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refactoed path_extend to shape_path_extend
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Justin Lin
parent
6478d0160e
commit
6e0dac3814
@ -38,7 +38,6 @@ Too many dependencies? Because OpenSCAD doesn't provide namespace management, I
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- [hull_polyline2d](https://openhome.cc/eGossip/OpenSCAD/lib-hull_polyline2d.html)
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- [hexagons](https://openhome.cc/eGossip/OpenSCAD/lib-hexagons.html)
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- [polytransversals](https://openhome.cc/eGossip/OpenSCAD/lib-polytransversals.html)
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- [path_extend](https://openhome.cc/eGossip/OpenSCAD/lib-path_extend.html)
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- 3D
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- [rounded_cube](https://openhome.cc/eGossip/OpenSCAD/lib-rounded_cube.html)
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@ -88,6 +87,7 @@ Too many dependencies? Because OpenSCAD doesn't provide namespace management, I
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- [shape_cyclicpolygon](https://openhome.cc/eGossip/OpenSCAD/lib-shape_cyclicpolygon.html)
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- [shape_pentagram](https://openhome.cc/eGossip/OpenSCAD/lib-shape_pentagram.html)
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- [shape_superformula](https://openhome.cc/eGossip/OpenSCAD/lib-shape_superformula.html)
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- [shape_path_extend](https://openhome.cc/eGossip/OpenSCAD/lib-shape_path_extend.html)
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- 2D Shape Extrusion
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- [path_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-path_extrude.html)
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Before Width: | Height: | Size: 35 KiB After Width: | Height: | Size: 35 KiB |
@ -1,11 +1,11 @@
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# path_extend
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# shape_path_extend
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It extends a 2D stroke along a path. This module is suitable for a path created by a continuous function.
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It depends on the rotate_p function and the polytransversals module. Remember to include "rotate_p.scad" and "polytransversals.scad".
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It extends a 2D stroke along a path to create a 2D shape. This module is suitable for a path created by a continuous function. The returned points can be used with xxx_extrude modules of dotSCAD. The shape points can be also used with the built-in polygon module.
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When using this module, you should use points to represent the 2D stroke.
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It depends on the `rotate_p` function. Remember to include "rotate_p.scad" and "polytransversals.scad".
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## Parameters
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- `stroke_pts` : A list of points represent a stroke. See the example below.
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@ -16,8 +16,7 @@ When using this module, you should use points to represent the 2D stroke.
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## Examples
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include <rotate_p.scad>;
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include <polytransversals.scad>;
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include <path_extend.scad>;
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include <shape_path_extend.scad>;
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include <circle_path.scad>;
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include <archimedean_spiral.scad>;
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@ -25,7 +24,10 @@ When using this module, you should use points to represent the 2D stroke.
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stroke1 = [[-5, 2.5], [-2.5, 0], [0, 2.5], [2.5, 0], [5, 2.5]];
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path_pts1 = circle_path(50, 60);
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path_extend(stroke1, path_pts1);
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polygon(
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shape_path_extend(stroke1, path_pts1)
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);
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stroke2 = [[-4, 0], [0, 4], [4, 0]];
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pts_angles = archimedean_spiral(
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@ -36,9 +38,11 @@ When using this module, you should use points to represent the 2D stroke.
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);
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translate([120, 0, 0])
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path_extend(
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polygon(
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shape_path_extend(
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stroke2,
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[for(pa = pts_angles) pa[0]]
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)
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);
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@ -1,71 +0,0 @@
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/**
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* path_extend.scad
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*
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* It extends a 2D stroke along a path.
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* This module is suitable for a path created by a continuous function.
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* It depends on the rotate_p function and the polytransversals module.
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* Remember to include "rotate_p.scad" and "polytransversals.scad".
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*
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* @copyright Justin Lin, 2017
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* @license https://opensource.org/licenses/lgpl-3.0.html
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*
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* @see https://openhome.cc/eGossip/OpenSCAD/lib-path_extend.html
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*
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**/
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include <__private__/__to3d.scad>;
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include <__private__/__length_between.scad>;
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module path_extend(stroke_pts, path_pts, scale = 1.0, closed = false) {
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function az(p1, p2) =
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let(
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x1 = p1[0],
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y1 = p1[1],
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x2 = p2[0],
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y2 = p2[1]
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) -90 + atan2((y2 - y1), (x2 - x1));
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leng_path_pts = len(path_pts);
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scale_step = (scale - 1) / (leng_path_pts - 1);
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function first_stroke() =
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let(
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p1 = path_pts[0],
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p2 = path_pts[1],
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a = az(p1, p2)
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)
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[
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for(p = stroke_pts)
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rotate_p(p, a) + p1
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];
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function stroke(p1, p2, i) =
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let(
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leng = __length_between(__to3d(p1), __to3d(p2)),
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a = az(p1, p2)
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)
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[
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for(p = stroke_pts)
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rotate_p(p * (1 + scale_step * i) + [0, leng], a) + p1
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];
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function path_extend_inner(index) =
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index == leng_path_pts ? [] :
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concat(
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[stroke(path_pts[index - 1], path_pts[index], index)],
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path_extend_inner(index + 1)
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);
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if(closed && path_pts[0] == path_pts[leng_path_pts - 1]) {
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strokes = path_extend_inner(1);
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polytransversals(
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concat(strokes, [strokes[0]])
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);
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} else {
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polytransversals(
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concat([first_stroke()], path_extend_inner(1))
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);
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}
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}
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82
src/shape_path_extend.scad
Normal file
82
src/shape_path_extend.scad
Normal file
@ -0,0 +1,82 @@
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/**
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* shape_path_extend.scad
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*
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* It extends a 2D stroke along a path.
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* This module is suitable for a path created by a continuous function.
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* It depends on the rotate_p function and the polytransversals module.
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* Remember to include "rotate_p.scad" and "polytransversals.scad".
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*
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* @copyright Justin Lin, 2017
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* @license https://opensource.org/licenses/lgpl-3.0.html
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*
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* @see https://openhome.cc/eGossip/OpenSCAD/lib-path_extend.html
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*
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**/
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include <__private__/__to3d.scad>;
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include <__private__/__length_between.scad>;
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include <__private__/__polytransversals.scad>;
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include <__private__/__reverse.scad>;
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function _shape_path_extend_az(p1, p2) =
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let(
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x1 = p1[0],
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y1 = p1[1],
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x2 = p2[0],
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y2 = p2[1]
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) -90 + atan2((y2 - y1), (x2 - x1));
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function _shape_path_first_stroke(stroke_pts, path_pts) =
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let(
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p1 = path_pts[0],
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p2 = path_pts[1],
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a = _shape_path_extend_az(p1, p2)
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)
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[
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for(p = stroke_pts)
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rotate_p(p, a) + p1
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];
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function _shape_path_extend_stroke(stroke_pts, p1, p2, scale_step, i) =
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let(
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leng = __length_between(__to3d(p1), __to3d(p2)),
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a = _shape_path_extend_az(p1, p2)
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)
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[
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for(p = stroke_pts)
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rotate_p(p * (1 + scale_step * i) + [0, leng], a) + p1
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];
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function _shape_path_extend_inner(stroke_pts, path_pts, leng_path_pts, scale_step, index) =
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index == leng_path_pts ? [] :
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concat(
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[
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_shape_path_extend_stroke(
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stroke_pts,
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path_pts[index - 1],
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path_pts[index],
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scale_step,
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index
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)
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],
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_shape_path_extend_inner(
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stroke_pts,
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path_pts,
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leng_path_pts,
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scale_step,
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index + 1
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)
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);
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function shape_path_extend(stroke_pts, path_pts, scale = 1.0, closed = false) =
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let(
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leng_path_pts = len(path_pts),
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scale_step = (scale - 1) / (leng_path_pts - 1),
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strokes = _shape_path_extend_inner(stroke_pts, path_pts, leng_path_pts, scale_step, 1)
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)
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closed && path_pts[0] == path_pts[leng_path_pts - 1] ?
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__polytransversals(concat(strokes, [strokes[0]])) :
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__polytransversals(
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concat([_shape_path_first_stroke(stroke_pts, path_pts)], strokes)
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);
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