hi,
a small question .
how do i make a ball move along the lines that connect the dots?

1. public class Ball {
2.   private PVector location=new PVector();
3.  
4.  
5.   private PVector [] points;
6.   int step;
7.   int increment;
8.   public Ball(PVector[] points) {
9.    
10.     this.points = points;
11.     location=points[0].get();
12.     step=0;
13.     increment=1;
14.   }
15.   public void setLocation(PVector loc) {
16.     location=loc;
17.   }
18.   public PVector getLocation() {
19.     return this.location;
20.   }
21.   public void move () {
22.     location.x = lerp(location.x, this.points[step].x, .11f);
23.     location.y = lerp(location.y, this.points[step].y, .11f);
24.     if (step <= 0) {
25.       increment=abs(increment);
26.     }
27.     else if (step >= this.points.length-1) {
28.       increment = -abs(increment);
29.     }
30.  
    
31.     location.set(points[step].x, points[step].y, 0);
32.     pushStyle();
33.     fill(0);
34.     noStroke();
35.     ellipse(location.x, location.y, 10, 10);
36.     popStyle();
37.     step+=increment;
38.   }
39. }
40. private PVector [] points;
41. Ball ball;
42. public void setup() {
43.   size(800, 700);
44.   textSize(12);
45.   points=new PVector[10];
46.   randomSeed(233);
47.   for (int i=0; i<points.length; i++)
48.     points[i]=new PVector((int)random(0, width), (int)random(0, height));
49.          
50.   ball=new Ball( points);
51. }
52. public void draw() {
53.   background(255);
54.   smooth();
55.   frameRate(3);
56.  // pushStyle();
57.   noStroke();
58.   fill(255, 0, 0);
59.   for (int i=0; i<points.length; i++) {
60.     ellipse(points[i].x, points[i].y, 20, 20);
61.   }
62.  // popStyle();
63. stroke(1);
64.   for (int i=1; i<points.length; i++) {
65.     line(points[i-1].x, points[i-1].y, points[i].x, points[i].y);
66.   }
67.   ball.move();
68. }

hi,

i have a PVector array and i want to find collinear points by using the Comparator interface. In detail, i want to find their slopes and then sort the array by their slopes

i can sort the array by its x or y values but i cannot sort it by a relationship between point A and Point B. I have a class that uses a PVector internally

1. public class P {
2.    
3.  
4.     private PVector  point;
5.     public final Comparator <P>BY_SLOPE_ORDER=new BySlope();
6.     PApplet pa;
7.   
8.    private  float x,y;   
9.     public P(){
10.         point=new PVector();
11.        
12.     }
13.     public P(PApplet pa,PVector p){
14.         this.pa=pa;
15.         this.x=p.get().x/60+this.pa.getWidth()/4;
16.         this.y=p.get().y/60;
17.         point=new PVector(this.x,this.y);
18.     }
19.    
20.     public float getX(){
21.         return point.x;
22.     }
23.    
24.     public float getY(){
25.         return point.y;
26.     }
27.    
28.  public double slopeTo(P that){
29.         double a=1;
30.         double pos=(a-a)/a;//horizontal lines
31.         double neg=(a-a)/-a;//vertical lines
32.         double y=this.getY()-that.getY();
33.         double x=this.getX()-that.getX();
34.          slope=y/x;
35.         if (y==0)
36.             slope=pos;
37.         if (x==0)
38.             slope=Double.POSITIVE_INFINITY;
39.         if (y==0 && x==0)
40.             slope=Double.NEGATIVE_INFINITY;
41.         return slope;
42.     }
43. //to double check afterwards
    
44. public  boolean collinear( P b,  P c){
45.         return (this.getY()-b.getY())*(this.getX()-c.getX())==(this.getY()-c.getY())*(this.getX()-b.getX());
46.     }
47. private class BySlope implements Comparator<P>{
48. 
    
49.         @Override
50.         public int compare(P o1, P o2) {
51.             if ((P.this.slopeTo(o1)==P.this.slopeTo(o2)))
52.             return 1;
53.         return 0;
54.         }
55.        
56.    
57.     }// BySlope class
58. }

1. public class Xtest extends PApplet{
2.     P [] points;
3.   
4.     public void setup(){
5.         size(800,600);
6.      
   
7.         String [][] temp=myImports.loadCSV("/home/dr/Downloads/points/xx.csv", " ");
8.         int [] data=new int [myImports.csv.length];
9.         points=new P[data.length];
10.         for (int i=0; i<data.length; i++){
11.             points[i]=new P(this,new PVector(Float.parseFloat(temp[i][0]),Float.parseFloat(temp[i][1])));
12.         }
13.        
14.  
15.        
16.         for (int i=0; i<points.length-1; i++){
17.          System.out.println(points[i].getX()+" "+points[i].getY());         
18.         }
19.         Arrays.sort(points,points[0].BY_SLOPE_ORDER);
20.         System.out.println("---------------------------AFTER SORT---------------------");
21.      //print again   
       
    

a short (and most probably stupid) question

1. PVector center;
2.     PVector radius=new PVector(0, 0);
3.     float t;
4.    
5.     public void setup() {
6.       size(600, 600);
7.       smooth();
8.       center=new PVector(width/2, height/2);
9.      
10.     }
11.     public void draw() {
12.      
13.       background(50);
14.       noStroke();
15.       fill(255, 255, 0);
16.    
17.       if (mouseButton==LEFT) {
18.       t=0.1f;
19.       }if(mouseButton==RIGHT  ){
20.           t=-0.2f;
21.       }
22.      
    
23.       radius.x=constrain(lerp(radius.x, 400, t),0,400);
24.       radius.y=constrain(lerp(radius.y, 400, t),0,400);
25.      
26.       ellipse(center.x, center.y, radius.x,radius.y);
27.       println(t+" "+lerp(radius.x, 400, t));
28. }

why is this not working when i assign the same t value on both left & right click like this

1.   if (mouseButton==LEFT) {
2.       t=0.1f;
3.       }if(mouseButton==RIGHT  ){
4.           t=-0.1f;
5.       }

specifically, the right click does not work only if lerp(radius.x, 400, t) reaches its maximum value...
am i missing something?

hi
i am trying to reproduce the map from this  thread   in 2D. I got just the boundary points (not the landmass) from the dataset that is mentioned at the end of the post. i draw the map and then i choose countries to see how the polygon is drawn. So polygons with no holes are correctly drawn,

Germany with no islands



and from the same area France



and this is the code

1. selectedCountry=new Polygon2D(load.coords.get(p1.stringValue()));
2.         fill(100);
3.         gfx.polygon2D(selectedCountry);
4.        // vor=new Voronoi(load.coords.get(p1.stringValue()).size());
5.        
6.         for (int i = 0; i < load.coords.get(p1.stringValue()).size(); i++) {
7.             fill(0,0,255);
8.             ellipse(load.coords.get(p1.stringValue()).get(i).x,
9.                     load.coords.get(p1.stringValue()).get(i).y, .5f,.5f);
10.         }

hi
i have a dataset with 3 cols and ~20.000 lines that contains long/lat coonrdinates like this:
 
Country,longitude,latitude
Italy,523452,64236
Italy,5435,645654
Sweden,4364,673657
Sweden,325,265
etc

i.e there are 20 countries so each ,for example, Italy is repeated 1000 times which means that i have 1000 point coordinates and so on.

so i `ve written this

1.  private String []data;
       private  String [][] csv;
       private String filename="/home/user/coordinates.csv";
       private final int cols=3;
       private String delimiter=",";
2.   PrintWriter output;
       Map < String,ArrayList<PVector>> coords;
       //List<Map<String, PVector>> coords = new ArrayList<Map<String, PVector>>();
     List<Integer> t=new ArrayList<Integer>();
   
3. 
   
4.  public void loadData(){
5.       output=pa.createWriter("/home/user/points.txt");
6.       data=pa.loadStrings(filename);
7.       ArrayList<PVector> tempPoints=new ArrayList<PVector>(data.length);
8.      // Set<String> tempNames=new HashSet <String> ();
9.       coords=new HashMap<String,ArrayList<PVector>>(data.length);
10.       csv=new String[data.length][cols];
11.       for (int i=0; i<data.length; i++){
12.           for (int j=0; j<cols; j++){
13.               String [] tempGeo=pa.split(data[i], delimiter);
14.               csv[i][j]=tempGeo[j];    
15.                               
16.                }//FOR J
17.                tempPoints.add(new PVector(Float.parseFloat(csv[i][1]),Float.parseFloat(csv[i][2])));
18.           //  tempNames.add( csv[i][0]);
19.              
20.           coords.put(new String (csv[i][0]),tempPoints);
21.       
22.       }//FOR I
23.       for (String s: coords.keySet()){
24.           output.println(s);
25.       for (PVector pv:coords.get(s))
26.           output.println(pv);
27.       
28.       
29.       }

hi i have written  a function to get the arraylist`s index values  that contain the number occurrences of  each state.The csv file is 24499 rows and 3 columns

1.  String [] states=new String [24499];
    String [] stateNames(){
      for (int i=0; i<data.length; i++){
        states[i]=csv[i][0];
          }
      return states;
    }
   
2. 
   
3.  //in this function s is a string that holds one state name  with a leftClick mouseFunction
   
4. void  indices(){
5.    int occurences=0;
6.  
7.  
8.   List myList=Arrays.asList(stateNames()); //
9.  Iterator iterator=myList.iterator();
10.  while(iterator.hasNext()){
11.    println((String) iterator.next());  //it breaks without this line(?)
    
12.  }
13.  if (myList.contains(s)){
14.    occurences=Collections.frequency(myList,s);
15.    }
16.  
17.    List<Integer> indices=new ArrayList<Integer>(occurences);
18.      for (int i=0; i<occurences; i++){
19.       if(s.equals(myList.get(i))){
20.        indices.add(i);
21.       }
22. }
23. print(s+" "+occurences+" " );
24. println(indices);
25.  }

the strange thing is that i get the number of occurrences correct for all states but the index values are correct *only* for two states (i get no values (a blank [] ) for the rest of the states)...anyone has an idea why this might be happening?

its the first time i use collections etc, is this the correct way to do something like this?...what i want to do (if it helps) is get the index values,store them in an array and then for these values draw some points with csv[indexValues][1] and csv[indexValues][2]

last thing: is it possible to write functions like
Arraylist something(){
//blabla
} return somethingElse;

without using generics?

hi, (newbie here and first attempt on maps)
i have a data set (36900x2) with a country`s coordinates (floats) that i produced in R with some shapefiles. I then took the coordinates and imported  them (as csv) in processing to draw the map. When i draw the map with points(x,y) i get a fairly good result but when i try to use vertex i get this.
i tried to use the java polygon class but it is only for integers, is there a way to draw the map with polygon class and float coordinates?
or can you suggest an another way to do this
thanks

hi, newbie here so i guess it is a simple question.
i loaded a tab delimited csv file (panel) in a 2d array and i want to find the max value of the second column (actually of columns but that is step 2). As i have understood, max() takes only the name of the array so i create an float array (toFind) in order to find it but it does not work...

here is what i have done

1. String [] data;
2. String [][] csv;
3. float c;
4. void setup(){
5.   size(100,100);
6.   data=loadStrings("crime.txt");
7.   csv=new String [data.length][9];
8.   for (int i=0; i<data.length; i++){
9.     String [] temp=new String [data.length];
10.     temp=split(data[i], "\t");
11.     for (int j=0; j<9; j++){
12.       csv[i][j]=temp[j];
13.     }
14.     
    
15.   }
16.   for (int i=1; i<data.length; i++){
17.     float [] toFind=new float [data.length];
18.     toFind[i]=Float.parseFloat(csv[i][1]);
19.     c=max(toFind);
20.     print(c);
21.     
22.   }
23. }

the strange thing is when i use max() it prints the values of the column 1, whereas when i use min() i prints only zeros...

any ideas?