Drawing-Tool-JavaScript/drawingtool.html at main · KrishnaMahat/Drawing-Tool-JavaScript · GitHub

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<html>
  <head>
    <script src="https://unpkg.com/konva@9/konva.min.js"></script>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
    <meta charset="utf-8" />
    <title>Drawing Tool using Konva JS</title>
    <style>
      body {
        margin: 0;
        padding: 0;
        background-color: #f0f0f0;
      }
      .drawContainer{
        display: flex;
        align-items: center;
        justify-content: center;
        gap:5px;
        padding: 5px;
        margin-top: 5px;
      }
      #tool, #brush-color-picker {
        height:20px;
      }
    </style>
  </head>

  <body>
    <div class="drawContainer">
      Drawing Tool:
      <select id="tool">
        <option value="brush">Brush</option>
        <option value="eraser">Eraser</option>
      </select>
      <input type = "color" id ="brush-color-picker">
      <input type="range" id="width-slider" min="0" max="100" step="1" value="5">
    </div>
    <div id="container"></div>
    <script>
      var brushsize = 5;
      var color = '050505';
      var mode = 'brush';

      $('#brush-color-picker').change(function() {
            context.strokeStyle = $(this).val();
            var color = $(this).val();
            if (mode === 'eraser') {
                $('#container').css({
                    'cursor': 'url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\' fill=\'none\' stroke=\'%23000000\' width=\'' + brushsize + 'px\' height=\'' + brushsize + 'px\' viewBox=\'0 0 10.04 10.04\'><circle cx=\'5.02\' cy=\'5.02\' r=\'4.52\'/></svg>") ' + brushsize / 2 + ' ' + brushsize / 2 + ', auto',
                });
            } else if ((mode === 'brush')) {
                $('#container').css({
                    'cursor': 'url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\' fill=\'%23' + color.substring(1) + '\' width=\'' + brushsize + 'px\' height=\'' + brushsize + 'px\' viewBox=\'0 0 10.04 10.04\'><circle cx=\'5.02\' cy=\'5.02\' r=\'4.52\'/></svg>") ' + brushsize / 2 + ' ' + brushsize / 2 + ', auto',
                });
            }
      });

      $('#width-slider').change(function() {
          brushsize = $(this).val();
          context.lineWidth = brushsize;
          color = $('#brush-color-picker').val().substring(1);
          if (mode === 'eraser') {
              $('#container').css({
                  'cursor': 'url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\' fill=\'none\' stroke=\'%23000000\' width=\'' + brushsize + 'px\' height=\'' + brushsize + 'px\' viewBox=\'0 0 10.04 10.04\'><circle cx=\'5.02\' cy=\'5.02\' r=\'4.52\'/></svg>") ' + brushsize / 2 + ' ' + brushsize / 2 + ', auto',
              });
          } else if (mode === 'brush') {
              $('#container').css({
                  'cursor': 'url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\' fill=\'%23' + color + '\' width=\'' + brushsize + 'px\' height=\'' + brushsize + 'px\' viewBox=\'0 0 10.04 10.04\'><circle cx=\'5.02\' cy=\'5.02\' r=\'4.52\'/></svg>") ' + brushsize / 2 + ' ' + brushsize / 2 + ', auto',
              });
          }
      });

      var width = window.innerWidth;
      var height = window.innerHeight - 25;

      var stage = new Konva.Stage({
        container: 'container',
        width: width,
        height: height,
      });

      var layer = new Konva.Layer();
      stage.add(layer);

      var canvas = document.createElement('canvas');
      canvas.width = stage.width();
      canvas.height = stage.height();

      var image = new Konva.Image({
        image: canvas,
        x: 0,
        y: 0,
      });
      layer.add(image);

      $('#container').css({
          'cursor': 'url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\' fill=\'%23000000\' width=\'' + brushsize + 'px\' height=\'' + brushsize + 'px\' viewBox=\'0 0 10.04 10.04\'><circle cx=\'5.02\' cy=\'5.02\' r=\'4.52\'/></svg>") ' + (brushsize / 2) + ' ' + (brushsize / 2) + ', auto'
      });

      var context = canvas.getContext('2d');
      context.strokeStyle = '#050505';
      context.lineJoin = 'round';
      context.lineWidth = 5;

      var isPaint = false;
      var lastPointerPosition;
      var mode = 'brush';

      image.on('mousedown touchstart', function () {
        isPaint = true;
        lastPointerPosition = stage.getPointerPosition();
      });

      stage.on('mouseup touchend', function () {
        isPaint = false;
      });

      stage.on('mousemove touchmove', function () {
        if (!isPaint) {
          return;
        }

        if (mode === 'brush') {
          context.globalCompositeOperation = 'source-over';
        }
        if (mode === 'eraser') {
          context.globalCompositeOperation = 'destination-out';
        }
        context.beginPath();

        var localPos = {
          x: lastPointerPosition.x - image.x(),
          y: lastPointerPosition.y - image.y(),
        };
        context.moveTo(localPos.x, localPos.y);
        var pos = stage.getPointerPosition();
        localPos = {
          x: pos.x - image.x(),
          y: pos.y - image.y(),
        };
        context.lineTo(localPos.x, localPos.y);
        context.closePath();
        context.stroke();

        lastPointerPosition = pos;
        layer.batchDraw();
      });

      var select = document.getElementById('tool');
        select.addEventListener('change', function () {
            mode = select.value;
            if (mode === 'eraser') {
                $('#container').css({
                    'cursor': 'url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\' fill=\'none\' stroke=\'%23000000\' width=\'' + brushsize + 'px\' height=\'' + brushsize + 'px\' viewBox=\'0 0 10.04 10.04\'><circle cx=\'5.02\' cy=\'5.02\' r=\'4.52\'/></svg>") ' + brushsize / 2 + ' ' + brushsize / 2 + ', auto',
                });
            } else if (mode === 'brush') {
                var color = $('#brush-color-picker').val();
                $('#container').css({
                    'cursor': 'url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\' fill=\'%23' + color.substring(1) + '\' width=\'' + brushsize + 'px\' height=\'' + brushsize + 'px\' viewBox=\'0 0 10.04 10.04\'><circle cx=\'5.02\' cy=\'5.02\' r=\'4.52\'/></svg>") ' + brushsize / 2 + ' ' + brushsize / 2 + ', auto',
                });
            }
        });
    </script>
  </body>
</html>