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 SimpleDots {
13       private void paintTheImage(){
14           // Get the input information
15           int radius = getNumber("circle radius");
16           int side = getNumber("square side length");
17           String color = getColor("Color?") ;
18   
19           // Establish the painter
20           SPainter painter = new SPainter("Hirst Squares", radius*2+50, radius*2+50);
21           painter.setBrushWidth(3);
22           SCircle circle = new SCircle(radius);
23           SSquare square = new SSquare(side);
24   
25           paintColor(color, painter);
26   
27           // Paint the squares
28           paintCircleOfSquares(painter, circle, square);
29       }
30   
31           private static String getColor(String prompt){
32               String nss = JOptionPane.showInputDialog(null, prompt + "?");
33               Scanner scanner = new Scanner(nss);
34               return scanner.next();
35           }
36   private void paintColor(String color,SPainter painter){
37           if (color.equalsIgnoreCase("Blue")){
38               painter.setColor(Color.blue);
39           }
40           else if (color.equalsIgnoreCase("Red")){
41               painter.setColor(Color.red);
42       }
43           else if (color.equalsIgnoreCase("Green")) {
44               painter.setColor(Color.green);
45       }
46   
47   }
48       private void paintCircleOfSquares(SPainter painter, SCircle circle, SSquare square){
49           // Position the painter to begin drawing the rows
50           painter.mfd(circle.radius());
51           painter.tr();
52           // Paint the circle of squares
53           double moved = 0;
54           while (moved < circle.diameter()) {
55               double chord = chordLength(circle.radius() - moved, circle);
56               int squares = squaresOnLineCount(chord, square.side());
57               paintRow(painter, square, squares);
58               nextRow(painter, square.side());
59               moved = moved + square.side();
60           }
61           // Make the method invariant with respect to painter position
62           painter.tl();
63           painter.mfd(circle.radius());
64       }
65   
66       // Move to the next row
67       private void nextRow(SPainter painter, double rowHeight){
68           painter.tr();
69           painter.mfd(rowHeight);
70           painter.tl();
71       }
72   
73       // Assumes the painter is at the center of the row to paint, facing right.
74       private void paintRow(SPainter painter, SSquare square, int squaresToPaint){
75           // Move backward 1/2 of the length we're painting to get ready to paint the row.
76           double centerOffset = ( (squaresToPaint * square.side()) / 2) - square.side()/2;
77           painter.mbk(centerOffset);
78   
79           // Paint the row of squares.
80           int painted = 0;
81           while (painted < squaresToPaint){
82               paintOneSquare(painter, square);
83               painter.mfd(square.side());
84               painted = painted + 1;
85           }
86   
87           // Make the method invariant with respect to painter position.
88           painter.mbk(centerOffset + square.side());
89       }
90   
91       private void paintOneSquare(SPainter painter, SSquare square){
92           square.s2();
93           painter.paint(square.inscribingCircle());
94           painter.draw(square.inscribingCircle());
95           square.x2();
96       }
97   
98       private static int squaresOnLineCount(double lineLength, double sideLength){
99           int squares = ( (int)Math.ceil( ( lineLength - sideLength ) / sideLength ) + 1);
100          return squares;
101      }
102  
103      private double chordLength(double yOffset, SCircle circle){
104          double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
105          double chordLength = xLength * 2;
106          return chordLength;
107      }
108  
109      private static int getNumber(String prompt) {
110          String nss = JOptionPane.showInputDialog(null,prompt+"?");
111          Scanner scanner = new Scanner(nss);
112          return scanner.nextInt();
113      }
114  
115      private static Color randomColor() {
116          Random rgen = new Random();
117          int r = rgen.nextInt(256);
118          int g = rgen.nextInt(256);
119          int b = rgen.nextInt(256);
120          return new Color(r,g,b);
121      }
122  
123      public SimpleDots() {
124          paintTheImage();
125      }
126  
127      public static void main(String[] args) {
128          SwingUtilities.invokeLater(new Runnable() {
129              public void run() {
130                  new SimpleDots ();
131              }
132          });
133      }
134  
135  }