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| author | bulia byak <buliabyak@gmail.com> | 2006-06-30 03:54:17 +0000 |
|---|---|---|
| committer | buliabyak <buliabyak@users.sourceforge.net> | 2006-06-30 03:54:17 +0000 |
| commit | 77500530cb0602331abb46a9677bc932b1e758f4 (patch) | |
| tree | 602dd2a877db9b2a3023b9a162c01016dc546c8c /src | |
| parent | New placeholder code for gradients (diff) | |
| download | inkscape-77500530cb0602331abb46a9677bc932b1e758f4.tar.gz inkscape-77500530cb0602331abb46a9677bc932b1e758f4.zip | |
add methods to identify scales and rotations
(bzr r1326)
Diffstat (limited to 'src')
| -rw-r--r-- | src/libnr/nr-matrix.cpp | 20 | ||||
| -rw-r--r-- | src/libnr/nr-matrix.h | 10 |
2 files changed, 30 insertions, 0 deletions
diff --git a/src/libnr/nr-matrix.cpp b/src/libnr/nr-matrix.cpp index 24fa2e206..12a2f2fcb 100644 --- a/src/libnr/nr-matrix.cpp +++ b/src/libnr/nr-matrix.cpp @@ -522,6 +522,26 @@ bool Matrix::is_translation(Coord const eps) const { } +/** + * + */ +bool Matrix::is_scale(Coord const eps) const { + return ( (fabs(_c[0] - 1.0) > eps || fabs(_c[3] - 1.0) > eps) && + fabs(_c[1]) < eps && + fabs(_c[2]) < eps ); +} + + +/** + * + */ +bool Matrix::is_rotation(Coord const eps) const { + return ( fabs(_c[1]) > eps && + fabs(_c[2]) > eps && + fabs(_c[1] + _c[2]) < 2 * eps); +} + + diff --git a/src/libnr/nr-matrix.h b/src/libnr/nr-matrix.h index 47196137e..767c2105b 100644 --- a/src/libnr/nr-matrix.h +++ b/src/libnr/nr-matrix.h @@ -248,6 +248,16 @@ class Matrix { */ bool is_translation(Coord const eps = 1e-6) const; + /** + * + */ + bool is_scale(Coord const eps = 1e-6) const; + + /** + * + */ + bool is_rotation(Coord const eps = 1e-6) const; + /** * |