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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.ObjUtil;
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.color.ColorUtil;
import org.dromara.hutool.swing.img.GraphicsUtil;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
/**
* 扭曲干扰验证码
*
* @author looly
* @since 3.2.3
*/
public class ShearCaptcha extends AbstractCaptcha {
private static final long serialVersionUID = -7096627300356535494L;
/**
* 构造
*
* @param width 图片宽
* @param height 图片高
*/
public ShearCaptcha(final int width, final 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 ShearCaptcha(final int width, final int height, final int codeCount) {
this(width, height, codeCount, 4);
}
/**
* 构造
*
* @param width 图片宽
* @param height 图片高
* @param codeCount 字符个数
* @param thickness 干扰线宽度
*/
public ShearCaptcha(final int width, final int height, final int codeCount, final int thickness) {
this(width, height, new RandomGenerator(codeCount), thickness);
}
/**
* 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 ShearCaptcha(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 ShearCaptcha(final int width, final int height, final int codeCount, final int interfereCount, final float sizeBaseHeight) {
super(width, height, new RandomGenerator(codeCount), interfereCount, sizeBaseHeight);
}
@Override
public Image createImage(final String code) {
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 {
// 画字符串
drawString(g, code);
// 扭曲
shear(g, this.width, this.height, ObjUtil.defaultIfNull(this.background, Color.WHITE));
// 画干扰线
drawInterfere(g, 0, RandomUtil.randomInt(this.height) + 1, this.width, RandomUtil.randomInt(this.height) + 1, this.interfereCount, ColorUtil.randomColor());
} 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);
}
/**
* 扭曲
*
* @param g {@link Graphics}
* @param w1 w1
* @param h1 h1
* @param color 颜色
*/
private void shear(final Graphics g, final int w1, final int h1, final Color color) {
shearX(g, w1, h1, color);
shearY(g, w1, h1, color);
}
/**
* X坐标扭曲
*
* @param g {@link Graphics}
* @param w1 宽
* @param h1 高
* @param color 颜色
*/
private void shearX(final Graphics g, final int w1, final int h1, final Color color) {
final int period = RandomUtil.randomInt(this.width);
final int frames = 1;
final int phase = RandomUtil.randomInt(2);
for (int i = 0; i < h1; i++) {
final double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
g.copyArea(0, i, w1, 1, (int) d, 0);
g.setColor(color);
g.drawLine((int) d, i, 0, i);
g.drawLine((int) d + w1, i, w1, i);
}
}
/**
* Y坐标扭曲
*
* @param g {@link Graphics}
* @param w1 宽
* @param h1 高
* @param color 颜色
*/
private void shearY(final Graphics g, final int w1, final int h1, final Color color) {
final int period = RandomUtil.randomInt(this.height >> 1);
final int frames = 20;
final int phase = 7;
for (int i = 0; i < w1; i++) {
final double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
g.copyArea(i, 0, 1, h1, 0, (int) d);
g.setColor(color);
// 擦除原位置的痕迹
g.drawLine(i, (int) d, i, 0);
g.drawLine(i, (int) d + h1, i, h1);
}
}
/**
* 干扰线
*
* @param g {@link Graphics}
* @param x1 x1
* @param y1 y1
* @param x2 x2
* @param y2 y2
* @param thickness 粗细
* @param c 颜色
*/
@SuppressWarnings("SameParameterValue")
private void drawInterfere(final Graphics g, final int x1, final int y1, final int x2, final int y2, final int thickness, final Color c) {
// The thick line is in fact a filled polygon
g.setColor(c);
final int dX = x2 - x1;
final int dY = y2 - y1;
// line length
final double lineLength = Math.sqrt(dX * dX + dY * dY);
final double scale = (double) (thickness) / (2 * lineLength);
// The x and y increments from an endpoint needed to create a
// rectangle...
double ddx = -scale * (double) dY;
double ddy = scale * (double) dX;
ddx += (ddx > 0) ? 0.5 : -0.5;
ddy += (ddy > 0) ? 0.5 : -0.5;
final int dx = (int) ddx;
final int dy = (int) ddy;
// Now we can compute the corner points...
final int[] xPoints = new int[4];
final int[] yPoints = new int[4];
xPoints[0] = x1 + dx;
yPoints[0] = y1 + dy;
xPoints[1] = x1 - dx;
yPoints[1] = y1 - dy;
xPoints[2] = x2 - dx;
yPoints[2] = y2 - dy;
xPoints[3] = x2 + dx;
yPoints[3] = y2 + dy;
g.fillPolygon(xPoints, yPoints, 4);
}
// ----------------------------------------------------------------------------------------------------- Private method end
}
