1    /* 
2     * Program to paint an image subject to the following constraints: 
3     * 1. It uses at least 1 while statement in a non-trivial way 
4     * 2. It uses at least 1 if statement in a non-trivial way 
5     * 3. It features solely rectangles, all generated from just 1 rectangle 
6     * 4. The program takes no input from the user of the program 
7     * 5. It creates a different image each time the program is executed, different with respect 
8     *      to number or size or color or whatever of the featured object 
9     * 6. It is kinda interesting to look at 
10    */
11   
12   package npw;
13   
14   import painter.SPainter;
15   import shapes.SRectangle;
16   import javax.swing.*;
17   import java.awt.*;
18   
19   public class Invention2 {
20   
21       private void paintTheImage() {
22           SPainter painter = new SPainter("Nondeterministic Invention Stars", 600, 600);
23           int nrOfStars = 500; //500 stars to paint
24           int skyHeight = 800; //800 to make sure painter is covered
25           int skyWidth = 800; //800 to make sure painter is covered
26           SRectangle sky = new SRectangle(skyHeight, skyWidth);
27           paintSky(painter, sky); //paint black sky
28           paintStars(painter, sky, nrOfStars); //paint white stars
29       }
30   
31       private void paintSky(SPainter painter, SRectangle sky) {
32           painter.setColor(Color.BLACK);
33           painter.paint(sky);
34       }
35   
36       private void paintStars(SPainter painter, SRectangle star, int nrOfStars) {
37           painter.setColor(Color.WHITE);
38           star.shrink(794, 794); //shrink it to itsy bitsy
39           int i = 1;
40           while ( i <= nrOfStars ) { //counter
41               if (i % 2 == 0) { //if even, make stars that are small and yellow
42                   painter.setColor(Color.YELLOW);
43                   painter.faceNorth(); //set painter heading to 0 degrees
44                   painter.move(); //random position
45                   painter.paint(star);
46                   star.expand(5, 5);
47                   painter.paint(star);
48                   painter.tl(45);
49                   painter.paint(star);
50                   star.shrink(5, 5); //make invariant
51                   painter.tr(45); //make invariant
52                   painter.setColor(Color.WHITE); //make invariant
53               } else if (i % 5 == 0){ //For the stars numbers that are divisible by 5, make a random colored star
54                   Color color = randomColor(); //assign random RGB color
55                   painter.setColor(color);
56                   painter.faceNorth(); //set painter heading to 0 degrees
57                   painter.move(); //random position
58                   painter.paint(star);
59                   painter.tl(45);
60                   painter.paint(star); //second rectangle to create star look
61                   painter.tr(45); //make invariant
62               } else { //if not even or divisible by 5, make stars that are larger and white
63                   painter.faceNorth();
64                   painter.move(); //random position
65                   star.expand(10, 10);
66                   painter.paint(star);
67                   painter.tl(45); //rotate 45 degrees
68                   painter.paint(star);
69                   painter.tr(45); //make invariant
70                   star.shrink(10,10); //make invariant
71               }
72               i++;
73           }
74       }
75   
76       private static Color randomColor() {
77           int rv = (int)(Math.random()*256);
78           int gv = (int)(Math.random()*256);
79           int bv = (int)(Math.random()*256);
80           return new Color(rv, gv, bv);
81       }
82   
83       // REQUIRED INFRASTRUCTURE
84       public Invention2() {
85           paintTheImage();
86       }
87   
88       public static void main(String[] args) {
89           SwingUtilities.invokeLater(new Runnable() {
90               public void run() {
91                   new npw.Invention2();
92               }
93           });
94       }
95   }