Java 绘制未被调用的组件
我正试图编写一个小的迷宫运行程序,但遇到了一些与paintComponent()相关的问题。我已经完成了调试,由于某种原因,我的paintComponent()从未被调用,即使我的计时器正在调用repaint()Java 绘制未被调用的组件,java,swing,jframe,jpanel,paintcomponent,Java,Swing,Jframe,Jpanel,Paintcomponent,我正试图编写一个小的迷宫运行程序,但遇到了一些与paintComponent()相关的问题。我已经完成了调试,由于某种原因,我的paintComponent()从未被调用,即使我的计时器正在调用repaint() private void jpanelinit() { JPanel Background = new JPanel (new BorderLayout()); JPanel Menu = new JPanel (new BorderLa
private void jpanelinit() {
JPanel Background = new JPanel (new BorderLayout());
JPanel Menu = new JPanel (new BorderLayout());
JPanel Maze = new JPanel (new GridLayout(arow, acolumn));
Background.setPreferredSize(new Dimension(850,850));
Menu.setPreferredSize(new Dimension(850, 100));
Maze.setPreferredSize(new Dimension(850,750));
frame.add(Background);
comboboxinit();
Background.add(Menu, BorderLayout.NORTH);
Background.add(Maze, BorderLayout.SOUTH);
Menu.add(Startpause, BorderLayout.WEST);
Menu.add(Reset, BorderLayout.EAST);
Menu.add(Intervalpick, BorderLayout.CENTER);
Intervalpick.setVisible(true);
Intervalpick.addActionListener(this);
Startpause.setVisible(true);
Startpause.addActionListener(this);
Reset.setVisible(true);
Reset.addActionListener(this);
Maze.setVisible(true);
}
private static void frameinit() {
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setSize(850,850);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
}
这些是我的frame和jpanelinit方法
@Override
public void paintComponent(Graphics g){
System.out.println("Entered Graphics");
super.paintComponent(g);
g.drawImage(biWall,0,100,850,750, this );
}
这是我的paintComponent,图像确实已缓冲并已存储
public void actionPerformed(ActionEvent e) {
if(e.getSource()==Intervalpick)
timecheck(); //Checks if the time was changed
if(e.getSource()==Startpause||e.getSource()==Reset)
buttoncheck(e); //Checks if the buttons were pressed
if(t.isRunning())
mazeupdate();
}
private void mazeupdate() {
repaint();
}
这是我的actionPerformed,它是用我的计时器调用的,默认设置为5秒的间隔
public class mazerunner extends JPanel implements ActionListener {
static JButton Startpause = new JButton("Start");
static JButton Reset = new JButton("Reset");
static JComboBox Intervalpick= new JComboBox();
static JFrame frame=new JFrame ("Maze Runner");
static int arow=0, acolumn=0, icurrenttime=5000;
static boolean gameplaying=false;
static Timer t;
static BufferedImage biWall, biFloor, biMouse, biCheese;
public static void main(String[] args) {
mazerunner mr= new mazerunner();
filereader(); //Reads the file
imagebuffer(); //Buffers the images
mr.jpanelinit(); //Inits the gui
frameinit(); //Inits the frame
mr.timerinit(); //Inits the timer
}
private static void imagebuffer() {
try{
biWall=ImageIO.read(new File("cobblewall.jpg"));
}
catch(IOException e){}
try{
biFloor=ImageIO.read(new File("woodenfloor.jpg"));
}
catch(IOException e){}
try{
biCheese=ImageIO.read(new File("chest_cheese.jpg"));
}
catch(IOException e){}
try{
biMouse=ImageIO.read(new File("lara_mouse.jpg"));
}
catch(IOException e){}
}
private void timerinit() {
t=new Timer(icurrenttime,this);
}
private void jpanelinit() {
JPanel Background = new JPanel (new BorderLayout()); //Inits all the JPanels
JPanel Menu = new JPanel (new BorderLayout());
JPanel Maze = new JPanel (new GridLayout(arow, acolumn));
Background.setPreferredSize(new Dimension(850,850)); //Sets the size of the panels
Menu.setPreferredSize(new Dimension(850, 100));
Maze.setPreferredSize(new Dimension(850,750));
frame.add(Background); //Adds background into the frame
comboboxinit();
Background.add(Menu, BorderLayout.NORTH); //Adds the other panels into the background
Background.add(Maze, BorderLayout.SOUTH);
Menu.add(Startpause, BorderLayout.WEST); //Adds the menu's components into the menu panel
Menu.add(Reset, BorderLayout.EAST);
Menu.add(Intervalpick, BorderLayout.CENTER);
Intervalpick.setVisible(true); //Sets the components to visible and adds actionlistener
Intervalpick.addActionListener(this);
Startpause.setVisible(true);
Startpause.addActionListener(this);
Reset.setVisible(true);
Reset.addActionListener(this);
Maze.setVisible(true);
}
private static void comboboxinit() {
for(int a=5;a<=30;a=a+5){ //Sets the text inside the combobox
Intervalpick.addItem(a+" Seconds");
}
DefaultListCellRenderer dlcr = new DefaultListCellRenderer(); //Centers the text inside the combobox
dlcr.setHorizontalAlignment(DefaultListCellRenderer.CENTER);
Intervalpick.setRenderer(dlcr);
}
private static void frameinit() {
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Inits the jframe
frame.setResizable(false);
frame.setSize(850,850);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
}
private static void filereader() {
try{
FileReader fr=new FileReader("maze.txt");
BufferedReader br= new BufferedReader(fr);
String LineIn=br.readLine();
int num, row=0;
arow=Integer.parseInt(LineIn);
LineIn=br.readLine();
acolumn=Integer.parseInt(LineIn);
int Maze[][]=new int[arow][acolumn]; //inits the maze itself
LineIn=br.readLine();
do{ //stores the maze from the file into the arrray
int collumn=0;
StringTokenizer tokens=new StringTokenizer(LineIn);
while (tokens.hasMoreTokens()){
num=Integer.parseInt(tokens.nextToken());
Maze[row][collumn]=num;
collumn++;
}
LineIn=br.readLine();
row++;
}while(LineIn!=null);
br.close();
fr.close();
}
catch(FileNotFoundException e){
System.err.println("file not found");
}
catch(IOException e){
System.err.println("read failed");
}
}
@Override
public void paintComponent(Graphics g){
System.out.println("Entered Graphics");
super.paintComponent(g);
g.drawImage(biWall,0,100,850,750, this );
}
public void actionPerformed(ActionEvent e) {
if(e.getSource()==Intervalpick)
timecheck(); //Checks if the time was changed
if(e.getSource()==Startpause||e.getSource()==Reset)
buttoncheck(e); //Checks if the buttons were pressed
if(t.isRunning())
mazeupdate();
}
private void mazeupdate() {
repaint();
}
private void buttoncheck(ActionEvent e) {
if(e.getSource()==Startpause){ //Starts and pauses the simulation
if(gameplaying==false){
gameplaying=true;
t.start();
Startpause.setText("Pause");
}
else if(gameplaying==true){
gameplaying=false;
t.stop();
Startpause.setText("Start");
}
}
else if(e.getSource()==Reset){ //Resets the maze to the original maze
if(t.isRunning())
t.stop();
gameplaying=false;
Startpause.setText("Start");
filereader();
// t.repaint();
}
}
private void timecheck() {
int boxtime= Integer.parseInt(((String) Intervalpick.getSelectedItem()).split(" ")[0])*1000; //Turns Intervalpick into a milisecond amount
if(boxtime!=icurrenttime){ //Checks if the selected delay is equal to the actual delay
boolean gamerunning=false;
icurrenttime=boxtime;
if(t.isRunning()){ //Stops timer if running
t.stop();
gamerunning=true;
}
t.setDelay(icurrenttime); //Changes delay
if(gamerunning==true) //If timer was running it turns it back on
t.start();
}
}
公共类mazerunner扩展JPanel实现ActionListener{
静态按钮开始使用=新按钮(“开始”);
静态JButton Reset=新JButton(“Reset”);
静态JComboBox Intervalpick=newjcombobox();
静态JFrame=新JFrame(“迷宫跑步者”);
静态int arow=0,acolumn=0,iccurrentTime=5000;
静态布尔博弈=假;
静态定时器t;
静态缓冲图像双墙、双地板、双屋、双鞋;
公共静态void main(字符串[]args){
mazerunner mr=新mazerunner();
filereader();//读取文件
imagebuffer();//缓冲图像
jpanelinit先生();//初始化gui
frameinit();//初始化帧
timerinit先生();//初始化计时器
}
私有静态void imagebuffer(){
试一试{
biWall=ImageIO.read(新文件(“cobblewall.jpg”);
}
捕获(IOE){}
试一试{
biFloor=ImageIO.read(新文件(“woodenfloor.jpg”);
}
捕获(IOE){}
试一试{
biCheese=ImageIO.read(新文件(“cost_cheese.jpg”);
}
捕获(IOE){}
试一试{
biMouse=ImageIO.read(新文件(“lara_mouse.jpg”);
}
捕获(IOE){}
}
私有void timerinit(){
t=新计时器(icurrenttime,this);
}
私有无效JPanelinet(){
JPanel Background=newjpanel(newborderlayout());//初始化所有JPanel
JPanel菜单=新建JPanel(新建边框布局());
JPanel迷宫=新JPanel(新网格布局(arow,acolumn));
Background.setPreferredSize(新维度(850850));//设置面板的大小
Menu.setPreferredSize(新尺寸(850,100));
迷宫。设置首选尺寸(新尺寸(850750));
frame.add(Background);//将背景添加到帧中
comboboxinit();
Background.add(Menu,BorderLayout.NORTH);//将其他面板添加到背景中
背景。添加(迷宫,边界布局。南);
Menu.add(Startpause,BorderLayout.WEST);//将菜单的组件添加到菜单面板中
菜单。添加(重置,边界布局。东);
添加(间隔拾取、边界布局、中心);
Intervalpick.setVisible(true);//将组件设置为可见并添加actionlistener
Intervalpick.addActionListener(此);
Startpause.setVisible(true);
Startpause.addActionListener(此);
Reset.setVisible(真);
Reset.addActionListener(这个);
Maze.setVisible(true);
}
私有静态void comboxinit(){
for(int a=5;apaintComponent
将不会被调用,原因有三个
组件未连接到有效的本机对等方(即,它未直接或间接连接到屏幕上可见的窗口)
或者它的大小不大于0x0
或者它不可见
浏览一下您的代码,我在任何地方都找不到mazerunner
的实例实际添加到框架中
您可能希望进行通读,这将使人们更容易阅读您的代码,您也更容易阅读其他人paintComponent
由于三个基本原因不会被调用。该组件未连接到有效的本机对等方(即,它未直接或间接连接到屏幕上可见的窗口)或者它的大小不大于0x0,或者它不可见…1)为了更快地获得更好的帮助,发布一个(最小完整的可验证示例)。2)获取图像的一种方法例如,热链接到中看到的图像。