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Added center option to spring and documented the origin of rods, etc.

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This commit is contained in:
Chris Palmer 2020-02-27 09:39:05 +00:00
parent ad719dad5a
commit c09a74b4c9
3 changed files with 21 additions and 10 deletions
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6
readme.md
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@ -2474,6 +2474,8 @@ Rocker switch. Also used for neon indicator in the same form factor.
## Rod ## Rod
Steel rods and studding with chamfered ends. Steel rods and studding with chamfered ends.
These items are sysmtrical, so by default the origin is in the centre but it can be changed to the bottom.
[vitamins/rod.scad](vitamins/rod.scad) Implementation. [vitamins/rod.scad](vitamins/rod.scad) Implementation.
@ -2885,6 +2887,8 @@ Filament spool models
## Springs ## Springs
Compression springs. Can be tapered, have open, closed or ground ends. Ground ends will render a lot slower. Compression springs. Can be tapered, have open, closed or ground ends. Ground ends will render a lot slower.
By default springs have their origin at the bottom but can be centered.
[vitamins/springs.scad](vitamins/springs.scad) Object definitions. [vitamins/springs.scad](vitamins/springs.scad) Object definitions.
@ -2913,7 +2917,7 @@ Compression springs. Can be tapered, have open, closed or ground ends. Ground en
### Modules ### Modules
| Module | Description | | Module | Description |
|:--- |:--- | |:--- |:--- |
| ```comp_spring(type, l = 0)``` | Draw specified spring, l can be set to specify the compressed length. | | ```comp_spring(type, l = 0, center = false)``` | Draw specified spring, l can be set to specify the compressed length. |
![springs](tests/png/springs.png) ![springs](tests/png/springs.png)

2
vitamins/rod.scad
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@ -19,6 +19,8 @@
// //
//! Steel rods and studding with chamfered ends. //! Steel rods and studding with chamfered ends.
//!
//! These items are sysmtrical, so by default the origin is in the centre but it can be changed to the bottom.
// //
include <../core.scad> include <../core.scad>
use <../utils/thread.scad> use <../utils/thread.scad>

23
vitamins/spring.scad
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@ -19,6 +19,8 @@
// //
//! Compression springs. Can be tapered, have open, closed or ground ends. Ground ends will render a lot slower. //! Compression springs. Can be tapered, have open, closed or ground ends. Ground ends will render a lot slower.
//!
//! By default springs have their origin at the bottom but can be centered.
// //
include <../core.scad> include <../core.scad>
@ -64,7 +66,7 @@ function comp_spring(type, l = 0) = //! Calculate the mesh for spring
profile = circle_points(wire_d / 2 - eps, $fn = 16) profile = circle_points(wire_d / 2 - eps, $fn = 16)
) concat(type, [concat(sweep(path, profile), [l])]); ) concat(type, [concat(sweep(path, profile), [l])]);
module comp_spring(type, l = 0) { //! Draw specified spring, l can be set to specify the compressed length. module comp_spring(type, l = 0, center = false) { //! Draw specified spring, l can be set to specify the compressed length.
length = spring_length(type); length = spring_length(type);
closed = spring_closed(type); closed = spring_closed(type);
od = spring_od(type); od = spring_od(type);
@ -79,14 +81,17 @@ module comp_spring(type, l = 0) { //! Draw specified spring, l can be set to spe
mesh = len(type) > 9 ? spring_mesh(type) : spring_mesh(comp_spring(type, l)); mesh = len(type) > 9 ? spring_mesh(type) : spring_mesh(comp_spring(type, l));
assert(l == mesh[2], "can't change the length of a pre-generated spring"); assert(l == mesh[2], "can't change the length of a pre-generated spring");
color(spring_colour(type)) len = l ? l : length;
if(ground) translate_z(center ? - len / 2 : 0) {
clip(zmin = 0, zmax = h) color(spring_colour(type))
if(ground)
clip(zmin = 0, zmax = h)
polyhedron(mesh[0], mesh[1]);
else
polyhedron(mesh[0], mesh[1]); polyhedron(mesh[0], mesh[1]);
else
polyhedron(mesh[0], mesh[1]);
if($children) if($children)
translate_z(l) translate_z(len)
children(); children();
}
} }