Setting up a line chart with line series and a horizontal selection brush (lineX) doesn't seem to provide a way of reading the selected range values. Changing the series type to bar or scatter seems to work as expected. I'm wondering if this is a bug or if more configurations are required.
var container = document.getElementById('main');
var chart = echarts.init(container);
chart.setOption({
xAxis: {
data: [3, 4, 5]
},
yAxis: {
},
brush: {
toolbox: ['lineX'],
type: 'lineX',
},
series: [{
type: 'line', // changing this to scatter or other types makes the brush selection work
data: [120, 200, 150]
}]
});
chart.on('brushSelected', function(params){
// this shows an empty array - while it should be the range selected
console.log(params.batch[0].selected[0].dataIndex)
});
#main {
width: 600px;
height: 400px;
border: 1px solid red;
}
<html>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/echarts/5.0.2/echarts.min.js"></script>
<div id="main"></div>
</body>
</html>
Currently, supported brush types include: scatter, bar, candlestick. (Note that parallel contains brush function by itself, which is not provided by brush component.)
https://echarts.apache.org/en/option.html#brush
Related
I'm trying to create a scatter-plot chart in chart.js mixing a line chart and a bubble chart to graph the dispersion of some data vs the "ideal" of a predictive math model.
I'm using the scales to scatter the xAxes and make a straight line (which represents the "ideal"). The problem is in the bubble chart, the data of bubble can't be exactly over the line, is technically impossible (in theory), but they are exactly over the "ideal" line.
Here is my example code for the chart:
var chart = new Chart(ctx, {
type: 'bubble',
data: {
labels: makeLabels().labels,
datasets: [
{
type: 'line',
label: 'Data',
data: makeLabels().labels,
fill: false,
backgroundColor: "rgba(218,83,79, .7)",
borderColor: "rgba(218,83,79, .7)",
pointRadius: 0
},
{
type: 'bubble',
label: 'Data2',
data: makeBubbles(),
backgroundColor: "rgba(76,78,80, .7)",
borderColor: "transparent"
}
]
},
options: {
scales: {
xAxes: [{
type: 'linear',
position: 'bottom',
ticks: {
min: 0,
max: Math.max(...makeLabels().array)
}
}]
}
}
});
And here is the complete code with the dummie data and the playground in codepen.
Anyway, this is the actual result:
And this is the expected result:
The position of the line is irrelevant (the charts in the captures aren't plotted with the same data), but what i want is to cause the bubbles to disperse.
¿Any idea how to achieve it?
The reason your points are coming out linearly is because you are setting each data point's x and y value to be the same in makeBubbles(). This results in points that are positioned linearly.
To get the points to scatter just use point that don't fall into a linear pattern. To demonstrate what I mean, I have modified your makeBubbles() function so that your x and y values aren't equal. Now you get a very broad scatter.
arr = arr.map(function(item, i) {
return {x: item, y:arr[i - 1]}
});
Here is an example.
I have a couple of pie/doughnut charts displayed using ChartJS. Usually, they contain data like [200, 1200, 300] and [30, 500] to give an estimate, but at rare occasions, they will contain [0, 0, 0] and [0, 0]. The problem then, is that the chart disappears, even though I have a border enabled. I have solved this by adding dummy values to the first element in the arrays, but I don't like how the code looks and want a better way.
Is it possible to make the border visible (a circle) when the array contains only zeroes?
Edit:
I don't seem to get any answers to this question. Is it considered a bug when the border is not showing on empty data or is this intended behavior? I don't know if anyone else has had this problem. I still need to find an elegant way to deal with this issue, and I haven't found one yet.
This is not a bug, as the borders are rendered per data item. If all the data is 0s, then every slice has no width, so no border can show (the only other way to handle this scenario for ChartJS would be to give each item equal sizing, which isn't better).
You can add a dummy value without a label and filter the legend and tooltips so that the data is treated like a blank space to the user. In the example below, a check before rendering the chart ensures that if all data points are 0, a data point with a value of 1 is added to the chart with no label. Two datasets are shown to highlight the difference.
let ctx = document.getElementById('chartContainer').getContext('2d');
let data = [[0, 0, 0], [1,2,3]];
let labels = ["A", "B", "C"];
let bgColors = ['yellow', 'orange', 'aquamarine'];
let options = {
borderWidth: 1,
borderColor: 'black',
legend: {
labels: {
// Prevent items with undefined labels from appearing in the legend
filter: (item) => item.text !== undefined
}
},
tooltips: {
// Prevent items with undefined labels from showing tooltips
filter: (item, chart) => chart.labels[item.index] !== undefined
}
}
let chartConfig = {
type: 'pie',
data: {
labels: labels,
datasets: [{
data: data[0],
backgroundColor: bgColors,
label: "data",
borderColor: 'black',
borderWidth: 2
}, {
data: data[1],
backgroundColor: bgColors,
label: "data",
borderColor: 'black',
borderWidth: 2
}]
},
options: options
}
// Check if data is all 0s; if it is, add dummy data to end with empty label
chartConfig.data.datasets.forEach(dataset => {
if (dataset.data.every(el => el === 0)) {
dataset.backgroundColor.push('rgba(255,255,255,0)');
dataset.data.push(1);
}
})
let pieChart = new Chart(ctx, chartConfig);
.chartContainer {
height: 200px;
width: 200px;
}
<script src="https://cdn.jsdelivr.net/npm/chart.js#2.8.0/dist/Chart.min.js"></script>
<div class="chartContainer">
<canvas id="chartContainer" width="200" height="200"></canvas>
</div>
I'm trying to find a way of hiding the grid lines that extend beyond the max value of the axis (see image below for reference).
And the same for the X-Axis of course. I essentially just want the lines to stop at the max tick value. I've scoured the documentation but no avail so hoping the good people of SE will be able to suggest a solution.
What version are you using? My bar chart in v 2.5.0 doesn't extend above
It does have the optional 'padding' argument:
window.myBarChart = new Chart(ctx, {
type: 'bar',
data: barChartData,
options: {
elements: {
rectangle: {
borderWidth: 2,
}
},
layout: {
padding: {
top: 12
}
},
responsive: true,
legend: {
position: 'right',
}
}
});
How can I make a pie chart fill 100% of the divit is contained in? The div has a width of 198px and it's height is 152px.
Additionally I would like to have a linear-gradient effect inside each pie slice, can you advise on how to do that?
You can achieve the full height of the pie chart by setting the size attribute in the plotOptions of pie and removing margins, spacing and titles from the chart.
Code
chart: {
margin: [0, 0, 0, 0],
spacingTop: 0,
spacingBottom: 0,
spacingLeft: 0,
spacingRight: 0
},
plotOptions: {
pie: {
size:'100%',
dataLabels: {
enabled: false
}
}
}
Example (updated the fiddle to point to version 2.2.4)
Here is an example demonstrating this.
As to the linear gradients, I don't know if they have been implemented yet, but here is an example showing radial gradients.
Radial gradients are also part of Highcharts 3.0 now, here is an example
Update
Looks like as of Highcharts 3.0, this is not possible anymore due to the chart auto-scaling within the plot area, an excerpt from their documentation:
size: The diameter of the pie relative to the plot area. Can be a percentage or pixel value. Pixel values are given as integers. The default behaviour (as of 3.0) is to scale to the plot area and give room for data labels within the plot area. As a consequence, the size of the pie may vary when points are updated and data labels more around. In that case it is best to set a fixed value, for example "75%". Defaults to .
in my opinion this should not be the case since dataLabels are disabled. should probably be logged as a bug
Update (Aug 2014)
As per Torstein's comment, this is indeed still possible. slicedOffset needs to be set to 0 in addition to the margins begin set. (example)
$(function () {
$('#container').highcharts({
title: null,
chart: {
type: 'pie',
margin: 0
},
plotOptions: {
pie: {
slicedOffset: 0,
size: '100%',
dataLabels: {
enabled: false
}
}
},
series: [{
data: [
['Firefox', 44.2],
['IE7', 26.6],
['IE6', 20],
['Chrome', 3.1],
['Other', 5.4]
]
}]
});
});
#container {
outline: 1px solid red;
padding: 0;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script src="https://code.highcharts.com/highcharts.js"></script>
<div id="container" style="height: 400px; width: 500"></div>
my solutions; (for legend position margin-top error..)
chart: {
plotBackgroundColor: null,
plotBorderWidth: null,
plotShadow: false,
type: 'pie',
height:'100%' // added...
},
plotOptions: {
pie: {
size:'100%',
height: '100%',
dataLabels: {
enabled: false
}
}
}
I need to give solid colors to bar charts...
I have followed this link
Bar chart Example
But i want to give solid colors and also i need to change colors myself... how to do it...
First off, read the API.txt, it answers all your questions. Two things you need to do then. When you specify that you want bars, set fill: 1, which tells flot to make the colors 100% opaque. To specify a colour per series, just add a color:'red' to each data object.
So you end up with a data object like this:
var data = [
{label: 'foo', color:'red', data: [[1,300], [2,300], [3,300], [4,300], [5,300]]},
{label: 'bar', color:'blue', data: [[1,800], [2,600], [3,400], [4,200], [5,0]]},
{label: 'baz', color:'yellow', data: [[1,100], [2,200], [3,300], [4,400], [5,500]]},
];
And flot options like this:
{
series: {
stack: 1,
bars: {
show: true,
barWidth: 0.6,
fill:1
}
}
}
See it in action here: http://jsfiddle.net/ryleyb/kKdxt/