Canvas类 低级界面开发的一个初步程序

package DrawSin;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Graphics;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class MIDlet1 extends MIDlet
{
	private Display dis;
	private Draw d = new Draw();
	
	protected void startApp() throws MIDletStateChangeException
	{
		d.setTitle("DrawSin");
		dis = Display.getDisplay(this);
		dis.setCurrent(d);		

	}
	
	class Draw extends Canvas
	{

		protected void paint(Graphics g)
		{
			g.setColor(255, 0, 0);
			g.drawLine(0, 150, 300, 150);//x轴
			g.drawLine(100, 0, 100, 300);//y轴
			int y=0;
			for(int x=0;x<=3600;x++)
			{
				y= (int)(150+10*Math.sin(x*Math.PI/180));
				g.drawLine((int)(x/10), y, (int)(x/10), y);
			}
		}
		
	}

	protected void destroyApp(boolean unconditional)
			throws MIDletStateChangeException
	{
	}

	protected void pauseApp()
	{
	}


}