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