// file:    MyFrame2.java
// author:  Robert Keller
// purpose: Flicker removal using off-screen buffer


import java.awt.*;

public class MyFrame2 extends Frame               // Customize Frame class
{
Image buffer;                                     // off-screen buffer

// test Program

public static void main(String[] arg)
  {
  new MyFrame2("My Frame", 50,  50);
  }


// construct frame with title and position

MyFrame2(String title, int x, int y)
  {
  setTitle(title);

  setBackground(Color.white);                     // set the background color

  reshape(x, y, 500, 400);                        // set the location and size

  setVisible(true);                               // show the frame 

  toFront();
  }


// over-ride update

public void update(Graphics g)
  {
  paint(g);
  }


// draw items in buffer Graphics

void drawStuff()
  {
  Graphics g = buffer.getGraphics();

  g.setColor(Color.black);                        // set the color for drawing
  g.drawRect(50, 50, 400, 300);                   // draw a rectangle
  g.fillOval(100, 100, 300, 200);                 // fill an oval

  g.setFont(new Font("Times", Font.BOLD, 20));  
  g.setColor(Color.yellow);
  g.drawString("Harvey Mudd College", 120, 210);  // draw a string
  }


// paint(Graphics) will be called by the system to paint the Frame when 
// necessary, e.g. when setVisible(true) is called.  This call is done
// implicitly; we do not see it in the source.
// The Graphics of the frame will then be passed as an argument.

public void paint(Graphics g)
  {
  if( buffer == null )
    buffer = createImage(getWidth(), getHeight());

  drawStuff();

  g.drawImage(buffer, 0, 0, null);
  }
}