76 lines
4.1 KiB
OpenSCAD
76 lines
4.1 KiB
OpenSCAD
//
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// NopSCADlib Copyright Chris Palmer 2018
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// nop.head@gmail.com
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// hydraraptor.blogspot.com
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//
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// This file is part of NopSCADlib.
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//
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// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
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// GNU General Public License as published by the Free Software Foundation, either version 3 of
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// the License, or (at your option) any later version.
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//
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// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along with NopSCADlib.
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// If not, see <https://www.gnu.org/licenses/>.
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//
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//
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//! Global constants, functions and modules. This file is used directly or indirectly in every scad file.
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//
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include <../../global_defs.scad>
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function inch(x) = x * 25.4; //! Inch to mm conversion (For fractional inches, 'inch(1 + 7/8)' will work as expected.)
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function foot(x) = x * 25.4 * 12; //! Foot to mm conversion
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function yard(x) = x * 25.4 * 12 * 3; //! Yard to mm conversion
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function mm(x) = x; //! Explicit mm specified
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function cm(x) = x * 10.0; //! cm to mm conversion
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function m(x) = x * 1000.0; //! m to mm conversion
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function sqr(x) = x * x; //! Returns the square of ```x```
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function echoit(x) = echo(x) x; //! Echo expression and return it, useful for debugging
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function in(list, x) = !!len([for(v = list) if(v == x) true]); //! Returns true if ```x``` is an element in the ```list```
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function Len(x) = is_list(x) ? len(x) : 0; //! Returns the length of a list or 0 if ```x``` is not a list
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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
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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
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module translate_z(z) translate([0, 0, z]) children(); //! Shortcut for Z only translations
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module vflip() rotate([180, 0, 0]) children(); //! Invert children by doing a 180° flip around the X axis
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module hflip() rotate([0, 180, 0]) children(); //! Invert children by doing a 180° flip around the Y axis
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module ellipse(xr, yr) scale([1, yr / xr]) circle4n(xr); //! Draw an ellipse
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module extrude_if(h, center = true) //! Extrudes 2D object to 3D when ```h``` is nonzero, otherwise leaves it 2D
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if(h)
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linear_extrude(height = h, center = center) // 3D
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children();
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else
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children(); // 2D
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module circle4n(r, d = undef) { //! Circle with multiple of 4 vertices
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R = is_undef(d) ? r : d / 2;
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circle(R, $fn = r2sides4n(R));
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}
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module semi_circle(r, d = undef) //! A semi circle in the positive Y domain
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intersection() {
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R = is_undef(d) ? r : d / 2;
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circle4n(R);
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sq = R + 1;
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translate([-sq, 0])
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square([2 * sq, sq]);
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}
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module right_triangle(width, height, h, center = true) //! A right angled triangle with the 90° corner at the origin. 3D when ```h``` is nonzero, otherwise 2D
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extrude_if(h, center = center)
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polygon(points = [[0,0], [width, 0], [0, height]]);
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include <sphere.scad>
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include <bom.scad>
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include <polyholes.scad>
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include <teardrops.scad>
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include <rounded_rectangle.scad>
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include <clip.scad>
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