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Forum Topic - Qt speedometer example:

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Dennis Kellly(deleted)

01/23/2012 8:47 PM

post91092

The attached .zip file includes source code and assets for a speedometer simulation using Qt declarative.  It 
illustrates how to script custom gauges which can be driven by native QNX C++ code. 

Includes a Makefile and instructions for building the example via command-line on Windows-hosted Momentics.

PDF documentation and screenshot in next post.

Attachment:

speedo.zip 370.68 KB

Dennis Kellly(deleted)

01/23/2012 8:48 PM

post91093

Re: Qt speedometer example

Documentation...

Attachment:

QtSpeedo.pdf 512.2 KB

Dennis Kellly(deleted)

01/24/2012 9:50 AM

post91102

Re: Qt speedometer example performance issue

NOTE regarding performance -

I did all my testing for this example on i.mx53QSB (armv7).  The SD card filesystem I was using had Qt 4.8.0 binaries 
installed.  The motion is smooth and there is a minimum of a few percent idle time reported.

When I reverted back to the 4.7.1 binaries, I discovered the example behaves very poorly!  With 4.7.1, the CPU 
requirement exceeds 100% so the motion is very jumpy!  Apparently, lots of improvements for the relatively "new" 
declarative model have gone into the baseline.

I have prepared a zipfile with the 4.8.0 runtime binaries and files to support speedo (and the other Qt examples I have 
posted).  Just apply the archive to the root of your runtime filesystem.  If the example utilizes .jpg images, you will 
need to "export QT_PLUGIN_PATH=/usr/lib/qt4/plugins" prior to starting the Qt binary.

The zipfile is: http://dl.dropbox.com/u/13676760/armv7-runtime-4.8.0.zip

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