1    /* 
2     * Assignment 4 Program 5: Hirst Circles in a Circle. 
3     * A program to paint, centered on the canvas, a circle of smaller circles with simple color and Hirst 
4     */
5    
6    package npw;
7    
8    import painter.SPainter;
9    import shapes.SCircle;
10   import shapes.SSquare;
11   
12   import javax.swing.*;
13   import java.awt.*;
14   import java.util.Random;
15   import java.util.Scanner;
16   
17   
18   public class SimpleDots {
19       public static void main(String[] args){
20           SwingUtilities.invokeLater(new Runnable() {
21               public void run() {
22                   new SimpleDots();
23               }
24           });
25       }
26       public SimpleDots() {
27           paintTheImage();
28       }
29   
30       private void paintTheImage() {
31           // Get the input information
32           // create new method named "getNumber" to scan from input
33           int radius = getNumber("circle radius");
34           int side = getNumber("square side length");
35           String color = getColor ("Color Name");
36   
37           // Establish the painter
38           // Create new painter with Canvas names "Circle of Squares" and side of Circle diameter plus 50
39           SPainter painter = new SPainter("Circle of Squares", radius*2+50, radius*2+50);
40           // Painter's brushWidth widen so that the side of the square could be more visible
41           painter.setBrushWidth(3);
42           SCircle circle = new SCircle(radius);
43           SSquare square = new SSquare(side);
44   
45           // Paint the squares
46           // Created new method named "paintCircleOfSquares" with parameter of painter,circle,and square
47           paintCircleOfSquares(painter, circle, square,color);
48       }
49   
50       private static String getColor(String prompt) {
51           String nss = JOptionPane.showInputDialog(null,prompt+"?");
52           Scanner scanner = new Scanner(nss);
53           return scanner.next();
54       }
55   
56       private void paintCircleOfSquares(SPainter painter, SCircle circle, SSquare square, String color) {
57           // Position the painter to begin drawing the rows
58           painter.mfd(circle.radius()); // painter move forward as circle radius
59           painter.tr();
60           // Paint the circle of squares
61           double moved = 0;
62           while (moved < circle.diameter()){
63               double chord = chordLength(circle.radius()-moved,circle);
64               // number of square on the chord line so that the painter can know how many square to paint on a line
65               int squares = squaresOnLineCount(chord,square.side());
66               paintRow(painter, square, squares, color);
67               nextRow(painter, square.side());
68               moved = moved+square.side();
69           }
70           // Make the method invariant with respect to painter position
71           painter.tl();
72           painter.mfd(circle.radius());
73       }
74   
75       // Assumes the painter is at the center of the row to paint, facing right.
76       private void paintRow(SPainter painter, SSquare square, int squaresToPaint, String color) {
77           double centerOffset= ((squaresToPaint*square.side())/2)- square.side()/2;
78           painter.mbk(centerOffset);
79   
80   
81           // Paint the row of squares
82           int painted = 0;
83           while (painted < squaresToPaint){
84               paintOneSquare(painter,square,color);
85               painter.mfd(square.side());
86               painted = painted + 1;
87           }
88   
89           // Make the method invariant with respect to painter position.
90           painter.mbk(centerOffset + square.side());
91       }
92   
93       private void paintOneSquare(SPainter painter, SSquare square, String color) {
94           square.s2();
95           SCircle circle = square.inscribingCircle();
96           if (color.equalsIgnoreCase("red")) {
97               painter.setColor(Color.RED);
98               painter.paint(circle);
99           } else if (color.equalsIgnoreCase("blue")) {
100              painter.setColor(Color.BLUE);
101              painter.paint(circle);
102          } else if (color.equalsIgnoreCase("green")) {
103              painter.setColor(Color.GREEN);
104              painter.paint(circle);
105          } else {
106              painter.setColor(Color.BLACK);
107              painter.paint(circle);
108          }
109          square.x2();
110      }
111  
112      // Move to next row
113      private void nextRow(SPainter painter, double rowHeight) {
114          painter.tr();
115          painter.mfd(rowHeight);
116          painter.tl();
117      }
118  
119      // LineLength is the Chord Length, side Length is length of the square
120      private static int squaresOnLineCount(double lineLength,double sideLength) {
121          //Math.ceil return the smallest integer that is greater or equal to the input.
122          int squares = ((int)Math.ceil((lineLength-sideLength)/sideLength)+1);
123          return squares;
124      }
125  
126      private double chordLength(double yOffset, SCircle circle) {
127          double xLength = Math.sqrt(Math.pow(circle.radius(),2)-Math.pow(yOffset,2));
128          double chordLength = xLength * 2;
129          // chord length = 2 * Square root of (r2 * d*)
130          return chordLength;
131      }
132  
133      private static int getNumber(String prompt) {
134          // The input from the Input Dialog is a string so need to scanner to make sure it's a int.
135          String nss = JOptionPane.showInputDialog(null,prompt+"?");
136          Scanner scanner = new Scanner(nss);
137          return scanner.nextInt();
138      }
139  }
140