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228 lines
6.7 KiB
228 lines
6.7 KiB
// Domain visualization graph for YaCy
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// by Michael Christen
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//
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// this applet uses code and the physics engine from
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// http://www.cs.princeton.edu/~traer/physics/
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// from Jeffrey Traer Bernstein
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// redistribution is granted according to forum posting in
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// http://processing.org/discourse/yabb_beta/YaBB.cgi?board=os_libraries_tools;action=display;num=1139193613
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import traer.physics.*;
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import traer.animation.*;
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import processing.net.*;
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final float NODE_SIZE = 6;
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final float EDGE_LENGTH = 50;
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final float EDGE_STRENGTH = 0.01;
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final float SPACER_STRENGTH = 10;
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ParticleSystem physics;
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Smoother3D centroid;
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PFont font;
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Client myClient;
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Particle center0, center1; // two gravity centers to support object ordering for non-quadratic fields
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String parsingHostName = "";
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String parsingHostID = "";
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HashMap nodes = new HashMap(); // map that holds host objects
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void setup() {
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String[] fontList = PFont.list();
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//println(fontList);
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font = createFont(fontList[0], 32); //just take any, should be mostly Arial
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textFont(font, 12);
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size(660, 400);
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smooth();
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frameRate( 24 );
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strokeWeight( 2 );
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ellipseMode( CENTER );
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physics = new ParticleSystem( 0, 0.25 );
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centroid = new Smoother3D( 0.8 );
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initializePhysics();
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initRequest();
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}
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void initRequest() {
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myClient = new Client(this, "localhost", 8080);
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myClient.write("GET /xml/webstructure.xml HTTP/1.1\n");
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myClient.write("Host: localhost\n\n");
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}
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void processRequestResponse() {
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if (myClient.available() > 0) {
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String line = myClient.readStringUntil((byte) 10);
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//println("Line: " + line);
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if (line == null) line = ""; else line = line.trim();
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if (line.startsWith("<domain")) processDomain(parseProps(line.substring(7, line.length() - 1).trim()));
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if (line.startsWith("<citation")) processCitation(parseProps(line.substring(9, line.length() - 2).trim()));
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}
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}
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HashMap parseProps(String s) {
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String[] l = s.split(" ");
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HashMap map = new HashMap();
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int p;
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String z;
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for (int i = 0; i < l.length; i++) {
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p = l[i].indexOf("=");
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if (p > 0) {
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z = l[i].substring(p + 1).trim();
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if (z.charAt(0) == '"') z = z.substring(1);
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if (z.charAt(z.length() - 1) == '"') z = z.substring(0, z.length() - 1);
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map.put(l[i].substring(0, p), z);
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}
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}
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return map;
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}
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void processDomain(HashMap props) {
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//println("Domain: " + props.toString());
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parsingHostName = (String) props.get("host"); if (parsingHostName == null) parsingHostName = "";
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parsingHostID = (String) props.get("id"); if (parsingHostID == null) parsingHostID = "";
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host h = new host(parsingHostName, physics.makeParticle(1.0, random(0, EDGE_LENGTH * 30), random(- EDGE_LENGTH * 2, EDGE_LENGTH * 2), 0));
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nodes.put(parsingHostID, h);
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addAttraction(h.node);
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}
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void processCitation(HashMap props) {
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//println("Citation: " + props.toString());
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String host = (String) props.get("host"); if (host == null) host = "";
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String id = (String) props.get("id"); if (id == null) id = "";
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int count = 0;
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try {
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String counts = (String) props.get("count"); if (counts != null) count = Integer.parseInt(counts);
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} catch (NumberFormatException e) {}
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// find the two nodes that have a relation
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host h = (host) nodes.get(id);
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if (h == null) return; // host is not known TODO: store these and create relation later
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host p = (host) nodes.get(parsingHostID); // this should be successful
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addRelation(h.node, p.node);
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}
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void draw() {
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processRequestResponse();
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physics.tick( 1.0 );
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if (physics.numberOfParticles() > 1) updateCentroid();
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centroid.tick();
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background( 0 );
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translate( width/2 , height/2 );
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scale( centroid.z() );
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translate( -centroid.x(), -centroid.y() );
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drawNetwork();
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}
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void drawNetwork() {
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fill( 100, 255, 100 );
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// draw vertices
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noStroke();
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String name;
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Iterator j = nodes.values().iterator();
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host h;
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while (j.hasNext()) {
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h = (host) j.next();
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Particle v = h.node;
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ellipse(v.position().x(), v.position().y(), NODE_SIZE, NODE_SIZE);
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name = h.name;
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text(name, v.position().x() - (name.length() * 26 / 10), v.position().y() + 14);
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}
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// draw center
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/*
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ellipse( center0.position().x(), center0.position().y(), NODE_SIZE * 2, NODE_SIZE * 2 );
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name = "Center0";
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text(name, center0.position().x() - (name.length() * 26 / 10), center0.position().y() + 14);
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ellipse( center1.position().x(), center1.position().y(), NODE_SIZE * 2, NODE_SIZE * 2 );
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name = "Center1";
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text(name, center1.position().x() - (name.length() * 26 / 10), center1.position().y() + 14);
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*/
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// draw edges
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stroke( 160 );
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beginShape( LINES );
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for ( int i = 0; i < physics.numberOfSprings(); ++i ) {
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Spring e = physics.getSpring( i );
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Particle a = e.getOneEnd();
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Particle b = e.getTheOtherEnd();
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vertex( a.position().x(), a.position().y() );
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vertex( b.position().x(), b.position().y() );
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}
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endShape();
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}
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void keyPressed() {
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if ( key == 'c' ) {
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initializePhysics();
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return;
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}
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if ( key == ' ' ) {
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Particle p = physics.makeParticle();
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addRelation(p, physics.getParticle( (int) random( 0, physics.numberOfParticles()-1) ));
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addAttraction(p);
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return;
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}
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}
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void updateCentroid() {
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float
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xMax = Float.NEGATIVE_INFINITY,
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xMin = Float.POSITIVE_INFINITY,
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yMin = Float.POSITIVE_INFINITY,
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yMax = Float.NEGATIVE_INFINITY;
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for ( int i = 0; i < physics.numberOfParticles(); ++i ) {
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Particle p = physics.getParticle( i );
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xMax = max( xMax, p.position().x() );
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xMin = min( xMin, p.position().x() );
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yMin = min( yMin, p.position().y() );
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yMax = max( yMax, p.position().y() );
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}
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float deltaX = xMax-xMin;
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float deltaY = yMax-yMin;
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if ( deltaY > deltaX )
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centroid.setTarget( xMin + 0.5*deltaX, yMin +0.5*deltaY, height/(deltaY+50) );
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else
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centroid.setTarget( xMin + 0.5*deltaX, yMin +0.5*deltaY, width/(deltaX+50) );
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}
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void initializePhysics() {
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physics.clear();
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center0 = physics.makeParticle(1.0, 0, 0, 0);
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center0.makeFixed();
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center1 = physics.makeParticle(1.0, EDGE_LENGTH * 30, 0, 0);
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center1.makeFixed();
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centroid.setValue( 0, 0, 1.0 );
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}
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void addAttraction(Particle p) {
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physics.makeAttraction(center0, p, 5000.0, 3 * EDGE_LENGTH);
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physics.makeAttraction(center1, p, 5000.0, 3 * EDGE_LENGTH);
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// spacers
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for ( int i = 0; i < physics.numberOfParticles(); ++i ) {
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Particle q = physics.getParticle( i );
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if (p != q) physics.makeAttraction( p, q, -SPACER_STRENGTH, 20);
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}
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}
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void addRelation(Particle p, Particle other) {
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physics.makeSpring( p, other, EDGE_STRENGTH, EDGE_STRENGTH, EDGE_LENGTH );
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//p.moveTo( q.position().x() + random( -1, 1 ), q.position().y() + random( -1, 1 ), 0 );
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}
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static class host {
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String name;
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Particle node;
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public host(String name, Particle node) {
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this.name = name;
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this.node = node;
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}
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}
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