[composer] Correct placement of cross grids (fix #10626)

src/core/composer/qgscomposermap.cpp

@@ -1480,7 +1480,7 @@ void QgsComposerMap::drawGrid( QPainter* p )
     {
       //start mark
       crossEnd1 = QgsSymbolLayerV2Utils::pointOnLineWithDistance( vIt->second.p1(), vIt->second.p2(), mCrossLength );
-      drawGridLine( QLineF( vIt->second.p1(), crossEnd1 ), context );
+      drawGridLine( QLineF( vIt->second.p1() * dotsPerMM, crossEnd1 * dotsPerMM ), context );
 
       //test for intersection with every horizontal line
       hIt = horizontalLines.constBegin();
@@ -1490,20 +1490,20 @@ void QgsComposerMap::drawGrid( QPainter* p )
         {
           crossEnd1 = QgsSymbolLayerV2Utils::pointOnLineWithDistance( intersectionPoint, vIt->second.p1(), mCrossLength );
           crossEnd2 = QgsSymbolLayerV2Utils::pointOnLineWithDistance( intersectionPoint, vIt->second.p2(), mCrossLength );
-          drawGridLine( QLineF( crossEnd1, crossEnd2 ), context );
+          drawGridLine( QLineF( crossEnd1 * dotsPerMM, crossEnd2 * dotsPerMM ), context );
         }
       }
       //end mark
       QPointF crossEnd2 = QgsSymbolLayerV2Utils::pointOnLineWithDistance( vIt->second.p2(), vIt->second.p1(), mCrossLength );
-      drawGridLine( QLineF( vIt->second.p2(), crossEnd2 ), context );
+      drawGridLine( QLineF( vIt->second.p2() * dotsPerMM, crossEnd2 * dotsPerMM ), context );
     }
 
     hIt = horizontalLines.constBegin();
     for ( ; hIt != horizontalLines.constEnd(); ++hIt )
     {
       //start mark
       crossEnd1 = QgsSymbolLayerV2Utils::pointOnLineWithDistance( hIt->second.p1(), hIt->second.p2(), mCrossLength );
-      drawGridLine( QLineF( hIt->second.p1(), crossEnd1 ), context );
+      drawGridLine( QLineF( hIt->second.p1() * dotsPerMM, crossEnd1 * dotsPerMM ), context );
 
       vIt = verticalLines.constBegin();
       for ( ; vIt != verticalLines.constEnd(); ++vIt )
@@ -1512,12 +1512,12 @@ void QgsComposerMap::drawGrid( QPainter* p )
         {
           crossEnd1 = QgsSymbolLayerV2Utils::pointOnLineWithDistance( intersectionPoint, hIt->second.p1(), mCrossLength );
           crossEnd2 = QgsSymbolLayerV2Utils::pointOnLineWithDistance( intersectionPoint, hIt->second.p2(), mCrossLength );
-          drawGridLine( QLineF( crossEnd1, crossEnd2 ), context );
+          drawGridLine( QLineF( crossEnd1 * dotsPerMM, crossEnd2 * dotsPerMM ), context );
         }
       }
       //end mark
       crossEnd1 = QgsSymbolLayerV2Utils::pointOnLineWithDistance( hIt->second.p2(), hIt->second.p1(), mCrossLength );
-      drawGridLine( QLineF( hIt->second.p2(), crossEnd1 ), context );
+      drawGridLine( QLineF( hIt->second.p2() * dotsPerMM, crossEnd1 * dotsPerMM ), context );
     }
   }
   // reset composition mode

tests/src/core/testqgscomposermap.cpp

@@ -37,6 +37,7 @@ class TestQgsComposerMap: public QObject
     void cleanup();// will be called after every testfunction.
     void render(); //test if rendering of the composition with composr map is correct
     void grid(); //test if grid and grid annotation works
+    void crossGrid(); //test if grid "cross" mode works
     void overviewMap(); //test if overview map frame works
     void overviewMapBlending(); //test if blend modes with overview map frame works
     void overviewMapInvert(); //test if invert of overview map frame works
@@ -139,6 +140,26 @@ void TestQgsComposerMap::grid()
   QVERIFY( testResult );
 }
 
+void TestQgsComposerMap::crossGrid()
+{
+  mComposerMap->setNewExtent( QgsRectangle( 781662.375, 3339523.125, 793062.375, 3345223.125 ) );
+  mComposerMap->setGridEnabled( true );
+  mComposerMap->setGridStyle( QgsComposerMap::Cross );
+  mComposerMap->setCrossLength( 2.0 );
+  mComposerMap->setGridIntervalX( 2000 );
+  mComposerMap->setGridIntervalY( 2000 );
+  mComposerMap->setShowGridAnnotation( false );
+  mComposerMap->setGridPenWidth( 0.5 );
+  mComposerMap->setGridPenColor( QColor( 0, 255, 0 ) );
+  mComposerMap->setGridBlendMode( QPainter::CompositionMode_SourceOver );
+  QgsCompositionChecker checker( "composermap_crossgrid", mComposition );
+
+  bool testResult = checker.testComposition( mReport, 0, 100 );
+  mComposerMap->setGridEnabled( false );
+  mComposerMap->setShowGridAnnotation( false );
+  QVERIFY( testResult );
+}
+
 void TestQgsComposerMap::overviewMap()
 {
   QgsComposerMap* overviewMap = new QgsComposerMap( mComposition, 20, 130, 70, 70 );