We Keep Coding

How to set and adjust plots with equal axis aspect ratios - CHART.js

I have a project where I show the movements of the robot, I want to make this map so that the x and y scales are proportional to each other.
These data are real-time data, which, as I mentioned, shows the movement of a robot.
Can anyone help me with this?
This is the figure:
myChart = new Chart(ctx, {
type: 'scatter',
data: {
datasets: [{
label: '',
backgroundColor: "blue",
fill: false,
data: [],
}]
},
options: {
scales: {
xAxes: [{
ticks:{
suggestedMax:15,
}
}]
yAxes: [{
ticks:{
suggestedMax:15,
}
}]
}
}
});

You can define the desired dimension of your canvas through the width or height property.
<canvas id="chartContainer" width="400"></canvas>
...or using CSS.
canvas {
width: 400px;
}
Further you should also define responsive: false and aspectRatio: 1 within the chart options, latter represents a square canvas.
options: {
responsive: false,
aspectRatio: 1,
See Configuration Options at the Chart.js documentation

How to use major tick marks in chart.js 2.9.3?

I use latest Chart.js 2.9.3. I've tried the following code with major ticks:
var ctx = document.getElementById('chart').getContext('2d');
var chart = new Chart(ctx, {
type: 'horizontalBar',
data: {
datasets: [{
barPercentage: 0.2,
borderColor: 'black',
borderWidth: 2,
borderSkipped: false,
backgroundColor: 'transparent',
data: [[0, 8000]]
}]
},
options: {
legend: false,
tooltips: false,
animation: false,
title: {
display: true,
fontSize: '26',
text: 'AT1G24460'
},
scales: {
xAxes: [{
position: 'top',
offset: true,
ticks: {
major: {
enabled: true,
fontColor: 'red'
}
},
gridLines: {
drawOnChartArea: false
}
}],
yAxes: [{
display: false
}]
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.bundle.min.js"></script>
<div class="text-center">
<canvas id="chart"></canvas>
</div>
The result is the following (major ticks are not displayed at all). So how to make major tick marks work in chart.js?
P.S. My final goal is to have top axis like this:
What axis styling is possible without direct canvas painting (ticks below axis baseline, first and last ticks are enlarged, two labels for first and last ticks, no labels except fof first and last tick, etc.)
Thank you in advance.

Official answer:
Major ticks are only supported on the time scale in 2.9. In 3.0 they
are also being added to the log scale. They're not in the linear scale
yet. But major ticks are most useful for deciding which ticks not to
skip in the autoSkipper. 3.0 will also add better support for tick
styling via scriptable tick options (#7337), which will allow you to
make ticks that you want bolder, bigger, different colors, etc. and
you don't need major tick support for that. I'd recommend trying 3.0

Chart not fill ant-row width, even with zero margin and padding

As you can see from the picture below, the chart cannot use 100% of the antd row's width. I tried setting the width to 100% and window.innerWidth but none of those worked.
The chart is drawn using react-chartjs-2 which is a thin wrapper of chart.js, and I have not found any useful information from their documentations yet.
I also found this Chart.js responsive option - Chart not filling container, but my packages are the latest versions when checked (react-chartjs-2#2.7.6 and chart.js#2.8.0).
I have been banging my head over this for a while now, and I am not sure where to look for clues next. If you know something about this please inform me, thank you very much!
Here is the options I used for the bar chart:
var options = {
scales: {
yAxes: [{
ticks: {
beginAtZero: true,
min: 0,
maxTicksLimit: 5
},
gridLines: {
display: true
}
}],
xAxes: [{
barPercentage: 0.7,
gridLines: {
display: false
},
offset: true,
type: "time",
time: {
unit: "day",
stepSize: 1
}
}]
},
maintainAspectRatio: true
};
Its render method (I am using React):
render() {
return (
<Bar
data={this.state.chartData}
width={this.state.appWindow.width}
height={this.state.appWindow.width*0.5}
options={this.changeDateOptions(options)}
legend={legend}
/>
)
//}
}
The style used for ant-row:
const rowStyle = {
width: '100%',
display: 'flex',
flexFlow: 'row wrap',
};
And the picture showing how the chart does not fill 100% of the width:

How to make one line smooth and the other NOT on a chart?

So I'm looking for a way to make one of the lines on my chart NOT smooth and the other smooth. There is a master option to make every line on the chart smooth but not a particular line that I know of.
Here is my chart of what it looks like
PS. Im using JQ Plots http://www.jqplot.com/index.php
Here is my JS code.
//STOCK HIGH VS LOW
var line1 = [['2017-11-27',175.0800],['2017-11-28',174.8700],['2017-11-29',172.9200],['2017-11-30',172.1400],['2017-12-01',171.6700],['2017-12-04',172.6200],['2017-12-05',171.5200],['2017-12-06',170.2047],['2017-12-07',170.4400],['2017-12-08',171.0000],['2017-12-11',172.8900],['2017-12-12',172.3900],['2017-12-13',173.5400],['2017-12-14',173.1300],['2017-12-15',174.1700],['2017-12-18',177.2000],['2017-12-19',175.3900],['2017-12-20',175.4200],['2017-12-21',176.0200],['2017-12-22',175.4240],['2017-12-26',171.4700],['2017-12-27',170.7800],['2017-12-28',171.8500],['2017-12-29',170.5900],['2018-01-02',172.3000],['2018-01-03',174.5500],['2018-01-04',173.4700],['2018-01-05',175.3700],['2018-01-08',175.6100],['2018-01-09',175.0600],['2018-01-10',174.3000],['2018-01-11',175.4900],['2018-01-12',177.3600],['2018-01-16',179.3900],['2018-01-17',179.2500],['2018-01-18',180.1000],['2018-01-19',179.5800],['2018-01-22',177.7800],['2018-01-23',179.4400],['2018-01-24',177.3000],['2018-01-25',174.9500],['2018-01-26',172.0000],['2018-01-29',170.1600],['2018-01-30',167.3700],['2018-01-31',168.4417],['2018-02-01',168.6200],['2018-02-02',166.8000],['2018-02-05',163.8800],['2018-02-06',163.7200],['2018-02-07',163.4000],['2018-02-08',161.0000],['2018-02-09',157.8900]];
var line2 = [['2017-11-27',173.3400],['2017-11-28',171.8600],['2017-11-29',167.1600],['2017-11-30',168.4400],['2017-12-01',168.5000],['2017-12-04',169.6300],['2017-12-05',168.4000],['2017-12-06',166.4600],['2017-12-07',168.9100],['2017-12-08',168.8200],['2017-12-11',168.7900],['2017-12-12',171.4610],['2017-12-13',172.0000],['2017-12-14',171.6500],['2017-12-15',172.4600],['2017-12-18',174.8600],['2017-12-19',174.0900],['2017-12-20',173.2500],['2017-12-21',174.1000],['2017-12-22',174.5000],['2017-12-26',169.6790],['2017-12-27',169.7100],['2017-12-28',170.4800],['2017-12-29',169.2200],['2018-01-02',169.2600],['2018-01-03',171.9600],['2018-01-04',172.0800],['2018-01-05',173.0500],['2018-01-08',173.9300],['2018-01-09',173.4100],['2018-01-10',173.0000],['2018-01-11',174.4900],['2018-01-12',175.6500],['2018-01-16',176.1400],['2018-01-17',175.0700],['2018-01-18',178.2500],['2018-01-19',177.4100],['2018-01-22',176.6016],['2018-01-23',176.8200],['2018-01-24',173.2000],['2018-01-25',170.5300],['2018-01-26',170.0600],['2018-01-29',167.0700],['2018-01-30',164.7000],['2018-01-31',166.5000],['2018-02-01',166.7600],['2018-02-02',160.1000],['2018-02-05',156.0000],['2018-02-06',154.0000],['2018-02-07',159.0685],['2018-02-08',155.0300],['2018-02-09',150.2400]];
var plot2 = $.jqplot('chart1', [line1, line2], {
title: 'AAPL High vs Low',
seriesDefaults: {
rendererOptions: {
//////
// Turn on line smoothing. By default, a constrained cubic spline
// interpolation algorithm is used which will not overshoot or
// undershoot any data points.
//////
smooth: true
}
},
legend: { show: true },
axes: {
xaxis: {
renderer: $.jqplot.DateAxisRenderer,
tickOptions: { formatString: '%b %#d, %#I %p' },
min: 'November 20 2017',
tickInterval: '1 month'
}
},
highlighter: {
show: true,
sizeAdjust: 7.5
},
canvasOverlay: {
show: true,
objects: [
{horizontalLine: {
name: 'average',
y: 171.21, //**AVERAGE_FLOAT_VALUE**
lineWidth: 2,
color: '#FF5555',
shadow: false
}}
]
},
series: [{ lineWidth: 4,
markerOptions: { style: 'square' }
}],
series: [
{ label: 'High' },
{ label: 'Low' }
],
});
If it cant be done in JQ Plots, do you guys know of any other charts that can do this.
Pretty much Im looking for a chart to look like this in the end.

Replying kinda late but..
Yes you can do it in jqplot as well.
Instead of using a seriesDefaults option, go directly and add it in each series you want:
series: [
{
// custom line
lineWidth:2,
markerOptions: { style:'diamond' }
},
{
// here is your smooth line
rendererOptions: {
smooth: true,
},
markerOptions: { style:"circle" }
}
]

Disclaimer: I read it on the internet . . . but apparently d3 can do this (https://gist.github.com/thiyagu-p/3925981). Also, if you Google 'd3 moving average and volume' you get some interesting results. YMMV.

I don't know about jqPlot but you could certainly do this with RGraph:
https://www.rgraph.net/demos/svg-line-trading.html
And if you wanted the gray decorative bar at the back you could use another Bar chart to get this effect before drawing the Line charts and give it some dummy data of:
[1,0,1,0,1,0,1,0,1,0,1,0,1,0,1]

Last y-axis tick gridline not showing with chart title displayed

I'm making a stacked bar graph using Chart.js, with (total stacked) values ranging from 0 to 1 (displayed as 0-100%). I'd like to have a tick/gridline displayed every 0.20/20%, from 0 to and including 1/100%.
Right now, my chart will display the last gridline at 1/100% if I don't include a graph title, but will hide the gridline (but still have the tick label) if I display the title.
Any tips to get the gridline to show?
JS fiddle here: https://jsfiddle.net/amyzlc/n99xac76/, and relevant graph code below.
Link to image of graph with title and without top gridline here.
var stackedBar = new Chart(ctx, {
type: 'bar',
data: dataChart,
options: {
title: {
display: true, //top gridline displays if false, not if true
text: 'Month-wise Adherence'
},
legend: {
position: 'bottom'
},
scales: {
xAxes: [{
stacked: true,
gridLines: {display: false}
}],
yAxes: [{
stacked: true,
gridLines: {drawBorder: false, tickMarkLength: 3},
ticks: {
min: 0,
max: 1, //not showing with title
padding: 6,
stepSize: 0.2,
callback: function(value) {
return Math.round(value*100).toString() + "%";
}
}
}]
}
}
});
Thanks!