Why is flipxy=true the default?

[Keno]

In CairoImageSurface, we have a default of flipxy=true. That seems really confusing. Does anybody know the reason?

[JeffBezanson]

Essentially because Cairo uses C order and we use Fortran order.

[Keno]

If I pass in a Julia array indexed by (x,y), it only ends up on the correct axis if flipxy=false.

[JeffBezanson]

That's true, but in that case you're already imagining the array transposed; flipxy=true turns a column of matrix into a column of image.

[Keno]

Fair enough.

[timholy]

That said, I tend to do the same as you: when I'm doing graphics, I index by [x,y]. Consequently I would not be opposed to changing this default.

[JeffBezanson]

Ok with me if you want to change it. After all I think you wrote that originally if I recall, Tim.

[timholy]

I think it was @nolta. I'm a johnny-come-lately when it comes to graphics.

[timholy]

(I may have refactored, though.)