/* *A program to paint, centered on the canvas, a circle of randomly colored, black-framed squares. */ package npw; import painter.SPainter; import shapes.SCircle; import shapes.SSquare; import javax.swing.*; import java.awt.*; import java.util.Random; import java.util.Scanner; public class CircleOfSquares { private void paintTheImage(){ //Get the input info int radius=getNumber("circle radius"); int side=getNumber("square side length"); //Establish the painter SPainter painter=new SPainter("Circle of Squares", radius*2+50, radius*2+50); painter.setBrushWidth(3); SCircle circle=new SCircle(radius); SSquare square=new SSquare(side); //Paint the squares paintCircleOfSquares(painter,circle,square); } private static int getNumber(String prompt) { String nss=JOptionPane.showInputDialog(null,prompt+"?"); Scanner scanner=new Scanner(nss); return scanner.nextInt(); } private void paintCircleOfSquares(SPainter painter, SCircle circle, SSquare square) { //Position the painter to begin the rows painter.mfd(circle.radius()); painter.tr(); //Paint the circle of squares double moved=0; while (moved<circle.diameter()){ double chord=chordLength(circle.radius()-moved,circle); int squares=squaresOnLineCount(chord, square.side()); paintRow(painter, square, squares); nextRow(painter,square.side()); moved=moved+square.side(); } //Make the method invariant with respect to painter position painter.tl(); painter.mfd(circle.radius()); } private double chordLength(double yOffset, SCircle circle) { double xLength=Math.sqrt(Math.pow(circle.radius(), 2)-Math.pow(yOffset,2)); double chordLength=xLength*2; return chordLength; } private int squaresOnLineCount(double lineLength, double sideLength) { int squares=((int)Math.ceil((lineLength-sideLength)/sideLength)+1); return squares; } //Assumes the painter is at the center of the row to paint, facing right. private void paintRow(SPainter painter, SSquare square, int squaresToPaint) { //Move backward 1/2 the length we're painting to get ready to paint the row double centerOffset=((squaresToPaint*square.side())/2)-square.side()/2; painter.mbk(centerOffset); //Paint the row of squares int painted=0; while (painted<squaresToPaint){ paintOneSquare(painter,square); painter.mfd(square.side()); painted=painted+1; } //Make the method invariant with respect to the painter position painter.mbk((centerOffset+square.side())); } private void paintOneSquare(SPainter painter, SSquare square) { painter.setColor(randomColor()); painter.paint(square); painter.setColor(Color.BLACK); painter.draw(square); } private static Color randomColor() { Random rgen=new Random(); int r=rgen.nextInt(256); int g =rgen.nextInt(256); int b=rgen.nextInt(256); return new Color(r,g,b); } private void nextRow(SPainter painter, double rowHeight) { painter.tr(); painter.mfd(rowHeight); painter.tl(); } public CircleOfSquares() {paintTheImage();} public static void main(String[] args){ SwingUtilities.invokeLater(new Runnable() { public void run() {new CircleOfSquares();} }); } }