int bufsize = 250;
int count1 = 0;
int count2 = 0;
float[] mousepos1X = new float[bufsize];
float[] mousepos1Y = new float[bufsize];
float[] mousepos2X = new float[bufsize];
float[] mousepos2Y = new float[bufsize];

float sabunX,sabunY,sabun;

boolean mode = false;
float zeroselect;

void setup(){
  background(255);


  size(500,400);
  for(int i=0; i<bufsize; i++){
    mousepos1X[i] = 0;
    mousepos1Y[i] = 0;
    mousepos2X[i] = 0;
    mousepos2Y[i] = 0;
  }


}

void draw(){

  sabunX = abs(pmouseX-mouseX);
  sabunY = abs(pmouseY-mouseY);

  sabun = sabunX+sabunY;

  if(count1 > bufsize-2){
    background(0);
    count1 = 0;
    mode = true;
  }
  if(count2 > bufsize-2){
    background(255);
    count2 = 0;
    mode = false;
  }

  if(sabun>1.0 && mode == false){
    ++count1;
    println(count1);
  }
  if(sabun>1.0 && mode == true){
    ++count2;
  }


  if(mousePressed && mode == false){
    if(count1 == 0 ){

    }
    else if(mousepos2X[count1-1]+mousepos2Y[count1-1]>0 && mousepos2X[count1]+mousepos2Y[count1]>0){
      stroke(0);
      line(mousepos2X[count1-1],mousepos2Y[count1-1],mousepos2X[count1],mousepos2Y[count1]);
    }
  }
  if(mousePressed && mode == true){
    if(count2 == 0 ){

    }
    else if(mousepos1X[count2-1]+mousepos1Y[count2-1]>0 && mousepos1X[count2]+mousepos1Y[count2]>0){
      stroke(255);
      line(mousepos1X[count2-1],mousepos1Y[count2-1],mousepos1X[count2],mousepos1Y[count2]);
    }

  }

  if(mousePressed && sabun>1.0 &&mode == false){
    mousepos1X[count1] = mouseX;
    mousepos1Y[count1] = mouseY;
  }
  else if(sabun>1.0 &&mode == false){
    mousepos1X[count1] = 0;
    mousepos1Y[count1] = 0;
  }

  if(mousePressed && sabun>1.0 &&mode == true){
    mousepos2X[count2] = mouseX;
    mousepos2Y[count2] = mouseY;
  }
  else if(sabun>1.0 &&mode == true){
    mousepos2X[count2] = 0;
    mousepos2Y[count2] = 0;
  }

  if(mousePressed){
    stroke(255,0,0);
    line(pmouseX,pmouseY,mouseX,mouseY);
  }

  if(mode == false){
    stroke(255,0,0);
    point(count1*2,390);
  }
  else if(mode == true){
    stroke(255,0,0);
    point(count2*2,390);

  }

}