1    /* 
2     * Program 9 colored dots, Npw. 
3     */
4    
5    package npw;
6    
7    import painter.SPainter;
8    import shapes.SCircle;
9    import javax.swing.*;
10   import java.awt.*;
11   
12   public class Dots {
13   
14       // THE SOLUTION TO THE 9 DOT PROBLEM
15       private void paintTheImage() {
16           SPainter corn = new SPainter("Nine Dots",700,550);
17   
18           SCircle dot = new SCircle(70);
19           paintpinkCircles(corn,dot);
20           paintmagentaCircles(corn, dot);
21           paintBlueCircle(corn, dot);
22           paintRedCircle(corn, dot);
23       }
24       private void paintpinkCircles(SPainter corn, SCircle dot) {
25           //pink dot on the left
26           corn.mlt(250);
27           corn.setColor(Color.PINK);
28           corn.paint(dot);
29           //invariant
30           corn.moveToCenter();
31           //same pink dot but on the right
32           corn.mrt(250);
33           corn.setColor(Color.PINK);
34           corn.paint(dot);
35           //invariant
36           corn.moveToCenter();
37       }
38       private void paintmagentaCircles(SPainter corn, SCircle dot) {
39           //bottom-left magenta dot
40           corn.mbk(90);
41           corn.mlt(130);
42           corn.setColor(Color.magenta);
43           corn.paint(dot);
44           //invariant
45           corn.moveToCenter();
46           //bottom-right magenta dot
47           corn.mbk(90);
48           corn.mrt(130);
49           corn.setColor(Color.magenta);
50           corn.paint(dot);
51           //invariant
52           corn.moveToCenter();
53           //lower-mid magenta dot
54           corn.mbk(175);
55           corn.setColor(Color.magenta);
56           corn.paint(dot);
57           //invariant
58           corn.moveToCenter();
59       }
60       private void paintBlueCircle(SPainter corn, SCircle dot) {
61           //top-left blue dot
62           corn.mfd(90);
63           corn.mlt(130);
64           corn.setColor(Color.blue);
65           corn.paint(dot);
66           //invariant
67           corn.moveToCenter();
68           //top-right blue dot
69           corn.mfd(90);
70           corn.mrt(130);
71           corn.setColor(Color.blue);
72           corn.paint(dot);
73           //invariant
74           corn.moveToCenter();
75           //mid-top blue dot
76           corn.mfd(175);
77           corn.setColor(Color.blue);
78           corn.paint(dot);
79           //invariant
80           corn.moveToCenter();
81       }
82       private void paintRedCircle(SPainter corn, SCircle dot) {
83           corn.setColor(Color.RED);
84           corn.paint(dot);
85           //invariant
86           corn.moveToCenter();
87       }
88       //REQUIRED INFRASTRUCTURE
89       public Dots() {
90           paintTheImage();
91       }
92   
93       public static void main(String[] args) {
94           SwingUtilities.invokeLater(new Runnable() {
95               public void run() {
96                   new Dots();
97               }
98           });
99       }
100  }
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