电子印章代码，不是我写的，当字号为24号时，个别汉字变形，求原因？

[xiaosc]

package com.hangar.pdf;
/**
@version 1.31 2004-05-03
@author Cay Horstmann
*/

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.geom.AffineTransform;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class DrawTest
{
public static void main(String[] args)
{
DrawFrame frame = new DrawFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}

/**
A frame that contains a panel with drawings
*/
class DrawFrame extends JFrame
{
public DrawFrame()
{
setTitle("DrawTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

// add panel to frame
DrawPanel panel = new DrawPanel();
panel.setBackground(Color.WHITE);
setLocationRelativeTo(null);
add(panel, BorderLayout.CENTER);
}

public static final int DEFAULT_WIDTH = 320;
public static final int DEFAULT_HEIGHT = 340;
}

/**
A panel that displays rectangles and ellipses.
*/
class DrawPanel extends JPanel
{
private String message = "公章测试有限公司测试电子印章";

public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setColor(Color.RED);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

//绘制圆
int radius = 150;
Ellipse2D circle = new Ellipse2D.Double();
circle.setFrameFromCenter(CENTERX, CENTERY, CENTERX + radius, CENTERY + radius);
g2.draw(circle);

//绘制中间的五角星
Font starFont = new Font("宋体", Font.BOLD, 120);
g2.setFont(starFont);
g2.drawString("*", CENTERX - 60, CENTERY + 40);

//根据输入字符串得到字符数组
String[] messages2 = message.split("",0);
String[] messages = new String[messages2.length-1];
System.arraycopy(messages2,1,messages,0,messages2.length-1);

//输入的字数
int ilength = messages.length;

//设置字体属性，字体为24号时，个别文字变形
int fontsize = 24
Font f = new Font("Serif", Font.BOLD, fontsize);

FontRenderContext context = g2.getFontRenderContext();
Rectangle2D bounds = f.getStringBounds(message, context);

//字符宽度＝字符串长度/字符数
double char_interval = (bounds.getWidth() / ilength);
//上坡度
double ascent = -bounds.getY();

int first = 0,second = 0;
boolean odd = false;
if (ilength%2 == 1)
{
first = (ilength-1)/2;
odd = true;
}
else
{
first = (ilength)/2-1;
second = (ilength)/2;
odd = false;
}

double radius2 = radius - ascent;
double x0 = CENTERX;
double y0 = CENTERY - radius + ascent;
//旋转角度
double a = 2*Math.asin(char_interval/(2*radius2));

if (odd)
{
g2.setFont(f);
g2.drawString(messages[first], (float)(x0 - char_interval/2), (float)y0);

//中心点的右边
for (int i=first+1;i<ilength;i++)
{
double aa = (i - first) * a;
double ax = radius2 * Math.sin(aa);
double ay = radius2 - radius2 * Math.cos(aa);
AffineTransform transform = AffineTransform.getRotateInstance(aa);//,x0 + ax, y0 + ay);
Font f2 = f.deriveFont(transform);
g2.setFont(f2);
g2.drawString(messages[i], (float)(x0 + ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay - char_interval/2* Math.sin(aa)));
}
//中心点的左边
for (int i=first-1;i>-1;i--)
{
double aa = (first - i) * a;
double ax = radius2 * Math.sin(aa);
double ay = radius2 - radius2 * Math.cos(aa);
AffineTransform transform = AffineTransform.getRotateInstance(-aa);//,x0 + ax, y0 + ay);
Font f2 = f.deriveFont(transform);
g2.setFont(f2);
g2.drawString(messages[i], (float)(x0 - ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay + char_interval/2* Math.sin(aa)));
}

}
else
{
//中心点的右边
for (int i=second;i<ilength;i++)
{
double aa = (i - second + 0.5) * a;
double ax = radius2 * Math.sin(aa);
double ay = radius2 - radius2 * Math.cos(aa);
AffineTransform transform = AffineTransform.getRotateInstance(aa);//,x0 + ax, y0 + ay);
Font f2 = f.deriveFont(transform);
g2.setFont(f2);
g2.drawString(messages[i], (float)(x0 + ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay - char_interval/2* Math.sin(aa)));
}

//中心点的左边
for (int i=first;i>-1;i--)
{
double aa = (first - i + 0.5) * a;
double ax = radius2 * Math.sin(aa);
double ay = radius2 - radius2 * Math.cos(aa);
AffineTransform transform = AffineTransform.getRotateInstance(-aa);//,x0 + ax, y0 + ay);
Font f2 = f.deriveFont(transform);
g2.setFont(f2);
g2.drawString(messages[i], (float)(x0 - ax - char_interval/2* Math.cos(aa)), (float)(y0 + ay + char_interval/2* Math.sin(aa)));
}
}

}
public static final int CENTERX = 150;
public static final int CENTERY = 150;
}