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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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2
readme.md
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@ -5856,11 +5856,13 @@ Global constants, functions and modules. This file is used directly or indirectl
| ```foot(x)``` | Foot to mm conversion |
| ```in(list, x)``` | Returns true if ```x``` is an element in the ```list``` |
| ```inch(x)``` | Inch to mm conversion (For fractional inches, 'inch(1 + 7/8)' will work as expected.) |
| ```limit(x, min, max)``` | Force x in range min <= x <= max |
| ```m(x)``` | m to mm conversion |
| ```mm(x)``` | Explicit mm specified |
| ```no_point(str)``` | Replace decimal point in string with 'p' |
| ```r2sides(r)``` | Replicates the OpenSCAD logic to calculate the number of sides from the radius |
| ```r2sides4n(r)``` | Round up the number of sides to a multiple of 4 to ensure points land on all axes |
| ```slice(list, start = 0, end = undef)``` | Slice a list or string with Python type semantics |
| ```sqr(x)``` | Returns the square of ```x``` |
| ```yard(x)``` | Yard to mm conversion |

17
tests/global.scad
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@ -29,6 +29,23 @@ module globals() {
translate([50, 0])
right_triangle(10, 20, 0);
}
assert(slice("ABCD") == "ABCD");
assert(slice("ABCD", 1) == "BCD");
assert(slice("ABCD", 2) == "CD");
assert(slice("ABCD", 3) == "D");
assert(slice("ABCD", 4) == "");
assert(slice("ABCD", 1, -1) == "BC");
assert(slice("ABCD", 2, -1) == "C");
assert(slice("ABCD", 3, -1) == "");
assert(slice("ABCD", 4, -1) == "");
assert(slice("ABCD", 0, -1) == "ABC");
assert(slice("ABCD", 0, -2) == "AB");
assert(slice("ABCD", 0, -3) == "A");
assert(slice("ABCD", 0, -4) == "");
assert(slice("ABCD", 0, 0) == "");
assert(slice("ABCD", 0, 1) == "A");
assert(slice("ABCD", 0, 2) == "AB");
assert(slice("ABCD", 0, 3) == "ABC");
}
rotate([70, 0, 315]) globals();

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