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2014 reduced performance with back image

Posted: Wed Apr 16, 2014 9:01 pm
by 10046032
Hello,

I am using the latest 2014 32 bit VCL with Delphi XE (Windows 7 64 bit) and I noticed that with GDI+ when a back image is defined, the chart slowly redraws (e.g. pan and zoom are slow). If I use the GDI canvas then performance is ok. Does anyone noticed this behavior? Is there a work around? I did try setting back image draw quality to low but this does not help.

Kindest regards

Re: 2014 reduced performance with back image

Posted: Thu Apr 17, 2014 9:25 am
by 16567921
Ok, here is what I found by mistake :) After adding a filter to the back image performance looks normal. Attached is a sample project (also notice that the unfiltered image is not displayed correctly)

Re: 2014 reduced performance with back image

Posted: Thu Apr 17, 2014 12:23 pm
by narcis
Hello,

Thanks for the example project.

I could reproduce both problems here using the latest binary version but they are solves with our current sources:
JohnnixBackImage.jpg
JohnnixBackImage.jpg (80.09 KiB) Viewed 1472 times
I can send you a test version so that you can test if it solves the problem at your end.

Re: 2014 reduced performance with back image

Posted: Thu Apr 17, 2014 1:35 pm
by 16567921
Hello Narcis,

I can confirm that the test version solves the issue!!! Thank you very much for your prompt reply and support :)

Kindest regards

Re: 2014 reduced performance with back image

Posted: Thu Apr 17, 2014 1:37 pm
by narcis
Hi johnnix,

You're very welcome! I'm glad to hear that.