I'm using the last version of chart.js and I want to add a shadow to each bar
Here's an example of code
<canvas id="myChart" width="400" height="400"></canvas>
<script>
var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: ['rgba(255, 99, 132, 0.2)', 'rgba(54, 162, 235, 0.2)', 'rgba(255, 206, 86, 0.2)', 'rgba(75, 192, 192, 0.2)', 'rgba(153, 102, 255, 0.2)', 'rgba(255, 159, 64, 0.2)'],
borderColor: ['rgba(255,99,132,1)', 'rgba(54, 162, 235, 1)', 'rgba(255, 206, 86, 1)', 'rgba(75, 192, 192, 1)', 'rgba(153, 102, 255, 1)', 'rgba(255, 159, 64, 1)'],
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
</script>
This will work for the line chart.
[Edited...]
Chart.types.Line.extend({
name: "LineAlt",
initialize: function () {
Chart.types.Line.prototype.initialize.apply(this, arguments);
var ctx = this.chart.ctx;
var originalStroke = ctx.stroke;
ctx.stroke = function () {
ctx.save();
ctx.shadowColor = '#000';
ctx.shadowBlur = 10;
ctx.shadowOffsetX = 8;
ctx.shadowOffsetY = 8;
originalStroke.apply(this, arguments)
ctx.restore();
}
}
});
var data = {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [
{
fillColor: "rgba(255, 99, 132, 0.2)",
strokeColor: "rgba(54, 162, 235, 0.2)",
pointColor: "rgba(255, 206, 86, 0.2)",
pointStrokeColor: "#fff",
pointHighlightFill: "#fff",
pointHighlightStroke: "rgba(75, 192, 192, 0.2)",
data: [12, 19, 3, 5, 2, 3]
}
]
};
var ctx = document.getElementById("myChart").getContext("2d");
var canvas = new Chart(ctx).LineAlt(data, {
datasetFill: false
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.2/Chart.min.js"></script>
<canvas id="myChart" width="600" height="300"></canvas>
Appreciate if useful
Based on this answer, I created a runnable code snippet that illustrates how to create bars with shadows.
const dataset = [40, 80, 50, 60, 70];
const offset = 8;
Chart.pluginService.register({
afterUpdate: function(chart) {
var metaData = chart.getDatasetMeta(0).data;
for (var i = 0; i < metaData.length; i++) {
var model = metaData[i]._model;
model.x += offset;
model.controlPointNextX += offset;
model.controlPointPreviousX += offset;
}
}
});
var data = {
labels: ["A", "B", "C", "D", "E"],
datasets: [{
backgroundColor: [
'rgba(255, 99, 132)',
'rgba(255, 206, 86)',
'rgba(54, 162, 235)',
'rgba(75, 192, 192)',
'rgba(153, 102, 255)'
],
borderWidth: 1,
data: dataset,
xAxisID: "bar-x-axis1",
categoryPercentage: 0.5,
barPercentage: 0.5,
},
{
backgroundColor: 'rgba(0, 0, 0, 0.2)',
data: dataset.map(v => v + offset),
xAxisID: "bar-x-axis2",
categoryPercentage: 0.5,
barPercentage: 0.5
}
]
};
var options = {
legend: {
display: false
},
tooltips: {
enabled: false
},
scales: {
xAxes: [
{
id: "bar-x-axis2"
},
{
id: "bar-x-axis1",
offset: true,
display: false
}
],
yAxes: [{
id: "bar-y-axis1",
ticks: {
beginAtZero: true,
stepSize: 50
}
}]
}
};
var ctx = document.getElementById("myChart").getContext("2d");
var myBarChart = new Chart(ctx, {
type: 'bar',
data: data,
options: options
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<canvas id="myChart" height="60"></canvas>
Related
Is it possible to make a time interval using Chart.js? As far as I'm concerned, using stacked bars chart is the closest I can get but not quite what I want
What I'm trying to achieve is this time interval
Here's the code
const data = {
labels: ['Mon', 'Tue', 'Wed' ],
datasets: [{
label: 'Bars',
data: [
[14, 16],
[17, 22],
[13, 19],
],
backgroundColor: [
'rgba(255, 26, 104, 0.2)',
],
borderColor: [
'rgba(255, 26, 104, 1)',
],
borderWidth: 2,
borderSkipped: false
}]
};
const config = {
type: 'bar',
data,
options: {
indexAxis: 'y',
scales: {
x: {
min: 12,
max: 26,
ticks: {
stepSize: 1,
callback: (val, index) => {
return `${String(val % 24).padStart(2, '0')}:00`
}
},
},
y: {
beginAtZero: true
}
}
}
};
const myChart = new Chart(
document.getElementById('myChart'),
config
);
You can use horizontalBar for your bar type. Example:
{
type: 'horizontalBar',
data: {
labels: ["a","b","c","d","e","f","g"],
datasets: [{
axis: 'y',
label: 'My First Dataset',
data: [[5,65], [30,90], [20,80], [15,71], [20,56], [24,55], [15,70]],
fill: false,
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(255, 159, 64, 0.2)',
'rgba(255, 205, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(201, 203, 207, 0.2)'
],
borderColor: [
'rgb(255, 99, 132)',
'rgb(255, 159, 64)',
'rgb(255, 205, 86)',
'rgb(75, 192, 192)',
'rgb(54, 162, 235)',
'rgb(153, 102, 255)',
'rgb(201, 203, 207)'
],
borderWidth: 1
}]
},
options: {
indexAxis: 'y',
scales: {
x: {
stacked: true
},
y: {
stacked: true
}
}
}
}
here the result
I hope can help you.
How can I remove opacity from downloaded images using the toBase64Image() function in Chart.js?
If possible, save to JPG instead of PNG.
This is the code:
const myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
y: {
beginAtZero: true
}
},
animation: {
onComplete: function() {
image = graficoConsumo.toBase64Image();
}
}
}
});
document.getElementById('btn-download-chart').onclick = function() {
// Trigger the download
var a = document.createElement('a');
a.href = image;
a.download = 'myChart.png';
a.click();
}
No by default canvases dont have a background so it will always be transparent. To fix this you can write a small custom plugin that draws a white background before chart.js draws its things on it:
Chart.register({
id: 'customBackground',
beforeDraw: (chart, args, opts) => {
const ctx = chart.canvas.getContext('2d');
ctx.save();
ctx.globalCompositeOperation = 'destination-over';
ctx.fillStyle = 'white';
ctx.fillRect(0, 0, chart.width, chart.height);
ctx.restore();
}
})
const options = {
type: 'line',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderColor: 'orange'
},
{
label: '# of Points',
data: [7, 11, 5, 8, 3, 7],
borderColor: 'pink'
}
]
},
options: {},
}
const ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
body {
background-color: black;
}
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.6.2/chart.js"></script>
</body>
Vertical bar chart:
I want to achieve this vertical bar chart image in the link above but the result of my code is displaying a normal bar chart. Here is a snippet of the code I'm using to generate the chart:
<template name="VerticalCharts">
<div class="profile-user-box">
<canvas id="myCharts"></canvas>
</div>
</template>
Template.VerticalCharts.onRendered(function() {
var ctx = document.getElementById('myCharts').getContext('2d');
var myCharts = new Chart(ctx, {
type: 'bar',
data: {
labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
responsive: true,
plugins: {
legend: {
position: 'top',
},
title: {
display: true,
text: 'Chart.js Bar Chart'
}
}
},
});
});
What you have is a vertical bar chart, if you want horizontal bars you need to set the indexAxis to 'y' in your options object like so:
var options = {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderWidth: 1
}]
},
options: {
indexAxis: 'y'
}
}
var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
<canvas id="chartJSContainer" width="600" height="400"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.5.1/chart.js"></script>
</body>
How to convert a bar chart into a triangle shaped chart using Chart JS ?
For eg: Sample Bar Chart : How to convert it into triangles instead of bars ?
var ctx = document.getElementById('myChart');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255, 99, 132, 1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
y: {
beginAtZero: true
}
}
}
});
You can use a scatter chart and define individual datasets for each value.
Please take a look at your amended code and see how it works.
const labels = ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'];
const data = [12, 19, 3, 5, 2, 3];
const colors = ['255, 99, 132', '54, 162, 235', '255, 206, 86', '75, 192, 192', '153, 102, 255', '255, 159, 64'];
const datasets = labels.map((l, i) => ({
label: l,
data: [{ x: i + 1 - 0.45, y: 0 }, { x: i + 1, y: data[i] }, { x: i + 1 + 0.45, y: 0 }],
fill: true,
backgroundColor: 'rgba(' + colors[i] + ', 0.2)',
borderColor: 'rgb(' + colors[i] + ')',
showLine: true,
borderWidth: 1,
lineTension: 0,
pointRadius: 0,
pointHitRadius: 0
}));
new Chart('myChart', {
type: 'scatter',
data: {
datasets: datasets
},
options: {
scales: {
y: {
beginAtZero: true
},
x: {
min: 0,
max: labels.length + 1,
ticks: {
callback: (v, i) => labels[i - 1]
},
grid: {
display: false
}
}
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.3.2/chart.min.js"></script>
<canvas id="myChart" height="110"></canvas>
You will have to implement your own custom chart type to do this since it's not possible by default, you can read here in the documentation how to implement your own chart type: https://www.chartjs.org/docs/master/developers/charts.html
I have a chart.js chart in my app. This is how it looks without negative values:
With negative values:
As you can see I have dual axisY. They work as needed if there are no negative values. But if there are some, right AxisY starts in the incorrect position.
How to make it starts in the same place as left AxisY?
Here is my code:
private buildOptions(): any {
return {
responsive: true,
title: {
display: false,
text: ''
},
tooltips: {
mode: 'index',
intersect: true
},
scales: {
yAxes: [{
position: "left",
id: "y-axis-0",
fontColor: '#fff'
}, {
position: "right",
id: "y-axis-1",
fontColor: '#fff'
}]
},
legend: {
display: true,
labels: {
fontColor: '#fff'
}
}
};
}
Thank you.
Have you tried setting the same min value for both axes?
You can use ticks for specifying it:
ticks: {
min: -5
}
Here's an example snippet I made for you:
var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, -5, 3, 5, 2, -3],
backgroundColor: [
'rgba(255, 99, 132, 0.2)',
'rgba(54, 162, 235, 0.2)',
'rgba(255, 206, 86, 0.2)',
'rgba(75, 192, 192, 0.2)',
'rgba(153, 102, 255, 0.2)',
'rgba(255, 159, 64, 0.2)'
],
borderColor: [
'rgba(255,99,132,1)',
'rgba(54, 162, 235, 1)',
'rgba(255, 206, 86, 1)',
'rgba(75, 192, 192, 1)',
'rgba(153, 102, 255, 1)',
'rgba(255, 159, 64, 1)'
],
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
position: "left",
id: "y-axis-0",
fontColor: '#fff',
ticks: {
min: -5
}
}, {
position: "right",
id: "y-axis-1",
fontColor: '#fff',
ticks: {
min: -5
}
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.bundle.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div style="width:50%;">
<canvas id="myChart" width="400" height="400"></canvas>
</div>