tdf#130076 Fixed flip not working properly from file

Added code to check whether the angles need to be changed when the
section is flipped.

Change-Id: I9cc3e16db74c6e9616385bc39849e4c73686b56c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/127853
Tested-by: Jenkins
Reviewed-by: Regina Henschel <rb.henschel@t-online.de>

1 files changed, 24 insertions, 1 deletions

diff --git a/xmloff/source/draw/ximpshap.cxx b/xmloff/source/draw/ximpshap.cxx
index 4d2dec38a3c8..a19a6c19d936 100644
--- a/xmloff/source/draw/ximpshap.cxx
+++ b/xmloff/source/draw/ximpshap.cxx
@@ -1172,7 +1172,6 @@ void SdXMLEllipseShapeContext::startFastElement (sal_Int32 nElement,
         maPosition.X = mnCX - mnRX;
         maPosition.Y = mnCY - mnRY;
     }
-
     // set pos, size, shear and rotate
     SetTransformation();
 
@@ -1181,6 +1180,30 @@ void SdXMLEllipseShapeContext::startFastElement (sal_Int32 nElement,
         uno::Reference< beans::XPropertySet > xPropSet( mxShape, uno::UNO_QUERY );
         if( xPropSet.is() )
         {
+            // calculate the correct start and end angle
+            sal_Int32 mnOldStartAngle = mnStartAngle;
+            sal_Int32 mnOldEndAngle = mnEndAngle;
+            basegfx::B2DTuple aScale;
+            basegfx::B2DTuple aTranslate;
+            double fRotate;
+            double fShearX;
+            maUsedTransformation.decompose(aScale, aTranslate, fRotate, fShearX);
+            if (aScale.getX() < 0 || aScale.getY() < 0)
+            {
+                // The angle for a horizontal flip is the same as the angle for a
+                // vertical flip because a vertical flip is treated as a horizontal
+                // flip plus a rotation.
+
+                // To perform the flip, the start and end angle are switched and we
+                // use the fact performing a horizontal flip on a shape will change
+                // the angle that a radius makes with the origin to 180 degrees
+                // minus that angle (we use 54000 hundredths of a degree to get the
+                // modulus operation to give a value between 0 and 36000).
+
+                mnStartAngle = (54000 - mnOldEndAngle) % 36000;
+                mnEndAngle = (54000 - mnOldStartAngle) % 36000;
+            }
+
             xPropSet->setPropertyValue("CircleKind", Any( meKind) );
             xPropSet->setPropertyValue("CircleStartAngle", Any(mnStartAngle) );
             xPropSet->setPropertyValue("CircleEndAngle", Any(mnEndAngle) );