これは私のコードです。ウィンドウを復元したり、サイズにドラッグしたりするなど、ユーザーがウィンドウのサイズを変更した場合でも、ボールが跳ね返るボックスのサイズをウィンドウサイズのサイズに設定したいと思います。どうもありがとう。
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
/**
* One ball bouncing inside a rectangular box.
* All codes in one file. Poor design!
*/
// Extends JPanel, so as to override the paintComponent() for custom rendering codes.
public class BouncingBallSimple extends JPanel {
// Container box's width and height
private final int BOX_WIDTH = 700;
private final int BOX_HEIGHT = 700;
// Ball's properties
private float ballRadius = 15; // Ball's radius
private float ballX = ballRadius + 50; // Ball's center (x, y)
private float ballY = ballRadius + 20;
private float ballSpeedX = 60; // Ball's speed for x and y
private float ballSpeedY = 60;
private static final int UPDATE_RATE = 30; // Number of refresh per second
/** Constructor to create the UI components and init game objects. */
public BouncingBallSimple() {
this.setPreferredSize(new Dimension(BOX_WIDTH, BOX_HEIGHT));
// Start the ball bouncing (in its own thread)
Thread gameThread;
gameThread = new Thread() {
@Override
public void run() {
while (true) { // Execute one update step
// Calculate the ball's new position
ballX += ballSpeedX;
ballY += ballSpeedY;
// Check if the ball moves over the bounds
// If so, adjust the position and speed.
if (ballX - ballRadius < 0) {
ballSpeedX = -ballSpeedX; // Reflect along normal
ballX = ballRadius; // Re-position the ball at the edge
} else if (ballX + ballRadius > BOX_WIDTH) {
ballSpeedX = -ballSpeedX;
ballX = BOX_WIDTH - ballRadius;
}
// May cross both x and y bounds
if (ballY - ballRadius < 0) {
ballSpeedY = -ballSpeedY;
ballY = ballRadius;
} else if (ballY + ballRadius > BOX_HEIGHT) {
ballSpeedY = -ballSpeedY;
ballY = BOX_HEIGHT - ballRadius;
}
// Refresh the display
repaint(); // Callback paintComponent()
// Delay for timing control and give other threads a chance
try {
Thread.sleep(1000 / UPDATE_RATE); // milliseconds
} catch (InterruptedException ex) { }
}
}
};
gameThread.start(); // Callback run()
}
/** Custom rendering codes for drawing the JPanel */
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g); // Paint background
// Draw the box
g.setColor(Color.CYAN);
g.fillRect(0, 0, getWidth(), getHeight());
// Draw the ball
g.setColor(Color.BLUE);
g.fillOval((int) (ballX - ballRadius), (int) (ballY - ballRadius),
(int)(2 * ballRadius), (int)(2 * ballRadius));
Graphics2D comp2D = (Graphics2D) g;
comp2D.drawRect(0, 645, 1365, 100);
comp2D.setColor(Color.GREEN);
comp2D.fillRect(0, 645, 1365, 100);
Graphics2D stand = (Graphics2D) g;
stand.setColor(Color.BLACK);
stand.fillRect(80, 575, 30, 70);
Graphics2D sling = (Graphics2D) g;
sling.drawArc(15, 570, 90, 50, 50, 250);
}
/** main program (entry point) */
public static void main(String[] args) {
// Run GUI in the Event Dispatcher Thread (EDT) instead of main thread.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
// Set up main window (using Swing's Jframe)
JFrame frame = new JFrame("Angry Birds for Annie May Tion");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setContentPane(new BouncingBallSimple());
frame.pack();
frame.setVisible(true);
}
});
}
}