HTML5 Game - Canvas Shape Spiral

Drawing a spiral

The following code shows how to draw a spiral by connecting a series of short lines to form a spiral path.

Demo

<html>
    <head>
        <script>
            window.onload = function(){
                let canvas = document.getElementById("myCanvas");
                let context = canvas.getContext("2d");
                //from   w w  w.  j  av  a 2s  .  c  o m
                let radius = 0;
                let angle = 0;
                
                context.lineWidth = 10;
                context.strokeStyle = "#0096FF";
                context.beginPath();
                context.moveTo(canvas.width / 2, canvas.height / 2);
                
                for (let n = 0; n < 180; n++) {
                    radius += 0.75;
                    // make a complete circle every 50 iterations
                    angle += (Math.PI * 2) / 50;
                    let x = canvas.width / 2 + radius * Math.cos(angle);
                    let y = canvas.height / 2 + radius * Math.sin(angle);
                    context.lineTo(x, y);
                }
                
                context.stroke();
            };
        </script>
    </head>
    <body>
        <canvas id="myCanvas" width="600" height="250" style="border:1px solid black;">
        </canvas>
    </body>
</html>

Note

To draw a spiral, place our drawing cursor in the center of the canvas.

And then iteratively increase the radius and angle about the center.

Draw a short line from the previous point to the current point.