1    package npw;
2    
3    import painter.SPainter;
4    import shapes.SCircle;
5    import javax.swing.*;
6    import java.awt.*;
7    import java.util.Random;
8    import java.util.Scanner;
9    
10   public class HirstDots {
11   
12       private void paintTheImage(){
13           // Get the input information
14           int radius = getNumber("circle radius");
15           int circleradius2 = getNumber("circle radius 2");
16   
17           // Establish the painter
18           SPainter painter = new SPainter("Circle of Circles", radius*2+50, radius*2+50);
19           painter.setBrushWidth(3);
20           SCircle circle = new SCircle(radius);
21           SCircle circle2 = new SCircle(circleradius2);
22   
23           // Paint the squares
24           paintCircleOfCircles(painter, circle, circle2);
25       }
26   
27       private void paintCircleOfCircles(SPainter painter, SCircle circle, SCircle circle2){
28           // Position the painter to begin drawing the rows
29           painter.mfd(circle.radius());
30           painter.tr();
31           // Paint the circle of squares
32           double moved = 0;
33           while (moved < circle.diameter()) {
34               double chord = chordLength(circle.radius() - moved, circle);
35               int circles = circlesOnLineCount(chord, circle2.radius());
36               paintRow(painter, circle2, circles);
37               nextRow(painter, circle2.radius());
38               moved = moved + circle2.radius();
39   
40   
41   
42           }
43           // Make the method invariant with respect to painter position
44           painter.tl();
45           painter.mfd(circle.radius());
46       }
47   
48       // Move to the next row
49       private void nextRow(SPainter painter, double rowHeight){
50           painter.tr();
51           painter.mfd(rowHeight);
52           painter.tl();
53       }
54   
55       // Assumes the painter is at the center of the row to paint, facing right.
56       private void paintRow(SPainter painter, SCircle circle, int circlesToPaint){
57           // Move backward 1/2 of the length we're painting to get ready to paint the row.
58           double centerOffset = ( (circlesToPaint * circle.radius()) / 2) - circle.radius()/2;
59           painter.mbk(centerOffset);
60   
61           // Paint the row of squares.
62           int painted = 0;
63           while (painted < circlesToPaint){
64               paintOneCircle(painter, circle);
65               painter.mfd(circle.radius());
66               painted = painted + 1;
67           }
68   
69           // Make the method invariant with respect to painter position.
70           painter.mbk(centerOffset + circle.radius());
71   
72   
73       }
74   
75       private static int getNumber(String prompt) {
76           String nss = JOptionPane.showInputDialog(null,prompt+"?");
77           Scanner scanner = new Scanner(nss);
78           return scanner.nextInt();
79       }
80   
81       private static Color randomColor() {
82           Random rgen = new Random();
83           int r = rgen.nextInt(256);
84           int g = rgen.nextInt(256);
85           int b = rgen.nextInt(256);
86           return new Color(r,g,b);
87       }
88   
89   
90   
91       private void paintOneCircle(SPainter painter, SCircle circle){
92           circle.s2();
93           circle.s2();
94           painter.paint(circle);
95           painter.setColor(randomColor());
96           circle.x2();
97           circle.x2();
98   
99   
100      }
101  
102  
103      private static int circlesOnLineCount(double lineLength, double radius){
104          int circles = ( (int)Math.ceil( ( lineLength - radius ) / radius ) + 1);
105          return circles;
106      }
107  
108      private double chordLength(double yOffset, SCircle circle){
109          double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
110          double chordLength = xLength * 2;
111          return chordLength;
112      }
113  
114  
115  
116  
117      public HirstDots() {
118          paintTheImage();
119      }
120  
121      public static void main(String[] args) {
122          SwingUtilities.invokeLater(new Runnable() {
123              public void run() {
124                  new HirstDots();
125              }
126          });
127      }
128  }