1    package npw;
2    /* 
3     * A program to paint, centered on the canvas, a circle of colored circles 
4     * In this program, we will add spaces between each circle 
5     */
6    
7    import painter.SPainter;
8    import shapes.SCircle;
9    import shapes.SSquare;
10   import javax.swing.*;
11   import java.awt.*;
12   import java.util.Random;
13   import java.util.Scanner;
14   
15   public class SimpleDots {
16       private void paintTheImage(){
17           // Get the input info
18           int bigRadius = getNumber("Overall circle radius");
19           int individualRadius = getNumber("Individual circle radius");
20           String color = getColor("What color circles");
21   
22           // Establish a painter
23           SPainter painter = new SPainter("Circle of circles", bigRadius*2+50, bigRadius*2+50);
24           painter.setBrushWidth(3);
25           SCircle totalCircle = new SCircle(bigRadius);
26           SCircle individualCircle = new SCircle(individualRadius);
27   
28           // Paint the squares
29           paintSimpleDots(painter, totalCircle, individualCircle, color);
30       }
31   
32       private void paintSimpleDots(SPainter painter, SCircle bCircle, SCircle iCircle, String color){
33           // Position the painter to begin drawing rows
34           painter.mfd(bCircle.radius());
35           painter.tr();
36           // Paint the circle of squares
37           double moved = 0;
38           while (moved < bCircle.diameter()) {
39               double chord = chordLength(bCircle.radius() - moved, bCircle);
40               int squares = squaresOnLineCount(chord, iCircle.diameter());
41               paintRow(painter, iCircle, squares, color);
42               nextRow(painter, iCircle.diameter());
43               moved = moved + iCircle.diameter();
44           }
45           // Invariance
46           painter.tl();
47           painter.mfd(bCircle.radius());
48       }
49   
50       // Move to next row
51       private void nextRow(SPainter painter, double rowHeight){
52           painter.tr();
53           painter.mfd(rowHeight);
54           painter.tl();
55       }
56   
57       // Assumes the painter is at the center of the row to paint, facing right.
58       private void paintRow(SPainter painter, SCircle iCircle, int squaresToPaint, String color){
59           // Move backward 1/2 of the length we're painting to get ready to paint the row.
60           double centerOffset = ( (squaresToPaint * iCircle.diameter()) / 2) - iCircle.diameter()/2;
61           painter.mbk(centerOffset);
62   
63           // Paint the row of circles.
64           int painted = 0;
65           while (painted < squaresToPaint){
66               paintOneCircle(painter, iCircle, color);
67               painter.mfd(iCircle.diameter());
68               painted = painted + 1;
69           }
70   
71           // Make the method invariant w/ respect to painter position.
72           painter.mbk(centerOffset + iCircle.diameter());
73       }
74   
75       private void paintOneCircle(SPainter painter, SCircle iCircle, String color){
76           iCircle.s2();
77           if(color == null){color = "exit";} //user clicked on cancel
78           if(color.equalsIgnoreCase("red")){
79               painter.setColor(Color.RED);
80               painter.paint(iCircle);
81           }
82           else if(color.equalsIgnoreCase("blue")){
83               painter.setColor(Color.BLUE);
84               painter.paint(iCircle);
85           }
86           else if(color.equalsIgnoreCase("green")){
87               painter.setColor(Color.GREEN);
88               painter.paint(iCircle);
89           }
90           else if(color.equalsIgnoreCase("help")){
91               JOptionPane.showMessageDialog(null, "Valid colors are: " + "RED | GREEN | BLUE | HELP | EXIT ");
92           }
93           else if(color.equalsIgnoreCase("exit")){
94               painter.end();
95               System.out.println("Thank you for viewing the circles...");
96           }
97           else {
98               painter.setColor(Color.BLACK);
99               painter.paint(iCircle);
100              //Could implement error message if desired:
101              //JOptionPane.showMessageDialog(null, "Unrecognizable command: ");
102          }
103  
104          //Remove random colors
105          //painter.setColor(randomColor());
106          //painter.paint(iCircle);
107  
108          //Remove black outline from circles:
109          //painter.setColor(Color.BLACK);
110          //painter.draw(iCircle);
111  
112          iCircle.x2();
113      }
114  
115      private static int squaresOnLineCount(double lineLength, double sideLength){
116          int circles = ( (int)Math.ceil( ( lineLength - sideLength ) / sideLength ) + 1);
117          return circles;
118      }
119  
120      private double chordLength(double yOffset, SCircle circle){
121          double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
122          double chordLength = xLength * 2;
123          return chordLength;
124      }
125  
126      private static int getNumber(String prompt) {
127          String nss = JOptionPane.showInputDialog(null,prompt+"?");
128          Scanner scanner = new Scanner(nss);
129          return scanner.nextInt();
130      }
131  
132      private String getColor(String prompt) {
133          String nss = JOptionPane.showInputDialog(null,prompt+"?");
134          Scanner scanner = new Scanner(nss);
135          return scanner.next();
136      }
137  
138      private static Color randomColor() {
139          Random rgen = new Random();
140          int r = rgen.nextInt(256);
141          int g = rgen.nextInt(256);
142          int b = rgen.nextInt(256);
143          return new Color(r,g,b);
144      }
145  
146      public SimpleDots() {
147          paintTheImage();
148      }
149  
150      public static void main(String[] args) {
151          SwingUtilities.invokeLater(new Runnable() {
152              public void run() {
153                  new SimpleDots();
154              }
155          });
156      }
157  }
158