Implement Color-Coded Ranges in Chart Bars
Environment
| Product | Progress® Kendo UI® Chart for jQuery |
| Operating System | Windows 10 64bit |
| Visual Studio Version | Visual Studio 2017 |
| Preferred Language | JavaScript |
Description
How can I implement color-coded ranges in the bars of the Chart?
Solution
You can use color ranges for conveying additional information, for example, value composition.
To achieve this behavior, you can normally use the stacked bar series. However, if you need to convey more flexibility, consider the following Chart.
To implement the functionality as shown in the image, define a series.visual that draws the ranges dynamically. Note that the visual remains in use until the next render event. This allows you to update it asynchronously or in real-time.
The following example demonstrates how to implement color-coded ranges (stripes) in bars when working with Kendo UI Charts.
<div id="chart" />
<script>
var WIDTH = 5;
var draw = kendo.drawing;
var geom = kendo.geometry;
$("#chart").kendoChart({
series: [{
type: "bar",
data: [10, 20, 30],
// https://docs.telerik.com/kendo-ui/api/javascript/dataviz/ui/chart/configuration/series.visual
visual: function(e) {
// https://docs.telerik.com/kendo-ui/api/javascript/geometry/rect
var left = e.rect.topLeft();
var right = e.rect.topRight();
var bottom = e.rect.bottomLeft();
// https://docs.telerik.com/kendo-ui/api/javascript/drawing/group
var group = new draw.Group();
for (var x = left.x; x < right.x; x += WIDTH) {
var rect = new geom.Rect([x, left.y], [WIDTH, e.rect.height()])
// https://docs.telerik.com/kendo-ui/api/javascript/drawing/path
var value = Math.random();
var path = draw.Path.fromRect(rect, {
fill: {
color: value > 0.5 ? "green" : "lightgreen"
},
stroke: null,
// Custom field
value: value
});
group.append(path);
}
return group;
}
}]
});
</script>