I have a temperature line graph, and I want to draw a red vertical line when the two temperatures (surface temp and dew point) cross. So far what I do is I draw a vertical rectangle on top of my graph at places I calculated it crosses.
It works correctly, but there are a few downsides to this :
The line kind of stands out of the graph ... we can tell I added it later and not in the graph itself;
The pixels are hardcoded, if I change the graph width it might not be good (I could probably fix this, but still)
I would like a little tooltip when I highlight a line, but since it's a simple rectangle, it just sits there and is not dynamic at all.
What would be my best option to integrate this line better un my graphs?
Thanks!
plotLines are your best way to draw the line - http://api.highcharts.com/highcharts#xAxis.plotLines
Two things:
1) The difficult part will be calculating where the lines cross. if they do not cross at a data point, which they most likely won't, there will need to be some guesswork involved, as there is no value you can retrieve from the chart to tell you the axis value where they cross.
2) if you are using separate y axes for these two series, which I assume you must be since they are completely different units and scales, then the point where the lines cross will be COMPLETELY arbitrary and meaningless, as where they cross will be strictly a matter of how the scaling for each axis is set up, and the values have no actual correlation to each other.
Related
I'd like to have a version of a basic area graph where the layering works not by adding one chart and then overlaying a second chart, but instead for every x value, a colored line is drawn from the higher chart's y coordinate to the y coordinate vertically below on the lower chart, and then a different colored line is drawn from this lower chart's y coordinate to the x axis.
Here's images of first the default chart and then my edits as examples.
I anticipate having potentially many charts on one page (anywhere from 1-5,7,10 who knows). And the reason I'm not just putting the "smaller" of the two charts on a higher layer than the "larger" is that they could swap positions over time. See here for two data sets that that swap in which chart has larger values. I'm leaning towards not allowing transparent charts like the default behavior because when many charts of different colors are overlaid their colors mesh together and become difficult to discern.
Is what I've described possible? Are there alternative ways I could accomplish this? Any help would be appreciated.
I'm working on a project where we have some Highcharts graphs populated from database; one of them is an scatter graph and we need to surround the points placed on the outside area of the graph.
We need a graph like this but we need the area surrounding the outside points of the scatter; is there a easy way to do this with Highcharts?
We need it to work on IE11 (client's specs).
We can do it with a new polygon serie to make by getting it from codebehind or from database, but that may take too much development time and will slow down the queries. So we need to know if there is an easier way to do it via Highcharts or Javascript
Thanks in advance.
I am not very familiar with Highcharts, but i could not find such functionality in their API. However there is an easy algorithm to solve your problem.
All you need is to have an array containing the border elements and connect the points from this list like here.
Finding those points is not too hard. Compute the linear equation between two extreme points (like the one on the very top and very right). The resulting formula looks like f(x) = m*x + b
Now you check for all points within that x-range if their y-coordinate is higher than this line (or lower when doing it with the point on the very bottom). If so just add them to your border array and continue with the other extreme points.
Is there a way to create a horizontal bar chart (or modify the row chat)?
The row chart does almost what I want, however I want the y axis to be a continuous variable and it seems the row chart defines the y axis in terms of discrete/ordinal variables.
I was also thinking about rotating the svg with d3. (Rotating the whole div worked, however the brush effect did not rotate too).
I was thinking:
dc.renderAll();
d3.select("body").select("#barChart3").select("svg").attr("transform", function(d) { return "rotate(90)"});
however that erased the whole chart rather than rotating it.
Any suggestions?
Update:
I am having some success with rotating the svg (the brush works), however the graph is being cut off and I can't figure out why...
The two charts are completely different codebases and have different features. The Y axis of a row chart does not even use a scale, so you are quite right that it can't be made continuous in its present form.
It is an eventual goal to merge them, but for now I think rotating is your best bet.
As for the clipping problem you're having, look for the clip-path attribute on the generated SVG. It would need to be rotated as well, but for a quick fix you can probably remove it.
I am building an arc graph where the start and end points of the arcs are times in one day. I have a d3 scale that converts date objects into radians, but I need a scale with four ticks applied around the outside of the graph. I did it with jQuery, and you can see how it's supposed to look below
The problem I'm having is that the jQuery (and myself) is doing a poor job keeping those ticks at equal distances from the graph. Different screen sizes are making this a pain.
Does anyone have any idea how do create d3 time axis that is a circle? I've googled with no results.
Here is a link to the live site
I am trying to use webgl-surface-plot to give a 3D surface plot of data. At several orientations, the axes labels get clipped. At other orientations, part of the graph gets clipped. Is there a way to expand the canvas size and/or move the axes labels closer to the axes?
You can change the default scale/zoom in the code and then just increase the canvas dimensions via the input options. I plan to add the starting zoom as an option to the chart, when I get a chance. I want to fix the axis labels as well. Currently they are at a fixed distance from the axes. They should, instead, be at a distance dictated by the length of the tick labels. Fixing this will be quite tricky, though.