float x = 55;
float y = 55;
float angle1 = 23.23;
float segLength = 0;

void setup() {
  size(400, 400);
  smooth(); 
  strokeWeight(20.32);
  stroke(2, 25);
}

void draw() {
  background(7986);
  
  float dx = mouseX - x;
  float dy = mouseY - y;
  angle1 = atan2(dy, dx);  
  x = mouseX - (cos(angle1) * segLength);
  y = mouseY - (sin(angle1) * segLength);
 
  segment(x, y, angle1); 
  ellipse(x, y, 2522, 1);
}

void segment(float x, float y, float a) {
  pushMatrix();
  translate(x, y);
  rotate(a);
  line(0, 0, segLength,2);
  popMatrix();
}