1    package npw;
2    
3    import painter.SPainter;
4    import shapes.SCircle;
5    import shapes.SSquare;
6    
7    import javax.swing.*;
8    import java.awt.*;
9    import java.util.Random;
10   import java.util.Scanner;
11   
12   public class CircleOfSquares {
13   
14       private void paintTheImage(){
15           int radius = getNumber("circle radius");
16           int side = getNumber("square side length");
17           SPainter painter = new SPainter("Circle of Squares", radius*2+50, radius*2+50);
18           painter.setBrushWidth(3);
19           SCircle circle = new SCircle(radius);
20           SSquare square = new SSquare(side);
21           paintCircleOfSquares(painter, circle, square);
22       }
23   
24       private void paintCircleOfSquares(SPainter painter, SCircle circle, SSquare square){
25           painter.mfd(circle.radius());
26           painter.tr();
27           double moved = 0;
28           while (moved < circle.diameter()) {
29               double chord = chordLength(circle.radius() - moved, circle);
30               int squares = squaresOnLineCount(chord, square.side());
31               paintRow(painter, square, squares);
32               nextRow(painter, square.side());
33               moved = moved + square.side();
34           }
35           painter.tl();
36           painter.mfd(circle.radius());
37       }
38   
39       private void nextRow(SPainter painter, double rowHeight){
40           painter.tr();
41           painter.mfd(rowHeight);
42           painter.tl();
43       }
44   
45       private void paintRow(SPainter painter, SSquare square, int squaresToPaint){
46           double centerOffset = ( (squaresToPaint * square.side()) / 2) - square.side()/2;
47           painter.mbk(centerOffset);
48           int painted = 0;
49           while (painted < squaresToPaint){
50               paintOneSquare(painter, square);
51               painter.mfd(square.side());
52               painted = painted + 1;
53           }
54           painter.mbk(centerOffset + square.side());
55       }
56   
57       private void paintOneSquare(SPainter painter, SSquare square){
58           painter.setColor(randomColor());
59           painter.paint(square);
60           painter.setColor(Color.BLACK);
61           painter.draw(square);
62       }
63   
64       private static int squaresOnLineCount(double lineLength, double sideLength){
65           int squares = ( (int)Math.ceil( ( lineLength - sideLength ) / sideLength ) + 1);
66           return squares;
67       }
68   
69       private double chordLength(double yOffset, SCircle circle){
70           double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
71           double chordLength = xLength * 2;
72           return chordLength;
73       }
74   
75       private static int getNumber(String prompt) {
76           String nss = JOptionPane.showInputDialog(null,prompt+"?");
77           Scanner scanner = new Scanner(nss);
78           return scanner.nextInt();
79       }
80   
81       private static Color randomColor() {
82           Random rgen = new Random();
83           int r = rgen.nextInt(256);
84           int g = rgen.nextInt(256);
85           int b = rgen.nextInt(256);
86           return new Color(r,g,b);
87       }
88   
89       public CircleOfSquares() {
90           paintTheImage();
91       }
92   
93       public static void main(String[] args) {
94           SwingUtilities.invokeLater(new Runnable() {
95               public void run() {
96                   new CircleOfSquares();
97               }
98           });
99       }
100  }