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    import shapes.SSquare;
10   
11   import javax.swing.*;
12   import java.awt.*;
13   import java.util.Random;
14   import java.util.Scanner;
15   
16   public class SimpleDots {
17   
18       private void paintTheImage(){
19           // Get the input information
20           int radius = getNumber("What would you like the circle radius to be");
21           int side = (getNumber("What would you like the small circle radius to be")) * 2;
22           int ColorNumber = getNumber("(Choose a number either 1=Red  2=Blue 3=Green or any other number");
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           SSquare square = new SSquare(side);
29   
30           // Set the painter color
31           SetPainterColor(ColorNumber, painter);
32   
33           // Paint the squares
34           paintCircleOfSquares(painter, circle, square);
35       }
36   
37       private void paintCircleOfSquares(SPainter painter, SCircle circle, SSquare square){
38           // Position the painter to begin drawing the rows
39           painter.mfd(circle.radius());
40           painter.tr();
41           // Paint the circle of squares
42           double moved = 0;
43           while (moved < circle.diameter()) {
44               double chord = chordLength(circle.radius() - moved, circle);
45               int squares = squaresOnLineCount(chord, square.side());
46               paintRow(painter, square, squares);
47               nextRow(painter, square.side());
48               moved = moved + square.side();
49           }
50           // Make the method invariant with respect to painter position
51           painter.tl();
52           painter.mfd(circle.radius());
53       }
54   
55       // Move to the next row
56       private void nextRow(SPainter painter, double rowHeight){
57           painter.tr();
58           painter.mfd(rowHeight);
59           painter.tl();
60       }
61   
62       // Assumes the painter is at the center of the row to paint, facing right.
63       private void paintRow(SPainter painter, SSquare square, int squaresToPaint){
64           // Move backward 1/2 of the length we're painting to get ready to paint the row.
65           double centerOffset = ( (squaresToPaint * square.side()) / 2) - square.side()/2;
66           painter.mbk(centerOffset);
67   
68           // Paint the row of squares.
69           int painted = 0;
70           while (painted < squaresToPaint){
71               paintOneSquare(painter, square);
72               painter.mfd(square.side());
73               painted = painted + 1;
74           }
75   
76           // Make the method invariant with respect to painter position.
77           painter.mbk(centerOffset + square.side());
78       }
79   
80       private void paintOneSquare(SPainter painter, SSquare square){
81           square.s2();
82           painter.paint(square.inscribingCircle());
83           square.x2();
84       }
85   
86       private static int squaresOnLineCount(double lineLength, double sideLength){
87           int squares = ( (int)Math.ceil( ( lineLength - sideLength ) / sideLength ) + 1);
88           return squares;
89       }
90   
91       private double chordLength(double yOffset, SCircle circle){
92           double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
93           double chordLength = xLength * 2;
94           return chordLength;
95       }
96   
97       private static int getNumber(String prompt) {
98           String nss = JOptionPane.showInputDialog(null,prompt+"?");
99           Scanner scanner = new Scanner(nss);
100          return scanner.nextInt();
101      }
102  
103      private static Color randomColor() {
104          Random rgen = new Random();
105          int r = rgen.nextInt(256);
106          int g = rgen.nextInt(256);
107          int b = rgen.nextInt(256);
108          return new Color(r,g,b);
109      }
110  
111      private static void SetPainterColor(int ColorNumber, SPainter painter){
112          if (ColorNumber == 1){
113              painter.setColor(Color.RED);
114          } else if (ColorNumber == 2){
115              painter.setColor(Color.BLUE);
116          } else if (ColorNumber == 3){
117              painter.setColor(Color.GREEN);
118          } else{
119              painter.setColor(Color.BLACK);
120          }
121      }
122  
123      public SimpleDots() {
124          paintTheImage();
125      }
126  
127      public static void main(String[] args) {
128          SwingUtilities.invokeLater(new Runnable() {
129              public void run() {
130                  new SimpleDots();
131              }
132          });
133      }
134  }