What I'm working with
I have data that I want to chart showing the intensity of rainfall over a period of time. The API documentation that I'm getting this data from says the following:
A very rough guide is that a value of 0 in./hr. corresponds to no precipitation, 0.002 in./hr. corresponds to very light precipitation, 0.017 in./hr. corresponds to light precipitation, 0.1 in./hr. corresponds to moderate precipitation, and 0.4 in./hr. corresponds to heavy precipitation.
Therefore, it seems logical to use a log scale for most of the data (otherwise everything less than moderate rain would be imperceptible), but this obviously causes a problem for when there is no rain predicted.
Possible Solution
The answer to this question suggested adding a small amount to the data and modifying the tooltip to match the original data.
Problem
This would work very nicely, but I don't know how to modify just the data that the tooltip of a Google Chart (the charting tool I'm using) references.
The Google Chart help documents here and here describe several possible roles columns from the chart's data table can play, and one of them is to be the HTML that is rendered in the tooltip. However, I was really hoping to not have to rewrite the HTML for that. Is there anyone here that knows an easy way to just modify the data shown in the tooltip?
The second link you provide gives you the easiest way to modify your tooltip content, Link. Just add another column like dataTable.addColumn({type: 'string', role: 'tooltip'});and then provide your own tooltip, like looping through all your rows and checking for zero values and replacing the tooltips where needed.
Related
Because of the high rendering performance I am using uPlot to visualize historical sensor data.
Is there a way to add horizontal reference lines like recommended min/max values for a data series?
With other libraries that's often straight forward, like the ReferenceLine tag in recharts, but I haven't found anything yet with uPlot. Any hints?
Example: The orange dotted lines are the lower and upper acceptable bounds at 7.0 and 7.4. This image is rendered with recharts, but I want to migrate to uplot.
(There's a layer in front of the chart with the actual, min and max value which is totally independent of the chart.)
I found an acceptable aproach based on two examples in the uPlot repository:
https://leeoniya.github.io/uPlot/demos/trendlines.html
https://leeoniya.github.io/uPlot/demos/draw-hooks.html
The main idea is to handle one of the draw-hooks (draw, drawAxes, drawClear) and to directly drawing on the canvas.
I have some date each has plus or minus value (for example assets or
liabilities)
So at first I integrated nested piechart by amchart
However it has some weak points, you can't get the defference of assets and liabilities at a glance
So next idea is to use like this,discussed here
However I cant find the good sample for amchart4.
Is there any good sample or close sample???
you can do something like this with d3pie chart(see attached image). This is the site: http://d3pie.org/website/examples/donut.html
Just set the stroke to 1 and the fill to white for example. The rest of the stuff I guess is some Math, and you should manipulate the DOM to change those.
The pie chart you want to do, beside looking cool, doesn't apply to this scenario/calculation, especially the percentages are misleading (total being the sum of absolute values of all numbers).
Pie chart is suitable for visualization of all items from the same category. For example, your spending for the month:
which includes Utilities, Transportation, Groceries, etc.
Would a ColumnSeries make more sense in this case?
demo: http://jsfiddle.net/davidliang2008/tna84zer/
I am displaying some visualizations using Google Charts.
There is great variance in the data so some large numbers co-exist with small ones. In the case of a Column Chart this results in a scaling whereby some of the small values probably compute to less than one pixel of height and are thus invisible.
As a result there is no area to hover above, so I cannot show a tooltip.
Is anyone aware of a way to show a tooltip in this situation?
How about the white space above columns? Is there a way to include that as part of the hover region? I cannot find info about this in the Google Charts documentation so it is unlikely, but maybe someone is aware of a way...
By using the option focusTarget: 'category', you can achieve this. It's mainly used for displaying multiple values from the same "grouping" at the hAxis, but it fulfills your needs for this as well.
Example
I have phasor information (polar vector data pairs, each with magnitude and angle, representing voltage and current measurements) that I would like to display using Javascript. They should look something like the image linked below (my rep isn't high enough to directly post it) which I stole from Jesse's question about MatPlotLib. I would also like to easily change which phasors are displayed by a simple mechanic like clicking on the legend entry.
See a phasor diagram example here.
While I have inspected several code sets, I have yet to find a chart package that is built to handle polar vectors like this. Is my Google-fu lacking or do I need to create everything from scratch?
I feel like this is a cheap workaround, but here's what I ended up doing:
I used the polar chart from jqWidgets and with the series type set to "column" and the flip property switched to "true." I put the data in an array with 0 entries for each possible angle except for where I wanted the phasor displayed. Each phasor gets a dedicated series so the legend lists them all. It's not perfect and the array is much larger than it really should need to be, but it's passable.
While it's not surprising that no power system display package is publicly available for Javascript, I'm sure one has to be out there for educational sites if nothing else.
Anyone know if there is a way to hide the view finder, while still having the chart display a subset of the data? If I filter the data before sending it to the chart, the chart lines are skewed instead of contiguous.
I'm trying to filter on a date range subset of the data, while keeping the lines contiguous with the entire set of data.
I noticed in the source, on line 362, they filter on !d.disabled. I'm wondering if I can hook into that somehow. Does anyone know the proper usage pattern for this?
The view finder is actually Square's Crossfilter found here [0] if you wanted to browse the source and view more documentation.
However, I would just set the display attribute to none in CSS of the svg containing the crossfilter and be done with it.
[0] http://square.github.io/crossfilter/