HTML5 Canvas Line Join Tutorial

To set the line join for a shape with Konva, we can set the lineJoin property when we instantiate a shape, or we can use the lineJoin() method.

The lineJoin property can be set to miter, bevel, or round. Unless otherwise specified, the default line join is miter.

Instructions: Mouseover the triangle to change the line join style.

Konva Line Join Demoview raw

<!DOCTYPE html>
<html>
  <head>
    <script src="https://unpkg.com/[email protected]/konva.min.js"></script>
    <meta charset="utf-8" />
    <title>Konva Line Join 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 triangle = new Konva.RegularPolygon({
        x: stage.width() / 2,
        y: stage.height() / 2,
        sides: 3,
        radius: 70,
        fill: 'red',
        stroke: 'black',
        strokeWidth: 20,
        lineJoin: 'bevel',
      });

      triangle.on('mouseover', function () {
        this.lineJoin('round');
      });

      triangle.on('mouseout', function () {
        this.lineJoin('bevel');
      });

      // add the shape to the layer
      layer.add(triangle);

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

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