stat.java

课程设计－－ 学生成绩管理系统。。用NetBeans编写

/*
 * Stat.java
 *
 * Created on 2005年10月29日, 上午10:36
 */

/**
 *
 * @author isaac
 */
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;


public class Stat extends JDialog {
    
    /** Creates a new instance of Stat */
    public Stat(StuFrame sf) {
        super(sf,"成绩分布统计对话框",true);
        setSize(400,300);
        owner=sf;
        a= Math.round(owner.statArr[0]*3.6f);
        b=Math.round(owner.statArr[1]*3.6f);
        c=Math.round(owner.statArr[2]*3.6f);
        d=Math.round(owner.statArr[3]*3.6f);
        setContentPane(new StatPanel());
        
    }
    
    class StatPanel extends JPanel {
        public void paintComponent(Graphics g) {
            super.paintComponents(g);
            g.setColor(Color.YELLOW);
            g.fillArc(x,y, w, w,0,a);//绘制饼图的"优秀"弧断
            g.fillRect(190, 40, 10, 10);
            g.setColor(Color.GREEN);
            g.fillArc(x,y, w, w,a,b);//绘制饼图的"良好"弧断
            g.fillRect(190,90,  10, 10);
            g.setColor(Color.BLUE);
            g.fillArc(x,y, w, w,a+b,c);//绘制饼图的"中等"弧断
            g.fillRect(190,140,  10, 10);
            g.setColor(Color.RED);
            g.fillArc(x,y, w, w,a+b+c,d);//绘制饼图的"不及格"弧断
            g.fillRect(190,190,  10, 10);
            g.setColor(Color.BLACK);
            g.drawString("成绩优秀（100-90）人数占"+Math.round(owner.statArr[0]*100)/100.0+"%",200,50);
            g.drawString("成绩良好（89-75）人数占"+Math.round(owner.statArr[1]*100)/100.0+"%",200,100);
            g.drawString("成绩中等（74-60）人数占"+Math.round(owner.statArr[2]*100)/100.0+"%",200,150);
            g.drawString("成绩不及格（59-0）人数占"+Math.round(owner.statArr[3]*100)/100.0+"%",200,200);
        }
    }
    
    int a,b,c,d;//分布弧断
    int x=20;
    int y=50;
    int w=160;
    StuFrame owner;
}