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