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 HirstDots {
16   
17       private void paintTheImage(){
18           // Get the input information
19           int radius = getNumber("circle radius");
20           int diameter = getNumber("Circle Diameter");
21           double radius2= diameter/2;
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           SCircle circles= new SCircle(radius2);
28   
29           // Paint the squares
30           paintCircleOfSquares(painter, circle, circles);
31       }
32   
33       private void paintCircleOfSquares(SPainter painter, SCircle circle, SCircle circles){
34           // Position the painter to begin drawing the rows
35           painter.mfd(circle.radius());
36           painter.tr();
37           // Paint the circle of squares
38           double moved = 0;
39           while (moved < circle.diameter()) {
40               double chord = chordLength(circle.radius() - moved, circle);
41               System.out.println(chord);
42               int lineCircle = circleOnLineCount(chord, circles.diameter());
43               System.out.println(lineCircle);
44               paintRow(painter, circles, lineCircle);
45               nextRow(painter, circles.diameter());
46               moved = moved + circles.diameter();
47           }
48           // Make the method invariant with respect to painter position
49           painter.tl();
50           painter.mfd(circle.radius());
51       }
52   
53       // Move to the next row
54       private void nextRow(SPainter painter, double rowHeight){
55           painter.tr();
56           painter.mfd(rowHeight);
57           painter.tl();
58       }
59   
60       // Assumes the painter is at the center of the row to paint, facing right.
61       private void paintRow(SPainter painter, SCircle circles, int circleToPaint){
62           // Move backward 1/2 of the length we're painting to get ready to paint the row.
63           double centerOffset = ( (circleToPaint * circles.diameter() / 2) - circles.diameter()/2);
64           painter.mbk(centerOffset);
65   
66           // Paint the row of squares.
67           int painted = 0;
68           while (painted < circleToPaint){
69               paintOneCircle(painter,circles);
70               painter.mfd(circles.diameter());
71               painted = painted + 1;
72           }
73   
74           // Make the method invariant with respect to painter position.
75           painter.mbk(centerOffset + circles.diameter());
76       }
77   
78       private void paintOneCircle(SPainter painter, SCircle circles){
79           painter.setColor(randomColor());
80           circles.s3();
81           painter.paint(circles);
82           circles.x3();
83   
84       }
85   
86       private static int circleOnLineCount(double lineLength, double sideLength){
87           System.out.println(lineLength + " " + sideLength);
88           int circles = ( (int)Math.ceil( ( lineLength - sideLength ) / sideLength ) + 1);
89           return circles;
90       }
91   
92       private double chordLength(double yOffset, SCircle circle){
93           double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
94           double chordLength = xLength * 2;
95           return chordLength;
96       }
97   
98       private static int getNumber(String prompt) {
99           String nss = JOptionPane.showInputDialog(null,prompt+"?");
100          Scanner scanner = new Scanner(nss);
101          return scanner.nextInt();
102      }
103  
104      private static Color randomColor() {
105          Random rgen = new Random();
106          int r = rgen.nextInt(256);
107          int g = rgen.nextInt(256);
108          int b = rgen.nextInt(256);
109          return new Color(r,g,b);
110      }
111  
112      public HirstDots() {
113          paintTheImage();
114      }
115  
116      public static void main(String[] args) {
117          SwingUtilities.invokeLater(new Runnable() {
118              public void run() {
119                  new HirstDots();
120              }
121          });
122      }
123  }
124