My Sketch

function setup() {

  createCanvas(windowWidth, windowHeight);

}

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var posX = 0;

var posY = 0;

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var tarX = 0;

var tarY = 0;

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var speed = 5;

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function draw() {

  background(255);

  rect(posX, posY, 40, 40);

  if (mouseIsPressed) {

    tarX = mouseX;

    tarY = mouseY;

  }

  print(posX + " | " + posY);

  if (tarX != posX) {

  var slope = (tarX - posX) / (tarY - posY);

  var theta = atan2(slope);

  var xOut = sin(theta) * speed;

  var yOut = cos(theta) * speed;

  posX += xOut;

  posY += yOut;

  }

}

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/**/