The fax is real from NWS/NCEP for Feb 11. We had tremendous storms and 85 knots across large parts
of the Atlantic. Environment
is upset with our abuse and this is not a good thing for sailors! We must be ever vigilant and more careful than ever. Enough of that, but it is why Weatherfax is an important tool.
I have delved into this panning/scale anomaly further. The file TEST-ppam50bw.gif is 1920x1080 according to GIMP.
The correct coordinate entry is as follows:
The incorrect coordinate entry which causes pan/scale issues:
I found that when I used a "Chart Group" titled "None" that has just a few ENC charts
[because we are prevented from having a chart group with 'no charts' which uses just simple 'Gshhs Base' - (I think opencpn should make this an automatic chart group that we can select)]
to speed things up, but I could not Zoom out as far (I think this is an issue with Opencpn
, perhaps) but that is the chart setup where this anomaly occurs. There are two conditions which much be met for it to occur:
1. Chart Group is set to "None" which is a few ENC charts
2. Incorrect Coordinates are entered as above.
What Happens: When panning or scaling the WxFx dances across the globe (at a lesser rate than the pan) until the fax disappears when you have panned too far.
Also there is a lot of High CPU use particularly in MSVC Debug mode. The WxFx plugin never had a "break" and was pretty stable all the way through the entire exercise. I could hit edit, change coords to be correct, or not correct and Finish, run tests, and then hit Edit, etc. Never failed. All this was done with Opencpn OFF.
When I turn on Chart Group CM93 two things happen:
1. The pan/scale antics stop and the WxFx file above stays in the right place.
2. I can zoom out further and faster.
Forgive me, but I have screen
shots too, in sequence. The titles of each png should be explanatory.
Sean I am going to send you TEST-ppam50bw.gif so it does not get processed by the forum upload. Ok?
I don't know if you can protect users from incorrect data entry! Aren't there too many cases to test? I think this error stemmed from switching from lat/long to long/lat and my previous scribbles were from before that.
Perhaps we need a User beware note in the Plugin writeup, similar to what I wrote earlier? In any case, if there are some broad coordinate data validation tests that can be done, that would be nice. (I expect you are already doing that though.)
The final screen
shot shows the transparency issue which seems to persist.
Hope this helps. Sending the file as attachment to your email