Resolves: #i122525# use X and Y for unit evaluation

(cherry picked from commit a34f3fdf)

Change-Id: Icdb83829917315173be5e824083ed502f6a6a8cb

drawinglayer/source/primitive2d/primitivetools2d.cxx

@@ -31,8 +31,9 @@ namespace drawinglayer
         {
             ::osl::MutexGuard aGuard( m_aMutex );
 
-            // get the current DiscreteUnit
-            const double fDiscreteUnit((rViewInformation.getInverseObjectToViewTransformation() * basegfx::B2DVector(1.0, 0.0)).getLength());
+            // get the current DiscreteUnit, look at X and Y and use the maximum
+            const basegfx::B2DVector aDiscreteVector(rViewInformation.getInverseObjectToViewTransformation() * basegfx::B2DVector(1.0, 1.0));
+            const double fDiscreteUnit(std::min(fabs(aDiscreteVector.getX()), fabs(aDiscreteVector.getY())));
 
             if(getBuffered2DDecomposition().hasElements() && !basegfx::fTools::equal(fDiscreteUnit, getDiscreteUnit()))
             {

drawinglayer/source/processor2d/vclprocessor2d.cxx

@@ -1396,7 +1396,8 @@ namespace drawinglayer
             {
                 const basegfx::BColor aColorA(maBColorModifierStack.getModifiedColor(rCandidate.getColorA()));
                 const basegfx::BColor aColorB(maBColorModifierStack.getModifiedColor(rCandidate.getColorB()));
-                const double fDiscreteUnit((getViewInformation2D().getInverseObjectToViewTransformation() * basegfx::B2DVector(1.0, 0.0)).getLength());
+                const basegfx::B2DVector aDiscreteVector(getViewInformation2D().getInverseObjectToViewTransformation() * basegfx::B2DVector(1.0, 1.0));
+                const double fDiscreteUnit(std::min(fabs(aDiscreteVector.getX()), fabs(aDiscreteVector.getY())));
 
                 // use color distance and discrete lengths to calculate step count
                 const sal_uInt32 nSteps(calculateStepsForSvgGradient(aColorA, aColorB, fDelta, fDiscreteUnit));
@@ -1438,7 +1439,8 @@ namespace drawinglayer
             {
                 const basegfx::BColor aColorA(maBColorModifierStack.getModifiedColor(rCandidate.getColorA()));
                 const basegfx::BColor aColorB(maBColorModifierStack.getModifiedColor(rCandidate.getColorB()));
-                const double fDiscreteUnit((getViewInformation2D().getInverseObjectToViewTransformation() * basegfx::B2DVector(1.0, 0.0)).getLength());
+                const basegfx::B2DVector aDiscreteVector(getViewInformation2D().getInverseObjectToViewTransformation() * basegfx::B2DVector(1.0, 1.0));
+                const double fDiscreteUnit(std::min(fabs(aDiscreteVector.getX()), fabs(aDiscreteVector.getY())));
 
                 // use color distance and discrete lengths to calculate step count
                 const sal_uInt32 nSteps(calculateStepsForSvgGradient(aColorA, aColorB, fDeltaScale, fDiscreteUnit));