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46 lines
1.2 KiB
Markdown
46 lines
1.2 KiB
Markdown
# ptf_ring
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Transforms a point inside a rectangle to a point of a ring. It can create things such as [tiled_line_mobius](https://github.com/JustinSDK/dotSCAD/blob/master/examples/tiled_line_mobius.scad).
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**Since:** 2.3
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## Parameters
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- `size` : 2 value array `[x, y]`, rectangle with dimensions `x` and `y`.
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- `point` : The point to be transformed.
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- `radius` : The radius of the ring.
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- `angle` : The central angle of the arc.
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- `twist` : The number of degrees of through which the rectangle is twisted.
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## Examples
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use <hull_polyline3d.scad>;
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use <ptf/ptf_ring.scad>;
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size = [20, 10];
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radius = 5;
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rows = [
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for(y = [0:size[1]])
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[for(x = [0:size[0]]) [x, y]]
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];
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columns = [
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for(x = [0:size[0]])
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[for(y = [0:size[1]]) [x, y]]
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];
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for(line = rows) {
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transformed = [for(p = line) ptf_ring(size, p, radius, 360, 180)];
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hull_polyline3d(transformed, thickness = .5);
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}
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for(line = columns) {
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transformed = [for(p = line) ptf_ring(size, p, radius, 360, 180)];
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hull_polyline3d(transformed, thickness = .5);
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}
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