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update doc

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Justin Lin
2019-05-20 17:20:08 +08:00
parent 7c38ea2009
commit 4e3016859c
2 changed files with 36 additions and 2 deletions
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docs/lib-path_scaling_sections.md
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@@ -1,6 +1,10 @@
# path_scaling_sections # path_scaling_sections
Given a edge path with the first point [x, 0, 0] or [0, y, 0] at the outline of a shape. This function use the path to calculate scaling factors and returns all scaled sections. Combined with the `polysections` module, you can create a extrusion with the path as an edge. Given an edge path with the first point at the outline of a shape. This function uses the path to calculate scaling factors and returns all scaled sections. Combined with the `polysections` module, you can create an extrusion with the path as an edge.
In order to control scaling factors easily, I suggest using `[x, 0, 0]` as the first point and keeping y = 0 while building the edge path.
You can use any point as the first point of the edge path. Just remember that your edge path radiates from the origin.
**Since:** 1.2. **Since:** 1.2.
@@ -96,4 +100,34 @@ Given a edge path with the first point [x, 0, 0] or [0, y, 0] at the outline of
polysections(rotated_sections); polysections(rotated_sections);
![path_scaling_sections](images/lib-path_scaling_sections-3.JPG) ![path_scaling_sections](images/lib-path_scaling_sections-3.JPG)
include <hull_polyline3d.scad>;
include <shape_taiwan.scad>;
include <path_scaling_sections.scad>;
include <m_scaling.scad>;
include <polysections.scad>;
include <rotate_p.scad>;
taiwan = shape_taiwan(100);
/*
You can use any point as the first point of the edge path.
Just remember that your edge path radiates from the origin.
*/
fst_pt = [taiwan[0][0], taiwan[0][1], 0];//[13, 0, 0];
a = atan2(fst_pt[1], fst_pt[0]);
edge_path = [
fst_pt,
fst_pt + rotate_p([0, 0, 10], a),
fst_pt + rotate_p([10, 0, 20], a),
fst_pt + rotate_p([8, 0, 30], a),
fst_pt + rotate_p([10, 0, 40], a),
fst_pt + rotate_p([0, 0, 50], a),
fst_pt + rotate_p([0, 0, 60], a)
];
#hull_polyline3d(edge_path);
polysections(path_scaling_sections(taiwan, edge_path));
![path_scaling_sections](images/lib-path_scaling_sections-4.JPG)