see through colors

[msimard8]

Is there a way in turing where you can draw a coloured box in which you can see through.

Thanks

[Cervantes]

It won't actually be seethrough, but what you can do is average the RGB values of each pixel in the box with the RGB values of whatever is behind it. You may need whatdotcolour for this, if you don't know the RGB values of what is behind the box.
If you don't want a perfect 50% transparency, you'll have to do something different than simply average them. You'd have to weight RGB values accordingly.

[zylum]

i would agree but the thing is, you would have to draw pixel by pixel... which means it will end up *very* slow...

code:

View.Set ("graphics:250;250") proc drawBox (x1, y1, x2, y2, c, a : int)     var alpha1 : real := a / 100     var alpha2 : real := 1 - alpha1     var r1, g1, b1, r2, g2, b2 : real     for x : x1 .. x2         for y : y1 .. y2             RGB.GetColor (c, r1, g1, b1)             RGB.GetColor (whatdotcolor (x, y), r2, g2, b2)             r1 := r1 * alpha1 + r2 * alpha2             g1 := g1 * alpha1 + g2 * alpha2             b1 := b1 * alpha1 + b2 * alpha2             Draw.Dot (x, y, RGB.AddColor (r1, g1, b1))         end for     end for end drawBox for i : 1 .. 7     Draw.FillBox (Rand.Int (1, maxx), Rand.Int (1, maxy), Rand.Int (1, maxx), Rand.Int (1, maxy), Rand.Int (1, maxcolor)) end for drawBox (1, maxy div 2, maxx div 2, maxy, 7, 5) drawBox (1, 1, maxx div 2, maxy div 2, 7, 25) drawBox (maxx div 2, 1, maxx, maxy div 2, 7, 50) drawBox (maxx div 2, maxy div 2, maxx, maxy, 7, 75)

[Drakain Zeil]

kinda helpful:
http://www.fastgraph.com/help/alpha_blending.html