1    package npw;
2    
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   
16       private void paintTheImage(){
17           // Get the input information
18           int radius = getNumber("circle radius");
19           int side = getNumber("square side length");
20   
21           // Establish the painter
22           SPainter painter = new SPainter("Circle of Squares", radius*2+50, radius*2+50);
23           painter.setBrushWidth(3);
24           SCircle circle = new SCircle(radius);
25           SSquare square = new SSquare(side);
26   
27           // Paint the squares
28           paintCircleOfSquares(painter, circle, square);
29       }
30   
31       private void paintCircleOfSquares(SPainter painter, SCircle circle, SSquare 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.side());
40               paintRow(painter, square, squares);
41               nextRow(painter, square.side());
42               moved = moved + square.side();
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, SSquare 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.side()) / 2) - square.side()/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.side());
67               painted = painted + 1;
68           }
69   
70           // Make the method invariant with respect to painter position.
71           painter.mbk(centerOffset + square.side());
72       }
73   
74       private void paintOneSquare(SPainter painter, SSquare square){
75          square.s2();
76           painter.setColor(randomColor());
77           painter.paint(square);
78   
79           painter.setColor(Color.BLACK);
80           painter.draw(square);
81   
82   
83   square.x2();
84       }
85   
86       private static int squaresOnLineCount(double lineLength, double sideLength){
87           int squares = ( (int)Math.ceil( ( lineLength - sideLength ) / sideLength ) + 1);
88           return squares;
89       }
90   
91       private double chordLength(double yOffset, SCircle circle){
92           double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
93           double chordLength = xLength * 2;
94           return chordLength;
95       }
96   
97       private static int getNumber(String prompt) {
98           String nss = JOptionPane.showInputDialog(null,prompt+"?");
99           Scanner scanner = new Scanner(nss);
100          return scanner.nextInt();
101      }
102  
103      private static Color randomColor() {
104          Random rgen = new Random();
105          int r = rgen.nextInt(256);
106          int g = rgen.nextInt(256);
107          int b = rgen.nextInt(256);
108          return new Color(r,g,b);
109      }
110  
111      public HirstSquares() {
112          paintTheImage();
113      }
114  
115      public static void main(String[] args) {
116          SwingUtilities.invokeLater(new Runnable() {
117              public void run() {
118                  new HirstSquares();
119              }
120          });
121      }
122  }
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