I am trying to make a demonstration using cubism. I have created a custom context.metric, similar to the random() function on the cubism homepage. This loads my data set and renders correctly, showing a new row each second.
What I want to do now is have the axis scale domain update as well, using the date column from my dataset. For the purposes of demonstration, I want each second that passes in wall-time to correspond to one row in my dataset, which is hourly. I can set the scale domain when I create the context, but I cannot get it to update when new data is fetched.
I have tried to listen for context events such as change, and beforechange and manually update the domain there. It does not seem to work, or I am doing something wrong. Any suggestions would be greatly appreciated.
Thanks for the awesome libraries!
The context's time domain is fixed by the context step and size. For example, if you have a step of ten seconds and a size of 1,440, then the domain is the last four hours. If you use context.axis to display the axis, it will update automatically whenever the context fires a change event; you don't have to do anything. Cubism is designed for realtime dashboards, so it doesn't support advancing an hour per second.
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I have 2 questions need your help.
I would like to add a button on each plot to be a setting button. I use label with event listener and it works well ( as shown in attached file). However, my client asked me to change from normal text to graphic icon? How should I proceed?
As you can see from the attached image, the third plot is macd series. The value rage is from -3e-8 to 3e-8 (by my observation). I manually set the maximum and minimum, and it get incorrect scale as shown.
How should I set the maximum and minimum for yScale?
I don't know how to get maximum and minimum value from a series. Can you suggest me?
A1 – Unfortunately, the current version of AnyChart doesn't provide an opportunity to add custom-made buttons inside the chart. But you can use a trick and use stage based layout. It means that the container includes a stage. The stage includes the stock chart all other elements by layers. Using this approach you can place an image (icon) upon the plot and set a listener just as for the 'settings' label.
For details, please, check the sample in the comment below.
A2 - We are planning to fix this behavior in 8.4.2 update (approximately by the end of November 2018).
I will notify you when the fix becomes available.
As a temporary workaround, you can get min /max value from your MACD indicator. For details, please, check the sample in the comment below.
You can apply min/max to the yScale of plot #0 like this:
chart.plot(0).yScale().minimum(minValue);
chart.plot(0).yScale().maximum(maxValue);
We are glad to inform you that we have released 8.4.2 update which brings many fixes and improvements. This update also includes a fix on the issue you reported. Now calculation of min/max of Y-scale works properly with small values. Update your binaries to get the fix.
Need to display line in a line-chart , with the ability to move the tiles, to see a max bitrate value line, to see labels and axis pointers on hover, grouped with a table and time Slider.Y dimension needs to display "bitrate total" or "bitrate Avg" (as defined in code). X dimension needs to display 15 min interval in scope of weeks.
I can upload my data into a table but not into the line graph. I can see points on the graph using .renderDataPoints() but no lines.
I checked the data - could not find any null/NaN values being returned, not using any old version of colors.
The code can be found in https://jsfiddle.net/dani2011/bu2ag0f7/8/. Tried to replace my CSV with var data but nothing is being displayed at the moment in the fiddle. The code as whole is displayed in https://groups.google.com/forum/#!topic/dc-js-user-group/MEslyF2RWRI
Any help would be greatly appreciated.
Here's my go-to-answer for how to put data into a jsFiddle. Basically it's easiest to stick it in an unused tag in the HTML. bl.ocks.org / blockbuilder.org is easier for this.
Here's a fork of your fiddle with the data loaded that way:
http://jsfiddle.net/gordonwoodhull/bu2ag0f7/17/
I also had to remove the spaces from the column names, because those got d3.csv confused and caused the BITRATE calculations to fail.
There was also some stray code inside the renderlet which was failing with a complaint about dim not existing.
The main reason why data was not displaying was because the input groups were not producing usable aggregated data. Your data is very close together in time, so aggregating by week would aggregate everything.
The way to debug this is to put a breakpoint or a console.log before the chart initialization and look at the results of group.all()
In this case bitrateWeekMinIntervalGroupMove and minIntervalWeekBitrateGroup were returning an array with one key/value pair. No lines can be drawn with one point. :)
It looks like you originally wanted to aggregate by 15 minute intervals, so let's get that working.
For whatever reason, there are two levels of aggregation in crossfilter, the dimension level and the group level. The dimension will have first crack at generating a key, and then the group will further refine these keys.
Your min15 function will map each time-key to the 15-minute mark before it, but it needs data that is higher than 15 minutes in resolution. So let's put these groups on the dateDimension, which hasn't already been mapped to a lower resolution:
var minIntervalWeekBitrateGroup = dateDimension.group(min15).reduceSum(function (d) {
return +d.BITRATE
});
var bitrateWeekMinIntervalGroupMove = dateDimension.group(min15).reduce(
...
Great, now there are 30 data points. And it draws lines.
I made the dots a bit smaller :) because at 30 pixels it was hard to see the lines.
Zooming in using the range chart reveals more of lines:
There still seem to be glitches in the reduce function (or somewhere) because the lines drop to zero when you zoom in too far, but hopefully this is enough to get you moving again.
My fork of your fiddle: http://jsfiddle.net/gordonwoodhull/bu2ag0f7/25/
I am trying to show machine states over time. Part of this is to reproduce/automate a report that used to be done by hand. It consists of coloring 2minute 'time slices' in Excel based on what the machine is doing.
(Sorry, not enough reputation to post a picture, but it is a classic heatmap where the state drives the color. Some non DC-JS fiddle: http://jsfiddle.net/ww6Lbnc5/4/)
I was able to generate most of what I want in the following jsfiddle:
http://jsfiddle.net/hwhfxz2t/14/
See fiddle for code.
The total state duration (for selected time frame) is shown in the pieChart, followed by the individual state lines and then the heatmap that people are used to. (the ZOOM and date selection buttons do not work in the fiddle but are there to select specific data ranges or zoom in if you like).
The line charts uses the original representation of the states, which consists of a time the state is entered and a duration.
In order to make the heat map work, I had to (I think) take the original data and convert it into individual minute chunks and mark them with a state. So for instance the original data specifying:
RUN state starting 14:30 for 300 seconds
becomes:
14:30=RUN, 14:31=RUN, 14:32=RUN, 14:33=RUN and 14:34=RUN
The code in lines 233-297 loops through the original data and generates a new one that does this. In cases where there is more than one state within a given minute, the last state survives.
This works okay but it seems that this code is exactly what is normally done in group().reduce(add,remove,init). But in this case I need to add multiple timeslots depending on the duration of a state.
Also, because it is now using a different crossfilter, maps do not update each other.
Here are my questions related to this:
Can I display a heatmap without supplying information for all individual
'cells'? (i.e. straddle cells based on a value, similar to rowspan in a table)
Can I add multiple values at once inside group().reduce()?
Is there an easy way to invert the yAxis so 0 is at the top?
When clicking a row in the heatmap, it selects a column and vice-versa?
I'm not sure if this should be in the crossfilter group. If so please ignore my rambling. If someone knows how to keep the charts linked by grouping better, please let me know.
--Nico
Concerning Question 3:
DC.js heatmaps currently do not support custom order functions on axis but there is a pull request that has been merged into the developing branch and should be accessible to the public soon.
You could manually edit the dc.js file to set the sorting in heatmaps to a custom function. In the latest (2.0.0-beta10) version it is the following line:
rowValues.sort(d3.ascending);
and accordingly
colValues.sort(d3.ascending);
I have an flex-3 swf(simple line chart- that use http-service to get data for the chart)
and in my application ,in one page i have to list multiple rows of data( normally more than 30 rows), for each row i have to include this chart .
problem is when the numbers of rows are increasing at the loading time the browser went in to unresponsive state.
I want to know how to handle this situation , is there any better way to show the single flex-3 chart multiple times in a page.
Charts are heavy components. I don't recommend using too much instances. Also, you seem to just create more and more instances of time, that is not the best solution. You should reuse instances. Check out how Flex uses item renderer.
creating simple charts with BIRT is easy, but now I would like to bring some more life to them...
imagine a simple line chart. Let's define as a requirement, that the maximum value should be highlighted. A further requirement would be that if the user clicks on this data point, something happens.
How can I solve this?
I can imagine that I could created a second value series which consists only of the highlighted data points.
But it would be nicer if there was a JavaScript API (or even a server side java api) with which I could loop through the data points and add a highlight on the fly. Is this possible?
I think I've found a good starting point:
http://www.birt-exchange.org/org/devshare/designing-birt-reports/276-birt-chart-scripting-dynamic-markers-and-datapoint-colors/
Now I have to find a way to add on click events to certain data points...