Alpha question

Questions
1

Is a zero alpha color supposed to be fully transparent? I thought so but then why does thus draw a red line at all?

function draw()
    background(0,0,0,255)
    noSmooth()
    strokeWidth(2)
    stroke(0, 0, 0, 255)
    fill(0,0,255,255)
    rectMode(CORNER)
    rect(100,100,200,200)
    
    stroke(255,0,0,0)
    line(0,150,600,150)
end
2

Or simpler, why does this draw a red line?

function draw()
    background(0,0,0,255)
    noSmooth()
    strokeWidth(2)
    stroke(255,0,0,0)
    line(0,150,600,150)
end
3

I never noticed that before, it’s seems related to using noSmooth()

4

Yeah it’s a problem with the way we draw noSmooth() lines (GL_LINES). Please put this on the issue tracker and we’ll tackle it in the future.

5

Nevermind this turned out to be an easy fix. It will be fixed in the next version after 1.2.7.

6

Thanks!