Java 遊戲程式設計：鍵盤控制 (Java Game Programming: Control a Sprite with the Keyboard )

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底下為使用鍵盤控制兩個形狀：正方形和圓形的範例。

鍵盤使用說明：

1. 向上鍵為控制正方形往上移。
2. 向下鍵為控制正方形往下移。
3. 向左鍵為控制正方形往左移。
4. 向右鍵為控制正方形往右移。
5. W鍵為控制圓形往上移。
6. X鍵為控制圓形往下移。
7. A鍵為控制圓形往左移。
8. D鍵為控制圓形往右移。

	package holan.tw;
	import java.awt.Color;
	import java.awt.Graphics;
	import java.awt.event.ActionEvent;
	import java.awt.event.ActionListener;
	import java.awt.event.KeyEvent;
	import java.awt.event.KeyListener;
	import javax.swing.JFrame;
	import javax.swing.Timer;
	public class GameInput extends JFrame implements KeyListener {
	final int SCREEN_WIDTH = 400;
	final int SCREEN_HEIGHT = 400;
	final int RECT_WIDTH = 20;
	final int RECT_HEIGHT = 20;
	final int SPRITES_NUM = 2;
	int xSpeed = 20;
	int ySpeed = 20;
	int xPos = SCREEN_WIDTH / 2;
	int yPos = SCREEN_HEIGHT / 2;
	int[] spritePosX = new int[SPRITES_NUM];
	int[] spritePosY = new int[SPRITES_NUM];
	public GameInput() {
	setTitle("遊戲基礎-鍵盤控制");
	setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	setLocationRelativeTo(null);
	addKeyListener(this);
	for(int i = 0; i < SPRITES_NUM; i++) {
	spritePosX[i] = xPos;
	spritePosY[i] = yPos;
	}
	}
	public void update(Graphics g) {
	this.paint(g);
	}
	public void paint(Graphics g) {
	super.paint(g);
	g.setColor(Color.GREEN);
	g.fillRect(spritePosX[0], spritePosY[0], RECT_WIDTH, RECT_HEIGHT);
	g.setColor(Color.RED);
	g.fillOval(spritePosX[1], spritePosY[1], RECT_WIDTH, RECT_HEIGHT);
	}
	public static void main(String[] args) {
	new GameInput().show();
	}
	@Override
	public void keyPressed(KeyEvent e) {
	int key = e.getKeyCode();
	// Move the Square
	if( key == KeyEvent.VK_UP )
	spritePosY[0] -= ySpeed;
	if( key == KeyEvent.VK_DOWN )
	spritePosY[0] += ySpeed;
	if( key == KeyEvent.VK_LEFT )
	spritePosX[0] -= xSpeed;
	if( key == KeyEvent.VK_RIGHT )
	spritePosX[0] += xSpeed;
	// Move the Circle
	if( key == KeyEvent.VK_W )
	spritePosY[1] -= ySpeed;
	if( key == KeyEvent.VK_X )
	spritePosY[1] += ySpeed;
	if( key == KeyEvent.VK_A )
	spritePosX[1] -= xSpeed;
	if( key == KeyEvent.VK_D)
	spritePosX[1] += xSpeed;
	checkSpritePosRange();
	repaint();
	}
	private void checkSpritePosRange() {
	for(int i = 0; i < SPRITES_NUM; i++) {
	if( spritePosX[i] < 0) spritePosX[i] = SCREEN_WIDTH;
	if( spritePosY[i] < 0) spritePosY[i] = SCREEN_HEIGHT;
	if( spritePosX[i] > SCREEN_WIDTH) spritePosX[i] = 0;
	if( spritePosY[i] > SCREEN_HEIGHT) spritePosY[i] = 0;
	}
	}
	@Override
	public void keyReleased(KeyEvent e) {
	}
	@Override
	public void keyTyped(KeyEvent e) {
	}
	}

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