1    /* 
2     * A program to paint, centered on the canvas, a circle of randomly colored, circles. 
3     */
4    package npw;
5    
6    import painter.SPainter;
7    import shapes.SCircle;
8    
9    import javax.swing.*;
10   import java.awt.*;
11   import java.util.Random;
12   import java.util.Scanner;
13   
14   public class SimpleDots {
15   
16       private void paintTheImage(){
17           // Get the input information
18           int radius = getNumber("circle radius");
19           int altRadius = getNumber("small circle radius");
20           String command = getColor("Valid commands are: ");
21   
22           // Establish the painter
23           SPainter painter = new SPainter("Hirst Dots", radius*2+50, radius*2+50);
24           painter.setBrushWidth(3);
25           SCircle circle = new SCircle(radius);
26           SCircle altCircle = new SCircle(altRadius);
27   
28           // Paint the squares
29           paintHirstSquares(painter, circle, altCircle, command);
30       }
31   
32       private String getColor(String prompt) {
33           String rgbb = JOptionPane.showInputDialog(null,prompt +
34                   "RED | GREEN | BLUE | OTHER");
35           return rgbb;
36       }
37   
38       private void paintHirstSquares(SPainter painter, SCircle circle, SCircle altCircle, String command){
39           // Position the painter to begin drawing the rows
40           painter.mfd(circle.radius());
41           painter.tr();
42           // Paint the circle of squares
43           double moved = 0;
44           while (moved < circle.diameter()) {
45               double chord = chordLength(circle.radius() - moved, circle);
46               int circles = circlesOnLineCount(chord, altCircle.radius());
47               paintRow(painter, altCircle, circles, command);
48               nextRow(painter, altCircle.radius());
49               moved = moved + altCircle.radius();
50           }
51           // Make the method invariant with respect to painter position
52           painter.tl();
53           painter.mfd(circle.radius());
54       }
55   
56       // Move to the next row
57       private void nextRow(SPainter painter, double rowHeight){
58           painter.tr();
59           painter.mfd(rowHeight);
60           painter.tl();
61       }
62   
63       // Assumes the painter is at the center of the row to paint, facing right.
64       private void paintRow(SPainter painter, SCircle altCircle, int circlesToPaint, String command){
65           // Move backward 1/2 of the length we're painting to get ready to paint the row.
66           double centerOffset = ( (circlesToPaint * altCircle.radius()) / 2) - altCircle.radius()/2;
67           painter.mbk(centerOffset);
68   
69           // Paint the row of squares.
70           int painted = 0;
71           while (painted < circlesToPaint){
72               paintOneSquare(painter, altCircle, command);
73               painter.mfd(altCircle.radius());
74               painted = painted + 1;
75           }
76   
77           // Make the method invariant with respect to painter position.
78           painter.mbk(centerOffset + altCircle.radius());
79       }
80   
81       private void paintOneSquare(SPainter painter, SCircle altCircle, String command){
82           altCircle.s2();
83           if (command.equals("red")) {
84               painter.setColor(Color.RED);
85               painter.paint(altCircle);
86           } else if (command.equals("green")) {
87               painter.setColor(Color.GREEN);
88               painter.paint(altCircle);
89           } else if (command.equals("blue")) {
90               painter.setColor(Color.BLUE);
91               painter.paint(altCircle);
92           } else {
93               painter.setColor(Color.BLACK);
94               painter.paint(altCircle);
95           }
96           altCircle.x2();
97       }
98   
99       private static int circlesOnLineCount(double lineLength, double sideLength){
100          int circles = ( (int)Math.ceil( ( lineLength - sideLength ) / sideLength ) + 1);
101          return circles;
102      }
103  
104      private double chordLength(double yOffset, SCircle circle){
105          double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
106          double chordLength = xLength * 2;
107          return chordLength;
108      }
109  
110      private static int getNumber(String prompt) {
111          String nss = JOptionPane.showInputDialog(null,prompt+"?");
112          Scanner scanner = new Scanner(nss);
113          return scanner.nextInt();
114      }
115  
116  
117      public SimpleDots() {
118          paintTheImage();
119      }
120  
121      public static void main(String[] args) {
122          SwingUtilities.invokeLater(new Runnable() {
123              public void run() {
124                  new SimpleDots();
125              }
126          });
127      }
128  }