I'm logging sensor data into a SQL table that looks like this
Picture of the table for clarity
I'm processing the data intro arrays like this
$value1 = json_encode(array_reverse(array_column($sensor_data, 'value1')), JSON_NUMERIC_CHECK);
I'm processing datetime like this
$reading_time = json_encode(array_reverse($readings_time), JSON_NUMERIC_CHECK);
I managed to graph the data into a regular highcharts line graph. And for xAxis/time I used
xAxis: {
type: 'datetime',
categories: reading_time },
I want to graph the data using HighStocks so I'm able to use the navigator etc.
I can't find a way to pass the $reading_time to the x-axis. Do I need to format in a specific way?
Any sample code will be appreciated.
You can not use datetime and category axis type at the same time. Moreover, you can not use categories for Highstock at all. You should provide the date values as timestamps in miliseconds for x data property, for example:
data: [
// x, y
[1584014486654, 1],
[1584014496957, 2],
[1584014502349, 8]
]
API Reference: https://api.highcharts.com/highstock/series.line.data
Live example: http://jsfiddle.net/BlackLabel/6m4e8x0y/4904/
Related
I have a Kendo Chart bound to a data model which is receiving a list of different points. The category axis is a date axis in which the maximum and minimum value are bound to the model. Always the span for the category axis is one whole year (12 months, not necessarily beginning from January).
The code for the axis is as follows:
.CategoryAxis(axis => axis
.Labels(labels => labels.Rotation(0).Format("MMM ‘yy"))
.Date().Min(Model.StartDate).Max(Model.EndDate).Justify(false)
)
The category axis renders correctly when I have more than 1 data point present in the chart, however when I have just one datapoint the category axis becomes a mess (all the labels become stacked and repeated).
i was wondering if there is a way to specify a mandatory number of ticks to the axis as to always have just 12 ticks corresponding to each month.
Thanks
Luis.
The only to have all the ticks is to append your data of chart with null values of missing months. So when you have got one data point you need to append other data point with null values but remaining other months. Please see below sample code:
<div id="kk"></div>
<script>
var _data=[{"weight":200,"createddate":"1/1/2014"},
{"weight":200,"createddate":"2/1/2014"},
{"weight":200,"createddate":"3/1/2014"},
{"weight":149.91,"createddate":"4/1/2014"},
{"weight":null,"createddate":"5/1/2014"},
{"weight":null,"createddate":"6/1/2014"},
{"weight":null,"createddate":"7/1/2014"},
{"weight":null,"createddate":"8/1/2014"},
{"weight":null,"createddate":"9/1/2014"},
{"weight":null,"createddate":"10/1/2014"},
{"weight":null,"createddate":"11/1/2014"},
{"weight":null,"createddate":"12/1/2014"}]
$("#kk").kendoChart({
dataSource: {
data:_data
},
seriesColors: ["Red"],
seriesDefaults: {
type: "column",
},
series: [{
name: "weight",
field: "weight",
categoryField: "createddate",
}],
categoryAxis: {
type: "date",
baseUnit: "months"
}
});
</script>
Please find a JSFiddle for the same.
This way when you get your JSON Data from Controller, either you can update the JSON Data at Controller Side and Append Missing Data Points with null value or else you can do it in javascript as well once you get the data in the View and before binding it with chart.
I would like to create a Waterfall graph using Highcharts, but I would like to use a COLUMN type graph, as I need custom tooltips shown on the sum and intermediate sum columns.
The question is:
How can I create a COLUMN graph where I define both the Y-start and the Y-end value?
Use object notation for points:
series: [{
data: [{
y: 20,
low: 10
}]
}]
I'm trying to use the type:'datetime' for my x-axis, and am getting a graph on a vertical line and dates going all the way back to 1970. Is there any way to circumvent this error?
Here's my use case: I'm tracking my page performance at regular intervals. if the server goes down for any reason or the metric was unable to be tracked, then we end up with a gap in the line. the requirement is to show this as datetime, but if i populate the series with any null datapoints, Highcharts throws an error 15.
series: [{
data: [
{x:1389254400000,y:10},
{x:1389554400000,y:9},
null,
{x:1389854400000,y:12}]
}]
Here's the fiddle: http://jsfiddle.net/agjZB/23/
If i remove the null datapoint, everything works fine. Thanks for the extra eyes!
You have to make the NULL point the same format as your other points.
Or, don't include it. If you have no data for timestamp x why include it or if you have no data at all why include it?
Example of option 1:
series: [{
data: [
{x:1389254400000,y:10},
{x:1389554400000,y:9},
{x:1389554400000,y:null},
{x:1389854400000,y:12}]
}]
For line chart you shouldn't use points with the same x value, becasue a few feateaures like tooltip will not work correct. You need to set scatter type and lineWidth as 2.
i got a pool of data with exact same value in a scatter plot with HighCharts as in :
http://jsfiddle.net/DvbHa/1/
i want to be able to display them in tooltip when i go over it to be able to click them individualy
is something like that possible?
Thx all
Code:
$(function () {
$('#container').highcharts({
chart: {
type: 'scatter',
zoomType: 'xy'
},
title: {
text: ''
},
tooltip: {
headerFormat: '<b>{series.name}</b><br>',
pointFormat: '{point.x}, {point.y}'
},
series: [{
data: [[10, 5],
[15, 6],
[10, 5],
[15, 7],
[13, 6],
[13, 6]]
}],
});
});
One option that is implemented in most major data visualization software packages is jittering - a function that adds small amounts of random noise to the data points so that each data point is slightly offset from it's actual data values.
This is a trade off with precision, of course, but those are the kinds of choices that are to be made when displaying data.
There is not a jittering option in Highcharts, but with a little digging you should be able to find or create a solution.
I have had some moderate success doing this on the server side before sending the data to the chart.
First check for any duplicates. If there aren't any, go no further.
If there are, create an array of any duplicate points for any point that has duplicates.
Loop through each array and add random decimal values to the x and y values of each point.
To add click events, use plotOptions.scatter.events.click.
However, I don't know what is the purpose of displaying the same points in the same place with the same value.
Increase size of the plot by using marker radius and you can differentiate the plots at same location.
marker: {
radius: 13
}
http://api.highcharts.com/highcharts/plotOptions.spline.marker.radius
See this one helps or not
Since 7.0.2, HighCharts now does officially support jittering for scatter plots.
See here: https://api.highcharts.com/highcharts/plotOptions.scatter.jitter
I am using highchart, trying to make a chart that shows high and low values for the number of people occupying various rooms. So I have a data like this:
[[roomName, low, high], [roomName, low, high] ...]
For example:
["XRay", 12, 45], ["Waiting Room", 8, 22], ["Admitting", 22, 56]]
What I want to have happen is for the x Axis to use the room names as the values on the category axis. But I can't see to get this to happen. It uses them as the names of the points instead.
If I am just doing a column chart, I can set x and y properties for the points:
[x:"XRay", y:12], [x:"Waiting Room", y:8], [x:"Admitting", y:56]]
But I don't know how I can do this with column ranges.
I can of course manually parse the data and set the categories of the xAxis myself, but I am wondering if there is a better way.
Thanks!
It could be done in two ways, as suggested categories, or using label formatter, both are here: http://jsbin.com/oyudan/17/edit
Formats:
[ {x: 'string' } ... ]
are not proper.