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