"Odalrick" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] >I need to draw visible lines on pictures with wxPython. That means I > can't simply use, for instance, a black line since it wont be visible > on a black or dark picture. > > Painting applications like the GIMP accomplish this by altering the > colour of the line based on the colour of the pixel it covers, but the > only way I can think of doing that is getting each pixel, transforming > the colour then painting it on the screen, which seems like a horribly > inefficient way do it. > > I could use alternating colour on the lines, but I don't think that > will be good enough for my taste. > > I think I will use a partially transparent bitmap with a hole in the > appropriate place and move the hole as needed. > > I realized the last solution as I was writing this and I think it will > work fairly well, but I'm still wondering if there is another, better > solution i might have missed. > > /Odalrick > You could try outlining in a light color. For example, draw a 3-pixel-wide white or light gray line, and then overlay your 1-pixel-wide black line. Over light backgrounds, the outline will disappear; over dark backgrounds, the outline will look like a hole in the background to show your black line.
-- Paul -- http://mail.python.org/mailman/listinfo/python-list
