1 package npw; 2 3 import painter.SPainter; 4 import shapes.SCircle; 5 import shapes.SSquare; 6 7 import javax.swing.*; 8 import java.awt.*; 9 import java.util.Random; 10 import java.util.Scanner; 11 12 public class HirstSquares { 13 14 private void paintTheImage(){ 15 // Get the input information 16 int radius = getNumber("circle radius"); 17 int side = getNumber("square side length"); 18 19 // Establish the painter 20 SPainter painter = new SPainter("Circle of Squares", radius*2+50, radius*2+50); 21 painter.setBrushWidth(3); 22 SCircle circle = new SCircle(radius); 23 SSquare square = new SSquare(side); 24 25 // Paint the squares 26 paintCircleOfSquares(painter, circle, square); 27 } 28 29 private void paintCircleOfSquares(SPainter painter, SCircle circle, SSquare square){ 30 // Position the painter to begin drawing the rows 31 painter.mfd(circle.radius()); 32 painter.tr(); 33 // Paint the circle of squares 34 double moved = 0; 35 while (moved < circle.diameter()) { 36 double chord = chordLength(circle.radius() - moved, circle); 37 int squares = squaresOnLineCount(chord, square.side()); 38 paintRow(painter, square, squares); 39 nextRow(painter, square.side()); 40 moved = moved + square.side(); 41 } 42 // Make the method invariant with respect to painter position 43 painter.tl(); 44 painter.mfd(circle.radius()); 45 } 46 47 // Move to the next row 48 private void nextRow(SPainter painter, double rowHeight){ 49 painter.tr(); 50 painter.mfd(rowHeight); 51 painter.tl(); 52 } 53 54 // Assumes the painter is at the center of the row to paint, facing right. 55 private void paintRow(SPainter painter, SSquare square, int squaresToPaint){ 56 // Move backward 1/2 of the length we're painting to get ready to paint the row. 57 double centerOffset = ( (squaresToPaint * square.side()) / 2) - square.side()/2; 58 painter.mbk(centerOffset); 59 60 // Paint the row of squares. 61 int painted = 0; 62 while (painted < squaresToPaint){ 63 paintOneSquare(painter, square); 64 painter.mfd(square.side()); 65 painted = painted + 1; 66 } 67 68 // Make the method invariant with respect to painter position. 69 painter.mbk(centerOffset + square.side()); 70 } 71 72 private void paintOneSquare(SPainter painter, SSquare square){ 73 painter.setColor(randomColor()); 74 square.s2(); 75 painter.paint(square); 76 painter.setColor(Color.BLACK); 77 painter.draw(square); 78 square.x2(); 79 80 81 82 } 83 84 private static int squaresOnLineCount(double lineLength, double sideLength){ 85 int squares = ( (int)Math.ceil( ( lineLength - sideLength ) / sideLength ) + 1); 86 return squares; 87 } 88 89 private double chordLength(double yOffset, SCircle circle){ 90 double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2)); 91 double chordLength = xLength * 2; 92 return chordLength; 93 } 94 95 private static int getNumber(String prompt) { 96 String nss = JOptionPane.showInputDialog(null,prompt+"?"); 97 Scanner scanner = new Scanner(nss); 98 return scanner.nextInt(); 99 } 100 101 private static Color randomColor() { 102 Random rgen = new Random(); 103 int r = rgen.nextInt(256); 104 int g = rgen.nextInt(256); 105 int b = rgen.nextInt(256); 106 return new Color(r,g,b); 107 } 108 109 public HirstSquares() { 110 paintTheImage(); 111 } 112 113 public static void main(String[] args) { 114 SwingUtilities.invokeLater(new Runnable() { 115 public void run() { 116 new HirstSquares(); 117 } 118 }); 119 } 120 }