How to make charts/graphs (such as line graphs, bar graphs, circle graphs), etc. in C++, Qt, QML, Blackberry 10 Cascades Beta 3 SDK?

Asked 24/10, 2012 at 20:45 Answered 28/2, 2020 at 19:36

c++qt charts qml blackberry-10

I need to know how to make charts/graphs in Blackberry 10 Cascades Beta 3 SDK, QML, Qt, C++. If anyone can show me an example or point me to something that shows me how to do this, it would be much appreciated.

Pedal answered 24/10, 2012 at 20:45 Comment(3)

Look at this opensource library gitorious.org/qtcharts. If you need a well versed commercial edition here is the link qt.digia.com/Blogs/Qt-blog/Sami-Makkonen/Dates/2012/4/…. – Kepler 25/10, 2012 at 7:4

I just discovered that html5 canvas content will render in my Blackberry Cascades 10 Dev Alpha Simulator which runs in VMWare, if the width is no more than 311 and the height is no more than 211. That's a problem. – Pedal 30/10, 2012 at 16:50

Here are a couple of examples of how to draw vector graphics natively: Using QImage and QPainter or Vector Graphics Drawing with Skia Lib – Saltzman 22/2, 2013 at 0:54

You should check out QChart.js:

http://jwintz.me/blog/2014/02/15/qchart-dot-js-qml-binding-for-chart-dot-js/

https://github.com/jwintz/qchart.js

Screenshot of QChart.js Gallery

Update The Qt Company will release QtCharts in 5.7 under GPL http://blog.qt.io/blog/2016/01/13/new-agreement-with-the-kde-free-qt-foundation/

Ouzel answered 27/1, 2015 at 20:10 Comment(1)

Correction: Qt Charts will not be available under LGPL, but only GPL. It's in the blog post you are referring to. – Aeschines 15/6, 2016 at 9:20

One way to create graphs im Qt and QML is to add a Webview and use html library to display graphs. I have used flot and found it quite flexible.

Bergstein answered 25/10, 2012 at 17:51 Comment(6)

Thankyou, I tried that, and I tried loading graph-types.html from that download into a webview on my Blackberry 10 Dev Alpha Simulator, and it just showed: "Flot Examples" at the top, then a blank section where a graph is supposed to be, and then "Flot supports lines, poins, filled areas, bars and any combinations of these, in the same plot and even on the same data series." below that. It seems it cannot show the graph. – Pedal 25/10, 2012 at 19:49

If you used downloaded version it might be a problem with included js scripts not being seen. You could set their home page as target for webview and check if the graphs are shown. – Bergstein 25/10, 2012 at 21:25

No, even when doing that, everything shows, except for the part in the middle where the chart is. – Pedal 25/10, 2012 at 21:48

Not sure then. It definitely works with Webview on desktop environments so should work on blackberry as well – Bergstein 25/10, 2012 at 23:25

You could also try g.raphael. I found it less flexible but it does not use html canvas so might work. Or some other js graphing library. – Bergstein 26/10, 2012 at 9:46

I will look at it, but I suspect it's the Javascript that it cannot handle, because I tried some simple html5 canvas examples from w3schools that had no Javascript, and they rendered just fine in the Blackberry Simulator. Do I need to install a Javascript interpreter somehow into the simulator? - and will that reflect most actual Blackberries where it will eventually have to work? – Pedal 26/10, 2012 at 15:25

Here is simple QML wrapper for QCustomPlot: https://github.com/ncp1402/ql-lineplot

Naxos answered 3/4, 2015 at 20:58 Comment(0)

This is an old question, but as for me, it was worth to wait.

At this moment there is Qt 5.7.0 Released. Among other new features there are:

Qt Charts. Previously commercial-only Qt Charts module is now included in Qt under also GPLv3 license for open source users.

Qt Data Visualization. Previously commercial-only Qt Data Visualization module is now included in Qt under also GPLv3 license for open source users.

If someone is interested, here is good place to start:

Cosmetic answered 16/6, 2016 at 7:53 Comment(0)

As suggested already, use the WebView object to host your graphs library, you'll find way more libraries to use with it than natively.

From personal experience, I can tell that http://www.highcharts.com/ works very well with Playbook OS and Blackberry 10 OS

Righteousness answered 26/10, 2012 at 20:18 Comment(0)

well i am also looking for solution.

if it is simple plot then maybe you can create ImagePaint with ImagePaintData. very simple example is shown here: https://developer.blackberry.com/cascades/reference/bb_cascades_imagepaint.html

It is also possible to render a chart and seve it as Png for example; Then you could display this as an Image in QML also;

Another option is to use foreign window as described here: https://developer.blackberry.com/cascades/files/webinars/cascades_opengl_webcast.pdf

you could use opengl to render graphics, or try to compile chart library

Well- web browser controll seem like the easiest sollution,and i thinnk that i will try it.

I tried this. Not every Charts library wors on bb10 simulator. For exaple flot , wich was mentioned earlier doesn't work. but some libraries works . for example highCharts and http://elycharts.com/

Edholm answered 26/11, 2012 at 21:47 Comment(0)

If you need something in C++ using QT you might have a look at QWT http://qwt.sourceforge.net/index.html

Kaminski answered 15/2, 2013 at 14:24 Comment(0)

Chart.js 2 is a nice library that offers a ton of different graphs with animations, many options and an easy interface. We have written a QML adapter for it. Qt charts is also nice but it can only be used with GPL or commercial QT license. Our adapter and Chart.js 2 both are MIT-licensed.

Maybe, it's helpful for you and others: https://github.com/Elypson/ChartJs2QML

Semolina answered 28/2, 2020 at 19:36 Comment(0)

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