transparency does not work for text

[doutriaux1]

import vcs
  
x = vcs.init()

fa = vcs.createfillarea()
fa.x = [.4,.6,.6,.4]
fa.y = [.4,.4,.6,.6]
fa.color="red"

x.plot(fa)

txt = vcs.createtext()
txt.string = "TRANSPARENT STRING"
txt.angle = -45
txt.x = .5
txt.y = .5
txt.halign="center"
txt.valign = "half"
txt.color = "blue"
txt.height = 35
x.plot(txt)

x.png("transp_text")

[doutriaux1]

[scottwittenburg]

@doutriaux1 I must be missing something here. Which property on the txt is supposed to set the transparency?

[doutriaux1]

the color

[scottwittenburg]

But then how does setting the color to "blue" do that?

[doutriaux1]

oh sorry probably was a bad copy/paste job 😆
use

txt.color = [0,0,100,50]

[doutriaux1]

BTW

txt.color = [0,0,100,0]

Does make it go away

[scottwittenburg]

Ah, gotcha.

I've played with it now, and it seems that VTK expects a floating point number between 0 and 1. If you try with 0.5, you'll see it's working. So it's just a matter of knowing what the user is expected to input and mapping that into [0.0, 1.0] properly.

Looks like the rest of the color components are expected to be given by the user in the range [0, 100]?

[doutriaux1]

in isofill test double check but i'm pretty sure the opacity is sent from user in the 0-100 range as well

[doutriaux1]

let's ,make it uniform

[scottwittenburg]

I'll put together a PR for it.

[doutriaux1]

thx