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Support XYDataPoint support in LineDataSet #489
Description
Checklist
- I made sure that there are no existing issues - open or closed - which I could contribute my information to.
- I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
- This issue contains only one feature request/enhancement.
Description
Support XYDataPoint support in LineDataSet to be able to model a ChartJs graph like:
https://jsfiddle.net/escay/y9j3x5cf/6/
for Time series with non equidistant date values. In pull request #488 you can see an example of how it might work. Although I am not sure if introducing new XYLineDataSet classes would be desired as a solution.
Relevant ChartJs documentation: https://www.chartjs.org/docs/latest/axes/cartesian/time.html where line dataset can contain XYDataPoints:
let chart = new Chart(ctx, {
type: 'line',
data: {
datasets: [{
data: [{
x: '2021-11-06 23:39:30',
y: 50
}, {
x: '2021-11-07 01:00:28',
y: 60
}, {
x: '2021-11-07 09:00:28',
y: 20
}]
}],
},
Full example of the goal, but using epoch timestamps to let ChartJs do the timezone conversion of the x axis:
{
"data": {
"datasets": [
{
"backgroundColor": "rgba(40, 180, 99, 0.3)",
"borderColor": "rgb(40, 180, 99)",
"borderWidth": 1,
"data": [
{
"x": 1699457269877,
"y": 20
},
{
"x": 1700047109694,
"y": 20
}
],
"hidden": false,
"label": "Device Id: 524967 Register: A- total Wh",
},
{
"backgroundColor": "rgba(218, 117, 255, 0.3)",
"borderColor": "rgb(218, 117, 255)",
"borderWidth": 1,
"data": [
{
"x": 1699457267847,
"y": 10
},
{
"x": 1700047108397,
"y": 234
}
],
"hidden": false,
"label": "Device Id: 524967 Register: A+ total Wh",
}
]
},
"options": {
"plugins": {
"legend": {
"display": true,
"fullWidth": true,
"position": "top",
"reverse": false,
"rtl": false
},
"title": {
"display": true,
"text": "Values from the meter"
}
},
"scales": {
"x": {
"beginAtZero": false,
"offset": true,
"reverse": false,
"stacked": true,
"ticks": {
"autoSkip": true,
"maxRotation": 0,
"minRotation": 0,
"mirror": false,
"source": "data"
},
"time": {
"displayFormats": {
"minute": "dd.LL T"
},
"round": "minute",
"stepSize": "60",
"unit": "minute"
},
"type": "time"
},
"y": {
"beginAtZero": false,
"offset": false,
"reverse": false,
"stacked": true,
"ticks": {
"autoSkip": true,
"mirror": false
}
}
},
"showLine": true,
"spanGaps": false
},
"type": "line"
}
Additional information
No response
Activity
AB-xdev commentedon Sep 22, 2026
Hi, sorry for the late response.
After having a look at the PR (kind of confusing that a JUnit Tests opens the Desktop),I think what you want to do can already be done using
addDataUncheckedon a LineChart.AB-xdev commentedon Sep 22, 2026
I added a dedicated simplistic test (that does not open the system's browser)