1    /* 
2    * Program to paint, centered on the canvas, a circle of randomly colored,circles with spaces inbetween them sort of 
3     */
4    package npw;
5    
6    import painter.SPainter;
7    import shapes.SCircle;
8    import shapes.SSquare;
9    
10   import javax.swing.*;
11   import java.awt.*;
12   import java.util.Random;
13   import java.util.Scanner;
14   
15   public class HirstDots {
16       private void paintTheImage(){
17           int radius = getNumber("circle radius");
18           int rad = getNumber("dot diameter length");
19   
20           SPainter painter = new SPainter("Circle of Dots", radius*2+50, radius*2+50);
21           painter.setBrushWidth(3);
22           SCircle circle = new SCircle(radius);
23           SCircle dot = new SCircle(rad);
24   
25           paintCircleOfDots(painter,circle,dot);
26       }
27   
28       private void paintCircleOfDots(SPainter painter, SCircle circle, SCircle dot) {
29           painter.mfd(circle.radius());
30           painter.tr();
31   
32           double moved = 0;
33                   while ( moved < circle.diameter()) {
34                       double chord = chordLength(circle.radius() - moved, circle);
35                       int dotz = dotsOnLineCount(chord, dot.radius());
36                       paintRow(painter,dot,dotz);
37                       nextRow(painter, dot.radius());
38                       moved = moved + dot.radius();
39                   }
40                   painter.tl();
41                   painter.mfd(circle.radius());
42       }
43   
44   
45   
46   
47       private void nextRow(SPainter painter, double rowHeight) {
48           painter.tr();
49           painter.mfd(rowHeight);
50           painter.tl();
51       }
52       private void paintRow(SPainter painter, SCircle dot, int dotsToPaint) {
53           double centerOffset = ( ( dotsToPaint * dot.radius()) / 2) - dot.radius()/2;
54           painter.mbk(centerOffset);
55   
56           int painted = 0;
57           while (painted < dotsToPaint){
58               paintOneSquare(painter, dot);
59               painter.mfd(dot.radius());
60               painted = painted +1;
61           }
62   
63           painter.mbk(centerOffset + dot.radius());
64       }
65   
66       private void paintOneSquare(SPainter painter, SCircle dot) {
67           dot.s3();
68           painter.setColor(randomColor());
69           painter.paint(dot);
70           //painter.setColor(Color.BLACK);
71           //painter.draw(dot);
72           dot.x3();
73   
74   
75       }
76   
77   
78       private int dotsOnLineCount(double lineLength, double sideLength) {
79           int circles = ( (int) Math.ceil( (lineLength-sideLength )/ sideLength) + 1);
80           return circles;
81       }
82       private double chordLength(double yOffSet, SCircle circle) {
83           double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffSet, 2));
84           double chordLength = xLength * 2;
85           return chordLength;
86       }
87       private int getNumber(String prompt ) {
88           String nss = JOptionPane.showInputDialog(null,prompt+"?");
89           Scanner scanner = new Scanner(nss);
90           return scanner.nextInt();
91       }
92       private Color randomColor() {
93           Random rgen = new Random();
94           int r = rgen.nextInt(256);
95           int g = rgen.nextInt(256);
96           int b = rgen.nextInt(256);
97           return new Color(r,g,b);
98       }
99       public HirstDots() {
100          paintTheImage();
101      }
102      
103      public static void main(String[] args) {
104          SwingUtilities.invokeLater(new Runnable() {
105              public void run() {
106                  new HirstDots();
107                  
108              }
109          });
110      }
111  }
112