1    /* 
2     * A program to paint, centered on the canvas, a circle of uniformly colored, unframed dots; a simple variant of the HirstDots program. 
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   import javax.swing.JOptionPane;
14   
15   public class SimpleDots {
16   
17   
18       private void paintTheImage() {
19           // Get the input information
20           int radius = getNumber("circle radius");
21           int radius2 = getNumber("circle radius2");
22           String color = getColor("Red | Blue | Green ");
23   
24           // Establish the painter
25           SPainter painter = new SPainter("Simple Dots", radius * 2 + 50, radius * 2 + 50);
26           painter.setBrushWidth(3);
27           SCircle circle = new SCircle(radius);
28           SCircle dot = new SCircle(radius2);
29   
30           // Paint the squares
31           paintSimpleDots(painter, circle, dot, color);
32   
33       }
34   
35       private void paintSimpleDots(SPainter painter, SCircle circle, SCircle dot, String color) {
36           // Position the painter to begin drawing the rows
37           painter.mfd(circle.radius());
38           painter.tr();
39           // Paint the circle of dots- Hirst
40           double moved = 0;
41           while (moved < circle.diameter()) {
42               double chord = chordLength(circle.radius() - moved, circle);
43               int dots = dotsOnLineCount(chord, dot.radius());
44               paintRow(painter, dot, dots, color);
45               nextRow(painter, dot.radius());
46               moved = moved + dot.radius();
47           }
48           // Make the method invariant with respect to painter position
49           painter.tl();
50           painter.mfd(circle.radius());
51       }
52   
53       // Move to the next row
54       private void nextRow(SPainter painter, double rowHeight) {
55           painter.tr();
56           painter.mfd(rowHeight);
57           painter.tl();
58       }
59   
60       // Assumes the painter is at the center of the row to paint, facing right.
61       private void paintRow(SPainter painter, SCircle dot, int dotsToPaint, String color) {
62           // Move backward 1/2 of the length we're painting to get ready to paint the row.
63           double centerOffset = ((dotsToPaint * dot.radius()) / 2) - dot.radius() / 2;
64           painter.mbk(centerOffset);
65   
66           // Paint the row of dots.
67           int painted = 0;
68           while (painted < dotsToPaint) {
69               paintOneDot(painter, dot, color);
70               painter.mfd(dot.radius());
71               painted = painted + 1;
72           }
73   
74           // Make the method invariant with respect to painter position.
75           painter.mbk(centerOffset + dot.radius());
76       }
77   
78       private void paintOneDot(SPainter painter, SCircle dot, String color) {
79           if (color.equalsIgnoreCase("Blue")) {
80               painter.setColor(Color.BLUE);
81           } else if (color.equalsIgnoreCase("Red")) {
82               painter.setColor(Color.RED);
83           } else if (color.equalsIgnoreCase("Green")) {
84               painter.setColor(Color.GREEN);
85           } else {
86               painter.setColor(Color.BLACK);
87           }
88           dot.s3();
89           painter.paint(dot);
90           //painter.draw(dot);
91           dot.x3();
92       }
93   
94       private static int dotsOnLineCount(double lineLength, double sideLength) {
95           int dots = ((int) Math.ceil((lineLength - sideLength) / sideLength) + 1);
96           return dots;
97       }
98   
99       private double chordLength(double yOffset, SCircle circle) {
100          double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
101          double chordLength = xLength * 2;
102          return chordLength;
103      }
104  
105      private static int getNumber(String prompt) {
106          String nss = JOptionPane.showInputDialog(null, prompt + "?");
107          Scanner scanner = new Scanner(nss);
108          return scanner.nextInt();
109      }
110  
111      private static String getColor (String prompt){
112          String color = JOptionPane.showInputDialog(null,prompt+"?");
113          Scanner scanner = new Scanner(color);
114          return scanner.next();
115      }
116      private static Color randomColor() {
117          Random rgen = new Random();
118          int r = rgen.nextInt(256);
119          int g = rgen.nextInt(256);
120          int b = rgen.nextInt(256);
121          return new Color(r, g, b);
122      }
123  
124      public SimpleDots() {
125          paintTheImage();
126      }
127  
128      public static void main(String[] args) {
129          SwingUtilities.invokeLater(new Runnable() {
130              public void run() {
131                  new SimpleDots();
132              }
133          });
134      }
135  }