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儘管有類似的問題，但我認爲我的代碼設置稍有不同。我的主要方法中有一個JFrame。不過，我的構造函數中只有JPanel。我試圖讓我的一些變量是靜態的，這樣我就可以在主要方法中訪問它們，並且說，例如，如果此圖形的x座標加上其寬度大於frame.getWidth（）..但是贏得'由於某種原因工作。我不想轟炸任何有代碼的人，所以我只會嘗試提供主要信息，如果您需要更多信息，我會更新它。不讓圖形超出JFrame邊界
package finalProj;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.geom.Ellipse2D;
public class nonaMaingamePractice extends JPanel implements ActionListener, KeyListener {
/**
*
*/
private static final long serialVersionUID = 1L;
private static Ellipse2D ellipse;
static Toolkit tools = Toolkit.getDefaultToolkit();
static int screenWidth = (int)(Math.round(tools.getScreenSize().getWidth()));
static int screenHeight = (int)(Math.round(tools.getScreenSize().getHeight()));
private static Rectangle paddleRect;
JLabel text = new JLabel("cool");
Timer timeMove = new Timer(1, this);
Timer timeBall = new Timer(10, new timeBall());
private static double x = screenWidth/2, y = (screenHeight*0.8), xx = 0, yy = 0, score = 0, Ox = screenWidth/2, Oy = screenHeight/2, Oyy = 0, width = 100, height = 30;
public nonaMaingamePractice(){
setLayout(new BorderLayout());
timeBall.start();
timeMove.start();
addKeyListener(this);
setFocusable(true);
JPanel panelNorth = makePanel();
panelNorth.setBackground(Color.CYAN);
add(panelNorth, BorderLayout.NORTH);
JLabel scoreLabel = new JLabel("Score: " + score);
panelNorth.add(scoreLabel);
}
public void paintComponent(Graphics g){
super.paintComponent(g);
g.setColor(Color.BLUE);
paddleRect = new Rectangle((int)x, (int)y, (int)width, (int)height);
ellipse = new Ellipse2D.Double(Ox, Oy+Oyy, 50, 50);
Graphics2D graphics = (Graphics2D)g;
graphics.fill(paddleRect);
graphics.fill(ellipse);
}
@Override
public void actionPerformed(ActionEvent e) {
x = x + xx;
y = y + yy;
if(x<0){
x=0;
xx=0;
}
repaint();
}
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyPressed(KeyEvent e) {
int c = e.getKeyCode();
if(c==KeyEvent.VK_RIGHT){
xx=1;
}else if(c==KeyEvent.VK_LEFT){
xx=-1;
}
}
@Override
public void keyReleased(KeyEvent e) {
xx=0;
}
protected JPanel makePanel() {
@SuppressWarnings("serial")
JPanel pane = new JPanel() {
@Override
public Dimension getPreferredSize() {
return new Dimension(100, 30);
}
};
pane.setBackground(Color.CYAN);
return pane;
}
protected class timeBall implements ActionListener{
Timer timeWhateva = new Timer(100, this);
@Override
public void actionPerformed(ActionEvent e) {
try{
System.out.println(paddleRect.getX());
if(ellipse.intersects(paddleRect)){
timeWhateva.start();
Oy+=-1;
System.out.println(ellipse.getX() + " " + ellipse.getY());
}else if(!ellipse.intersects(paddleRect)){
Oyy+=1;
}
}catch(RuntimeException NullPointerException){
System.out.println(NullPointerException.getMessage());
}
repaint();
}
}
public static void main(String[] args){
nonaMaingamePractice main = new nonaMaingamePractice();
JFrame frame = new JFrame();
frame.add(main);
frame.setVisible(true);
frame.setTitle("Project 4 game");
frame.setSize(screenWidth, screenHeight);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
什麼是你的問題？您是否問如何使用不大於屏幕的自定義繪畫創建JPanel？ – VGR
對不起@VGR，問題是：我怎樣才能讓圖形不會離開JFrame的外部？ – Tyler
請記住，框架的裝飾被繪製在可見框架區域的邊界內，因此，從技術上講，試圖將框架限制在框架內需要考慮這些因素。話雖如此，我真的不知道你在問什麼。什麼圖形？我能想到的最簡單的事情就是簡單地使用另一個'JPanel'，將其添加到BorderLayout的中心位置，並使用它來顯示任何自定義圖形 – MadProgrammer