java使用JPanel为BFS遍历设置动画

10 月 Questions & Answers 348

我正在尝试使用JPanel为BFS遍历设置动画

控制台输出显示算法正在运行

BFS: 
A B C D E F

对于给定的图表：

enter image description here

BFS片段：

public void bfs() {

    Queue q = new LinkedList();
    q.add(rootNode);
    rootNode.visited(true);
    rootNode.setColor(Color.cyan);
    printNode(rootNode);
    while (!q.isEmpty()) {

        Nodes n = (Nodes)q.remove();
        Nodes child = null;
        //put all unvisited children in the queue
        while ((child = getUnvisitedChildNode(n)) != null)
        {
            //
            child.visited(true);
            //visited color = cyan
            child.setColor(Color.cyan);
            printNode(child);
            q.add(child);

        }
    }
}

所以，我认为在JPanel上制作动画的最好方法是添加一个计时器，它每1秒调用bfs()。。。并将while循环更改为if语句。。。因此，当它被调用时，它将在每个节点上迭代一次，并将其标记为已访问

public void bfs() {

    Queue q = new LinkedList();
    q.add(rootNode);
    rootNode.visited(true);
    rootNode.setColor(Color.cyan);
    printNode(rootNode);
    if (!q.isEmpty()) {

        Nodes n = (Nodes)q.remove();
        Nodes child = null;
        //put all unvisited children in the queue
        if ((child = getUnvisitedChildNode(n)) != null)
        {
            //
            child.visited(true);
            //visited color = cyan
            child.setColor(Color.cyan);
            printNode(child);
            q.add(child);

        }
    }
    if (q.isEmpty()) {
        cancelTimer = true;
    }
}

它正在通过节点A，B，C，D，但现在不会访问B和F的子节点

enter image description here

我正在使用一个带有repaint()的paintComponent在访问时更改节点的颜色

public void paintComponent(Graphics g) {
    g.setColor(Color.BLACK);
    g.fillRect(0, 0, width, height);

    g.setColor(rootNode.getColor());
    g.fillRect(rootNode.getX(), rootNode.getY(), rootNode.getWidth(), rootNode.getHeight());

    g.setColor(Color.WHITE);
    g.drawString(rootNode.getValue(), rootNode.getX()+9, rootNode.getY()+16);
    paintComponent(g, rootNode);    
}

public void paintComponent(Graphics g, Nodes parentNode) {  
    //keep generating new nodePrintList to load with new Children
    ArrayList<Nodes> nodePrintList = new ArrayList<Nodes>();    

    //base case: end of nodeList
    if (nodeList.indexOf(parentNode)==nodeList.size()-1) {
        System.out.println("\nend");
    }
    else {  
    //traverse nodeList recursively 
        nodePrintList = getChildren(parentNode);    
        //loop through and print all children of node n
        //System.out.println();
        int x = parentNode.getX()-50;

        for (Nodes child : nodePrintList) {             
            g.setColor(child.getColor());
            child.setX(x);
            child.setY(parentNode.getY()+50);
            g.fillRect(child.getX(), child.getY(), child.getWidth(), child.getHeight());        
            g.setColor(Color.WHITE);
            g.drawString(child.getValue(), child.getX()+9, child.getY()+16);
            x+=50;
            //System.out.print("PARENT: " + parentNode.getValue() + " | x,y: " + parentNode.getX() + ", " + parentNode.getY() + "...\n CHILD: " + child.getValue() + " | x,y: " + child.getX() + ", " + child.getY());  
            paintComponent(g, child);
            g.drawLine(parentNode.getX()+10, parentNode.getY()+23, child.getX()+10, child.getY());
        }           
    }repaint();

}

知道吗

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java使用JPanel为BFS遍历设置动画

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