys, xe, ye);
}
}
}
