1    /* This program asks for a number of concentric squares. Two randomly chosen colors will be used for the image. 
2     */
3    
4    
5    package npw;
6    import java.awt.Color;
7    import java.util.Scanner;
8    import javax.swing.*;
9    import java.util.Random;
10   import painter.SPainter;
11   import shapes.SCircle;
12   import shapes.SSquare;
13   
14   public class Stella {
15       private void paintTheImage() {
16           int nrOfSquares = getNrOfSquares("how many concentric squares");
17           SPainter painter = new SPainter("Stella", 800, 800);
18           int squareSide = 700;
19           paintTheSquares(squareSide,nrOfSquares,painter);
20   
21       }
22   
23       private void paintTheSquares(int squareSide, int nrOfSquares, SPainter painter) {
24           int i = squareSide;
25           Color color1 = randomColor();
26           Color color2 = randomColor();
27           while (i>0){
28               painter.setColor(color1);
29               SSquare square = new SSquare(i);
30               painter.paint(square);
31               i=i-(squareSide/nrOfSquares);
32               painter.setColor(color2);
33               SSquare square1 =new SSquare(i);
34               painter.paint(square1);
35               i= i-(squareSide/nrOfSquares);
36           }
37       }
38   
39   
40   
41   
42       private static Color randomColor() {
43           Random rgen = new Random();
44           int r = rgen.nextInt(256);
45           int g = rgen.nextInt(256);
46           int b = rgen.nextInt(256);
47           return new Color ( r, g , b);
48   
49   
50       }
51   
52       private static int getNrOfSquares(String prompt) {
53           String nss = JOptionPane.showInputDialog(null,prompt+"?");
54           Scanner scanner = new Scanner(nss);
55           return scanner.nextInt();
56       }
57   
58   
59       public Stella() {
60           paintTheImage();
61       }
62   
63       public static void main(String[] args) {
64           SwingUtilities.invokeLater(new Runnable() {
65               public void run() {
66                   new Stella();
67               }
68           });
69       }
70   }
71