Hi Everyone,

I am new to processing, and have a question, which is probably simple for many of you. I hope someone is willing to help me.

In the code below, you will notice at the bottom that a .txt file is being loaded. Suppose I have a whole library of .txt files named 1,2,3 and so forth. How do I load the next file (ie. 2 after 1, 3 after 2 etc) after the user presses a key?

The current code basically takes the text file, which contains coordinates for dots, and draws these dots. The effect I am after is after a user key press, a new drawing is made, because the code takes the data from 2.txt, key press, 3.txt, key press 4.txt and so forth...




/*
  *** Our text file will look something like below, #
  where each line corresponds to the x,y,z coordinate of a point!
  coordX, coordY, coorzZ
  coordX, coordY, coorzZ
  coordX, coordY, coorzZ
  ... etc
  */ 
 
  /*-----------------------------------------------------------------------------
 *** GLOBAL VARIABLES ***
 -----------------------------------------------------------------------------*/
ArrayList pointList;                   // arraylist to store the points in
 
/*-----------------------------------------------------------------------------
 *** GLOBAL INIT ***
 -----------------------------------------------------------------------------*/
void setup(){
 
  //-------------------------------- GENERAL
  size(800,800);
  background(0);
 
  //-------------------------------- POINTS
  pointList = new ArrayList();    // instantiate an ArrayList
  importTextFile();               // call our custom function
 
}
 
/*-----------------------------------------------------------------------------
 *** MAIN PROGRAM LOOP ***
 -----------------------------------------------------------------------------*/
void draw(){
 
  //-------------------------------- GENERAL
  background(0); 
  stroke(210);
  fill(210,90);
 
  //-------------------------------- VISUALIZE THE POINT SET
  for(int i = 0; i < pointList.size(); ++i){       
    PVector V = (PVector) pointList.get(i);
    ellipse(V.x,V.y, 20, 20);
  }
 
}
 
/*-----------------------------------------------------------------------------
 *** CUSTOM IMPORT FUNCTION ***
 -----------------------------------------------------------------------------*/
 
void importTextFile(){  
  String[] strLines = loadStrings("1.txt"); // the name and extension of the file to import!
  for(int i = 0; i < strLines.length; ++i){
    String[] arrTokens = split(strLines[i], ',');    // use the split array with character to isolate each component
    float xx = float(arrTokens[0]);                  // cast string value to a float values!
    float yy = float(arrTokens[1]);                  // cast string value to a float values!
    pointList.add( new PVector(xx,yy) );             // add values to a new array slot
 }
}