1    
2            package npw;
3    
4            import painter.SPainter;
5            import shapes.SCircle;
6            import shapes.SSquare;
7    
8            import javax.swing.*;
9            import java.awt.*;
10           import java.util.Random;
11           import java.util.Scanner;
12   
13   public class HirstSquares {
14   
15       private void paintTheImage(){
16           // Get the input information
17           int radius = getNumber("circle radius");
18           int side = getNumber("square side length");
19   
20           // Establish the painter
21           SPainter painter = new SPainter("HirstSquares", radius*2+50, radius*2+50);
22           painter.setBrushWidth(3);
23           SCircle circle = new SCircle(radius);
24           SSquare square = new SSquare(side);
25   
26           // Paint the squares
27           paintHirstSquares(painter, circle, square);
28       }
29   
30       private void paintHirstSquares(SPainter painter, SCircle circle, SSquare square){
31           // Position the painter to begin drawing the rows
32           painter.mfd(circle.radius());
33           painter.tr();
34           // Paint the Hirst squares
35           double moved = 0;
36           while (moved < circle.diameter()) {
37               double chord = chordLength(circle.radius() - moved, circle);
38               int squares = squaresOnLineCount(chord, square.side());
39               paintRow(painter, square, squares);
40               nextRow(painter, square.side());
41               moved = moved + square.side();
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, SSquare square, int squaresToPaint){
57           // Move backward 1/2 of the length we're painting to get ready to paint the row.
58           double centerOffset = ( (squaresToPaint * square.side()) / 2) - square.side()/2;
59           painter.mbk(centerOffset);
60   
61           // Paint the row of squares.
62           int painted = 0;
63           while (painted < squaresToPaint){
64               paintOneSquare(painter, square);
65               painter.mfd(square.side());
66               painted = painted + 1;
67           }
68   
69           // Make the method invariant with respect to painter position.
70           painter.mbk(centerOffset + square.side());
71       }
72   
73       private void paintOneSquare(SPainter painter, SSquare square){
74           square.s2();
75           painter.setColor(randomColor());
76           painter.paint(square);
77           painter.setColor(Color.BLACK);
78           painter.draw(square);
79           square.x2();
80   
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 HirstSquares() {
110          paintTheImage();
111      }
112  
113      public static void main(String[] args) {
114          SwingUtilities.invokeLater(new Runnable() {
115              public void run() {
116                  new HirstSquares();
117              }
118          });
119      }
120  }
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