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   
14       private void paintTheImage(){
15           // Get the input information
16           int radius = getNumber("circle radius");
17           int side = getNumber("square side length");
18           String color = getColor("Color?");
19   
20           // Establish the painter
21           SPainter painter = new SPainter("Circle of Squares", radius*2+50, radius*2+50);
22           painter.setBrushWidth(3);
23           SCircle circle = new SCircle(radius);
24           SSquare square = new SSquare(side);
25   
26           paintColor(color, painter);
27   
28   
29           // Paint the squares
30           paintCircleOfSquares(painter, circle, square);
31       }
32   
33       private void paintCircleOfSquares(SPainter painter, SCircle circle, SSquare square){
34           // Position the painter to begin drawing the rows
35           painter.mfd(circle.radius());
36           painter.tr();
37           // Paint the circle of squares
38           double moved = 0;
39           while (moved < circle.diameter()) {
40               double chord = chordLength(circle.radius() - moved, circle);
41               int squares = squaresOnLineCount(chord, square.side());
42               paintRow(painter, square, squares);
43               nextRow(painter, square.side());
44               moved = moved + square.side();
45           }
46           // Make the method invariant with respect to painter position
47           painter.tl();
48           painter.mfd(circle.radius());
49       }
50   
51       // Move to the next row
52       private void nextRow(SPainter painter, double rowHeight){
53           painter.tr();
54           painter.mfd(rowHeight);
55           painter.tl();
56       }
57   
58       // Assumes the painter is at the center of the row to paint, facing right.
59       private void paintRow(SPainter painter, SSquare square, int squaresToPaint){
60           // Move backward 1/2 of the length we're painting to get ready to paint the row.
61           double centerOffset = ( (squaresToPaint * square.side()) / 2) - square.side()/2;
62           painter.mbk(centerOffset);
63   
64           // Paint the row of squares.
65           int painted = 0;
66           while (painted < squaresToPaint){
67               paintOneSquare(painter, square);
68               painter.mfd(square.side());
69               painted = painted + 1;
70           }
71   
72           // Make the method invariant with respect to painter position.
73           painter.mbk(centerOffset + square.side());
74       }
75   
76       private void paintOneSquare(SPainter painter, SSquare square){
77           square.s2();
78           painter.paint(square.inscribingCircle());
79           painter.draw(square.inscribingCircle());
80           square.x2();
81       }
82   
83       private void paintColor(String color, SPainter painter){
84           if (color.equalsIgnoreCase("blue")){
85               painter.setColor(Color.BLUE);
86           }
87           else if (color.equalsIgnoreCase("red")){
88               painter.setColor(Color.red);
89           }
90           else if (color.equalsIgnoreCase("green")){
91               painter.setColor(Color.GREEN);
92           }
93           else if (color.equalsIgnoreCase("black")){
94               painter.setColor(Color.black);
95           }
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 String getColor(String prompt) {
116          String nss = JOptionPane.showInputDialog(null,prompt+"?");
117          Scanner scanner = new Scanner(nss);
118          return scanner.next();
119      }
120  
121      private String color (String prompt) {
122          String nss = JOptionPane.showInputDialog(null,prompt+"?");
123          Scanner scanner = new Scanner(nss);
124          return scanner.next();
125      }
126  
127      private static Color randomColor() {
128          Random rgen = new Random();
129          int r = rgen.nextInt(256);
130          int g = rgen.nextInt(256);
131          int b = rgen.nextInt(256);
132          return new Color(r,g,b);
133      }
134  
135      public SimpleDots() {
136          paintTheImage();
137      }
138  
139      public static void main(String[] args) {
140          SwingUtilities.invokeLater(new Runnable() {
141              public void run() {
142                  new SimpleDots();
143              }
144          });
145      }
146  }