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JavaScript - set lineCap property on canvas

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Created by:
Brandy-Mccabe
514

In this article, we would like to show you how to set lineCap property while drawing on canvas using JavaScript.

Quick solution:

context.lineCap = 'round'; // 'square' or 'butt' (default)


// Usage example:

context.lineWidth = 20;
context.beginPath();
context.moveTo(10, 50);
context.lineTo(10, 100);
context.stroke();

drawLine();

 

Overview

JavaScript - set lineCap property on canvas
JavaScript - set lineCap property on canvas

Practical example

In this example, we present three lines with different lineCap property values.

// ONLINE-RUNNER:browser;

<!doctype html>
<html>
<head>
  <style>

    #my-canvas { border: 1px solid gray; }

  </style>
</head>
<body>
  <canvas id="my-canvas" width="200" height="200"></canvas>
  <script>

    var canvas = document.querySelector('#my-canvas');
    var context = canvas.getContext('2d');

    function drawLine() {

        context.lineWidth = 20;

        // line 1
        context.lineCap = 'butt'; // <--- (default)
        context.beginPath();
        context.moveTo(50, 50);
        context.lineTo(50, 150);
        context.stroke();

        // line 2
        context.lineCap = 'square'; // <---
        context.beginPath();
        context.moveTo(100, 50);
        context.lineTo(100, 150);
        context.stroke();

        // line 3
        context.lineCap = 'round'; // <---
        context.beginPath();
        context.moveTo(150, 50);
        context.lineTo(150, 150);
        context.stroke();
    }

    drawLine();

  </script>
</body>
</html>

References

  1. CanvasRenderingContext2D.lineCap - Web APIs | MDN

Alternative titles

  1. JavaScript - set line ending on canvas
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JavaScript - HTML5 canvas tutorial

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