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JavaScript - draw polygon on canvas element in HTML5

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1 points

Simple solution:

context.beginPath();
context.moveTo(20, 40);   // point 1
context.lineTo(70, 150);  // point 2
context.lineTo(110, 80);  // point 3
context.lineTo(180, 170); // point 4
context.lineTo(150, 70);  // point 5
context.closePath();      // go back to point 1
context.stroke();

 

Using JavaScript it is possible to draw polygon in following way.

1. lineTo(), closePath() and stroke() methods example

In this example it has been shown how to draw stroke / border of polygon. Read this article how to fill polygon with certain color.

// 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 drawPolygon(points) {
        if (points.length > 0) {
            var point = points[0];
          
            context.beginPath();
            context.moveTo(point.x, point.y);   // point 1
            
            for (var i = 1; i < points.length; ++i) {
                point = points[i];
              
                context.lineTo(point.x, point.y);
            }
            
            context.closePath();      // go back to point 1
            context.stroke();
        }
    }

    var points = [ 
        {x: 20, y: 40},
        {x: 70, y: 150},
        {x: 110, y: 80},
        {x: 180, y: 170},
        {x: 150, y: 70}
    ];

    drawPolygon(points);

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

Merged questions

  1.  How to draw polygon border on HTML5 canvas in JavaScript?
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