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Justin Lin
2020-03-26 17:33:35 +08:00
parent 39d1af8919
commit ce8783ce65
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@@ -148,7 +148,7 @@ See [examples](examples).
- [ptf/ptf_rotate](https://openhome.cc/eGossip/OpenSCAD/lib2x-ptf_rotate.html)
- [ptf/ptf_x_twist](https://openhome.cc/eGossip/OpenSCAD/lib2x-ptf_x_twist.html)
- [ptf/ptf_y_twist](https://openhome.cc/eGossip/OpenSCAD/lib2x-ptf_y_twist.html)
- ptf/ptf_circle
- [ptf/ptf_circle](https://openhome.cc/eGossip/OpenSCAD/lib2x-ptf_circle.html)
- ptf/ptf_bend
- ptf/ptf_ring
- ptf/ptf_sphere

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docs/lib2x-ptf_circle.md Normal file
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# ptf_circle
Transform a point inside a rectangle to a point inside a circle. You can use it to create something such as a [noisy circle maze](https://github.com/JustinSDK/dotSCAD/blob/master/examples/maze/noisy_circle_maze.scad).
![ptf_circle](images/lib2x-ptf_circle-1.JPG)
**Since:** 2.3.
## Parameters
- `size` : 2 value array `[x, y]`, rectangle with dimensions `x` and `y`.
- `point` : The point to be transformed.
## Examples
use <hull_polyline3d.scad>;
use <ptf/ptf_circle.scad>;
size = [10, 10];
rows = [
for(y = [0:size[1]])
[for(x = [0:size[0]]) [x, y]]
];
columns = [
for(x = [0:size[0]])
[for(y = [0:size[1]]) [x, y]]
];
for(line = rows) {
twisted = [for(p = line) ptf_circle(size, p)];
hull_polyline3d(twisted, thickness = .1);
}
for(line = columns) {
twisted = [for(p = line) ptf_circle(size, p)];
hull_polyline3d(twisted, thickness = .1);
}
![ptf_circle](images/lib2x-ptf_circle-2.JPG)

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/**
* ptf_circle.scad
*
* @copyright Justin Lin, 2020
* @license https://opensource.org/licenses/lgpl-3.0.html
*
* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-ptf_circle.html
*
**/
function ptf_circle(size, point) =
let(
p_offset = -size / 2,