import javax.swing.*;
import java.awt.*;     // Abstract Windowing Toolkit:  graphics stuff

public class Ovals extends JApplet {

  public void paint (Graphics g) {
    drawOvals(g, 10,10); // Draw a 10x10 grid of ovals
  }
     
  // Draw a grid of ovals with the given number of rows and columns. 
  // The size of the ovals changes with x and y coordinates: 
  // * Across the x-axis, the width grows from cellWidth/cols to cellWidth
  // * Down the y-axiss, the width grows from cellHeight/rows to cellHeight
  // The color of the ovals changes with x and y coordinate:
  // * Across the x-axis, the blue component grows from 255/cols to 255
  // * Down the y-axis, the red component grows from 255/rows to 255
  // * The green component is always 0
  public void drawOvals (Graphics g, int rows, int cols) {
    // Find the width and height of this applet
    int appletWidth = getWidth();
    int appletHeight = getHeight();
    int cellWidth = (appletWidth - (cols + 1))/cols; // subtract off grid lines
    int cellHeight = (appletHeight - (rows + 1))/rows; // subtract off grid lines
          
    // Draw grid lines
    g.setColor(Color.black);
    for (int x = 0; x <= appletWidth-1 ; x = x + cellWidth + 1) {
      g.drawLine(x, 0, x, appletWidth-1); // Vertical grid lines
    }
    for (int y = 0; y <= appletHeight-1; y = y + cellHeight + 1) {
      g.drawLine(0, y, appletHeight-1, y); // Horizontal grid lines
    }
    for (int row = 1; row <= rows; row++) {
      for (int col = 1; col <= cols; col++) {
        g.setColor(new Color(row * 255/rows, 0, col * 255/cols));
        g.fillOval((col - 1)*(cellWidth + 1) + 1, 
                   (row - 1)*(cellHeight + 1) + 1,
                   (col * cellWidth)/cols,
                   (row * cellHeight)/rows);
      }
    }
  }
}