1    /* 
2     * A program to paint, centered on the canvas, a circle of single colored dots. 
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.Scanner;
14   
15   public class SimpleDots {
16   
17       private void paintTheImage(){
18           // Get the input information
19           int radius = getNumber("circle radius");
20           int side = getNumber("square side length");
21           String color = getColor("color name");
22   
23           // Establish the painter
24           SPainter painter = new SPainter("Circle of Squares", radius*2+50, radius*2+50);
25           painter.setBrushWidth(3);
26           SCircle circle = new SCircle(radius);
27           SSquare square = new SSquare(side);
28   
29           if (color.equalsIgnoreCase("red") ) {
30               painter.setColor(Color.RED);
31           }
32           else if (color.equalsIgnoreCase("blue")) {
33               painter.setColor(Color.BLUE);
34           }
35           else if (color.equalsIgnoreCase("green")) {
36               painter.setColor(Color.GREEN);
37           }
38           else {
39   
40               painter.setColor(Color.BLACK);
41           }
42   
43           // Paint the squares
44           paintSimpleDots(painter, circle, square);
45       }
46   
47       private void paintSimpleDots(SPainter painter, SCircle circle, SSquare square){
48           // Position the painter to begin drawing the rows
49           painter.mfd(circle.radius());
50           painter.tr();
51           // Paint the circle of squares
52           double moved = 0;
53           while (moved < circle.diameter()) {
54               double chord = chordLength(circle.radius() - moved, circle);
55               int squares = squaresOnLineCount(chord, square.side());
56               paintRow(painter, square, squares);
57               nextRow(painter, square.side());
58               moved = moved + square.side();
59           }
60           // Make the method invariant with respect to painter position
61           painter.tl();
62           painter.mfd(circle.radius());
63       }
64   
65       // Move to the next row
66       private void nextRow(SPainter painter, double rowHeight){
67           painter.tr();
68           painter.mfd(rowHeight);
69           painter.tl();
70       }
71   
72       // Assumes the painter is at the center of the row to paint, facing right.
73       private void paintRow(SPainter painter, SSquare square, int squaresToPaint){
74           // Move backward 1/2 of the length we're painting to get ready to paint the row.
75           double centerOffset = ( (squaresToPaint * square.side()) / 2) - square.side()/2;
76           painter.mbk(centerOffset);
77   
78           // Paint the row of squares.
79           int painted = 0;
80           while (painted < squaresToPaint){
81               paintOneSquare(painter, square);
82               painter.mfd(square.side());
83               painted = painted + 1;
84           }
85   
86           // Make the method invariant with respect to painter position.
87           painter.mbk(centerOffset + square.side());
88       }
89   
90       private void paintOneSquare(SPainter painter, SSquare square){
91           square.s2();
92           painter.paint(square.inscribingCircle());
93           //painter.setColor(Color.BLACK);
94           //painter.draw(square.inscribingCircle());
95           square.x2();
96       }
97   
98       private static int squaresOnLineCount(double lineLength, double sideLength){
99           int squares = ( (int)Math.ceil( ( lineLength - sideLength ) / sideLength ) + 1);
100          return squares;
101      }
102  
103      private double chordLength(double yOffset, SCircle circle){
104          double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
105          double chordLength = xLength * 2;
106          return chordLength;
107      }
108  
109      private static int getNumber(String prompt) {
110          String nss = JOptionPane.showInputDialog(null,prompt+"?");
111          Scanner scanner = new Scanner(nss);
112          return scanner.nextInt();
113  
114      }
115  
116      private String getColor(String color_name) {
117          String nss = JOptionPane.showInputDialog(null, color_name+"?");
118          Scanner scanner = new Scanner(nss);
119          return scanner.next();
120      }
121  
122      public SimpleDots() {
123          paintTheImage();
124      }
125  
126      public static void main(String[] args) {
127          SwingUtilities.invokeLater(new Runnable() {
128              public void run() {
129                  new SimpleDots();
130              }
131          });
132      }
133  }