-1
Spriteオブジェクトをキャンバスの特定の座標上で移動させたくありません。これどうやってするの ？今まで私が行ってきたこと：私のスプライトオブジェクトがキャンバスの特定の座標上を移動するのを防ぐ方法
- パッケージproject1;コード内
import java.awt.*;
// Using AWT's Graphics and Color
import java.awt.event.*;
// Using AWT's event classes and listener
interfaces import javax.swing.*;
// Using Swing's components and containers
/**
* Custom Graphics Example: Using key/button to move a object left or right.
* The moving object (sprite) is defined in its own class, with its own
* operations and can paint itself. *
*/ class Sprite {
// Variables (package access)
public int x;
public int y;
int width, height;
// Use an rectangle for illustration
Color color = Color.RED; // Color of the object
// Constructor
public Sprite(int x, int y, int width, int height, Color color) {
this.x = x;
this.y = y;
this.width = width;
this.height = height;
this.color = color;
}
// Paint itself given the Graphics context
public void paint(Graphics g) {
g.setColor(color);
g.fillRect(x, y, width, height); // Fill a rectangle
// g.drawLine(20, 0, 20, 240);
System.out.println("paint X: "+x+" Y: "+y);
//System.out.println("paint 2nd X: "+x+" Y: "+y); } }
public class Project1 extends JFrame {
// Define constants for the various dimensions
public static final int CANVAS_WIDTH = 400;
public static final int CANVAS_HEIGHT = 240;
public static final Color CANVAS_BG_COLOR = Color.CYAN;
private DrawCanvas canvas;
// the custom drawing canvas (an inner class extends JPanel)
private Sprite sprite; // the moving object
// Constructor to set up the GUI components and event handlers
public Project1() {
// Construct a sprite given x, y, width, height, color
int x = 0,y = 0;
sprite = new Sprite(CANVAS_WIDTH/2 - 30, CANVAS_HEIGHT/2 - 30,
10, 10, Color.RED);
// Set up a panel for the buttons
JPanel btnPanel = new JPanel(new FlowLayout());
JButton btnLeft = new JButton("Move Left ");
btnPanel.add(btnLeft);
btnLeft.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
moveLeft();
requestFocus(); // change the focus to JFrame to receive KeyEvent
}
});
//JPanel btnPanel1 = new JPanel(new FlowLayout());
JButton btnDown = new JButton("Move down ");
btnPanel.add(btnDown);
btnDown.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
moveDown();
requestFocus(); // change the focus to JFrame to receive KeyEvent
}
});
JButton btnRight = new JButton("Move Right");
btnPanel.add(btnRight);
btnRight.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
moveRight();
requestFocus(); // change the focus to JFrame to receive KeyEvent
}
});
JButton btnUp = new JButton("Move Up");
btnPanel.add(btnUp);
btnUp.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
moveUp();
requestFocus(); // change the focus to JFrame to receive KeyEvent
}
});
// Set up the custom drawing canvas (JPanel)
canvas = new DrawCanvas();
canvas.setPreferredSize(new Dimension(CANVAS_WIDTH, CANVAS_HEIGHT));
// Add both panels to this JFrame
Container cp = getContentPane();
cp.setLayout(new BorderLayout());
cp.add(canvas, BorderLayout.CENTER);
cp.add(btnPanel, BorderLayout.SOUTH);
// "super" JFrame fires KeyEvent
addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent evt) {
switch(evt.getKeyCode()) {
case KeyEvent.VK_LEFT: moveLeft(); break;
case KeyEvent.VK_RIGHT: moveRight(); break;
case KeyEvent.VK_DOWN: moveDown(); break;
case KeyEvent.VK_UP: moveUp(); break;
}
}
});
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("Move a Sprite");
pack(); // pack all the components in the JFrame
setVisible(true); // show it
requestFocus(); // "super" JFrame requests focus to receive KeyEvent }
// Helper method to move the sprite left private void moveLeft() {
// Save the current dimensions for repaint to erase the sprite
int savedX = sprite.x;
// update sprite
sprite.x -= 10;
// Repaint only the affected areas, not the entire JFrame, for efficiency
canvas.repaint(savedX, sprite.y, sprite.width, sprite.height); // Clear old area to background
canvas.repaint(sprite.x, sprite.y, sprite.width, sprite.height); // Paint new location }
// Helper method to move the sprite right private void moveRight() {
// Save the current dimensions for repaint to erase the sprite
int savedX = sprite.x;
// update sprite
sprite.x += 10;
// Repaint only the affected areas, not the entire JFrame, for efficiency
canvas.repaint(savedX, sprite.y, sprite.width, sprite.height); // Clear old area to background
canvas.repaint(sprite.x, sprite.y, sprite.width, sprite.height); // Paint at new location }
private void moveDown() {
//Save the current dimensions for repaint to erase the sprite
int saved = sprite.y;
// update sprite
sprite.y += 10;
// Repaint only the affected areas, not the entire JFrame, for efficiency
canvas.repaint(sprite.x, saved, sprite.width, sprite.height); // Clear old area to background
canvas.repaint(sprite.x, sprite.y, sprite.width, sprite.height); // Paint new location } private void moveUp() {
//Save the current dimensions for repaint to erase the sprite
int savedY = sprite.y;
// update sprite
sprite.y -= 10;
// Repaint only the affected areas, not the entire JFrame, for efficiency
canvas.repaint(sprite.y, savedY, sprite.width, sprite.height); // Clear old area to background
canvas.repaint(sprite.x, sprite.y, sprite.width, sprite.height); // Paint new location }
// Define inner class DrawCanvas, which is a JPanel used for custom drawing class DrawCanvas extends JPanel {
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
setBackground(CANVAS_BG_COLOR);
sprite.paint(g); // the sprite paints itself
} }
// The entry main() method public static void main(String[] args) {
// Run GUI construction on the Event-Dispatching Thread for thread safety
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Project1(); // Let the constructor do the job
}
});
}
}
私に例を挙げてもらえますか？ –