X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=src%2FValues.hs;h=d7ede8399391b3229a1c7a6d36f04fececd3674b;hb=de6759db987b07efdd5bf1f238f2d0d9eb8d3d4c;hp=614fb75991359ff8f47c80969721a5bb75598d51;hpb=c93a9fd2d3623feb4e87678685c71a8940e98869;p=spline3.git

diff --git a/src/Values.hs b/src/Values.hs
index 614fb75..d7ede83 100644
--- a/src/Values.hs
+++ b/src/Values.hs
@@ -87,3 +87,8 @@ zoom_shape (sfx, sfy, sfz) sh =
         z' = z * sfz
     in
       (Z :. x' :. y' :. z')
+
+
+drop_z :: DIM3 -> DIM2
+drop_z (Z :. 1 :. y :. x) = (Z :. y :. x)
+drop_z _ = error "can't drop the z-dimension unless its size is 1"