如何制作一个始终面对同一点的三角形？

let fromX = 200;
let fromY = 200;
let toX = 300;
let toY = 100;
let triangleSize = 5;

function setup() {
  createCanvas(400, 400);
}

function draw() {
  background(220);
  
  // test: change to position
  toX = mouseX;
  toY = mouseY;
  
  let middleX = (fromX + toX) / 2;
  let middleY = (fromY + toY) / 2;
  // calculate the angle between from -> to points
  let angle = atan2(toY - fromY, toX - fromX);
  // isolate coordinate system (indenting is purely visual, not required)
  push();
    // move to central position
    translate(middleX, middleY);
    // rotate from translated position
    rotate(angle);
    // render triangle
    triangle(0, triangleSize, triangleSize, 0, 0, -triangleSize);
  pop();
  
  line(fromX, fromY, toX, toY);
  
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.0.0/p5.min.js"></script>