On Mon, Jul 07, 2008 at 07:37:28PM -0400, we recorded a bogon-computron collision of the <[EMAIL PROTECTED]> flavor, containing: > I'll take a stab at it. > > The code that you are looking at is only called when not in UTM mode. Have a > look at draw_grid()
Well, that would 'splain it. > On Mon, July 7, 2008 6:16 pm, Tom Russo wrote: > > Ok, so I usually run my station with coordinate system UTM, since that's > > what I like to use most often. But sometimes I need to switch to Lat/Lon > > in DMS or DDMM.MM format when working with some groups who need things that > > way. > > > > I just this moment noticed something truly bizarre about how Xastir displays > > the screen extents in its map border (enabled with Map->Enable Map Border > > and > > Enable Map Grid). > > > > With UTM, the extents appear to be displayed correctly, but with lat/lon > > the extents displayed are both (roughly) the coordinates of the lower right > > corner. See for example these two screen shots, which differ only by the > > setting of coordinate system: > > http://www.swcp.com/~russo/imgs/utm.jpg > > http://www.swcp.com/~russo/imgs/ll.jpg > > > > Note that the lat/lon coordinates displayed for upper left corner are the > > same as the lat/lon coordinates for the lower right. That's just plain > > wrong. > > > > What's puzzling, though, is the code for this, in maps.c: > > > > > > // Put metadata in top border. > > // find location of upper left corner of map, convert to Lat/Long > > convert_lon_l2s(xx2, grid_label1, sizeof(grid_label1), > > coordinate_format > > ); > > convert_lat_l2s(yy2, grid_label2, sizeof(grid_label2), > > coordinate_format > > ); > > xastir_snprintf(grid_label, > > sizeof(grid_label), > > "%s %s", > > grid_label1,grid_label2); > > // find location of lower right corner of map, convert to Lat/Long > > convert_lon_l2s(xx2, grid_label1, sizeof(grid_label1), > > coordinate_format > > ); > > convert_lat_l2s(yy2, grid_label2, sizeof(grid_label2), > > coordinate_format > > ); > > > > Note that both sets of "convert_lon_l2s" are working on the same pair of > > coordinates, xx2 and yy2, with nothing intervening to change them. In > > earlier > > code we have: > > > > // Find xastir coordinates of upper left and lower right corners. > > xx = NW_corner_longitude + (border_width * scale_x); > > yy = NW_corner_latitude + (border_width * scale_y); > > xx2 = NW_corner_longitude + ((screen_width - border_width) * scale_x); > > yy2 = NW_corner_latitude + ((screen_height - border_width) * scale_y); > > > > > > It *looks* like the two pairs of convert_lon_l2s should be working on > > xx,yy and xx2,yy2 instead, but that doesn't explain at all how the UTM > > version > > of this code actually produces a banner at the top that is correct. They > > should all be wrong. > > > > Can anyone spot what's going on here? > > > > -- > > Tom Russo KM5VY SAR502 DM64ux http://www.swcp.com/~russo/ > > Tijeras, NM QRPL#1592 K2#398 SOC#236 AHTB#1 > > http://kevan.org/brain.cgi?DDTNM > > "It's so simple to be wise: just think of something stupid to say and > > then don't say it." --- Sam Levinson > > > > _______________________________________________ > > Xastir mailing list > > [email protected] > > http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir > > > > -- Tom Russo KM5VY SAR502 DM64ux http://www.swcp.com/~russo/ Tijeras, NM QRPL#1592 K2#398 SOC#236 AHTB#1 http://kevan.org/brain.cgi?DDTNM "It's so simple to be wise: just think of something stupid to say and then don't say it." --- Sam Levinson _______________________________________________ Xastir mailing list [email protected] http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir
