I have noticed that the line chart doesn’t draw the lines with consistent thickness when there are discontinuities in the graph. It looks like some part are re-drawn, or drawn thicker than requested.
A simple way of reproducing the issue, with the realtime example:
https://canvasjs.com/editor/?id=https://canvasjs.com/example/gallery/dynamic/realtime_line/
Change the y value assigned so that there are discontinuities once in a while:
y: ((xVal%100)<5) ? “” :yVal
And set a very narrow line thickness, so that the issue is more noticeable. I actually noticed it with lineThickness = 1, but for the sake of reproducing the error, let’s assign something really small, like 0.01.
lineThickness: 0.01,
The graph should be barely visible, but it is more visible (thicker line) in some parts than in others.
The full html (copy-pasted from the modified example) would be:
<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript">
window.onload = function () {
var dps = []; // dataPoints
var chart = new CanvasJS.Chart("chartContainer",{
title :{
text: "Live Random Data"
},
data: [{
type: "line",
lineThickness: 0.01,
dataPoints: dps
}]
});
var xVal = 0;
var yVal = 100;
var updateInterval = 20;
var dataLength = 500; // number of dataPoints visible at any point
var updateChart = function (count) {
count = count || 1;
// count is number of times loop runs to generate random dataPoints.
for (var j = 0; j < count; j++) {
yVal = yVal + Math.round(5 + Math.random() *(-5-5));
dps.push({
x: xVal,
y: ((xVal%100)<5) ? "" :yVal
});
xVal++;
};
if (dps.length > dataLength)
{
dps.shift();
}
chart.render();
};
// generates first set of dataPoints
updateChart(dataLength);
// update chart after specified time.
setInterval(function(){updateChart()}, updateInterval);
}
</script>
<script type="text/javascript" src="https://cdn.canvasjs.com/canvasjs.min.js"></script>
</head>
<body>
<div id="chartContainer" style="height: 300px; width:100%;">
</div>
</body>
</html>
PS. Congratulations on the library. It is very simple, lightweight, and powerful at the same time.
.
