HTML5 canvas Line Tutorial

To create a line with Konva, we can instantiate a Konva.Line() object.

For a full list of attributes and methods, check out the Konva.Line documentation.

Konva Line Demoview raw
<!DOCTYPE html>
<html>
<head>
<script src="https://cdn.rawgit.com/konvajs/konva/1.6.3/konva.min.js"></script>
<meta charset="utf-8">
<title>Konva Simple Line 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 redLine = new Konva.Line({
points: [5, 70, 140, 23, 250, 60, 300, 20],
stroke: 'red',
strokeWidth: 15,
lineCap: 'round',
lineJoin: 'round'
});
// dashed line
var greenLine = new Konva.Line({
points: [5, 70, 140, 23, 250, 60, 300, 20],
stroke: 'green',
strokeWidth: 2,
lineJoin: 'round',
/*
* line segments with a length of 33px
* with a gap of 10px
*/
dash: [33, 10]
});
// complex dashed and dotted line
var blueLine = new Konva.Line({
points: [5, 70, 140, 23, 250, 60, 300, 20],
stroke: 'blue',
strokeWidth: 10,
lineCap: 'round',
lineJoin: 'round',
/*
* line segments with a length of 29px with a gap
* of 20px followed by a line segment of 0.001px (a dot)
* followed by a gap of 20px
*/
dash: [29, 20, 0.001, 20]
});
/*
* since each line has the same point array, we can
* adjust the position of each one using the
* move() method
*/
redLine.move({
x : 0,
y : 5
});
greenLine.move({
x : 0,
y : 55
});
blueLine.move({
x : 0,
y : 105
});
layer.add(redLine);
layer.add(greenLine);
layer.add(blueLine);
// add the layer to the stage
stage.add(layer);
</script>
</body>
</html>