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@@ -3,219 +3,216 @@ package cn.hutool.captcha;
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import cn.hutool.core.img.gif.AnimatedGifEncoder;
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import cn.hutool.core.util.ObjectUtil;
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+import cn.hutool.core.util.RandomUtil;
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-import java.awt.*;
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+import java.awt.AlphaComposite;
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+import java.awt.Color;
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+import java.awt.Graphics2D;
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+import java.awt.Image;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayOutputStream;
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-import java.util.Random;
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/**
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* Gif验证码类
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+ *
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+ * @author hsoftxl
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+ * @since 5.5.2
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*/
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public class GifCaptcha extends AbstractCaptcha {
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- private static final long serialVersionUID = 7091627304326538464L;
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-
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- private final Random RANDOM = new Random();
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- // 帧延迟 (默认100)
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- private int delay = 100;
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- //量化器取样间隔 - 默认是10ms
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- private int quality = 10;
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- // 帧循环次数
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- private int repeat = 0;
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- //设置随机颜色时,最小的取色范围
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- private int minColor = 0;
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- //设置随机颜色时,最大的取色范围
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- private int maxColor = 255;
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-
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-
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- /**
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- * 可以设置验证码宽度,高度的构造函数
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- *
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- * @param width -验证码宽度
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- * @param height -验证码高度
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- */
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- public GifCaptcha(int width, int height) {
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- this(width, height, 100);
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- }
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-
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- /**
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- * @param width -验证码宽度
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- * @param height -验证码高度
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- * @param codeCount -验证码个数
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- */
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- public GifCaptcha(int width, int height, int codeCount) {
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- super(width, height, codeCount, 10);
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- }
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-
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- /**
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- * 设置图像的颜色量化(转换质量 由GIF规范允许的最大256种颜色)。
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- * 低的值(最小值= 1)产生更好的颜色,但处理显著缓慢。
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- * 10是默认,并产生良好的颜色而且有以合理的速度。
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- * 值更大(大于20)不产生显著的改善速度
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- *
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- * @param quality 大于1
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- */
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- public void setQuality(int quality) {
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- if (quality < 1) {
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- quality = 1;
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- }
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- this.quality = quality;
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- }
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-
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- /**
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- * 设置GIF帧应该播放的次数。
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- * 默认是 0; 0意味着无限循环。
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- * 必须在添加的第一个图像之前被调用。
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- *
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- * @param repeat 必须大于等于0
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- */
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- public void setRepeat(int repeat) {
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- if (repeat >= 0) {
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- this.repeat = repeat;
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- }
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- }
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-
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- /**
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- * 设置验证码字符颜色
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- *
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- * @param maxColor 颜色
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- */
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- public void setMaxColor(int maxColor) {
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- this.maxColor = maxColor;
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- }
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-
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- /**
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- * 设置验证码字符颜色
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- *
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- * @param minColor 颜色
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- */
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- public void setMinColor(int minColor) {
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- this.minColor = minColor;
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- }
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-
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- @Override
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- public void createCode() {
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- generateCode();
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- final ByteArrayOutputStream out = new ByteArrayOutputStream();
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-
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- AnimatedGifEncoder gifEncoder = new AnimatedGifEncoder();// gif编码类
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- //生成字符
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- gifEncoder.start(out);
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- gifEncoder.setQuality(quality);//设置量化器取样间隔
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- gifEncoder.setDelay(delay);//设置帧延迟
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- gifEncoder.setRepeat(repeat);//帧循环次数
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- BufferedImage frame;
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- char[] chars = code.toCharArray();
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- Color[] fontColor = new Color[chars.length];
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- for (int i = 0; i < chars.length; i++) {
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- fontColor[i] = getRandomColor(minColor, maxColor);
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- frame = graphicsImage(chars, fontColor, chars, i);
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- gifEncoder.addFrame(frame);
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- frame.flush();
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- }
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- gifEncoder.finish();
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- this.imageBytes = out.toByteArray();
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- }
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-
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- @Override
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- protected Image createImage(String code) {
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- return null;
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- }
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-
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- /**
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- * 画随机码图
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- *
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- * @param fontColor 随机字体颜色
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- * @param words 字符数组
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- * @param flag 透明度使用
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- * @return BufferedImage
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- */
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- private BufferedImage graphicsImage(char[] chars, Color[] fontColor, char[] words, int flag) {
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- BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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- //或得图形上下文
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- Graphics2D g2d = image.createGraphics();
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- //利用指定颜色填充背景
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- g2d.setColor(ObjectUtil.defaultIfNull(this.background, Color.WHITE));
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- g2d.fillRect(0, 0, width, height);
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- AlphaComposite ac;
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- // 字符的y坐标
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- float y = (height >> 1) + (font.getSize() >> 1);
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- float m = 1.0f * (width - (chars.length * font.getSize())) / chars.length;
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- //字符的x坐标
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- float x = Math.max(m / 2.0f, 2);
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- g2d.setFont(font);
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- // 指定透明度
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- if (null != this.textAlpha) {
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- g2d.setComposite(this.textAlpha);
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- }
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- for (int i = 0; i < chars.length; i++) {
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- ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, getPellucidity(chars.length, flag, i));
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- g2d.setComposite(ac);
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- g2d.setColor(fontColor[i]);
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- g2d.drawOval(num(width), num(height), num(5, 30), 5 + num(5, 30));//绘制椭圆边框
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- g2d.drawString(words[i] + "", x + (font.getSize() + m) * i, y);
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- }
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- g2d.dispose();
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- return image;
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- }
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-
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- /**
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- * 获取透明度,从0到1,自动计算步长
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- *
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- * @return float 透明度
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- */
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- private float getPellucidity(int v, int i, int j) {
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- int num = i + j;
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- float r = (float) 1 / v;
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- float s = (v + 1) * r;
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- return num > v ? (num * r - s) : num * r;
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- }
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-
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- /**
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- * 通过给定范围获得随机的颜色
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- *
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- * @return Color 获得随机的颜色
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- */
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- private Color getRandomColor(int min, int max) {
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- if (min > 255) {
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- min = 255;
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- }
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- if (max > 255) {
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- max = 255;
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- }
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- if (min < 0) {
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- min = 0;
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- }
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- if (max < 0) {
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- max = 0;
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- }
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- if (min > max) {
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- min = 0;
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- max = 255;
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- }
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- return new Color(min + num(max - min), min + num(max - min), min + num(max - min));
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- }
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-
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-
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- /**
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- * 产生两个数之间的随机数
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- *
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- * @param min 小数
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- * @param max 比min大的数
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- * @return int 随机数字
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- */
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- private int num(int min, int max) {
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- return min + RANDOM.nextInt(max - min);
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- }
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-
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- /**
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- * 产生0--num的随机数,不包括num
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- *
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- * @param num 数字
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- * @return int 随机数字
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- */
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- private int num(int num) {
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- return RANDOM.nextInt(num);
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- }
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-
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+ private static final long serialVersionUID = 7091627304326538464L;
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+
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+ //量化器取样间隔 - 默认是10ms
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+ private int quality = 10;
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+ // 帧循环次数
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+ private int repeat = 0;
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+ //设置随机颜色时,最小的取色范围
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+ private int minColor = 0;
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+ //设置随机颜色时,最大的取色范围
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+ private int maxColor = 255;
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+
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+
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+ /**
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+ * 可以设置验证码宽度,高度的构造函数
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+ *
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+ * @param width 验证码宽度
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+ * @param height 验证码高度
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+ */
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+ public GifCaptcha(int width, int height) {
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+ this(width, height, 100);
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+ }
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+
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+ /**
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+ * @param width 验证码宽度
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+ * @param height 验证码高度
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+ * @param codeCount 验证码个数
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+ */
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+ public GifCaptcha(int width, int height, int codeCount) {
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+ super(width, height, codeCount, 10);
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+ }
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+
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+ /**
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+ * 设置图像的颜色量化(转换质量 由GIF规范允许的最大256种颜色)。
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+ * 低的值(最小值= 1)产生更好的颜色,但处理显著缓慢。
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+ * 10是默认,并产生良好的颜色而且有以合理的速度。
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+ * 值更大(大于20)不产生显著的改善速度
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+ *
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+ * @param quality 大于1
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+ * @return this
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+ */
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+ public GifCaptcha setQuality(int quality) {
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+ if (quality < 1) {
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+ quality = 1;
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+ }
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+ this.quality = quality;
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+ return this;
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+ }
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+
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+ /**
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+ * 设置GIF帧应该播放的次数。
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+ * 默认是 0; 0意味着无限循环。
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+ * 必须在添加的第一个图像之前被调用。
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+ *
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+ * @param repeat 必须大于等于0
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+ * @return this
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+ */
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+ public GifCaptcha setRepeat(int repeat) {
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+ if (repeat >= 0) {
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+ this.repeat = repeat;
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+ }
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+ return this;
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+ }
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+
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+ /**
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+ * 设置验证码字符颜色
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+ *
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+ * @param maxColor 颜色
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+ * @return this
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+ */
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+ public GifCaptcha setMaxColor(int maxColor) {
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+ this.maxColor = maxColor;
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+ return this;
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+ }
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+
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+ /**
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+ * 设置验证码字符颜色
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+ *
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+ * @param minColor 颜色
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+ * @return this
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+ */
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+ public GifCaptcha setMinColor(int minColor) {
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+ this.minColor = minColor;
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+ return this;
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+ }
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+
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+ @Override
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+ public void createCode() {
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+ generateCode();
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+ final ByteArrayOutputStream out = new ByteArrayOutputStream();
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+
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+ AnimatedGifEncoder gifEncoder = new AnimatedGifEncoder();// gif编码类
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+ //生成字符
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+ gifEncoder.start(out);
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+ gifEncoder.setQuality(quality);//设置量化器取样间隔
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+ // 帧延迟 (默认100)
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+ int delay = 100;
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+ gifEncoder.setDelay(delay);//设置帧延迟
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+ gifEncoder.setRepeat(repeat);//帧循环次数
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+ BufferedImage frame;
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+ char[] chars = code.toCharArray();
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+ Color[] fontColor = new Color[chars.length];
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+ for (int i = 0; i < chars.length; i++) {
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+ fontColor[i] = getRandomColor(minColor, maxColor);
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+ frame = graphicsImage(chars, fontColor, chars, i);
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+ gifEncoder.addFrame(frame);
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+ frame.flush();
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+ }
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+ gifEncoder.finish();
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+ this.imageBytes = out.toByteArray();
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+ }
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+
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+ @Override
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+ protected Image createImage(String code) {
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+ return null;
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+ }
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+
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+ /**
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+ * 画随机码图
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+ *
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+ * @param fontColor 随机字体颜色
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+ * @param words 字符数组
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+ * @param flag 透明度使用
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+ * @return BufferedImage
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+ */
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+ private BufferedImage graphicsImage(char[] chars, Color[] fontColor, char[] words, int flag) {
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+ BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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+ //或得图形上下文
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+ Graphics2D g2d = image.createGraphics();
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+ //利用指定颜色填充背景
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+ g2d.setColor(ObjectUtil.defaultIfNull(this.background, Color.WHITE));
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+ g2d.fillRect(0, 0, width, height);
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+ AlphaComposite ac;
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+ // 字符的y坐标
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+ float y = (height >> 1) + (font.getSize() >> 1);
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+ float m = 1.0f * (width - (chars.length * font.getSize())) / chars.length;
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+ //字符的x坐标
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+ float x = Math.max(m / 2.0f, 2);
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+ g2d.setFont(font);
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+ // 指定透明度
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+ if (null != this.textAlpha) {
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+ g2d.setComposite(this.textAlpha);
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+ }
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+ for (int i = 0; i < chars.length; i++) {
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+ ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, getAlpha(chars.length, flag, i));
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+ g2d.setComposite(ac);
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+ g2d.setColor(fontColor[i]);
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+ g2d.drawOval(
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+ RandomUtil.randomInt(width),
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+ RandomUtil.randomInt(height),
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+ RandomUtil.randomInt(5, 30), 5 + RandomUtil.randomInt(5, 30)
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+ );//绘制椭圆边框
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+ g2d.drawString(words[i] + "", x + (font.getSize() + m) * i, y);
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+ }
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+ g2d.dispose();
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+ return image;
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+ }
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+
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+ /**
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+ * 获取透明度,从0到1,自动计算步长
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+ *
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+ * @return float 透明度
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+ */
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+ private float getAlpha(int v, int i, int j) {
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+ int num = i + j;
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+ float r = (float) 1 / v;
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+ float s = (v + 1) * r;
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+ return num > v ? (num * r - s) : num * r;
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+ }
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+
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+ /**
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+ * 通过给定范围获得随机的颜色
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+ *
|
|
|
+ * @return Color 获得随机的颜色
|
|
|
+ */
|
|
|
+ private Color getRandomColor(int min, int max) {
|
|
|
+ if (min > 255) {
|
|
|
+ min = 255;
|
|
|
+ }
|
|
|
+ if (max > 255) {
|
|
|
+ max = 255;
|
|
|
+ }
|
|
|
+ if (min < 0) {
|
|
|
+ min = 0;
|
|
|
+ }
|
|
|
+ if (max < 0) {
|
|
|
+ max = 0;
|
|
|
+ }
|
|
|
+ if (min > max) {
|
|
|
+ min = 0;
|
|
|
+ max = 255;
|
|
|
+ }
|
|
|
+ return new Color(
|
|
|
+ RandomUtil.randomInt(min, max),
|
|
|
+ RandomUtil.randomInt(min, max),
|
|
|
+ RandomUtil.randomInt(min, max));
|
|
|
+ }
|
|
|
}
|