//Simple Distance Bar - Used to display the distance measured by a ToF device
//Mauro Herrero  Fab Academy 2021
//Portions of code (serialEvent) Marta Verde

import processing.serial.*; //load library to read from serial port

float distance; // value read from serial
int dispDist = floor(distance);//displayed value take rid of decimals;
Serial myPort; // port opened for serial communication
float barLength = map (distance, 0, 320, 0, 800);//map max displayed lenght with max measured lenght;
String inString; //incoming data through myPort
float [] values; //array of incoming data, comma separated values
int displayFontSize = 32; // size of length display font
float textY = (3*height/4) + displayFontSize; // Y position of length text

void setup (){
   size(800,400); //set window size
   myPort = new Serial(this, "/dev/ttyUSB0", 115200); //set myPort to connected dev/ttyUSB0 @115200 bauds
}

void serialEvent(Serial myPort) { //function used to capture data from serial
  inString = myPort.readStringUntil('\n'); // read incoming data up to line next line break
  if (inString != null){ // if there is data...
    inString = trim(inString); // remove whitespace characters from the beginning and end
    values = float(split(inString, ",")); //assemble an array of elements, of the data separated by commas
    if (values.length >=1) { // if the array has data...
      distance = values[0]; // asign data on index 0 to variable distance
    }
  }
}
      
void draw(){ // looping function
  background(220); //set background color
  fill(100,140,140);// set fill for measured bar
  rect(0, height/4, barLength, height/2);//draw measuring bar
  fill(180,220,240);//set fill for rest of bar
  rect(barLength, height/4, width-barLength, height/2);//draw with another color to the end
  fill(80,120,120);//set text color
  textSize(displayFontSize);
  if(barLength > 60 && barLength < width-60){//display text moving along measuring bar
    text(dispDist, barLength, textY);
  }else if(barLength < 60){//display text at a minimum of 60px of the edge
    text(dispDist, 60, textY);
  }else {
    text(dispDist, width-60, textY);
  }
 }