drawpanel.java

源程序（包括最初的版本

package treeandbtreedemo;

/**
 * <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
 * @version 2.1(2005.7.5)初步加入动画和线程,产生节点的遍历动画效果
 * @version 2.2(2005.7.6)在基础架构中添加了二叉树类，把树和二叉树两种结构分开来做了
 */
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 ;//表格数据
  String function;//进行某种操作的标志
  int current;//控制动画时所要画的节点

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

  /**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=10
    */
  public void paintComponent(Graphics g) {
    super.paintComponent(g);
     if(t.tables[0]==null)
      paintInit(g);
    else{
      if (function != null && function.equals("start") == true) {
        paintTree(g);
        //repaint();
      }
      if (function != null && function.equals("travel") == true) {
        paintTree(g);
        fillTravelNode(g, current);
        //g.setColor(Color.RED);
        //g.drawOval(t.tables[current].getX()-r, t.tables[current].getY()-r, r*2,r*2); //圆圈直径为20
        //g.setColor(Color.BLUE);
        //g.fillOval(t.tables[current].getX()-r + 1, t.tables[current].getY()-r + 1, r*2-1, r*2-1);

        //nextNode(i){
        repaint();

      }
      /*if (function != null && function.equals("postTravel") == true) {
        paintTree(g);
        fillTravelNode(g, current);
        repaint();
      }*/
    }

    //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]);
      }
    }*/
  }
  public void paintInit(Graphics g){
      //super.paintComponent(g);
      //画白框
      //g.setColor(Color.white);
      //g.fillRect(0 + 35, 0 + 15, 600, 420);
    }

    public void paintTree(Graphics g){
      //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]);
      }

      //repaint();
  }

  /**画点*/
  public void paintNode(Graphics g, TableNode nodes) {
    //locateName(name)
    int r=10;//圆圈半径为10
    g.setColor(Color.RED);
    g.drawOval(nodes.getX()+this.getWidth()/2-r,
               nodes.getY()+this.getHeight()/8-r,
               r*2,r*2); //圆圈直径为20
    g.setColor(Color.white);
    g.fillOval(nodes.getX()+this.getWidth()/2-r + 1,
               nodes.getY()+this.getHeight()/8-r + 1,
               r*2-1, r*2-1);
    g.setColor(Color.BLACK);
    g.drawString(nodes.name.toString(),
                 nodes.getX()+this.getWidth()/2-r + 7,
                 nodes.getY()+this.getHeight()/8-r + 14);
  }

  /**画线*/
  public void paintLine(Graphics g, TableNode nodes1, TableNode nodes2) {
    g.setColor(Color.BLACK);
    g.drawLine(nodes1.getX()+this.getWidth()/2,
               nodes1.getY()+this.getHeight()/8 ,
               nodes2.getX()+this.getWidth()/2,
               nodes2.getY()+this.getHeight()/8);
  }

  /**设置表格*/
  public void setTable(Table table){
    t=table;
  }

  /**设置所要进行的操作*/
  public void setFunction(String f){
   function=f;
  }

  public void setCurrent(int c){
    current=c;
  }

  public void fillTravelNode(Graphics g,int c){
    int r=10;//圆圈半径为10
    current=c;
    g.setColor(Color.RED);
    g.drawOval(t.tables[current].getX()+this.getWidth()/2-r,
               t.tables[current].getY()+this.getHeight()/8-r,
               r*2,r*2); //圆圈直径为20
    g.setColor(Color.BLUE);
    g.fillOval(t.tables[current].getX()+this.getWidth()/2-r + 1,
               t.tables[current].getY()+this.getHeight()/8-r + 1,
               r*2-1, r*2-1);
    g.setColor(Color.BLACK);
    g.drawString(t.tables[current].name.toString(),
                 t.tables[current].getX()+this.getWidth()/2-r + 7,
                 t.tables[current].getY()+this.getHeight()/8-r + 14);


  }


}