HTML5 canvas Rect Tutorial

To create a rectangle with Konva, we can instantiate a Konva.Rect() object.

For a full list of attributes and methods, check out the Konva.Rect documentation.

You can define corner radius for Konva.Rect. It can be simple number or array of numbers [topLeft, topRight, bottomRight, bottomLeft].

Konva Rect Demoview raw

<!DOCTYPE html>
<html>
  <head>
    <script src="https://unpkg.com/[email protected]/konva.min.js"></script>
    <meta charset="utf-8" />
    <title>Konva Rect Demo</title>
    <style>
      body {
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #f0f0f0;
      }
    </style>
  </head>
  <body>
    <div id="container"></div>
    <script>
      var width = window.innerWidth;
      var height = window.innerHeight;

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

      var layer = new Konva.Layer();

      var rect1 = new Konva.Rect({
        x: 20,
        y: 20,
        width: 100,
        height: 50,
        fill: 'green',
        stroke: 'black',
        strokeWidth: 4,
      });
      // add the shape to the layer
      layer.add(rect1);

      var rect2 = new Konva.Rect({
        x: 150,
        y: 40,
        width: 100,
        height: 50,
        fill: 'red',
        shadowBlur: 10,
        cornerRadius: 10,
      });
      layer.add(rect2);

      var rect3 = new Konva.Rect({
        x: 50,
        y: 120,
        width: 100,
        height: 100,
        fill: 'blue',
        cornerRadius: [0, 10, 20, 30],
      });
      layer.add(rect3);

      // add the layer to the stage
      stage.add(layer);
    </script>
  </body>
</html>

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