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more error messages for star()

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improve speed and flexibility of apply()
fix triangulation bug
add support for single point 2d solutions in polygon_line_intersection
This commit is contained in:
Adrian Mariano
2021-09-14 20:10:55 -04:00
parent 2ea90b7467
commit 4f8ebb2e80
4 changed files with 46 additions and 21 deletions
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16
affine.scad
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@@ -142,6 +142,9 @@ function affine3d_to_2d(m) =
// Applies the specified transformation matrix to a point, pointlist, bezier patch or VNF.
// Both inputs can be 2D or 3D, and it is also allowed to supply 3D transformations with 2D
// data as long as the the only action on the z coordinate is a simple scaling.
// .
// If you construct your own matrices you can also use a transform that acts like a projection
// with fewer rows to produce lower dimensional output.
// Arguments:
// transform = The 2D or 3D transformation matrix to apply to the point/points.
// points = The point, pointlist, bezier patch, or VNF to apply the transformation to.
@@ -173,14 +176,15 @@ function apply(transform,points) =
? /* BezPatch */ [for (x=points) apply(transform,x)] :
let(
tdim = len(transform[0])-1,
datadim = len(points[0])
datadim = len(points[0]),
outdim = min(datadim,len(transform)),
matrix = [for(i=[0:1:tdim]) [for(j=[0:1:outdim-1]) transform[j][i]]]
)
tdim == 3 && datadim == 3 ? [for(p=points) point3d(transform*concat(p,[1]))] :
tdim == 2 && datadim == 2 ? [for(p=points) point2d(transform*concat(p,[1]))] :
tdim == 3 && datadim == 2 ?
tdim==datadim && (datadim==3 || datadim==2) ? [for(p=points) concat(p,1)] * matrix
: tdim == 3 && datadim == 2 ?
assert(is_2d_transform(transform), str("Transforms is 3d but points are 2d"))
[for(p=points) point2d(transform*concat(p,[0,1]))] :
assert(false, str("Unsupported combination: transform with dimension ",tdim,", data of dimension ",datadim));
[for(p=points) concat(p,[0,1])]*matrix
: assert(false, str("Unsupported combination: transform with dimension ",tdim,", data of dimension ",datadim));
// Function: rot_decode()