Is there a way to redefine coordinates via `transform` without causing distortion?

[davibarreira]

Suppose I have a drawing 200 by 200. I then want to draw circles inside this drawing, but I want to use a new coordinate system... Here is an example:

drawheight = 400
drawwidth = 400
d = Drawing(drawheight,drawwidth,:svg)
background("antiquewhite")
sethue("lightgrey")

translate(200,200)
Luxor.transform([2 1 1 -1 0 0]) 
rulers()
circle(Point(10,10),10,:fill)

finish()
d

The problem with this is that it distorts things... I mean, the behavior I'm looking for would be achieved by using rescale within the placement point of the circle. But I don't what to have to write rescale for every case.

[cormullion]

I'm not sure what you want - but isn't the distortion because you've got 2 and -1 on the diagonal, rather than 2 and -2?

julia> cairotojuliamatrix([2 1 1 -1 0 0])
3×3 Matrix{Float64}:
 2.0   1.0  0.0
 1.0  -1.0  0.0
 0.0   0.0  1.0

but I don't know too much about matrices...

[stale[bot]]

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[davibarreira]

Yeah. Don't worry. It's actually defining a way to rescale objects by the positions, similar to D3. But this is not a simple issue.