wuriyanto48/index.html

## index.html
<!DOCTYPE html>
<html>
<head>

</head>
<body>

<canvas id="myCanvas" width="800" height="400" style="border:1px solid #000000;">
Your browser does not support the HTML canvas tag.
</canvas>

<input type="range" min="1" max="100" value="1" class="slider" id="tval">

<script>
  function draw() {
    var tval = document.getElementById("tval");
    var canvas = document.getElementById("myCanvas");
    var ctx = canvas.getContext("2d");

    var p1 = {x: 70, y: 200};
    var p2 = {x: 200, y: 50};
    var p3 = {x: 200, y: 300};

    function addPoint(p1, p2) {
      return {x: p1.x+p2.x, y: p1.y+p2.y};
    }

    function subPoint(p1, p2) {
      return {x: p1.x-p2.x, y: p1.y-p2.y};
    }

    function lerp(p1, p2, t) {
      // t = time or percentage how far between p1 and p2
      var lx = (1 - t) * p1.x + t * p2.x;
      var ly = (1 - t) * p1.y + t * p2.y;

      return {x: lx, y: ly};
    }

    ctx.fillStyle = "black";
    ctx.fillRect(0, 0, canvas.width, canvas.height);

    ctx.beginPath();
    ctx.moveTo(p1.x, p1.y);
    ctx.lineTo(p2.x, p2.y);
    ctx.lineTo(p3.x, p3.y);
    ctx.strokeStyle = "red";
    ctx.stroke();

    tval.addEventListener("change", function() {
      var t = tval.value / 100;
      var l1 = lerp(p1, p2, t);
      var l2 = lerp(p2, p3, t);

      var q1 = lerp(l1, l2, t);
      ctx.fillStyle = "red";
      ctx.fillRect(q1.x, q1.y, 10, 10);
      console.log(q1);
    }, false);


  }

  window.requestAnimationFrame(draw);

</script>
</body>
</html>
	<!DOCTYPE html>
	<html>
	<head>

	</head>
	<body>

	<canvas id="myCanvas" width="800" height="400" style="border:1px solid #000000;">
	Your browser does not support the HTML canvas tag.
	</canvas>

	<input type="range" min="1" max="100" value="1" class="slider" id="tval">

	<script>
	function draw() {
	var tval = document.getElementById("tval");
	var canvas = document.getElementById("myCanvas");
	var ctx = canvas.getContext("2d");

	var p1 = {x: 70, y: 200};
	var p2 = {x: 200, y: 50};
	var p3 = {x: 200, y: 300};

	function addPoint(p1, p2) {
	return {x: p1.x+p2.x, y: p1.y+p2.y};
	}

	function subPoint(p1, p2) {
	return {x: p1.x-p2.x, y: p1.y-p2.y};
	}

	function lerp(p1, p2, t) {
	// t = time or percentage how far between p1 and p2
	var lx = (1 - t) * p1.x + t * p2.x;
	var ly = (1 - t) * p1.y + t * p2.y;

	return {x: lx, y: ly};
	}

	ctx.fillStyle = "black";
	ctx.fillRect(0, 0, canvas.width, canvas.height);

	ctx.beginPath();
	ctx.moveTo(p1.x, p1.y);
	ctx.lineTo(p2.x, p2.y);
	ctx.lineTo(p3.x, p3.y);
	ctx.strokeStyle = "red";
	ctx.stroke();

	tval.addEventListener("change", function() {
	var t = tval.value / 100;
	var l1 = lerp(p1, p2, t);
	var l2 = lerp(p2, p3, t);

	var q1 = lerp(l1, l2, t);
	ctx.fillStyle = "red";
	ctx.fillRect(q1.x, q1.y, 10, 10);
	console.log(q1);
	}, false);


	}

	window.requestAnimationFrame(draw);

	</script>
	</body>
	</html>