增加内置字体，增加贝赛尔曲线干扰线

src/main/java/com/wf/captcha/SpecCaptcha.java

@@ -1,5 +1,7 @@
 package com.wf.captcha;
 
+import com.wf.captcha.base.Captcha;
+
 import java.awt.*;
 import java.awt.image.BufferedImage;
 import java.io.IOException;
@@ -40,7 +42,6 @@ public class SpecCaptcha extends Captcha {
      */
     @Override
     public boolean out(OutputStream out) {
-        checkAlpha();
         return graphicsImage(textChar(), out);
     }
 
@@ -52,51 +53,51 @@ public class SpecCaptcha extends Captcha {
      * @return boolean
      */
     private boolean graphicsImage(char[] strs, OutputStream out) {
-        boolean ok;
         try {
             BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
             Graphics2D g = (Graphics2D) bi.getGraphics();
+            // 填充背景
             g.setColor(Color.WHITE);
             g.fillRect(0, 0, width, height);
             // 抗锯齿
             g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
             g.setStroke(new BasicStroke(1.3f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
             // 随机画干扰线
-            drawLine(3, g);
+            // drawLine(3, g);
             // 随机画干扰圆
-            drawOval(8, g);
+            // drawOval(8, g);
+            drawBesselLine(2, g);
             // 画字符串
-            AlphaComposite ac3 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.8f);// 指定透明度
-            g.setComposite(ac3);
-            int hp = (height - font.getSize()) >> 1;
-            int h = height - hp;
-            int w = width / strs.length;
-            int sp = (w - font.getSize()) / 2;
+            // AlphaComposite ac3 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.8f);// 指定透明度
+            // g.setComposite(ac3);
+            g.setFont(getFont());
+            int fontSize = getFont().getSize();
+            int fY = height - ((height - fontSize) >> 1);  // 文字的纵坐标
+            int fW = width / strs.length;  // 每一个字符所占的宽度
+            int fSp = (fW - fontSize) / 2;  // 字符的左右边距
             for (int i = 0; i < strs.length; i++) {
-                g.setColor(new Color(20 + num(110), 20 + num(110), 20 + num(110)));
+                g.setColor(color());
                 // 计算坐标
-                int x = i * w + sp + num(3);
-                int y = h - num(3, 6);
-                if (x < 8) {
+                int x = i * fW + fSp;
+                int y = fY/* - num(3, 6)*/;
+                /*if (x < 8) {
                     x = 8;
                 }
-                if (x + font.getSize() > width) {
-                    x = width - font.getSize();
-                }
-                if (y > height) {
+                if (x + fontSize > width) {
+                    x = width - fontSize;
+                }*/
+                /*if (y > height) {
                     y = height;
                 }
-                if (y - font.getSize() < 0) {
-                    y = font.getSize();
-                }
-                g.setFont(font.deriveFont(num(2) == 0 ? Font.PLAIN : Font.ITALIC));
+                if (y - fontSize < 0) {
+                    y = fontSize;
+                }*/
                 g.drawString(String.valueOf(strs[i]), x, y);
             }
             ImageIO.write(bi, "png", out);
             out.flush();
-            ok = true;
+            return true;
         } catch (IOException e) {
-            ok = false;
             e.printStackTrace();
         } finally {
             try {
@@ -105,6 +106,6 @@ public class SpecCaptcha extends Captcha {
                 e.printStackTrace();
             }
         }
-        return ok;
+        return false;
     }
 }