On Thursday, May 4, 2017 at 5:53:36 PM UTC+1, Matthieu Pizenberg wrote:
>
> I definitely recommend looking at https://github.com/opensolid/geometry
> (with it's svg counterpart : https://github.com/opensolid/svg).
> I've been using it a bit and it's awesome for what I understand you want.
>
This is nice and quite fully featured.
It seems a shame that it is not Matrix based though. For example suppose I
want to do a rotation of a shape, ultimately this comes down to mapping
this vector rotation function over all points defining the shape:
rotateBy : Float -> Vector2d -> Vector2d
rotateBy angle =
let
cosine =
cos angle
sine =
sin angle
in
\(Vector2d ( x, y )) ->
Vector2d ( x * cosine - y * sine, y * cosine + x * sine )
Which means calculating sin and cos again for the same input values for
each point.
If it was Matrix based, you'd calculate the rotation matrix once and then
do just the matrix multiplication part for each point. Due to the
properties of linear algebra, you can combine transformation matrices by
multiplying them all together to capture a more complex transformation in a
single operation.
So, nice library with lots of features, missed chance to work with a better
abstraction.
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