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Added list and string slicing.

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Chris Palmer
2020-11-04 21:44:07 +00:00
parent b5fe03fcb2
commit df43fe7dc6
3 changed files with 29 additions and 0 deletions
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10
utils/core/global.scad
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@@ -36,12 +36,22 @@ function in(list, x) = !!len([for(v = list) if(v == x) true]);
function Len(x) = is_list(x) ? len(x) : 0; //! Returns the length of a list or 0 if ```x``` is not a list
function r2sides(r) = $fn ? $fn : ceil(max(min(360/ $fa, r * 2 * PI / $fs), 5)); //! Replicates the OpenSCAD logic to calculate the number of sides from the radius
function r2sides4n(r) = floor((r2sides(r) + 3) / 4) * 4; //! Round up the number of sides to a multiple of 4 to ensure points land on all axes
function limit(x, min, max) = max(min(x, max), min); //! Force x in range min <= x <= max
module translate_z(z) translate([0, 0, z]) children(); //! Shortcut for Z only translations
module vflip() rotate([180, 0, 0]) children(); //! Invert children by doing a 180&deg; flip around the X axis
module hflip() rotate([0, 180, 0]) children(); //! Invert children by doing a 180&deg; flip around the Y axis
module ellipse(xr, yr) scale([1, yr / xr]) circle4n(xr); //! Draw an ellipse
function slice_str(str, start, end, s ="") = start >= end ? s : slice_str(str, start + 1, end, str(s, str[start])); // Helper for slice()
function slice(list, start = 0, end = undef) = let( //! Slice a list or string with Python type semantics
len = len(list),
start = limit(start < 0 ? len + start : start, 0, len),
end = is_undef(end) ? len : limit(end < 0 ? len + end : end, 0, len)
) is_string(list) ? slice_str(list, start, end) : [for(i = [start : 1 : end - 1]) list[i]];
module extrude_if(h, center = true) //! Extrudes 2D object to 3D when ```h``` is nonzero, otherwise leaves it 2D
if(h)
linear_extrude(h, center = center, convexity = 2) // 3D