diff options
Diffstat (limited to 'Build/source/utils/asymptote/transform.h')
| -rw-r--r-- | Build/source/utils/asymptote/transform.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Build/source/utils/asymptote/transform.h b/Build/source/utils/asymptote/transform.h index 9b0e402da39..41c1f176051 100644 --- a/Build/source/utils/asymptote/transform.h +++ b/Build/source/utils/asymptote/transform.h @@ -217,6 +217,14 @@ inline transform reflectabout(pair z, pair w) return basis * flip * inverse(basis); } +// Return the rotational part of t. +inline transform rotation(transform t) +{ + pair z(2.0*t.getxx()*t.getyy(),t.getyx()*t.getyy()-t.getxx()*t.getxy()); + if(t.getxx() < 0) z=-z; + return rotate(atan2(z.gety(),z.getx())); +} + // Remove the x and y components, so the new transform maps zero to zero. inline transform shiftless(transform t) { |