Overlaying lines makes it look like the result has increased stroke thickness

[awa5114]

Please consider the following code:

#import "@preview/cetz:0.4.2"
#set page(
  width: auto,
  height: auto,
  margin: 10pt
)

#cetz.canvas({
  import cetz.draw: *

  line((0,0), (1,1))
  

  line((1,0), (2,1))
  line((1,0), (2,1))
  line((1,0), (2,1))
  line((1,0), (2,1))
  line((1,0), (2,1))
  line((1,0), (2,1))
})

The result looks like this

It's quite subtle, but if you look carefully it looks like the second line on the rendering has a thicker stroke. This is problematic for plots where rectangles must share sides, etc.

Why does this occur? Is this a known bug? Are there any viable workarounds? Thanks for your consideration.

[johannes-wolf]

This happens because of anti aliasing I guess. The transparent pixels add up so the lines look thicker.

[awa5114]

@johannes-wolf Is there any way to disable or work around it?

[johannes-wolf]

No, no general workaround besides not drawing overlapping strokes exists.