//
// NopSCADlib Copyright Chris Palmer 2018
// nop.head@gmail.com
// hydraraptor.blogspot.com
//
// This file is part of NopSCADlib.
//
// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
// GNU General Public License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with NopSCADlib.
// If not, see <https://www.gnu.org/licenses/>.
//

//
//! Simple tube or ring
//
include <../utils/core/core.scad>

module ring(or, ir) //! Create a ring with specified external and internal radii
        difference() {
            circle4n(or);
            circle4n(ir);
        }

module tube(or, ir, h, center = true) //! Create a tube with specified external and internal radii and height ```h```
    linear_extrude(h, center = center, convexity = 5)
        ring(or, ir);