如何绘制表示连接节点图的树? [英] How to draw a tree representing a graph of connected nodes?
问题描述
我想在 Java GUI 中显示一棵树,但我不知道如何.树表示连接节点的图形,如下所示:
I want to display a tree in a Java GUI, but I dont know how. The tree represents a graph of connected nodes, like this:
我应该说我有自己的树类:
I should say that I have my own tree class:
public class BinaryTree
{
private BinaryNode root;
public BinaryTree( )
{
root = null;
}
public BinaryTree( Object rootItem )
{
root = new BinaryNode( rootItem, null, null );
}
public BinaryTree( Object rootItem,BinaryNode a,BinaryNode b )
{
root = new BinaryNode( rootItem, a, b );
}
public int leavesCount(){
return BinaryNode.leavesCount(root);
}
public boolean equal(BinaryTree a,BinaryTree b){
return BinaryNode.equal(a.root, b.root);
}
public void printPreOrder( )
{
if( root != null )
root.printPreOrder( );
}
public void printInOrder( )
{
if( root != null )
root.printInOrder( );
}
public void printPostOrder( )
{
if( root != null )
root.printPostOrder( );
}
public void makeEmpty( )
{
root = null;
}
public boolean isEmpty( )
{
return root == null;
}
public void merge( Object rootItem, BinaryTree t1, BinaryTree t2 ) throws MergeAbrot
{
if( t1.root == t2.root && t1.root != null )
{
throw new MergeAbrot("MergeAbrot");
}
root=new BinaryNode( rootItem, t1.root, t2.root );
if( this != t1 )
t1.root = null;
if( this != t2 )
t2.root = null;
}
public int size( )
{
return BinaryNode.size( root );
}
public int height( )
{
return BinaryNode.height( root );
}
}
我只想画树.我该怎么办?
I only want to draw the tree. How should I do?
推荐答案
我能想到的最简单的方法就是写一个扩展 JPanel
并覆盖它的 paintComponent()
的类代码>方法.在paint方法中,您可以遍历树并绘制每个节点.这是一个简短的例子:
The simplest way I can think of is to write a class that extends JPanel
and override its paintComponent()
method. In the paint method you can iterate through the tree and paint each node. Here is a short example:
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class JPanelTest extends JPanel {
@Override
public void paintComponent(Graphics g) {
// Draw Tree Here
g.drawOval(5, 5, 25, 25);
}
public static void main(String[] args) {
JFrame jFrame = new JFrame();
jFrame.add(new JPanelTest());
jFrame.setSize(500, 500);
jFrame.setVisible(true);
}
}
尝试绘制树,如果您无法弄清楚,请发布您在问题中尝试过的内容.
Take a stab at painting the tree, if you can't figure it out post what you've tried in your question.
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