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NopSCADlib
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Fixed drag_chains exploding when they shouldn't do.

This commit is contained in:
Chris Palmer 2020-11-27 18:14:04 +00:00
parent 07766d8cf0
commit 773a53829f
1 changed files with 32 additions and 19 deletions
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51
printed/drag_chain.scad
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@ -250,9 +250,8 @@ module drag_chain_link(type, start = false, end = false) { //! One link of the c
}
}
//! 1. Remove the support material from the links with side cutters.
//! 1. Clip the links together with the special ones at the ends.
module drag_chain_assembly(type, pos = 0) { //! Drag chain assembly
// Need to use a wrapper because can't define nested modules in an assembly
module _drag_chain_assembly(type, pos = 0) {
s = drag_chain_size(type);
x = (1 + exploded()) * s.x;
r = drag_chain_radius(type) * x / s.x;
@ -287,22 +286,36 @@ module drag_chain_assembly(type, pos = 0) { //! Drag chain assembly
screws = drag_chain_screw_lists(type);
custom_start = screws[0] == [0, 0, 0, 0];
custom_end = screws[1] == [0, 0, 0, 0];
assert($children == bool2int(custom_start) + bool2int(custom_end), "wrong number of children for end customisation");
assembly(str(drag_chain_name(type), "_drag_chain")) {
for(i = [0 : npoints - 2]) let(v = points[i+1] - points[i])
translate(points[i])
rotate([0, -atan2(v.z, v.x), 0])
link(i);
assert($children == bool2int(custom_start) + bool2int(custom_end), str("wrong number of children for end customisation: ", $children));
translate(points[0] - [x, 0, 0])
link(-1)
if(custom_start)
children(0);
for(i = [0 : npoints - 2]) let(v = points[i+1] - points[i])
translate(points[i])
rotate([0, -atan2(v.z, v.x), 0])
link(i);
translate(points[npoints - 1])
hflip()
link(npoints - 1)
if(custom_end)
children(custom_start ? 1 : 0);
}
translate(points[0] - [x, 0, 0])
link(-1)
if(custom_start)
children(0);
translate(points[npoints - 1])
hflip()
link(npoints - 1)
if(custom_end)
children(custom_start ? 1 : 0);
}
//! 1. Remove the support material from the links with side cutters.
//! 1. Clip the links together with the special ones at the ends.
module drag_chain_assembly(type, pos = 0) //! Drag chain assembly
assembly(str(drag_chain_name(type), "_drag_chain"))
if($children == 2)
_drag_chain_assembly(type, pos) {
children(0);
children(1);
}
else if($children == 1)
_drag_chain_assembly(type, pos)
children(0);
else
_drag_chain_assembly(type, pos);