Reset xAxis[0] and xAxis[1] width in Highcharts - javascript

I have a quick question for you re Highcharts.
How do I reset xAxis[0] and xAxis[1] width at runtime, and how do I also reset xAxis[1] offset at runtime? Reason I am asking is because I have a chart harbouring two x-axes and these need to be resized to fit differently sized divs. Example here: http://jsfiddle.net/F3pts/7/
More generally speaking I struggle to reset options at runtime. I understand there are "setOptions" that can define general options for the chart, but that these are then 'trumped' by chart options when the chart is drawn. I however don't always get it how these options can be changed once the chart has already been drawn once. Something like:
newOptions({
chart:{},
xAxis:[{},{}],
etc....
});
Hope you don't think this is a poor quality question. I have trawled through heaps of material on this and cannot find the answer to my needs.
Rgds,
G.

Simple use Axis.update(newOptions), docs.
Where you can set new width/height/offset etc.

Related

Is it possible to avoid the shrinking of Chart.js pie charts when accompanied by labels?

To get labels on Chart.js Pie and Doughnut charts, there are plugins to do so, like: chartjs-plugin-labels but after doing so I noticed a big problem for my UI design:
The size of the actual chart shrinks so that the labels fit within the canvas. It makes sense that the labels need to be able to fit within the canvas they're rendered on, and thus the shrinking of the chart. But sometimes I may use labels, and other times not, and I need my pie charts to render the same size regardless.
Is there a solution in the settings of either Chart.js (the label plugin I'm using is compatible with < 3.0, I'm using 2.9) or chartjs-plugin-labels to maintain consistent chart size, regardless of whether labels are applied?
I tried applying an empty label to every chart, but the size of the chart actually shrinks based on the specific size of the labels being rendered, so aside from being a hacky solution, it doesn't consistently solve the uniformity problem.
For example maybe a way to make charts start off taking 50% of the canvas?
Yes, this is fairly simple actually. The chartjs-plugin-labels.js file contains several lines which force the chart to become smaller when the label settings set the position to either "border" or "outside". Download the script to your own server, comment out the lines below, and everything should work as expected. CodePen demo
Comment/remove these lines:
if (this.options.position === 'border') {
offset = (lines.length - 1) * this.options.fontSize / 2;
}
if (label.options.position === 'outside') {
someOutside = true;
var padding = label.options.fontSize * 1.5 + label.options.outsidePadding;
if (padding > maxPadding) {
maxPadding = padding;
}
}
Here is the updated JS file you can use: https://pastebin.com/raw/gSffqqKu
Just download it as chartjs-plugin-labels.js and use it in your project instead of the original plugin file.

dc.js + make the chart dynamic based on the dataset

here is my fiddle
What I am looking for is a way to handle more elements in the data array, which I am demonstrating in this fiddle here. You can see it does appear as well with the new data, that is the graph is not that legible.
How can I make the size of the chart vary depending on the data array?
here you can see setting the height to 600 makes it appear more legibale
spenderRowChart
.width(250).height(600)
But how do I make this dynamic based on the data array(dataset)?
I understand it might not be a black and white answer but I would appreciate some pointers. I am currently doign some research here and here
You can use array length, example for approximately 30px bars:
spenderRowChart
.width(250).height(30*data1.length)

Y-axis scale uneven

When using Chart.js i cant find a way to evenly scale the Y axis. Overiding and using manual scaling( scaleOverride: true ) for every chart is not really an option since there are alot of them and they have different data. Some one have an idea how to fix the scaling of the data?
This is the scaling i want:
Sometimes the scaling gets uneven depending on the data.
You can set the options globally - this will apply to every chart instance. For instance
Chart.defaults.global.scaleOverride = true;
...

Highcharts Column Graph with background color?

I'm trying to make a column graph in Highcharts and it's not working out too hot. I'm essentially trying to give the column a background color that the data point can overlay. I want the effect of stacking without actually stacking if that makes sense. Any thoughts on what I can do?
Essentially I want it to look like a progress bar... there should be a distinct coloring between the top of the bar and the top of the graph itself. I've already tried stacking: percentage, but to no avail. Thoughts?
There are three options that come to mind:
1) To achieve the 'effect' of stacking, actually stack it: use a dummy series with a color set to the background color that you want, and set with values to fill the gap from the actual data.
Example:
http://jsfiddle.net/jlbriggs/Zf8C7/5/
[[edit for questions
The order of the series does not matter for this to work, and neither does the legendIndex.
What does matter, if you are using multiple series, is the stack property for each series - http://api.highcharts.com/highcharts#series.stack
Each group will need its own stack, and the dummy series and real series within each group need to be assigned to the same stack.
In addition, you need to have one overall max value.
Updated example:
http://jsfiddle.net/jlbriggs/4d9tm6b8/4/
(keep in mind, there are much smoother methods to process and build your data - this is a quick and dirty example whose purpose is to show how to properly use the stack property to do what you need)
]]
2) plotBands, as mentioned above
3) using the alternateGridColor property and set your data to skip an x axis
value between each point.
Reference:
- http://api.highcharts.com/highcharts#xAxis.alternateGridColor

The d3 force layout central node positioning

I have use the d3.js to visualize my data. And the result like this.
PIC_1
PIC_2
My question is how can I make the data present like PIC_1,the center point local in the fixed position,and the other points (children points) around the center point like a circle.
Now,when I refresh the page the data will reload in the brower and all the points' position will randomly change as well.
So which d3's api or tricks can be used to this purpose. :)
Take a look at this example:
link to jsfiddle
If you exampne the code, and play with layout, you'll see that the root node has special treatment that makes it always remain in the center of the graph (unless you drag it, but even that you can prevent if you want).
On initialization, its property fixed is set to true, so that d3 force layout simulation doesn't move it. Also, it is placed in the center of rectangle containing layout:
root.fixed = true;
root.x = width / 2;
root.y = height / 2;
You ofcourse need to change or add some code in order to integrate this feature to your example, but the core idea is really clear from the example I linked.
Hope this helps. Let me know if you have a question, need a clarification, etc.

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