Punto animado Frankenstein | Lógica de programación: Practicando con juegos y animaciones | Alura Latam

<!DOCTYPE html>
<html lang="es">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>moving</title>
  </head>

  <body>

    <style>
      body {
        margin: 0;
        background-color: black;
      }

      .container {
        display: flex;
        align-items: center;
        justify-content: center;
        flex-direction: column;
        align-content: center;
        height: 100vh;
      }

      #canvas-1 {
        position: relative;
        width: 600px;
        height: 400px;
        border: 5px dashed white;
      }

      .item {
        text-align: center;
      }

      h1 {
        font-size: 2.5vw;
        font-weight: 900;
        margin: 10px;
        color: white;
      }

      p {
        font-size: 1.1vw;
        margin: 30px;
        color: white;
      }
    </style>

  </body>

<div class="container">
  <div class="item">

    <h1 style="font-family: 'Courier New', Courier, monospace">
    </h1>
    <p style="font-family: monospace">
      vamos, click secundario, no seas cobarde.
    </p>

  </div>
  <canvas id="canvas-1" width="600" height="400"> </canvas>
</div>

<script>

// VARIABLES --------------------------------------->
  var screen = document.querySelector("canvas");
  var brush = screen.getContext("2d");
  brush.fillStyle = "black";
  brush.fillRect(0, 0, 600, 400);
  var colorArray = ["goldenrod", "beige", "tomato"];
  var startColorIndex = 0;


// FUNCIONES ------------------------------------------->
  function createCircle(x, y, radio) {
    brush.fillStyle = colorArray[startColorIndex]
    brush.beginPath();
    brush.arc(x, y, radio, 0, Math.PI*2);
    brush.fill();
  };

  function clearCanvas() {
    brush.clearRect(0, 0, 600, 400)
  };

  let x = 20;
  let y = 20;
  let radio = 1;

  function updateCanvas() {
    clearCanvas();
    createCircle(x, y, radio);
    x ++;
    y ++;
    radio ++;
    brush.fillStyle = colorArray[startColorIndex]
    danger();
  };

  function colorCycle() {
    startColorIndex++;
    // LOOP PARA CAMBIAR POR CLICK DESDE LA SECUENCIA 'COLORARRAY'
    if (startColorIndex >= colorArray.length) {
      startColorIndex = 0;
    }
    return false; /* EVITAR MENU CONTEXTUAL, EL CLASICO CLICK SENCUDARIO */
  }

  setInterval(updateCanvas, 50);
  screen.oncontextmenu = colorCycle;

  function danger() {
  if (radio == 200) {
    alert("oh no...");
  }
};


</script>

</html>