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funcs: Add rotate2d
author
Ian Jackson
<ijackson@chiark.greenend.org.uk>
Tue, 2 May 2023 14:43:45 +0000
(15:43 +0100)
committer
Ian Jackson
<ijackson@chiark.greenend.org.uk>
Tue, 2 May 2023 14:43:51 +0000
(15:43 +0100)
(found)
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
funcs.scad.cpp
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diff --git
a/funcs.scad.cpp
b/funcs.scad.cpp
index 5857c933a837f888bf22faedda5b455e6df0e973..c34d15707f8fa76e4db729c54fa9d850aa29edc8 100644
(file)
--- a/
funcs.scad.cpp
+++ b/
funcs.scad.cpp
@@
-24,6
+24,9
@@
function determinant2(m) = (m[0][0] * m[1][1] - m[0][1] * m[1][0]);
function clockwise2d(v) = [v[1], -v[0]];
+function rotate2d(theta, v) = [ v[0] * cos(theta) - v[1] * sin(theta),
+ v[1] * cos(theta) + v[0] * sin(theta) ];
+
// intersection of lines p1..p2 and p3..p4
function line_intersection_2d(p1,p2,p3,p4) = [
// from https://en.wikipedia.org/wiki/Line%E2%80%93line_intersection#Given_two_points_on_each_line