drawpanel.java~9~

源程序（包括最初的版本

package App;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 2.0(2005.7.5)加入图形界面
 */
import javax.swing.*;
import java.awt.* ;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.border.*;

public class DrawPanel
    extends JPanel {
  Table t ;

  public DrawPanel() {
    t=new Table();
  }
  public DrawPanel(Table t){
    this.t=t;
  }

  /**画布边框(35,15,600,420)即wide=565 high=415
    *画节点的区域为（35，15，600，400）
    *节点半径r=20
    */
  public void paintComponent(Graphics g) {
    super.paintComponent(g);

    //画边框
    //g.setColor(Color.blue);
    //t.setTable();
    //Dimension d=new Dimension();
    //d=this.getSize();
    //g.drawString(d.getWidth()+"  "+d.getHeight(),100,100);
    //this.setSize(new Dimension(630,500));
    //g.drawRect(0+35,0+15,600,420);
    if(t.isEmpty()==true){
      //画白框
      g.setColor(Color.white);
      g.fillRect(0 + 35, 0 + 15, 600, 420);
    }

    else{
      //画白框
      g.setColor(Color.white);
      g.fillRect(0 + 35, 0 + 15, 600, 420);
      //画线
      for (int i = 1; t.tables[i] != null; i++) {
        if (i > 0) {
          paintLine(g, t.tables[t.tables[i].parents], t.tables[i]);

        }
      }
      //画点
      for (int i = 0; t.tables[i] != null; i++) {
        paintNode(g, t.tables[i]);
      }
    }
  }

  /**画点*/
  public void paintNode(Graphics g, TableNode nodes) {
    //locateName(name)
    int r=20;
    g.setColor(Color.RED);
    g.drawOval(nodes.getX(), nodes.getY(), 20, 20); //圆圈半径为20
    g.setColor(Color.white);
    g.fillOval(nodes.getX() + 1, nodes.getY() + 1, 19, 19);
    g.setColor(Color.BLACK);
    g.drawString(nodes.name.toString(), nodes.getX() + 7,
                 nodes.getY() + 14);
  }

  /**画线*/
  public void paintLine(Graphics g, TableNode nodes1, TableNode nodes2) {
    g.setColor(Color.BLACK);
    g.drawLine(nodes1.getX(), nodes1.getY() , nodes2.getX(),
               nodes2.getY() );
  }

  public void setTable(Table table){
    t=table;
  }
}