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   import java.awt.Color;
12   
13   
14   
15   public class SimpleDots {
16   
17       private void paintTheImage() {
18           //Get the input info
19           int radius = getNumber("circle radius");
20           int diameter = getNumber("dot radius");
21           Color rgb = setTheColor ("Red, Blue, or Green");
22   
23           //Establish the painter
24           SPainter painter = new SPainter("Simple Dots", radius * 2 + 50, radius * 2 + 50);
25           painter.setBrushWidth(3);
26           painter.setColor(rgb);
27           SCircle circle = new SCircle(radius);
28           SCircle dot = new SCircle(diameter / 2);
29   
30   
31           //Paint the dots
32           paintCircleOfDots(painter, circle, dot);
33       }
34   
35       private Color setTheColor(String rgb) {
36           //creating the color for the dots (red or blue or green if else then black
37           Color color = new Color(0, 0, 0);
38           String setTheColor = JOptionPane.showInputDialog(null, rgb);
39           if (setTheColor == null) {
40               color = Color.BLACK;
41           } else if (setTheColor.equalsIgnoreCase("Red")) {
42               color = Color.RED;
43           } else if (setTheColor.equalsIgnoreCase("Blue")) {
44               color = Color.BLUE;
45           } else if (setTheColor.equalsIgnoreCase("Green")) {
46               color = Color.GREEN;
47           }
48           return color;
49       }
50   
51   
52       private void paintCircleOfDots(SPainter painter, SCircle circle, SCircle dot) {
53           //Position the painter to begin drawing the rows
54           painter.mfd(circle.radius());
55           painter.tr();
56           // Paint the circle of dots
57           double moved = 0;
58           while (moved < circle.diameter()) {
59               double chord = chordLength(circle.radius() - moved, circle);
60               int dots = dotOnLineCount(chord, dot.diameter() / 2);
61               paintRow(painter, dot, dots);
62               nextRow(painter, (dot.diameter() / 2));
63               moved = moved + (dot.diameter() / 2);
64           }
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.diameter() / 4) - dot.diameter() / 4);
82           painter.mbk(centerOffset);
83   
84           //Paint the row of dots.
85           int painted = 0;
86           while (painted < dotsToPaint) {
87               paintOneDot(painter, dot);
88               painter.mfd(dot.diameter() / 2);
89               painted = painted + 1;
90           }
91   
92           //Make the method invariant with respect to painter position.
93           painter.mbk(centerOffset + (dot.diameter() / 2));
94       }
95   
96       private void paintOneDot(SPainter painter, SCircle dot) {
97           dot.s3();
98           painter.paint(dot);
99           dot.x3();
100      }
101  
102      private static int dotOnLineCount(double lineLength, double diameterLength) {
103          int dots = ((int) Math.ceil((lineLength - diameterLength) / diameterLength) + 1);
104          return dots;
105      }
106  
107      private double chordLength(double yOffset, SCircle circle) {
108          double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
109          double chordLength = xLength * 2;
110          return chordLength;
111      }
112  
113      private static int getNumber(String prompt) {
114          String nss = JOptionPane.showInputDialog(null, prompt + "?");
115          Scanner scanner = new Scanner(nss);
116          return scanner.nextInt();
117      }
118  
119      public SimpleDots() {
120                  paintTheImage();
121              }
122  
123              public static void main (String[]args){
124                  SwingUtilities.invokeLater(new Runnable() {
125                      @Override
126                      public void run() {
127                          new SimpleDots();
128                      }
129                  });
130              }
131          }
132  
133