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!1252 增加图形验证码文字颜色与背景颜色色差设置

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Merge pull request !1252 from czc/v5-dev
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Looly 2024-08-08 08:23:18 +00:00 committed by Gitee
commit d730347399
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4 changed files with 150 additions and 7 deletions
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75
hutool-captcha/src/test/java/cn/hutool/captcha/CaptchaUtilTest.java
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@ -1,8 +1,18 @@
package cn.hutool.captcha;
import cn.hutool.captcha.generator.CodeGenerator;
import cn.hutool.captcha.generator.MathGenerator;
import cn.hutool.core.img.GraphicsUtil;
import cn.hutool.core.img.ImgUtil;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.RandomUtil;
import org.junit.Ignore;
import org.junit.Test;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.concurrent.ThreadLocalRandom;
public class CaptchaUtilTest {
@Test
@ -12,4 +22,69 @@ public class CaptchaUtilTest {
CaptchaUtil.createShearCaptcha(320, 240);
}
}
@Test
@Ignore
public void drawStringColourfulTest() {
for(int i = 0; i < 10; i++) {
AbstractCaptcha lineCaptcha = new TestLineCaptcha(200, 100, 5, 10);
lineCaptcha.write("d:/captcha/line"+i+".png");
}
}
static class TestLineCaptcha extends AbstractCaptcha{
public TestLineCaptcha(int width, int height, int codeCount, int interfereCount) {
super(width, height, codeCount, interfereCount);
}
@Override
protected Image createImage(String code) {
// 图像buffer
final BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
final Graphics2D g = GraphicsUtil.createGraphics(image, ObjectUtil.defaultIfNull(this.background, Color.WHITE));
// 干扰线
drawInterfere(g);
// 字符串
drawString(g, code);
return image;
}
// ----------------------------------------------------------------------------------------------------- Private method start
/**
* 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);
}
GraphicsUtil.drawStringColourful(g, code, this.font, this.width, this.height,Color.WHITE,200);
}
/**
* 绘制干扰线
*
* @param g {@link Graphics2D}画笔
*/
private void drawInterfere(Graphics2D g) {
final ThreadLocalRandom random = RandomUtil.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 / 3);
int ye = ys + random.nextInt(height / 3);
g.setColor(ImgUtil.randomColor(random));
g.drawLine(xs, ys, xe, ye);
}
}
// ----------------------------------------------------------------------------------------------------- Private method start
}
}

33
hutool-core/src/main/java/cn/hutool/core/img/ColorUtil.java
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@ -179,6 +179,39 @@ public class ColorUtil {
return randomColor(null);
}
/**
* 生成随机颜色，与指定颜色有一定的区分度
*
* @param compareColor 比较颜色
* @param minDistance 最小色差，按三维坐标计算的距离值
* @return 随机颜色
* @since 5.8.30
*/
public static Color randomColor(Color compareColor,int minDistance) {
Color color = randomColor(null);
while (computeColorDistance(compareColor,color) < minDistance) {
color = randomColor(null);
}
return color;
}
/**
* 计算两个颜色之间的色差，按三维坐标距离计算
*
* @param color1 颜色1
* @param color2 颜色2
* @return 色差，按三维坐标距离值
* @since 5.8.30
*/
public static int computeColorDistance(Color color1, Color color2) {
if (null == color1 || null == color2) {
return 0;
}
return (int) Math.sqrt(Math.pow(color1.getRed() - color2.getRed(), 2)
+ Math.pow(color1.getGreen() - color2.getGreen(), 2)
+ Math.pow(color1.getBlue() - color2.getBlue(), 2));
}
/**
* 生成随机颜色
*

37
hutool-core/src/main/java/cn/hutool/core/img/GraphicsUtil.java
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@ -81,7 +81,24 @@ public class GraphicsUtil {
* @since 4.5.10
*/
public static Graphics drawStringColourful(Graphics g, String str, Font font, int width, int height) {
return drawString(g, str, font, null, width, height);
return drawString(g, str, font, null, width, height, null, 0);
}
/**
* 绘制字符串，使用随机颜色，默认抗锯齿
*
* @param g {@link Graphics}画笔
* @param str 字符串
* @param font 字体
* @param width 字符串总宽度
* @param height 字符串背景高度
* @param compareColor 用于比对的颜色
* @param minColorDistance 随机生成的颜色与对比颜色的最小色差，小于此值则重新生成颜色
* @return 画笔对象
* @since 4.5.10
*/
public static Graphics drawStringColourful(Graphics g, String str, Font font, int width, int height, Color compareColor, int minColorDistance) {
return drawString(g, str, font, null, width, height, compareColor, minColorDistance);
}
/**
@ -93,10 +110,12 @@ public class GraphicsUtil {
* @param color 字体颜色，{@code null} 表示使用随机颜色（每个字符单独随机）
* @param width 字符串背景的宽度
* @param height 字符串背景的高度
* @param compareColor 用于比对的颜色
* @param minColorDistance 随机生成的颜色与对比颜色的最小色差，小于此值则重新生成颜色
* @return 画笔对象
* @since 4.5.10
*/
public static Graphics drawString(Graphics g, String str, Font font, Color color, int width, int height) {
public static Graphics drawString(Graphics g, String str, Font font, Color color, int width, int height, Color compareColor, int minColorDistance) {
// 抗锯齿
if (g instanceof Graphics2D) {
((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
@ -115,7 +134,11 @@ public class GraphicsUtil {
for (int i = 0; i < len; i++) {
if (null == color) {
// 产生随机的颜色值，让输出的每个字符的颜色值都将不同。
g.setColor(ImgUtil.randomColor());
if (null != compareColor && minColorDistance > 0) {
g.setColor(ImgUtil.randomColor(compareColor,minColorDistance));
}else {
g.setColor(ImgUtil.randomColor());
}
}
g.drawString(String.valueOf(str.charAt(i)), i * charWidth, midY);
}
@ -181,8 +204,8 @@ public class GraphicsUtil {
/**
* 绘制图片
*
* @param g 画笔
* @param img 要绘制的图片
* @param g 画笔
* @param img 要绘制的图片
* @param point 绘制的位置，基于左上角
* @return 画笔对象
*/
@ -207,11 +230,11 @@ public class GraphicsUtil {
/**
* 设置画笔透明度
*
* @param g 画笔
* @param g 画笔
* @param alpha 透明度：alpha 必须是范围 [0.0, 1.0] 之内（包含边界值）的一个浮点数字
* @return 画笔
*/
public static Graphics2D setAlpha(Graphics2D g, float alpha){
public static Graphics2D setAlpha(Graphics2D g, float alpha) {
g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
return g;
}

12
hutool-core/src/main/java/cn/hutool/core/img/ImgUtil.java
View File

@ -2225,6 +2225,18 @@ public class ImgUtil {
return ColorUtil.randomColor();
}
/**
* 生成随机颜色，与指定颜色有一定的区分度
*
* @param compareColor 比较颜色
* @param minDistance 最小色差，按三维坐标计算的距离值
* @return 与指定颜色有一定的区分度的随机颜色
* @since 5.8.30
*/
public static Color randomColor(Color compareColor,int minDistance) {
return ColorUtil.randomColor(compareColor,minDistance);
}
/**
* 生成随机颜色
*