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Chapter 03 completed codes added.
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‎03-Probability-Simulation/Chapter-03-Completed-Codes/Get-PI-with-Monte-Carlo/src/AlgoFrame.java

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import java.awt.*;
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import java.util.LinkedList;
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import javax.swing.*;
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public class AlgoFrame extends JFrame{
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private int canvasWidth;
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private int canvasHeight;
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public AlgoFrame(String title, int canvasWidth, int canvasHeight){
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super(title);
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this.canvasWidth = canvasWidth;
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this.canvasHeight = canvasHeight;
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AlgoCanvas canvas = new AlgoCanvas();
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setContentPane(canvas);
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pack();
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setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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setResizable(false);
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setVisible(true);
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}
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public AlgoFrame(String title){
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this(title, 1024, 768);
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}
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public int getCanvasWidth(){return canvasWidth;}
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public int getCanvasHeight(){return canvasHeight;}
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// data
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private MonteCarloPiData data;
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public void render(MonteCarloPiData data){
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this.data = data;
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repaint();
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}
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private class AlgoCanvas extends JPanel{
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public AlgoCanvas(){
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// 双缓存
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super(true);
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}
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@Override
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public void paintComponent(Graphics g) {
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super.paintComponent(g);
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Graphics2D g2d = (Graphics2D)g;
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// 抗锯齿
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RenderingHints hints = new RenderingHints(
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RenderingHints.KEY_ANTIALIASING,
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RenderingHints.VALUE_ANTIALIAS_ON);
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hints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
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g2d.addRenderingHints(hints);
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// 具体绘制
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AlgoVisHelper.setStrokeWidth(g2d, 3);
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AlgoVisHelper.setColor(g2d, AlgoVisHelper.Blue);
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Circle circle = data.getCircle();
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AlgoVisHelper.strokeCircle(g2d, circle.getX(), circle.getY(), circle.getR());
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for(int i = 0 ; i < data.getPointsNumber() ; i ++){
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Point p = data.getPoint(i);
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if(circle.contain(p))
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AlgoVisHelper.setColor(g2d, AlgoVisHelper.Red);
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else
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AlgoVisHelper.setColor(g2d, AlgoVisHelper.Green);
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AlgoVisHelper.fillCircle(g2d, p.x, p.y, 3);
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}
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}
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@Override
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public Dimension getPreferredSize(){
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return new Dimension(canvasWidth, canvasHeight);
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}
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}
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}

‎03-Probability-Simulation/Chapter-03-Completed-Codes/Get-PI-with-Monte-Carlo/src/AlgoVisHelper.java

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import javax.swing.*;
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import java.awt.*;
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import java.awt.geom.Ellipse2D;
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import java.awt.geom.GeneralPath;
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import java.awt.geom.Line2D;
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import java.awt.geom.Rectangle2D;
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import java.lang.InterruptedException;
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public class AlgoVisHelper {
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private AlgoVisHelper(){}
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public static final Color Red = new Color(0xF44336);
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public static final Color Pink = new Color(0xE91E63);
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public static final Color Purple = new Color(0x9C27B0);
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public static final Color DeepPurple = new Color(0x673AB7);
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public static final Color Indigo = new Color(0x3F51B5);
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public static final Color Blue = new Color(0x2196F3);
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public static final Color LightBlue = new Color(0x03A9F4);
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public static final Color Cyan = new Color(0x00BCD4);
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public static final Color Teal = new Color(0x009688);
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public static final Color Green = new Color(0x4CAF50);
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public static final Color LightGreen = new Color(0x8BC34A);
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public static final Color Lime = new Color(0xCDDC39);
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public static final Color Yellow = new Color(0xFFEB3B);
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public static final Color Amber = new Color(0xFFC107);
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public static final Color Orange = new Color(0xFF9800);
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public static final Color DeepOrange = new Color(0xFF5722);
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public static final Color Brown = new Color(0x795548);
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public static final Color Grey = new Color(0x9E9E9E);
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public static final Color BlueGrey = new Color(0x607D8B);
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public static final Color Black = new Color(0x000000);
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public static final Color White = new Color(0xFFFFFF);
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public static void strokeCircle(Graphics2D g, int x, int y, int r){
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Ellipse2D circle = new Ellipse2D.Double(x-r, y-r, 2*r, 2*r);
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g.draw(circle);
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}
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public static void fillCircle(Graphics2D g, int x, int y, int r){
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Ellipse2D circle = new Ellipse2D.Double(x-r, y-r, 2*r, 2*r);
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g.fill(circle);
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}
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public static void strokeRectangle(Graphics2D g, int x, int y, int w, int h){
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Rectangle2D rectangle = new Rectangle2D.Double(x, y, w, h);
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g.draw(rectangle);
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}
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public static void fillRectangle(Graphics2D g, int x, int y, int w, int h){
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Rectangle2D rectangle = new Rectangle2D.Double(x, y, w, h);
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g.fill(rectangle);
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}
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public static void setColor(Graphics2D g, Color color){
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g.setColor(color);
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}
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public static void setStrokeWidth(Graphics2D g, int w){
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int strokeWidth = w;
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g.setStroke(new BasicStroke(strokeWidth, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND));
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}
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public static void pause(int t) {
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try {
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Thread.sleep(t);
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}
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catch (InterruptedException e) {
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System.out.println("Error sleeping");
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}
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}
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public static void putImage(Graphics2D g, int x, int y, String imageURL){
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ImageIcon icon = new ImageIcon(imageURL);
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Image image = icon.getImage();
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g.drawImage(image, x, y, null);
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}
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public static void drawText(Graphics2D g, String text, int centerx, int centery){
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if(text == null)
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throw new IllegalArgumentException("Text is null in drawText function!");
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FontMetrics metrics = g.getFontMetrics();
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int w = metrics.stringWidth(text);
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int h = metrics.getDescent();
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g.drawString(text, centerx - w/2, centery + h);
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}
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}

‎03-Probability-Simulation/Chapter-03-Completed-Codes/Get-PI-with-Monte-Carlo/src/AlgoVisualizer.java

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import java.awt.*;
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import java.util.LinkedList;
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import javax.swing.*;
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public class AlgoVisualizer {
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private static int DELAY = 40;
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private MonteCarloPiData data;
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private AlgoFrame frame;
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private int N;
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public AlgoVisualizer(int sceneWidth, int sceneHeight, int N){
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if(sceneWidth != sceneHeight)
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throw new IllegalArgumentException("This demo must be run in a square window!");
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this.N = N;
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Circle circle = new Circle(sceneWidth/2, sceneHeight/2, sceneWidth/2);
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data = new MonteCarloPiData(circle);
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// 初始化视图
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EventQueue.invokeLater(() -> {
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frame = new AlgoFrame("Monte Carlo", sceneWidth, sceneHeight);
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new Thread(() -> {
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run();
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}).start();
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});
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}
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public void run(){
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for(int i = 0 ; i < N ; i ++){
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if( i % 100 == 0) {
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frame.render(data);
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AlgoVisHelper.pause(DELAY);
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System.out.println(data.estimatePi());
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}
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int x = (int)(Math.random() * frame.getCanvasWidth());
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int y = (int)(Math.random() * frame.getCanvasHeight());
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data.addPoint(new Point(x, y));
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}
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}
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public static void main(String[] args) {
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int sceneWidth = 800;
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int sceneHeight = 800;
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int N = 20000;
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AlgoVisualizer vis = new AlgoVisualizer(sceneWidth, sceneHeight, N);
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}
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}

‎03-Probability-Simulation/Chapter-03-Completed-Codes/Get-PI-with-Monte-Carlo/src/Circle.java

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import java.awt.*;
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import javax.swing.*;
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public class Circle {
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private int x, y, r;
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public Circle(int x, int y, int r){
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this.x = x;
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this.y = y;
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this.r = r;
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}
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public int getX(){ return x; }
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public int getY(){ return y; }
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public int getR(){ return r; }
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public boolean contain(Point p){
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return Math.pow(p.x - x, 2) + Math.pow(p.y - y, 2) <= r*r;
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}
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}

‎03-Probability-Simulation/Chapter-03-Completed-Codes/Get-PI-with-Monte-Carlo/src/MonteCarloPiData.java

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import java.util.LinkedList;
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import java.awt.*;
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public class MonteCarloPiData {
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private Circle circle;
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private LinkedList<Point> points;
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private int insideCircle = 0;
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public MonteCarloPiData(Circle circle){
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this.circle = circle;
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points = new LinkedList<Point>();
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}
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public Circle getCircle(){
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return circle;
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}
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public int getPointsNumber(){
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return points.size();
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}
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public Point getPoint(int i){
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if(i < 0 || i >= points.size())
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throw new IllegalArgumentException("out of bound in getPoint!");
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return points.get(i);
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}
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public void addPoint(Point p){
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points.add(p);
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if(circle.contain(p))
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insideCircle ++;
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}
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public double estimatePi(){
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if(points.size() == 0)
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return 0.0;
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int circleArea = insideCircle;
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int squareArea = points.size();
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return (double)circleArea * 4 / squareArea;
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}
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}

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