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updated polysections

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Justin Lin
2017-05-10 16:27:35 +08:00
parent 81b0b6dd6b
commit 2f13a9f2bd
2 changed files with 7 additions and 24 deletions
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18
docs/lib-polysections.md
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@@ -14,26 +14,14 @@ You can also view it as a better polyline3d module if you want. If you have only
When using this module, you should use points to represent each cross-section.
You need to provide indexes of triangles, too. This module provides three prepared triangles indexes. One is `"RADIAL"`. For example, if you have a cross-section such as:
![polysections](images/lib-polysections-3.JPG)
When using `"RADIAL"` (default), the module will cut them into triangles from the first point to each remaining point:
![polysections](images/lib-polysections-4.JPG)
If your cross-sections are hollow, you may use `"HOLLOW"`. For example:
If your 2D shape is not solid, indexes of triangles are required. This module has a built-in index vector suitable for one type of hollow shapes. For example, if you have a cross-section such as:
![polysections](images/lib-polysections-5.JPG)
When using `"HOLLOW"`, the above shape will be cut into triangles such as:
When `triangles` is `"HOLLOW"`, the above shape will be cut into triangles such as:
![polysections](images/lib-polysections-6.JPG)
When using `"TAPE"`, a tape shape will be cut into triangles such as:
![polysections](images/lib-polysections-10.JPG)
You can cut triangles by yourself, for example, the indexes of the above triangles is:
[
@@ -50,7 +38,7 @@ Triangles may be defined in any order.
## Parameters
- `sections` : A list of cross-sections. Each cross-section is represented by a list of points. See the example below.
- `triangles` : `"RADIAL"` (default), `"HOLLOW"`, `"TAPE"` or user-defined indexes. See example below.
- `triangles` : `"SOLID"` (default), `"HOLLOW"`, or user-defined indexes. See example below.
## Examples

13
src/polysections.scad
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@@ -11,10 +11,9 @@
*
**/
include <__private__/__triangles_radial.scad>;
include <__private__/__triangles_tape.scad>;
module polysections(sections, triangles) {
module polysections(sections, triangles = "SOLID") {
module solid_sections() {
leng_sections = len(sections);
leng_pts_section = len(sections[0]);
@@ -80,12 +79,8 @@ module polysections(sections, triangles) {
)
) idxes;
function tris() = triangles == "RADIAL" ? __triangles_radial(sections[0]) :
(
triangles == "HOLLOW" ? hollow_tris() : (
triangles == "TAPE" ? __triangles_tape(sections[0]) : triangles
)
);
function tris() =
triangles == "HOLLOW" ? hollow_tris() : triangles;
module two_sections(section1, section2) {
for(idx = tris()) {
@@ -114,7 +109,7 @@ module polysections(sections, triangles) {
}
//
if(triangles == undef) {
if(triangles == "SOLID") {
solid_sections();
} else {
triangles_defined_sections();