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Line Styles for Lines and Strokes

Published : November 17, 2014   •   Last Edited : November 24, 2025   •   Author : Adam Khoury
In this third exercise we will focus on line styles. There are several properties in JavaScript available that allow us to manipulate the way lines and strokes appear on our canvas element. Create dashed lines, offset dashes, miter effects, rounded effects and more. 
<!DOCTYPE html>
<html>
<head>
<style>
body{ margin:40px; background:#666; }
#canvas1{ background:#FFF; border:#000 1px solid; }
</style>
<script>
function draw() {
    var canvas = document.getElementById("canvas1");
    var ctx = canvas.getContext("2d");
    ctx.beginPath();
    ctx.lineWidth = 20;
    ctx.lineCap = "round"; // butt, round, square
    ctx.lineJoin = "miter"; // bevel, round, miter
    ctx.miterLimit = 2;
    ctx.setLineDash([20,10,30,10,40,10]);
    ctx.lineDashOffset = 10;
    ctx.moveTo(150,150);
    ctx.lineTo(240,240);
    ctx.lineTo(240,40);
    ctx.stroke();
}
window.onload = draw;
</script>
</head>
<body>
<canvas id="canvas1" width="500" height="400"></canvas>
</body>  
</html>
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