BufferedReader reader;
String line;
PGraphics pg;

float x=0;
float y1=0;
float y2=0;
String[] positions=new String[1000];
PFont font;

void setup() {
  reader = createReader("data.txt");    
  size(755,256);
  frameRate(200);
  smooth();
  font = loadFont("font.vlw"); 
  textFont(font,14); 

  pg=createGraphics(755, 256, P2D);
  pg.beginDraw();
  pg.smooth();
  pg.background(255);
  pg.stroke(0);

  boolean run=true;
  while(run){

    try {
      line = reader.readLine();
    } 
    catch (IOException e) {
      e.printStackTrace();
      line = null;
    }
    if (line == null) {
      // Nothing left in the file, stop reading.
      run=false;
    } 
    else {
      String[] pieces = split(line, ' ');
      float a = float(pieces[1]);
      float b = float(pieces[2]);
      pg.line(x, 127-a/1024*128,x,128);
      pg.line(x, 255-b/1024*128,x,256);
      positions[int(x)]=pieces[0]+" "+str(round(a/1024*5*100)/100.0)+"V "+str(round(b/1024*5*1000))+"mA";
    } 
    x+=0.1;
  }
  pg.endDraw();
}


void draw() {

  image(pg,0,0);
  fill(255,0,255);
  text(positions[mouseX], (mouseX+textWidth(positions[mouseX])<width)?mouseX:width-textWidth(positions[mouseX]), mouseY);
}