Pendulum Processing

pendulum

// x genlik
float x= (PI/2);
float pos=0; 
float pos1=0;
 //float a = atan2(mouseY-height/2, mouseX-width/2);
void setup() {
  size(800, 800);
}
 
void draw() {
  background(255);

  float a = atan2(mouseY-height/2, mouseX-width/2);
  if(mousePressed){
  translate(width/2, height/2);
 //float a = atan2(mouseY-height/2, mouseX-width/2);
  rotate(a-x);
  pos1=(a-x);
  stroke(0);
  println(pos1);
  //line(-400,0,400,00);
  //line(0,-400,0,400);
 // rotate(pos); 
  stroke(0);
  line(0, 0, 0, 300);
  fill(0, 133, 200);
  noStroke();
  ellipse(0, 300, 40, 40);

  }
  else{
  translate(width/2, height/2);
 // pos = (pos1*cos(millis()/1600.0));
 rotate(pos1*cos(millis()/1600.0));
  stroke(0);
  //line(-400,0,400,00);
  //line(0,-400,0,400);
 //rotate(pos1*cos(millis()/1600.0));
  stroke(0);
 line(0, 0, 0, 300);
  fill(0, 133, 200);
  noStroke();
  ellipse(0, 300, 40, 40);
  println(pos1);
  }

//println(x_pos);
//println(y_pos);
}