Java 遊戲程式設計：動畫 ( Java Game Programming: Animation )

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在用程式語言製作動畫之前，要了解電腦如何產生動畫，可參考此連結：動畫簡介。
Before creating a computer animation with a programming language, the concept:"how a computer produces animations" have to be understood.

那麼要如何在Java裡要產生動畫？利用Timer就可以了。

The Java programming has a Timer class that can generate animations.

底下了範例是用Swing Timer來實現將螢幕上的東西從左移動到右。
The following example use Swing Timer to move a square from the left to the right of the screen.

程式碼如下：
The code is:

	package holan.tw;
	import java.awt.Color;
	import java.awt.Graphics;
	import java.awt.event.ActionEvent;
	import java.awt.event.ActionListener;
	import javax.swing.JFrame;
	import javax.swing.Timer;
	public class GameAnimation extends JFrame implements ActionListener {
	final int SCREEN_WIDTH = 400;
	final int SCREEN_HEIGHT = 400;
	final int RECT_WIDTH = 20;
	final int RECT_HEIGHT = 20;
	final int DELAY_MS = 20;
	int dx = 1;
	int xPos = 0;
	int yPos = SCREEN_HEIGHT / 2;
	Timer timer;
	public GameAnimation() {
	setTitle("遊戲動畫");
	setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	setLocationRelativeTo(null);
	timer = new Timer(DELAY_MS, this);
	timer.setInitialDelay(190);
	timer.start();
	}
	public void update(Graphics g) {
	this.paint(g);
	}
	public void paint(Graphics g) {
	super.paint(g);
	g.setColor(Color.GREEN);
	g.fillRect(xPos, yPos, RECT_WIDTH, RECT_HEIGHT);
	}
	public static void main(String[] args) {
	new GameAnimation().show();
	}
	@Override
	public void actionPerformed(ActionEvent arg0) {
	this.repaint();
	xPos += 1;
	if( xPos >= SCREEN_WIDTH ) xPos = 0;
	}
	}

view raw GameAnimation.java hosted with ❤ by GitHub