Miscellany

import java.awt.*;import javax.swing.*;import java.applet.*;import java.awt.Panel.*;public class Draw2 extends Applet{	Button erase=new Button("erase");	Button color=new Button("new color");	DrawPanel canvas;	Color colour=new Color(0,0,0);		public void init()	{		canvas=new DrawPanel(getImage(getCodeBase(),"blank-canvas-640-480.gif"));		BorderLayout bord=new BorderLayout();		setLayout(bord);		add(canvas,"Center");		Panel commandPanel=new Panel();		commandPanel.add(erase);		commandPanel.add(color);		add(commandPanel,"South");	}	public boolean action(Event evt,Object obj)	{		if(evt.target==erase)		{			canvas.numPoints=-1;			canvas.repaint();		}		else if(evt.target==color)		{			String rVal=JOptionPane.showInputDialog(null,"Enter amount of red (0-255):");			String gVal=JOptionPane.showInputDialog(null,"Enter amount of green (0-255):");			String bVal=JOptionPane.showInputDialog(null,"Enter amount of blue (0-255):");						int rValue=Integer.parseInt(rVal);			int gValue=Integer.parseInt(gVal);			int bValue=Integer.parseInt(bVal);						colour=new Color(rValue,gValue,bValue);		}		return true;	}class DrawPanel extends Panel{	Image picture;	int[]drawX=new int[1000];	int[]drawY=new int[1000];	int numPoints=-1;		public void paint(Graphics screen)	{		screen.drawImage(picture,0,0,this);		screen.setColor(colour);				for(int i=0;i<=numPoints;i++)		{			screen.fillOval(drawX[i]-3,drawY[i]-3,6,6);		}	}	public void update(Graphics screen)	{		paint(screen);	}	public boolean mouseDown(Event evt,int x,int y)	{		if(numPoints<1000)		{			numPoints++;			drawX[numPoints]=x;			drawY[numPoints]=y;		}		repaint();		return true;	}	public boolean mouseDrag(Event evt,int x,int y)	{		mouseDown(evt,x,y);		return true;	}	DrawPanel(Image inputImage)	{		picture=inputImage;	}}}