1    package npw;
2    
3    import painter.SPainter;
4    import shapes.SCircle;
5    
6    import javax.swing.*;
7    import java.awt.*;
8    import java.util.Random;
9    import java.util.Scanner;
10   
11   public class SimpleDots {
12   
13       private static String  String;
14   
15       private void paintTheImage() {
16           // Get the input information
17           int radius = getNumber("circle radius");
18           int side = getNumber("Inside circles");
19           String color = getColor("Color Name");
20   
21           // Establish the painter
22           SPainter painter = new SPainter("Circle of Circles", radius * 2 + 50, radius * 2 + 50);
23           painter.setBrushWidth(3);
24           SCircle circle = new SCircle(radius);
25           SCircle square = new SCircle(side);
26   
27           if (color.equalsIgnoreCase("red")) {
28               painter.setColor(Color.red);
29           } else if ((color.equalsIgnoreCase("blue"))){
30               painter.setColor(Color.blue);
31           } else if (color.equalsIgnoreCase("green")){
32               painter.setColor(Color.green);
33           } else {
34               painter.setColor(Color.black);
35           }
36   
37           // Paint the squares
38           paintCircleOfSquares(painter, circle, square);
39       }
40   
41       private void paintCircleOfSquares(SPainter painter, SCircle circle, SCircle square) {
42           // Position the painter to begin drawing the rows
43           painter.mfd(circle.radius());
44           painter.tr();
45           // Paint the circle of squares
46           double moved = 0;
47           while (moved < circle.diameter()) {
48               double chord = chordLength(circle.radius() - moved, circle);
49               int squares = squaresOnLineCount(chord, square.diameter());
50               paintRow(painter, square, squares);
51               nextRow(painter, square.diameter());
52               moved = moved + square.diameter();
53           }
54           // Make the method invariant with respect to painter position
55           painter.tl();
56           painter.mfd(circle.radius());
57       }
58   
59       // Move to the next row
60       private void nextRow(SPainter painter, double rowHeight) {
61           painter.tr();
62           painter.mfd(rowHeight);
63           painter.tl();
64       }
65   
66       // Assumes the painter is at the center of the row to paint, facing right.
67       private void paintRow(SPainter painter, SCircle square, int squaresToPaint) {
68           // Move backward 1/2 of the length we're painting to get ready to paint the row.
69           double centerOffset = ((squaresToPaint * square.diameter()) / 2) - square.diameter() / 2;
70           painter.mbk(centerOffset);
71   
72           // Paint the row of squares.
73           int painted = 0;
74           while (painted < squaresToPaint) {
75               paintOneSquare(painter, square);
76               painter.mfd(square.diameter());
77               painted = painted + 1;
78           }
79   
80           // Make the method invariant with respect to painter position.
81           painter.mbk(centerOffset + square.diameter());
82       }
83   
84       private void paintOneSquare(SPainter painter, SCircle square) {
85           square.s2();
86           painter.paint(square);
87           square.x2();
88       }
89   
90       private static int squaresOnLineCount(double lineLength, double sideLength) {
91           int squares = ((int) Math.ceil((lineLength - sideLength) / sideLength) + 1);
92           return squares;
93       }
94   
95       private double chordLength(double yOffset, SCircle circle) {
96           double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
97           double chordLength = xLength * 2;
98           return chordLength;
99       }
100  
101      private static int getNumber(String prompt) {
102          String nss = JOptionPane.showInputDialog(null, prompt + "?");
103          Scanner scanner = new Scanner(nss);
104          return scanner.nextInt();
105      }
106      private static String getColor(String prompt) {
107          String nss = JOptionPane.showInputDialog(null, prompt + "?");
108          Scanner scanner = new Scanner(nss);
109          return scanner.nextLine();
110      }
111  
112      public SimpleDots() {
113          paintTheImage();
114      }
115  
116      public static void main(String[] args) {
117          SwingUtilities.invokeLater(new Runnable() {
118              public void run() {
119                  new SimpleDots();
120              }
121          });
122      }
123  }
124