Author Topic: SFML line drawing method produces odd results... (Read 2333 times)

Pixel_Outlaw · « **on:** December 31, 2010, 09:45:42 pm »

I've noticed that drawing angular lines in SFML often produces lines of inconsistent width. Shown below, some of the lines have odd double pixel thick areas which occur during certain angles. These lines are drawn with a 1.0 thickness value.

nulloid · « **Reply #1 on:** December 31, 2010, 10:32:32 pm »

There is no problem with it, as I see. Lines are very thin rectangles in SFML. Turn on antialias or use ImageSmooth.
(If I'm wrong, pls, correct me

Pixel_Outlaw · « **Reply #2 on:** December 31, 2010, 11:45:36 pm »

Ah OK, that explains how lines can have a width component. If they are indeed treated as rotated rectangles that would explain the odd thick sections. I may have to find a workaround for proper 1 pixel lines it seems. I'm going to get around to OpenGL more but getting a handle on SFML seems to be enough right now. Thanks for the clarification.

nulloid · « **Reply #3 on:** January 01, 2011, 11:38:00 pm »

Well, if you want a proper 1-pixel wide line, how'bout implementing a line drawer function with two (integer-based) coordinates, and then overwrite the Image which will be drawed? I believe there are lots of good tutorials about line drawing, because I wanted to write one, and found a lot of them. (I haven't written it, though.)

Groogy · « **Reply #4 on:** January 02, 2011, 02:27:20 pm »

You can implement a drawable class that uses opengl to draw a proper line. Should take maximum 5 min.