hellocanvas.java

来自「j2me的一个手机游戏」· Java 代码 · 共 70 行

package net.frog_parrot.hello;

import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;

public class HelloCanvas extends javax.microedition.lcdui.game.GameCanvas
{
	Display myDisplay;

	boolean mySayHello = true;
	
	public HelloCanvas(Display d)
	{
		super(false);
		myDisplay = d;
	}

	void start()
	{
		myDisplay.setCurrent(this);
		repaint();
	}

	void newHello()
	{
		mySayHello = !mySayHello;
		//paint the display
		repaint();
	}

	public void paint(Graphics g)
	{
		int x = g.getClipX();
		int y = g.getClipY();
		int w = g.getClipWidth();
		int h = g.getClipHeight();
		g.setColor(0xffffff);
		g.fillRect(x,y,w,h);
		if(mySayHello)
		{
			Font font = g.getFont();
			int fontHeight = font.getHeight();
			int fontWidth = font.StringWidth("Hello World");
			g.setColor(0x00ff0000);
			g.setFont(font);
			g.drawString("Hello World!",(w-fontWidth)/2,(h-fontHeight)/2,g.TOP|g.LEFT);
		}
	}
}