It's hard to tell from just one screenshot. - Is the coastline a closed shape? (If it's just a line that ends in nothingness, it won't work). - If so, is the line you want to use as a division on the inside of that shape? (If it's on the outside, it won't work) - Are both on the same layer?
Sometimes it can also help to extend the node beyond the coastline a little more. Don't know why.
--- Making a little box for colonies is just the same as any other territory: draw a nice square somewhere in an unused corner, draw the shape of the island, and put a little line between it and a major port (Courland, of course!)
History of Poland Map Development: 9/5/2017 17:04:47
Hm, so the territory you're trying to make isn't enclosed by a full shape? In that case, you can't split that shape up (because it doesn't exist).
I think the best thing would be: - Select the line you want to use to divide. Press ctrl-D (duplicate). - Connect the two ends of that line through the baltic sea (so on the inside of the coastline shape). - Select both that shape and the baltic sea shape. - Press ctrl-+ That should make the Baltic sea shape and the territory you want merge into one big blob. Since you duplicated the line, it should still be there. You can now just divide the Baltic Sea blob as usual.
I can't post pictures, sadly, but I hope you get the idea.
EDIT: As for the picture - you only want the flag? I assume it's just a bitmap image you pasted. In that case, Inkscape comes with a standard plugin to adjust bitmap images to vector images. It's under "path" -> "trace bitmap". You probably want to go for "Multiple scans: Colors", with about 6 or 7 "scans". Then uncheck "Smooth" and "Stack scans" because those will gobble up memory space.
Once you click OK you are left with both the bitmap image (remove) and a vector copy of it. If it gets your file size over 2 MB, select and click ctrl-L until it doesn't.
Since you'll probably notice that the text won't show up in Warlight either: select the text and go to "path" -> "object to path".
Edited 9/5/2017 17:16:52
History of Poland Map Development: 9/6/2017 00:40:20
You mean you want the background image to show up too?
It won't. It's a bitmap image. Bitmap images don't show up in Warlight (only vector images do). You either need to convert the entire image (just as you did with the flag), or redraw it with inkscape itself.
The last one is probably better. If it's just about those few lakes and coasts, just draw the shapes and fill them in with a nice blue colour. The same goes for the squares: just draw the square shape in inkscape.
As for text, you need to draw that using the text option in Inkscape. Then, select the text and click ctrl-shift-c (or go path->object to path).
History of Poland Map Development: 9/11/2017 02:08:16