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 void paintTheImage(){
14           // Get the input information
15           int radius = getNumber("circle radius");
16           int rad = getNumber("square side length");
17           String color = getcolor("color");
18           // Establish the painter
19           SPainter painter = new SPainter("Circle of Squares", radius*2+50, radius*2+50);
20           painter.setBrushWidth(3);
21           SCircle circle = new SCircle(radius);
22           SCircle dots = new SCircle(rad);
23   
24           // Paint the squares
25           paintCircleOfSquares(painter, circle, dots, color);
26       }
27   
28       private void paintCircleOfSquares(SPainter painter, SCircle circle, SCircle dots, String color){
29           // Position the painter to begin drawing the rows
30           painter.mfd(circle.radius());
31           painter.tr();
32           // Paint the circle of squares
33           double moved = 0;
34           while (moved < circle.diameter()) {
35               double chord = chordLength(circle.radius() - moved, circle);
36               int squares = squaresOnLineCount(chord, dots.radius());
37               paintRow(painter, dots, squares, color);
38               nextRow(painter, dots.radius());
39               moved = moved + dots.radius();
40   
41           }
42           // Make the method invariant with respect to painter position
43           painter.tl();
44           painter.mfd(circle.radius());
45       }
46   
47       // Move to the next row
48       private void nextRow(SPainter painter, double rowHeight){
49           painter.tr();
50           painter.mfd(rowHeight);
51           painter.tl();
52       }
53   
54       // Assumes the painter is at the center of the row to paint, facing right.
55       private void paintRow(SPainter painter, SCircle dots, int squaresToPaint, String color){
56           // Move backward 1/2 of the length we're painting to get ready to paint the row.
57           double centerOffset = ( (squaresToPaint * dots.radius()) / 2) - dots.radius()/2;
58           painter.mbk(centerOffset);
59   
60           // Paint the row of squares.
61           int painted = 0;
62           while (painted < squaresToPaint){
63               paintOneSquare(painter, dots, color);
64               painter.mfd(dots.radius());
65               painted = painted + 1;
66           }
67   
68           // Make the method invariant with respect to painter position.
69           painter.mbk(centerOffset + dots.radius());
70       }
71   
72       private void paintOneSquare(SPainter painter, SCircle dots, String color){
73           dots.s5();
74   
75           if (color.equalsIgnoreCase("blue")) {
76               painter.setColor(Color.blue);
77   
78           } else if (color.equalsIgnoreCase("red")) {
79               painter.setColor(Color.red);
80   
81           } else if (color.equalsIgnoreCase("green")) {
82               painter.setColor(Color.green);
83   
84           }
85        if (color == null) {
86           painter.setColor(Color.black);
87   
88       }
89           painter.paint(dots);
90   
91   
92   
93           dots.x5();
94       }
95   
96       private static int squaresOnLineCount(double lineLength, double sideLength){
97           int squares = ( (int)Math.ceil( ( lineLength - sideLength ) / sideLength ) + 1);
98           return squares;
99       }
100  
101      private double chordLength(double yOffset, SCircle circle){
102          double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
103          double chordLength = xLength * 2;
104          return chordLength;
105      }
106  
107      private static int getNumber(String prompt) {
108          String nss = JOptionPane.showInputDialog(null,prompt+"?");
109          Scanner scanner = new Scanner(nss);
110          return scanner.nextInt();
111      }
112      private static String getcolor(String prompt) {
113          String nss = JOptionPane.showInputDialog(null,prompt+"?");
114          Scanner scanner = new Scanner(nss);
115          return scanner.next();
116      }
117      private static Color randomColor() {
118          Random rgen = new Random();
119          int r = rgen.nextInt(256);
120          int g = rgen.nextInt(256);
121          int b = rgen.nextInt(256);
122          return new Color(r,g,b);
123      }
124  
125      public SimpleDots() {
126          paintTheImage();
127      }
128  
129      public static void main(String[] args) {
130          SwingUtilities.invokeLater(new Runnable() {
131              public void run() {
132                  new SimpleDots();
133              }
134          });
135      }
136  }
137  
138