Having issues with the right margin in HTML5 canvas and struggling to remove the scroll bar

Question

Having issues with the right margin in HTML5 canvas and struggling to remove the scroll bar

I am struggling with adjusting the margins of my canvas to ensure equal spacing on both sides without any horizontal scroll bars.

Desired Outcome: Equal margin on both sides of canvas without any horizontal scroll bars.

Issue: The margin-right property is not working as expected. While some solutions suggest specifying a fixed width, that is not suitable for my needs. I require the canvas to dynamically adjust its dimensions based on the window size.

To address this, I am using the following Javascript function:

window.addEventListener('resize' , resizeCanvas , false);

function resizeCanvas(){
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight/1.2;
}

Do you have any alternative solutions to this problem?

Regarding the overflow issue, adding overflow-x: hidden to the body only hides the scrollbar but does not fix the problem. The canvas still extends beyond the screen, making the right border invisible. View here

Below is the code I am working with:

HTML

<body onload="start()">
    <canvas id="myCanvas"></canvas>
</body>

CSS

body{

}

canvas{

    border: 1px solid black;
    border-radius: 5px;
    background-color: #fff;

    margin: auto 50px auto 50px; /* left margin works, but right does not */

}

Thank you!

Additional Note:

I have refrained from setting width: 100% for the canvas to prevent distortion of the content inside it.

javascript css html canvas

Answer 1

Answer №1

According to Chris, it is important to adjust the width of the canvas to be less than the full width of the page:

canvas.width = window.innerWidth - 100;

Keep in mind that you should also consider the border-width of the canvas and the 8px margin of the body in your codepen when making this adjustment:

canvas.width = window.innerWidth - 118;

Answer 2

According to Chris, it is important to adjust the width of the canvas to be less than the full width of the page:

canvas.width = window.innerWidth - 100;

Keep in mind that you should also consider the border-width of the canvas and the 8px margin of the body in your codepen when making this adjustment:

canvas.width = window.innerWidth - 118;

Answer 3

Answer №2

CSS calc() function can be used to achieve the desired result by subtracting the margins from 100%. Check out the demo below. CSS calc() reference

function start() {

  var canvas = document.getElementById('myCanvas');
  canvas.width = window.innerWidth;
  canvas.height = window.innerHeight / 1.2;
  var ctx = canvas.getContext('2d');

  function rand(min, max) {
    return parseInt(Math.random() * (max - min + 1), 10) + min;
  }

  function get_random_color() {
    var h = rand(1, 360);
    var s = rand(30, 100);
    var l = rand(30, 70);
    return 'hsl(' + h + ',' + s + '%,' + l + '%)';
  }

  function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
  }

  var balls = [];
  var ballCount = getRandomInt(2, 10);
  var startpointX = 100;
  var startpointY = 50;

  for (var i = 0; i < ballCount; i++) {

    var randValue = getRandomInt(20, 30);
    balls.push({
      x: startpointX,
      y: startpointY,
      vx: getRandomInt(3, 3) * direction(),
      vy: getRandomInt(1, 1) * direction(),
      radius: randValue,
      mass: randValue,
      color: get_random_color(),

      draw: function() {
        ctx.beginPath();
        ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, true);
        ctx.closePath();
        ctx.fillStyle = this.color;
        ctx.fill();
      }
    });

    startpointX = startpointX + 50;
    startpointY = startpointY + 40;
  }


  function direction() {
    var chosenValue = Math.random() < 0.5 ? 1 : -1;
    return chosenValue;
  }

  function draw() {

    ctx.clearRect(0, 0, canvas.width, canvas.height);
    for (var i = 0; i < ballCount; i++) {

      balls[i].draw();
      balls[i].x += balls[i].vx;
      balls[i].y += balls[i].vy;

      if ((balls[i].y + balls[i].vy + balls[i].radius) > canvas.height || (balls[i].y + balls[i].vy - balls[i].radius) < 0) {
        balls[i].vy = -balls[i].vy;
      }
      if ((balls[i].x + balls[i].vx + balls[i].radius) > canvas.width || (balls[i].x + balls[i].vx - balls[i].radius) < 0) {
        balls[i].vx = -balls[i].vx;
      }
    }

    //collision check
    for (var i = 0; i < ballCount; i++) {
      for (var j = i + 1; j < ballCount; j++) {

        var distance = Math.sqrt(
          (balls[i].x - balls[j].x) * (balls[i].x - balls[j].x) +
          (balls[i].y - balls[j].y) * (balls[i].y - balls[j].y)
        );

        if (distance < (balls[i].radius + balls[j].radius)) {

          var ax = (balls[i].vx * (balls[i].mass - balls[j].mass) + (2 * balls[j].mass * balls[j].vx)) / (balls[i].mass + balls[j].mass);
          var ay = (balls[i].vy * (balls[i].mass - balls[j].mass) + (2 * balls[j].mass * balls[j].vy)) / (balls[i].mass + balls[j].mass);
          balls[j].vx = (balls[j].vx * (balls[j].mass - balls[i].mass) + (2 * balls[i].mass * balls[i].vx)) / (balls[i].mass + balls[j].mass);
          balls[j].vy = (balls[j].vy * (balls[j].mass - balls[i].mass) + (2 * balls[i].mass * balls[i].vy)) / (balls[i].mass + balls[j].mass);
          balls[i].vx = ax;
          balls[i].vy = ay;
        }
      }
    }

    raf = window.requestAnimationFrame(draw);
  }


  function onBoxTouched() {

    for (var i = 0; i < ballCount; i++) {

      if (balls[i].x + balls[i].radius > 600 && balls[i].x + balls[i].radius < 750 &&
        balls[i].y + balls[i].radius > 200 && balls[i].y + balls[i].radius < 350) {

        ele.style.backgroundColor = balls[i].color;

        balls.splice(i, 1);
        ballCount = ballCount - 1;

        if (ballCount == 0) {
          ele.style.fontSize = "x-large";
          ele.innerHTML = "Over";
        } else {
          ele.innerHTML = ballCount;
        }
      }
    }
  }

  window.requestAnimationFrame(draw);

  window.addEventListener('resize', resizeCanvas, false);

  function resizeCanvas() {
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight / 1.2;
  }

}

* {}

html,
body {}

canvas {
  border: 1px solid black;
  border-radius: 5px;
  background-color: #fff;
  width: calc(100% - 40px);
  margin: auto 20px auto 20px;
}

#box {
  width: 150px;
  height: 150px;
  background-color: plum;
  border-radius: 5px;
  position: absolute;
  top: 200px;
  left: 600px;
  font-size: 72px;
  font-weight: bold;
  color: white;
  line-height: 150px;
  text-align: center;
}

#info {
  float: left;
  font-size: 24px;
  color: #6D8390;
  margin-top: 20px;
}

<body onload="start()">
  <canvas id="myCanvas"></canvas>
</body>

Hope this solution works for you :)

Answer 4

CSS calc() function can be used to achieve the desired result by subtracting the margins from 100%. Check out the demo below. CSS calc() reference

function start() {

  var canvas = document.getElementById('myCanvas');
  canvas.width = window.innerWidth;
  canvas.height = window.innerHeight / 1.2;
  var ctx = canvas.getContext('2d');

  function rand(min, max) {
    return parseInt(Math.random() * (max - min + 1), 10) + min;
  }

  function get_random_color() {
    var h = rand(1, 360);
    var s = rand(30, 100);
    var l = rand(30, 70);
    return 'hsl(' + h + ',' + s + '%,' + l + '%)';
  }

  function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
  }

  var balls = [];
  var ballCount = getRandomInt(2, 10);
  var startpointX = 100;
  var startpointY = 50;

  for (var i = 0; i < ballCount; i++) {

    var randValue = getRandomInt(20, 30);
    balls.push({
      x: startpointX,
      y: startpointY,
      vx: getRandomInt(3, 3) * direction(),
      vy: getRandomInt(1, 1) * direction(),
      radius: randValue,
      mass: randValue,
      color: get_random_color(),

      draw: function() {
        ctx.beginPath();
        ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, true);
        ctx.closePath();
        ctx.fillStyle = this.color;
        ctx.fill();
      }
    });

    startpointX = startpointX + 50;
    startpointY = startpointY + 40;
  }


  function direction() {
    var chosenValue = Math.random() < 0.5 ? 1 : -1;
    return chosenValue;
  }

  function draw() {

    ctx.clearRect(0, 0, canvas.width, canvas.height);
    for (var i = 0; i < ballCount; i++) {

      balls[i].draw();
      balls[i].x += balls[i].vx;
      balls[i].y += balls[i].vy;

      if ((balls[i].y + balls[i].vy + balls[i].radius) > canvas.height || (balls[i].y + balls[i].vy - balls[i].radius) < 0) {
        balls[i].vy = -balls[i].vy;
      }
      if ((balls[i].x + balls[i].vx + balls[i].radius) > canvas.width || (balls[i].x + balls[i].vx - balls[i].radius) < 0) {
        balls[i].vx = -balls[i].vx;
      }
    }

    //collision check
    for (var i = 0; i < ballCount; i++) {
      for (var j = i + 1; j < ballCount; j++) {

        var distance = Math.sqrt(
          (balls[i].x - balls[j].x) * (balls[i].x - balls[j].x) +
          (balls[i].y - balls[j].y) * (balls[i].y - balls[j].y)
        );

        if (distance < (balls[i].radius + balls[j].radius)) {

          var ax = (balls[i].vx * (balls[i].mass - balls[j].mass) + (2 * balls[j].mass * balls[j].vx)) / (balls[i].mass + balls[j].mass);
          var ay = (balls[i].vy * (balls[i].mass - balls[j].mass) + (2 * balls[j].mass * balls[j].vy)) / (balls[i].mass + balls[j].mass);
          balls[j].vx = (balls[j].vx * (balls[j].mass - balls[i].mass) + (2 * balls[i].mass * balls[i].vx)) / (balls[i].mass + balls[j].mass);
          balls[j].vy = (balls[j].vy * (balls[j].mass - balls[i].mass) + (2 * balls[i].mass * balls[i].vy)) / (balls[i].mass + balls[j].mass);
          balls[i].vx = ax;
          balls[i].vy = ay;
        }
      }
    }

    raf = window.requestAnimationFrame(draw);
  }


  function onBoxTouched() {

    for (var i = 0; i < ballCount; i++) {

      if (balls[i].x + balls[i].radius > 600 && balls[i].x + balls[i].radius < 750 &&
        balls[i].y + balls[i].radius > 200 && balls[i].y + balls[i].radius < 350) {

        ele.style.backgroundColor = balls[i].color;

        balls.splice(i, 1);
        ballCount = ballCount - 1;

        if (ballCount == 0) {
          ele.style.fontSize = "x-large";
          ele.innerHTML = "Over";
        } else {
          ele.innerHTML = ballCount;
        }
      }
    }
  }

  window.requestAnimationFrame(draw);

  window.addEventListener('resize', resizeCanvas, false);

  function resizeCanvas() {
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight / 1.2;
  }

}

* {}

html,
body {}

canvas {
  border: 1px solid black;
  border-radius: 5px;
  background-color: #fff;
  width: calc(100% - 40px);
  margin: auto 20px auto 20px;
}

#box {
  width: 150px;
  height: 150px;
  background-color: plum;
  border-radius: 5px;
  position: absolute;
  top: 200px;
  left: 600px;
  font-size: 72px;
  font-weight: bold;
  color: white;
  line-height: 150px;
  text-align: center;
}

#info {
  float: left;
  font-size: 24px;
  color: #6D8390;
  margin-top: 20px;
}

<body onload="start()">
  <canvas id="myCanvas"></canvas>
</body>

Hope this solution works for you :)

Answer 5

Answer №3

Instead of playing with margins, consider adjusting the width of your canvas and centering it for a cleaner look.

CSS

canvas {
  border: 1px solid black;
  border-radius: 5px;
  background-color: #fff;
  width: 90%!important;
}

HTML

<body onload="start()">
  <center>
    <canvas id="myCanvas"></canvas>
  </center>
</body>

https://codepen.io/anon/pen/GEmLPL

Answer 6

Instead of playing with margins, consider adjusting the width of your canvas and centering it for a cleaner look.

CSS

canvas {
  border: 1px solid black;
  border-radius: 5px;
  background-color: #fff;
  width: 90%!important;
}

HTML

<body onload="start()">
  <center>
    <canvas id="myCanvas"></canvas>
  </center>
</body>

https://codepen.io/anon/pen/GEmLPL

Having issues with the right margin in HTML5 canvas and struggling to remove the scroll bar

Answer №1

Answer №2

Answer №3

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