AoC 2019 - Day 2 - ProcessingSketch (not Working)

String fileName = "input.txt";
//String fileName = "testdata.txt";
BufferedReader reader;
String line;
Integer[] currentCoords;
color lineColor;
ArrayList<Integer[]> coords1;
ArrayList<Integer[]> coords2;
IntList hits;

void setup() {
  size(600, 600);
  background(0);
  reader = createReader(fileName);
  currentCoords = new Integer[] {0,0};
  lineColor = color(255,0,0);
  coords1 = new ArrayList<Integer[]>();
  coords2 = new ArrayList<Integer[]>();
  hits = new IntList();

}

void draw() {
 pushMatrix();
 translate(width/2,height/2);
 scale(1);
 for(int i=0; i <= 1; i++){
      line = parseInput(reader);
      if(line != null) {
        String[] listSplit = split(line, ',');
        for( String value : listSplit ) {
          String direction = value.substring(0, 1);
          int amount = int(value.substring(1));
          for(int j=0; j < amount; j++){
            drawLoc(direction);
            stroke(lineColor);
            point(currentCoords[0], currentCoords[1]);
            if(i==0)
              coords1.add(new Integer[]{currentCoords[0], currentCoords[1]});
            if(i==1)
              coords2.add(new Integer[]{currentCoords[0], currentCoords[1]});
            }
          }
        }
        lineColor = color(0,0,255);
        currentCoords = new Integer[] {0,0};
        println("first row done " + coords1.size() + " " + coords2.size());
  }
  popMatrix();

 for(int i=0; i < coords1.size(); i++) {
   Integer[] linePos1 = coords1.get(i);
   for(int j=0; j < coords2.size(); j++) {
     Integer[] linePos2 = coords2.get(j);
     if(linePos1[0] == linePos2[0] &&  linePos1[1]  == linePos2[1]) {
                  //hits.append(coordValue[0] + (-coordValue[1]));
                  println("hit" + linePos2[0] + " " + linePos2[1]);
     }
   }
 }
 noLoop();

}

void drawLoc(String direction) {
    switch(direction) {
        case "U":
          currentCoords[1]--;
        break;
        case "D":
          currentCoords[1]++;
        break;
        case "L":
          currentCoords[0]--;
        break;
        case "R":
          currentCoords[0]++;
        break;
  }
}

String parseInput(BufferedReader reader) {
  String line;
       try {
        line = reader.readLine();
      }
      catch (IOException e) {
        line = null;
      }
  return line;
}