Alas, I suspect that you're not being patient enough for topo lines to be rendered. I just tried it as well, and found that it took 336 seconds (!) on my older server computer to render over a view spanning 0.7x0.4 degrees. Apparently, the Graphics2D.drawPolyline() method in the Java runtime library has slowed down immensely, and that is what is used to draw all the squiggly contour lines. And, if you pan or zoom the map, all the incomplete work put into rendering for the previous map is tossed out and started over for the new map coverage.
Just out of curiosity, what version of the Java runtime are you using? And how much RAM does your computer have?
Of course, it doesn't help that the process of rendering vector contour lines from raster elevation data is computationally intensive as well, because that is also a contributor, though I have done everything I can to make that part of the algorithm faster (since that, at least, is in my code in YAAC rather than in Oracle's Java libraries or your operating system's graphics subsystem).
I would recommend that you switch to using topographic contour regions rather than lines; they are much faster to compute. In the meantime, I will look at ways to improve the performance of this code.
Andrew, KA2DDO
author of YAAC
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[email protected]> on behalf of David Lowry via groups.io <huskyrunnr@...>
Sent: Tuesday, December 31, 2024 12:56 PM
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[email protected]Subject: [yaac-users] Can’t get topo lines
I’m running YAAC 1.0-beta205 on Windows 10, but a previous version behaved the same. I can successfully download pre-imported OSM tiles. I can successfully download a small radius of the NASA topo data. I have correct lat/lon entered in the download dialog. When I toggle on view>layers>show topography>show topographic contour lines I get the citation to NASA in the lower right corner of the map but I can’t see any contour lines. I’m wondering what I’m missing. Thanks for any advice.
David
