I can't find a way to set a line width for the SDL_RenderDrawLine function, but I can't believe there's no way to set it. That's just... basic. Is there really no way to do so? Are the lines always 1 pixel wide, or what?
EDIT: Found an extension library (SDL_GFX) that provides that feature. It's wierd native SDL doesn't have that, though...
My purpose was to draw buttons' borders. There is no way to specify the SDL_Rect border width, so I was trying the line approach. How can I draw a customisable button border, then?
If you're using a image for the button, the border can be included in the image.
If not, I guess you can draw a bigger (filled) rectangle first, and then the button rectangle after? When the button rectangle overwrites the larger, you'll just be left with what looks like a border. This might be very wasteful, especially if you have many or large buttons.
Another option could be to draw 4 (filled) rectangles around the button's rectangle.
Just some suggestions off the top of my head, maybe they can help you achieve what you want.
