Basic motion controller Processing sketch

gistfile1.java

import processing.serial.*; // import the Processing serial library
Serial myPort;              // The serial port

float bgcolor;               // Background color
float fgcolor;                 // Fill color
float xDegree, yDegree;        // Starting position of the ball
boolean firstContact = false;

int buttonState;
// boolean button = false;

int x, y;


void setup() {
  size(600, 600);
  int x = 300;
  int y = 300;

  //println(Serial.list());

  //define the serial port
  String portName = "/dev/tty.usbmodem1411";
  myPort = new Serial(this, portName, 9600);

  myPort.bufferUntil('\n');
}

void draw() {
  background(bgcolor);
  if (xDegree < 160) {
    x = x  - 5;
  } else if (xDegree > 360) {
    x = x + 5;
  } else {
    x=x;
  }

  if (x < 0) {
    x = 0;
  } else if (x >width) {
    x = width;
  }

  if (yDegree > 375) {
    y = y - 5;
  } else if (yDegree < 220) {
    y = y + 5;
  } else {
    y = y;
  }

  if (y > height) {
    y = height;
  } else if (y < 0) {
    y = 0;
  }

  if (buttonState == 0) {
    fill(255);
  } else {
    fill(255, 0, 0);
  }

  ellipse(x, y, 20, 20);

  println(xDegree, yDegree, buttonState);
}


void serialEvent(Serial myPort) {
  // read the serial buffer:
  String myString = myPort.readStringUntil('\n');
  // if you got any bytes other than the linefeed:
  if (myString != null) {

    myString = trim(myString);

    // if you haven't heard from the microncontroller yet, listen:
    if (firstContact == false) {
      if (myString.equals("hello")) {
        myPort.clear();          // clear the serial port buffer
        firstContact = true;     // you've had first contact from the microcontroller
        myPort.write('A');       // ask for more
      }
    }
    // if you have heard from the microcontroller, proceed:
    else {
      // split the string at the commas
      // and convert the sections into integers:
      int sensors[] = int(split(myString, ','));

      // print out the values you got:
      for (int sensorNum = 0; sensorNum < sensors.length; sensorNum++) {
        //    print("Sensor " + sensorNum + ": " + sensors[sensorNum] + "\t");
      }
      // add a linefeed after all the sensor values are printed:
      println();

      //println(xpos,ypos);

      if (sensors.length > 1) {
        xDegree = map(sensors[0], 270, 420, 0, width);
        yDegree = map(sensors[1], 270, 420, 0, height);
        buttonState = sensors[2];
      }
    }
    // when you've parsed the data you have, ask for more:
    myPort.write("A");
  }
}