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dotSCAD/src/bend_extrude.scad
2020-01-28 20:49:08 +08:00

47 lines
1.2 KiB
OpenSCAD

/**
* bend_extrude.scad
*
* @copyright Justin Lin, 2019
* @license https://opensource.org/licenses/lgpl-3.0.html
*
* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-bend_extrude.html
*
**/
module bend_extrude(size, thickness, angle, frags = 24) {
x = size[0];
y = size[1];
frag_width = x / frags ;
frag_angle = angle / frags;
half_frag_width = 0.5 * frag_width;
half_frag_angle = 0.5 * frag_angle;
r = half_frag_width / sin(half_frag_angle);
s = (r - thickness) / r;
module get_frag(i) {
offsetX = i * frag_width;
linear_extrude(thickness, scale = [s, 1])
translate([-offsetX - half_frag_width, 0, 0])
intersection() {
translate([x, 0, 0])
mirror([1, 0, 0])
children();
translate([offsetX, 0, 0])
square([frag_width, y]);
}
}
offsetY = -r * cos(half_frag_angle) ;
rotate(angle - 90)
mirror([0, 1, 0])
mirror([0, 0, 1])
for(i = [0 : frags - 1]) {
rotate(i * frag_angle + half_frag_angle)
translate([0, offsetY, 0])
rotate([-90, 0, 0])
get_frag(i)
children();
}
}