1    /* 
2     * This programs creates randomly sized and colored concentric rectangles. 
3     */
4    
5    package npw;
6    
7    import painter.SPainter;
8    import shapes.SRectangle;
9    import javax.swing.*;
10   import java.awt.*;
11   import java.util.Random;
12   
13   public class Invention2 {
14   
15       private void paintTheImage(){
16           //Variables
17           int canvaswidth = 800;
18           int recSide = ((canvaswidth- 100)/2);
19           int numOfRec = randomNum();
20           int sizeFx = recSide / numOfRec;
21           int sizeFx2 = canvaswidth / numOfRec;
22           int i = 0;
23           SPainter painter = new SPainter("Invention2", 800, 400 );
24           SRectangle rectangle = new SRectangle(recSide, canvaswidth );
25   
26           while (i < numOfRec) {
27               if (i % 2 > 0) {
28                   painter.setColor(randomColor());
29                   painter.paint(rectangle);
30                   rectangle.shrink(sizeFx, sizeFx2);
31               } else {
32                   painter.setColor(randomColor());
33                   painter.paint(rectangle);
34                   rectangle.shrink(sizeFx, sizeFx2);
35               }
36               i++;
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 int randomNum() {
53           Random randNum = new Random();
54           int n = randNum.nextInt(100);
55           n += 1;
56           return n;
57       }
58   
59       public Invention2() {
60           paintTheImage();
61       }
62   
63       public static void main(String[] args) {
64           SwingUtilities.invokeLater(new Runnable() {
65               public void run() {
66                   new Invention2();
67               }
68           });
69       }
70   }