diff options
Diffstat (limited to 'basegfx')
| -rw-r--r-- | basegfx/source/matrix/b2dhommatrixtools.cxx | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/basegfx/source/matrix/b2dhommatrixtools.cxx b/basegfx/source/matrix/b2dhommatrixtools.cxx index a267b05b96d1..26936aff2e5c 100644 --- a/basegfx/source/matrix/b2dhommatrixtools.cxx +++ b/basegfx/source/matrix/b2dhommatrixtools.cxx @@ -358,6 +358,48 @@ namespace basegfx return aRetval; } + BASEGFX_DLLPUBLIC B2DHomMatrix createRotateAroundCenterKeepAspectRatioStayInsideRange( + const basegfx::B2DRange& rTargetRange, + double fRotate) + { + basegfx::B2DHomMatrix aRetval; + + // RotGrfFlyFrame: Take rotation into account. Rotation is in 10th degrees + if(0.0 != fRotate) + { + // Fit rotated graphic to center of available space, keeping page ratio: + // Adapt scaling ratio of unit object and rotate it + aRetval.scale(1.0, rTargetRange.getHeight() / rTargetRange.getWidth()); + aRetval.rotate(fRotate); + + // get the range to see where we are in unit coordinates + basegfx::B2DRange aFullRange(0.0, 0.0, 1.0, 1.0); + aFullRange.transform(aRetval); + + // detect needed scales in X/Y and choose the smallest for staying inside the + // available space while keeping aspect ratio of the source + const double fScaleX(rTargetRange.getWidth() / aFullRange.getWidth()); + const double fScaleY(rTargetRange.getHeight() / aFullRange.getHeight()); + const double fScaleMin(std::min(fScaleX, fScaleY)); + + // TopLeft to zero, then scale, then move to center of available space + aRetval.translate(-aFullRange.getMinX(), -aFullRange.getMinY()); + aRetval.scale(fScaleMin, fScaleMin); + aRetval.translate( + rTargetRange.getCenterX() - (0.5 * fScaleMin * aFullRange.getWidth()), + rTargetRange.getCenterY() - (0.5 * fScaleMin * aFullRange.getHeight())); + } + else + { + // just scale/translate needed + aRetval *= createScaleTranslateB2DHomMatrix( + rTargetRange.getRange(), + rTargetRange.getMinimum()); + } + + return aRetval; + } + /// special for the case to map from source range to target range B2DHomMatrix createSourceRangeTargetRangeTransform( const B2DRange& rSourceRange, |