javascriptchart.jschartjs-2.6.0
You can check snippet in order to see example and how far I got.
Find intersection between the chart lines in chartjs
I am trying to create a line chart that presents score level from 1-100.
Line is static and needs to be curved
but the dot on the chart is dynamic value and by that it changes its location along the existing line.
First I was thinking to add additional data that represents only the dot itself, but Y(height) is unknown.
Second attempt led me to create a second line that crosses / intersects the first one in hope of finding intersection point and making it a dot.
Unfortunately, I couldn't find a way to locate intersection.
This is expected result.
new Chart(
document.getElementById('lineChart'), {
type: 'line',
data: {
datasets: [
{
data: [
{
x: 70, y: 0,
},
{
x: 70, y: 100,
}],
fill: false,
borderColor: 'red',
showLine:true,
},
{
data: [
{
x: 0, y: 2,
},
{
x: 25, y: 10,
},
{
x: 50, y: 50,
},
{
x: 80, y: 90,
},
{
x: 100, y: 98,
}],
startWithZero: true,
fill: false,
lineTension: 0.3,
borderColor: 'blue',
}
]
},
options: {
bezierCurve : true,
lineTension: 0.3,
tooltips: {
mode: 'intersect'
},
scales: {
xAxes: [{
type: 'linear',
ticks: {
min: 0, //minimum tick
max: 100, //maximum tick
},
}],
yAxes: [{
ticks: {
bezierCurve : true,
min: 0, //minimum tick
max: 100, //maximum tick
},
bezierCurve : true,
type: 'linear',
lineTension: 0.3,
scaleLabel: {
lineTension: 0.1,
display: true,
}
}]
}
}
})<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0/Chart.min.js"></script>
<body>
<div style="width: 750px; height: 250px; margin: 0 auto;">
<canvas style="width: 750px; height: 250px" id="lineChart"></canvas>
</div>
</body>Solution
Can you try to create dynamic values
const lineData = [
{ x: 0, y: 2 },
{ x: 10, y: 3 },
{ x: 20, y: 10 },
{ x: 30, y: 20 },
{ x: 40, y: 35 },
{ x: 50, y: 50 },
{ x: 60, y: 65 },
{ x: 70, y: 80 },
{ x: 80, y: 90 },
{ x: 90, y: 97 },
{ x: 100, y: 98 },
];
const xValue = 70;
let key = Math.floor(xValue / 10);
let diff = (lineData[key + 1].y - lineData[key].y) / 10;
let toAdd = (xValue - lineData[key].x) * diff;
const yValue = lineData[key].y + toAdd;
And include dynamic values in chartJs code
new Chart(
document.getElementById('lineChart'), {
type: 'line',
data: {
datasets: [
{
data: lineData,
startWithZero: true,
fill: false,
lineTension: 0.3,
borderColor: 'blue',
}
]
},
options: {
bezierCurve : true,
lineTension: 0.3,
tooltips: {
mode: 'intersect'
},
scales: {
xAxes: [{
type: 'linear',
ticks: {
min: 0, //minimum tick
max: 100, //maximum tick
},
}],
yAxes: [{
ticks: {
bezierCurve : true,
min: 0, //minimum tick
max: 100, //maximum tick
},
bezierCurve : true,
type: 'linear',
lineTension: 0.3,
scaleLabel: {
lineTension: 0.1,
display: true,
}
}]
}
}
})
const lineData = [
{ x: 0, y: 2 },
{ x: 10, y: 3 },
{ x: 20, y: 10 },
{ x: 30, y: 20 },
{ x: 40, y: 35 },
{ x: 50, y: 50 },
{ x: 60, y: 65 },
{ x: 70, y: 80 },
{ x: 80, y: 90 },
{ x: 90, y: 97 },
{ x: 100, y: 98 },
];
const xValue = 70;
let key = Math.floor(xValue / 10);
let diff = (lineData[key + 1].y - lineData[key].y) / 10;
let toAdd = (xValue - lineData[key].x) * diff;
const yValue = lineData[key].y + toAdd;
new Chart(
document.getElementById('lineChart'), {
type: 'line',
data: {
datasets: [
{
data: lineData,
startWithZero: true,
fill: false,
lineTension: 0.3,
borderColor: 'blue',
}
]
},
options: {
bezierCurve : true,
lineTension: 0.3,
tooltips: {
mode: 'intersect'
},
scales: {
xAxes: [{
type: 'linear',
ticks: {
min: 0, //minimum tick
max: 100, //maximum tick
},
}],
yAxes: [{
ticks: {
bezierCurve : true,
min: 0, //minimum tick
max: 100, //maximum tick
},
bezierCurve : true,
type: 'linear',
lineTension: 0.3,
scaleLabel: {
lineTension: 0.1,
display: true,
}
}]
}
}
})<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.8.0/Chart.min.js"></script>
<body>
<div style="width: 750px; height: 250px; margin: 0 auto;">
<canvas style="width: 750px; height: 250px" id="lineChart"></canvas>
</div>
</body>- how can i get element height in javascript
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