1    /* 
2     * A program to paint, centered on the canvas, a circle of randomly colored, black-framed squares. 
3     */
4    
5    package npw;
6    
7    import painter.SPainter;
8    import shapes.SCircle;
9    
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 input
18           int radius = getNumber("circle radius");
19           int side = getNumber("circle radius");
20   
21           // Establish the painter
22           SPainter painter = new SPainter("Circle of Squares", radius*2+50, radius*2+50);
23           painter.setBrushWidth(3);
24           SCircle bigCircle = new SCircle(radius);
25           SCircle littleCircle = new SCircle(side);
26   
27           // paint the squares
28           paintCircleOfSquares(painter, bigCircle, littleCircle);
29       }
30   
31       // Ask user for input
32       public static String userInput(String prompt) {
33           String nss = JOptionPane.showInputDialog(null, prompt);
34           Scanner scanner = new Scanner(nss);
35           return scanner.next();
36       }
37   
38   
39       private void paintCircleOfSquares(SPainter painter, SCircle bigCircle, SCircle littleCircle) {
40           // position the painter to begin drawing the rows
41           painter.mfd(bigCircle.radius());
42           painter.tr();
43           String userText = userInput("Enter a color?");
44           if (userText.equalsIgnoreCase("red")) {
45               painter.setColor(Color.red);
46           }
47           else if (userText.equalsIgnoreCase("blue")) {
48               painter.setColor(Color.blue);
49           }
50           else if (userText.equalsIgnoreCase("green")) {
51               painter.setColor(Color.green);
52           }else {
53               System.out.println("Invalid color! Please enter a color of blue, red, or green.");
54           }
55           // paint the circle of squares
56           double moved = 0;
57           while ( moved < bigCircle.diameter() ) {
58               double chord = chordLength(bigCircle.radius() - moved, bigCircle);
59               int squares = squaresOnLineCount(chord, littleCircle.radius()*2);
60               paintRow(painter, littleCircle, squares);
61               nextRow(painter, littleCircle.radius()*2);
62               moved = moved + littleCircle.radius()*2;
63           }
64           // make the method with respect to painter position
65           painter.tl();
66           painter.mfd(bigCircle.radius());
67       }
68   
69       // Move to the next row
70       private void nextRow(SPainter painter, double rowHeight) {
71           painter.tr();
72           painter.mfd(rowHeight);
73           painter.tl();
74       }
75   
76       // Assumes the painter is at the center of the row to paint, facing right.
77       private void paintRow(SPainter painter, SCircle circle, int squaresToPaint) {
78   
79           // Move backward 1/2 of the length in respect to painting to get ready to paint row.
80           double centerOffSet = ( (squaresToPaint * circle.radius()) - circle.radius());
81           painter.mbk(centerOffSet);
82   
83           // Paint the row of squares.
84           int painted = 0;
85           while ( painted < squaresToPaint ) {
86               paintOneSquare(painter, circle);
87               painter.mfd(circle.radius()*2);
88               painted = painted + 1;
89           }
90           // Make the method in respect to painted position.
91           painter.mbk(centerOffSet + circle.radius()*2);
92       }
93   
94       private void paintOneSquare(SPainter painter, SCircle circle) {
95   
96           circle.s2();
97           painter.paint(circle);
98   
99           circle.x2();
100      }
101  
102      private static int squaresOnLineCount(double lineLength, double sideLength) {
103          int circle = ( (int)Math.ceil(( lineLength - sideLength) / sideLength)+1);
104          return circle;
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      public 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 static Color randomColor() {
120          Random rgen = new Random();
121          int r = rgen.nextInt(256);
122          int g = rgen.nextInt(256);
123          int b = rgen.nextInt(256);
124  
125          return new Color(r,g,b);
126      }
127  
128      public simpleDots() {
129          paintTheImage();
130      }
131  
132      public static void main(String[] args) {
133          SwingUtilities.invokeLater(new Runnable() {
134              public void run() {
135                  new simpleDots();
136              }
137          });
138      }
139  }
140