fixed issue with bad transfrom matrix

src/adaptors/UBSvgSubsetAdaptor.cpp

@@ -1216,23 +1216,23 @@ bool UBSvgSubsetAdaptor::UBSvgSubsetWriter::persistScene(int pageIndex)
 
                 foreach(QGraphicsItem* item, strokesGroupItem->childItems()) {
                     UBGraphicsPolygonItem* poly = qgraphicsitem_cast<UBGraphicsPolygonItem*>(item);
-                    if (!poly) {
+                    if (!poly)
                         continue;
-                    } else if (!resultPoly) {
+                    if (!resultPoly) {
                         resultPoly = poly;
                         continue;
                     }
-                    QPolygonF newPolygon = poly->sceneTransform().map(poly->polygon());
-                    QPainterPath strokePainterPath;
-                    strokePainterPath.addPolygon(resultPoly->sceneTransform().map(resultPoly->polygon()));
-                    QPolygonF oldPolygons = strokePainterPath.simplified().toFillPolygon(resultPoly->sceneTransform().inverted());
-                    newPolygon = oldPolygons.united(newPolygon);
-                    resultPoly->setPolygon(newPolygon);
 
-                    //
+                    QPolygonF unitedPolygon = resultPoly->polygon().united(poly->polygon());
+                    resultPoly->setPolygon(unitedPolygon);
                     items.removeOne(poly);
                 }
                 if (resultPoly) {
+                    //Claudio: the painter path simplification remove all the polygons overlap
+                    QPainterPath painterPath;
+                    painterPath.addPolygon(resultPoly->polygon());
+                    painterPath = painterPath.simplified();
+                    resultPoly->setPolygon(painterPath.toFillPolygon());
                     polygonItemToSvgPolygon(resultPoly, true);
                     items.removeOne(resultPoly);
                 }
@@ -1242,9 +1242,7 @@ bool UBSvgSubsetAdaptor::UBSvgSubsetWriter::persistScene(int pageIndex)
             UBGraphicsPolygonItem *polygonItem = qgraphicsitem_cast<UBGraphicsPolygonItem*> (item);
             if (polygonItem && polygonItem->isVisible())
             {
-
                 UBGraphicsStroke* currentStroke = polygonItem->stroke();
-
                 if (openStroke && (currentStroke != openStroke))
                 {
                     mXmlWriter.writeEndElement(); //g