1    /* 
2     * A program to paint, centered on the canvas, a circle of randomly colored, black-framed squares with 
3     * spaces inbetween them 
4     */
5    
6    package npw;
7    
8    import painter.SPainter;
9    import shapes.SCircle;
10   import shapes.SSquare;
11   
12   import javax.swing.*;
13   import java.awt.*;
14   import java.util.Random;
15   import java.util.Scanner;
16   import javax.swing.JOptionPane;
17   import javax.swing.SwingUtilities;
18   
19   public class SimpleDots {
20   
21       private void paintTheImage(){
22           // Get the input information
23           int radius = getNumber("circle radius length");
24           int side = getNumber("dot radius length");
25   
26           // Establish the painter
27           SPainter painter = new SPainter("Circle of Squares", radius*2+50, radius*2+50);
28           painter.setBrushWidth(3);
29           SCircle circle = new SCircle(radius);
30           SCircle dot = new SCircle(side);
31   
32           Scanner scanner = new Scanner(System.in);
33           String command = JOptionPane.showInputDialog(null, "Command?");
34           if (command.equalsIgnoreCase("Red"))   {
35               painter.setColor(Color.red);
36   
37           } else if (command.equalsIgnoreCase("Blue")) {
38               painter.setColor(Color.blue);
39   
40           } else if (command.equalsIgnoreCase("Green")) {
41               painter.setColor(Color.green);
42           } else {
43               painter.setColor(Color.black);
44           }
45   
46           // Paint the squares
47           paintSimpleDots(painter, circle, dot);
48   
49   
50       }
51   
52   
53       private void paintSimpleDots(SPainter painter, SCircle circle, SCircle dot){
54           // Position the painter to begin drawing the rows
55           painter.mfd(circle.radius());
56           painter.tr();
57           // Paint the circle of squares
58           double moved = 0;
59           while (moved < circle.diameter()) {
60               double chord = chordLength(circle.radius() - moved, circle);
61               int squares = squaresOnLineCount(chord, dot.radius());
62               paintRow(painter, dot , squares);
63               nextRow(painter, dot.radius());
64               moved = moved + dot.radius();
65           }
66           // Make the method invariant with respect to painter position
67           painter.tl();
68           painter.mfd(circle.radius());
69       }
70   
71       // Move to the next row
72       private void nextRow(SPainter painter, double rowHeight){
73           painter.tr();
74           painter.mfd(rowHeight);
75           painter.tl();
76       }
77   
78       // Assumes the painter is at the center of the row to paint, facing right.
79       private void paintRow(SPainter painter, SCircle dot, int dotsToPaint){
80           // Move backward 1/2 of the length we're painting to get ready to paint the row.
81           double centerOffset = ( (dotsToPaint * dot.radius()) / 2) - dot.radius()/2;
82           painter.mbk(centerOffset);
83   
84           // Paint the row of squares.
85           int painted = 0;
86           while (painted < dotsToPaint){
87               paintOneDot(painter, dot);
88               painter.mfd(dot.radius());
89               painted = painted + 1;
90           }
91   
92           // Make the method invariant with respect to painter position.
93           painter.mbk(centerOffset + dot.radius());
94       }
95   
96       private void paintOneDot(SPainter painter, SCircle dot){
97           dot.s3();
98           painter.paint(dot);
99           dot.x3();
100  
101      }
102  
103      private static int squaresOnLineCount(double lineLength, double sideLength){
104          int squares = ( (int)Math.ceil( ( lineLength - sideLength ) / sideLength ) + 1);
105          return squares;
106      }
107  
108      private double chordLength(double yOffset, SCircle circle){
109          double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
110          double chordLength = xLength * 2;
111          return chordLength;
112      }
113  
114      private static int getNumber(String prompt) {
115          String nss = JOptionPane.showInputDialog(null,prompt+"?");
116          Scanner scanner = new Scanner(nss);
117          return scanner.nextInt();
118      }
119  
120      private static Color randomColor() {
121          Random rgen = new Random();
122          int r = rgen.nextInt(256);
123          int g = rgen.nextInt(256);
124          int b = rgen.nextInt(256);
125          return new Color(r,g,b);
126      }
127  
128      public SimpleDots() {
129          paintTheImage();
130      }
131  
132      public static void main(String[] args) {
133          SwingUtilities.invokeLater(new Runnable() {
134              public void run() {
135                  new SimpleDots();
136              }
137          });
138      }
139  }