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Add example to list in README, clean file format, refs #350 
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‎README.md‎

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@@ -129,6 +129,7 @@ Below are the very pretty basic examples demonstrating of how Webcam Capture API
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* [How to save captured image in PNG / JPG / GIF / BMP etc](https://github.com/sarxos/webcam-capture/blob/master/webcam-capture/src/example/java/DifferentFileFormatsExample.java)
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* [How to capture with many parallel threads](https://github.com/sarxos/webcam-capture/blob/master/webcam-capture/src/example/java/ConcurrentThreadsExample.java)
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* [How to detect motion (text mode only)](https://github.com/sarxos/webcam-capture/blob/master/webcam-capture/src/example/java/DetectMotionExample.java)
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* [How to perform multipoint motion detection](https://github.com/sarxos/webcam-capture/blob/master/webcam-capture/src/example/java/MultipointMotionDetectionExample.java)
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* [How to display images from multiple IP cameras exposing pictures in JPG format](https://github.com/sarxos/webcam-capture/blob/master/webcam-capture-drivers/driver-ipcam/src/examples/java/JpegDasdingStudioExample.java)
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* [How to display image from IP camera exposing MJPEG stream](https://github.com/sarxos/webcam-capture/blob/master/webcam-capture-drivers/driver-ipcam/src/examples/java/MjpegLignanoBeachExample.java)
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* [How to use composite driver to display both, build-in and IP camera images](https://github.com/sarxos/webcam-capture/blob/master/webcam-capture-drivers/driver-ipcam/src/examples/java/DualNativeAndMjpegWebcamExample.java)

‎webcam-capture/src/example/java/MultipointMotionDetectionExample.java‎

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package com.github.sarxos.webcam;
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import javax.swing.*;
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import java.awt.*;
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import java.awt.BasicStroke;
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import java.awt.Color;
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import java.awt.Graphics2D;
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import java.awt.Point;
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import java.awt.Rectangle;
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import java.awt.Stroke;
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import java.awt.image.BufferedImage;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.Map;
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public class MultipointMotionDetectionExample implements WebcamMotionListener, WebcamPanel.Painter {
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public static void main(String[] args) throws InterruptedException {
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new MultipointMotionDetectionExample();
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}
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private static final int INTERVAL = 100; // ms
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public static Webcam webcam;
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public static WebcamPanel.Painter painter = null;
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public MultipointMotionDetectionExample(){
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webcam = Webcam.getDefault();
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webcam.setViewSize(WebcamResolution.VGA.getSize());
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WebcamPanel panel = new WebcamPanel(webcam);
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panel.setPreferredSize(WebcamResolution.VGA.getSize());
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panel.setPainter(this);
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panel.setFPSDisplayed(true);
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panel.setFPSLimited(true);
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panel.setFPSLimit(20);
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panel.setPainter(this);
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panel.start();
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painter = panel.getDefaultPainter();
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import javax.swing.JFrame;
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JFrame window = new JFrame("Multipoint-motion detection");
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window.add(panel);
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window.setResizable(true);
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window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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window.pack();
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window.setVisible(true);
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import com.github.sarxos.webcam.Webcam;
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import com.github.sarxos.webcam.WebcamMotionDetector;
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import com.github.sarxos.webcam.WebcamMotionEvent;
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import com.github.sarxos.webcam.WebcamMotionListener;
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import com.github.sarxos.webcam.WebcamPanel;
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import com.github.sarxos.webcam.WebcamResolution;
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WebcamMotionDetector detector = new WebcamMotionDetector(webcam);
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//Sets the max amount of motion points to 300 and the minimum range between them to 40
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detector.setMaxMotionPoints(300);
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detector.setPointRange(40);
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detector.setInterval(INTERVAL);
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detector.addMotionListener(this);
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detector.start();
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}
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//A HashMap to store all the current points and the current amount of times it has been rendered
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//Time rendered is used to remove the point after a certain amount of time
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public static HashMap<Point, Integer> motionPoints = new HashMap<Point, Integer>();
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//Gets the motion points from the motion detector and adds it to the HashMap
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@Override
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public void motionDetected(WebcamMotionEvent wme) {
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for(Point p : wme.getPoints()){
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motionPoints.put(p, 0);
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}
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}
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/**
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* This is example demonstrating how to use multipoint motion detection feature.
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*
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* @author tm1990 (https://github.com/tm1990)
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*/
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public class MultipointMotionDetectionExample implements WebcamMotionListener, WebcamPanel.Painter {
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@Override
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public void paintPanel(WebcamPanel panel, Graphics2D g2) {
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if (painter != null) {
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painter.paintPanel(panel, g2);
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}
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}
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public static void main(String[] args) throws InterruptedException {
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new MultipointMotionDetectionExample();
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}
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private static final int INTERVAL = 100; // ms
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public static Webcam webcam;
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public static WebcamPanel.Painter painter = null;
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//Used to render the effect for the motion points
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private static final Stroke STROKE = new BasicStroke(1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 1.0f, new float[] { 1.0f }, 0.0f);
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public MultipointMotionDetectionExample() {
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webcam = Webcam.getDefault();
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webcam.setViewSize(WebcamResolution.VGA.getSize());
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//The amount of time each point should be rendered for before being removed
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public static final int renderTime = 3;
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WebcamPanel panel = new WebcamPanel(webcam);
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panel.setPreferredSize(WebcamResolution.VGA.getSize());
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panel.setPainter(this);
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panel.setFPSDisplayed(true);
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panel.setFPSLimited(true);
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panel.setFPSLimit(20);
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panel.setPainter(this);
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panel.start();
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//The actual size of the rendered effect for each point
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public static final int renderSize = 20;
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painter = panel.getDefaultPainter();
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@Override
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public void paintImage(WebcamPanel panel, BufferedImage image, Graphics2D g2) {
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JFrame window = new JFrame("Multipoint-motion detection");
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window.add(panel);
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window.setResizable(true);
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window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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window.pack();
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window.setVisible(true);
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WebcamMotionDetector detector = new WebcamMotionDetector(webcam);
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if (painter != null) {
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painter.paintImage(panel, image, g2);
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}
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// Sets the max amount of motion points to 300 and the minimum range between them to 40
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detector.setMaxMotionPoints(300);
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detector.setPointRange(40);
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//Gets all the points and updates the amount of time they have been rendered for
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//And removes the ones that exceed the renderTime variable
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detector.setInterval(INTERVAL);
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detector.addMotionListener(this);
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ArrayList<Point> rem = new ArrayList<Point>();
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detector.start();
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}
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for (Map.Entry<Point, Integer> ent : motionPoints.entrySet()) {
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Point p = ent.getKey();
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/**
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* A HashMap to store all the current points and the current amount of times it has been
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* rendered. Time rendered is used to remove the point after a certain amount of time.
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*/
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public static HashMap<Point, Integer> motionPoints = new HashMap<Point, Integer>();
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if (ent.getValue() != null) {
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int tt = ent.getValue();
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if (tt >= renderTime) {
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rem.add(ent.getKey());
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// Gets the motion points from the motion detector and adds it to the HashMap
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@Override
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public void motionDetected(WebcamMotionEvent wme) {
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for (Point p : wme.getPoints()) {
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motionPoints.put(p, 0);
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}
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}
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} else {
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int temp = ent.getValue() + 1;
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motionPoints.put(p, temp);
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}
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@Override
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public void paintPanel(WebcamPanel panel, Graphics2D g2) {
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if (painter != null) {
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painter.paintPanel(panel, g2);
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}
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}
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}
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}
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/**
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* Used to render the effect for the motion points.
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*/
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private static final Stroke STROKE = new BasicStroke(1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 1.0f, new float[] { 1.0f }, 0.0f);
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for(Point p : rem){
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motionPoints.remove(p);
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}
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/**
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* The amount of time each point should be rendered for before being removed.
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*/
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public static final int renderTime = 3;
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/**
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* The actual size of the rendered effect for each point.
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*/
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public static final int renderSize = 20;
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//Gets all the remaining points after removing the exceeded ones and then renders the current ones as a red square
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for(Map.Entry<Point, Integer> ent : motionPoints.entrySet()){
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Point p = ent.getKey();
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@Override
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public void paintImage(WebcamPanel panel, BufferedImage image, Graphics2D g2) {
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int xx = p.x - (renderSize / 2), yy = p.y - (renderSize / 2);
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if (painter != null) {
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painter.paintImage(panel, image, g2);
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}
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Rectangle bounds = new Rectangle(xx, yy, renderSize, renderSize);
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// Gets all the points and updates the amount of time they have been rendered for
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// And removes the ones that exceed the renderTime variable
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int dx = (int) (0.1 * bounds.width);
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int dy = (int) (0.2 * bounds.height);
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int x = (int) bounds.x - dx;
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int y = (int) bounds.y - dy;
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int w = (int) bounds.width + 2 * dx;
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int h = (int) bounds.height + dy;
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ArrayList<Point> rem = new ArrayList<Point>();
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g2.setStroke(STROKE);
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g2.setColor(Color.RED);
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g2.drawRect(x, y, w, h);
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for (Map.Entry<Point, Integer> ent : motionPoints.entrySet()) {
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Point p = ent.getKey();
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}
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if (ent.getValue() != null) {
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int tt = ent.getValue();
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if (tt >= renderTime) {
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rem.add(ent.getKey());
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}
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} else {
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int temp = ent.getValue() + 1;
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motionPoints.put(p, temp);
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}
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}
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}
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for (Point p : rem) {
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motionPoints.remove(p);
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}
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// Gets all the remaining points after removing the exceeded ones and then renders the
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// current ones as a red square
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for (Map.Entry<Point, Integer> ent : motionPoints.entrySet()) {
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Point p = ent.getKey();
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int xx = p.x - (renderSize / 2), yy = p.y - (renderSize / 2);
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Rectangle bounds = new Rectangle(xx, yy, renderSize, renderSize);
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int dx = (int) (0.1 * bounds.width);
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int dy = (int) (0.2 * bounds.height);
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int x = bounds.x - dx;
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int y = bounds.y - dy;
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int w = bounds.width + 2 * dx;
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int h = bounds.height + dy;
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g2.setStroke(STROKE);
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g2.setColor(Color.RED);
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g2.drawRect(x, y, w, h);
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}
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}
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}

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