I want to create the real-time multiline chart using chart-js but do not get any solution on that, please if anyone know about this help me
I'm not that experienced in QT and I need to display 17 line series in the same chart. I tried their example and it's working just for one, maybe two line series. Any ideas on how to show all of them in the same chart?
Since it is better to "give a fishing rod not a fish" as an answer I will explain how link has been found (OP should polish his skills in internet search).
First google: qt chart example
Now to filter this which have multiple sires it is better to switch google search to "Graphics" view
Seen a images page with multiple series can be selected
This gives link to https://doc.qt.io/qt-5/qtcharts-overview.html
And after reading this document there is a link with description of implementation details: https://doc.qt.io/qt-5/qtcharts-overview.html
I am using PHPExcel (http://phpexcel.codeplex.com/) to generate Excel spreadsheet using PHP. Generally, this application can address what I need when working with PHP and spreadsheet, however when I try to draw line in the spreadsheet, I cannot find how to do it.
Normally I can do it in Excel application by doing Insert > Shapes and choose the line. But how to do it programatically using PHPExcel?
I need to do it since I have to plot point and connect them to make a straight line from one cell to another cell in spreadsheet (hence I cannot use Chart feature for this purpose).
Many thanks in advance for the answer.
I have created a graph based on a datset using VS2010 framework 4.0. I get a report that displays the plotted points but not the connector lines. Is there a reference that needs to be set? I downloaded a msChart sample that imports web.ui.datavisualization.chart but that is not available in my imports that I can see.
Any assistance is appreciated.
Thanks to Dominique I was pointed in the direction of the "Drop series field here" grouping on the chart. Once that was removed I was able to see the graphing lines, rather than have the chart think it had (3) distinct groups it was 1 group over several years.
Thanks for your help.
I have a small Win32 console application which is essentially a test harness. I read data in, do some processing on it and currently just output some of the numbers to the console. This isn't a huge problem - I can get an idea of what the data looks like, but it would be much easier to analyse if there was a way of getting that information into a graph for each run of the software.
I've been getting to grips with GNUPlot recently, but can't work out a simple way to get the data sent to it. Has anyone tried this? ..or is there another graphing application I should try?
Excel and OO Calc are great tools and I've loaded .csv data into them for graphing data plenty of times myself. I was, however, hoping for a way to dynamically pipe data into a graphing application to avoid having to close/reopen excel and plot a graph each time I want to look at some data.
I think you can pipe data into GNUPlot (which is why I mentioned it) but the details of how to do so are rather scant.
A simple approach is to wtite the data out as CSV and then import it into a spreadsheet like Excel or OpenOffice to do the graph drawing.
Edit: Following your question, I got interested in GNUPlot myself - this is the simplest description of using it from the command line that I found: http://www.goldb.org/goldblog/CommentView,guid,f378e279-eaa5-4d85-b7d2-0339a7c72864.aspx
Never underestimate the power of Excel and a .csv data dump.
Writing data to a .csv file form C++ is not very difficult and there's lots of articles out there regarding the subject, for example: here, or just google.
Excel can easily load .csv's and then you can just use that to plot whatever graphs you require. THis is particularly useful if you just want a quick visual sanity check of results etc.
You don't really need to touch VBA to do this
In Excel you can set up a Data Connection to a file, it supports many files type but CSV does work fine.
Go to List item
Data Tab
Click Connections
Click Add
select the file
go to the connection properties - un-tick prompt for file name
set the required period.
close the connections dialog
select the start cell for importing the data - cell 1a on worksheet 2
click existing connections
select you data connection
flip to worksheet1 add your chart and hookup the data.
the chart will now update automatically
this is Excel 2007 - but think older version had this and I think OO can do it to.
You might also want to look into XMGrace which allows you to launch it and drive it dircetly from C/Fortran programs as shown here
Excel is completely script-able. Use the macro recorder to figure out the steps. Create the chart in its own sheet. Then save the chart using the GIF filter.
The actual import is something like:
ActiveChart.Export FileName:=something_dot_gif, FilterName:="GIF"
I just found an example of piping data into gnuplot on Cardiff University's website. Not tried it yet, but it looks promising!
[edit] ..and another which includes some notes for windows.
You can use MathGL - it can create a window (FLTK, GLUT or Qt) and display plot inside. Also it have large set of plot types and can work in console.