FYF_Processing_code_controlling_winch_servo_and_shadow

gistfile1.txt

 PImage shadow;
import processing.serial.*;
PVector a = new PVector(150, 0);
PVector b = new PVector(0, 150);
float angle;
PVector v1;
PVector v2;
float q;
float len;
float root;
Serial myPort;  

void setup() {
  size(600, 400);
  shadow = loadImage("shadow.png");
    String portName = Serial.list()[3]; //change the 0 to a 1 or 2 etc. to match your port
  myPort = new Serial(this, portName, 9600);
}

void draw() {
  background(255);
  pushMatrix();
  translate(width/2, height/2);
  fill(0);
  line(0, 0, a.x, a.y);
  line(0, 0, b.x, b.y);
  b.set(mouseX-width/2, mouseY-height/2, 0);
  //if (mousePressed) {
  //  a.set(mouseX-width/2, mouseY-height/2, 0);
 // }

  angle = angle(a, b);

  drawArc();
  //ellipse(0, 0, 50, 50);
  fill(255);
  text(int(degrees(angle)), 0, 0);
  q = degrees(angle);
  text(int(q), 50, 50);
  myPort.write(int(degrees(angle))/4);

  popMatrix();
  translate(width/2, height/2);
  rotate(radians(q+90));
  len = sq(mouseX-300) + sq(mouseY-200);
  root = sqrt(len);
  println(root);
  image(shadow, -50, 0, 100, root);
}

void drawArc() {
  float angleStart = angle(new PVector(1, 0), a);
  float angleEnd = angle(new PVector(1, 0), b);
  //arc(0, 0, 150, 150, angleStart, angleEnd);
  //if (angleEnd < angleStart) {
   // arc(0, 0, 150, 150, angleStart, TWO_PI);
    //arc(0, 0, 150, 150, 0, angleEnd);
  }
//}
float angle(PVector v1, PVector v2) {
  float a = atan2(v2.y, v2.x) - atan2(v1.y, v1.x);
  if (a < 0) a += TWO_PI;
  return a;
}