Lazarus
Programming => General => Topic started by: Awesome Programmer on March 12, 2019, 09:04:19 pm
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I am testing Mapviewer and its demo and it is very laggy when you move the map. Is that how it suppose to be? Is there something that can be done to eliminate or reduce the lagginess of the map when you move it? I made a video file for you to view what I am seeing. Any input will be greatly appreciated. Thanks.
https://drive.google.com/file/d/12Al-04ns1pshrb2G2G5__LJPWuIyi2mo/view?usp=sharing
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This is not the lazmapviewer of https://sourceforge.net/p/lazarus-ccr/svn/HEAD/tree/components/lazmapviewer/ which is certainly faster (although not perfect either).
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:o
I didn't know that... I thought KcmMapviewer uses TMapViewer. Okay, I will try the TMapViewer... thanks.
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:(
I downloaded the mapviewer you pointed me to and tried to install the package. Compiler is running into an issue... Please have a look at the attached image.
Something about gtkDef.
Thank you.
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Check you have LCLType and LCLIntf in your uses clause.
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Well, that entire TMapViewer thing may appear confusing. It is all based on this thread: https://forum.lazarus.freepascal.org/index.php?topic=12674.15.
- The original work was by Maciej Kaczkowski which led to kcMapViewer (sources now at https://github.com/maciejkaczkowski/mapviewer).
- In reply #44 user ti_dic improved the component by adding massive thread support and faster graphics using the package rgb_graphics; the original sources can be found at https://sourceforge.net/p/roadbook/code/ci/master/tree/mapviewer/.
- And there are the CodeTyphon versions (pl_geogis, pl_mapviewer) which add to the confusion...
- Later, I found this thread and decided to take the best out of both both version and make it available on lazarus ccr as "lazMapviewer": https://sourceforge.net/p/lazarus-ccr/svn/HEAD/tree/components/lazmapviewer/. It removes RGBGraphics again and uses LazIntfImage instead. RGBGraphics, however, can be reactivated by a conditional define. Unfortunately this version is not yet complete. It works on Windows, but has a thread-related memory leak. On Linux I just noticed that there seems to be an issue with LazIntfImage used instead of RGBGraphics leading to severe crashes. I do not see crashes with RGBGraphics.
As for your compilation issue: I cannot confirm this on Linux /gtk2 when I use the RGBGraphics distributed via online package manager.
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As I mentioned here https://forum.lazarus.freepascal.org/index.php/topic,12674.75.html problem is with recreating whole screen when position is changed (while mouse move or screen size) not with screen rendering library or thread usage. Thread usage is overkill too (and memory leaks) :) I can look on this only next month.
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I don't have any problem installing the Kcmmapviewer package. In fact, the demo on the video is the demo using KCM. However, I did notice that KCMmapviewer is also using TMapviewer.