Fix missing cases and push

Author: lbartoletti

src/core/geometry/qgsgeometryutils.cpp

@@ -285,6 +285,28 @@ bool QgsGeometryUtils::segmentIntersection( const QgsPoint &p1, const QgsPoint &
       inter == p2;
       return true;
     }
+
+    double x, y;
+    if ( qgsDoubleNear( QgsGeometryUtils::sqrDistToLine( p1.x(), p1.y(), q1.x(), q1.y(), q2.x(), q2.y(), x, y, tolerance ), 0.0, tolerance ) )
+    {
+      inter == p1;
+      return true;
+    }
+    else if ( qgsDoubleNear( QgsGeometryUtils::sqrDistToLine( p2.x(), p2.y(), q1.x(), q1.y(), q2.x(), q2.y(), x, y, tolerance ), 0.0, tolerance ) )
+    {
+      inter == p2;
+      return true;
+    }
+    else if ( qgsDoubleNear( QgsGeometryUtils::sqrDistToLine( q1.x(), q1.y(), p1.x(), p1.y(), p2.x(), p2.y(), x, y, tolerance ), 0.0, tolerance ) )
+    {
+      inter == q1;
+      return true;
+    }
+    else if ( qgsDoubleNear( QgsGeometryUtils::sqrDistToLine( q2.x(), q2.y(), p1.x(), p1.y(), p2.x(), p2.y(), x, y, tolerance ), 0.0, tolerance ) )
+    {
+      inter == q2;
+      return true;
+    }
   }
 
   double lambdav = QgsVector( inter.x() - p1.x(), inter.y() - p1.y() ) *  v;

tests/src/core/testqgsgeometryutils.cpp

@@ -707,10 +707,42 @@ void TestQgsGeometryUtils::testSegmentIntersection()
   QVERIFY( isIntersect );
   QVERIFY( inter == QgsPoint( 0, 2 ) );
   inter = QgsPoint();
-  intersection = QgsGeometryUtils::segmentIntersection( QgsPoint( 0, 0 ), QgsPoint( 0, 5 ), QgsPoint( 0, 5 ), QgsPoint( 1, 5 ), inter, isIntersect, epsilon, true );
+  intersection = QgsGeometryUtils::segmentIntersection( QgsPoint( 0, 2 ), QgsPoint( 1, 5 ), QgsPoint( 0, 0 ), QgsPoint( 0, 5 ), inter, isIntersect, epsilon, true );
   QVERIFY( intersection );
   QVERIFY( isIntersect );
-  QVERIFY( inter == QgsPoint( 0, 5 ) );
+  QVERIFY( inter == QgsPoint( 0, 2 ) );
+
+  inter = QgsPoint();
+  intersection = QgsGeometryUtils::segmentIntersection( QgsPoint( 1, 5 ), QgsPoint( 0, 2 ), QgsPoint( 0, 0 ), QgsPoint( 0, 5 ), inter, isIntersect, epsilon );
+  QVERIFY( !intersection );
+  QVERIFY( isIntersect );
+  QVERIFY( inter == QgsPoint( 0, 2 ) );
+  inter = QgsPoint();
+  intersection = QgsGeometryUtils::segmentIntersection( QgsPoint( 1, 5 ), QgsPoint( 0, 2 ), QgsPoint( 0, 0 ), QgsPoint( 0, 5 ), inter, isIntersect, epsilon, true );
+  QVERIFY( intersection );
+  QVERIFY( isIntersect );
+  QVERIFY( inter == QgsPoint( 0, 2 ) );
+
+  inter = QgsPoint();
+  intersection = QgsGeometryUtils::segmentIntersection( QgsPoint( 0, 0 ), QgsPoint( 0, 5 ), QgsPoint( 0, 2 ), QgsPoint( 1, 5 ), inter, isIntersect, epsilon );
+  QVERIFY( !intersection );
+  QVERIFY( isIntersect );
+  QVERIFY( inter == QgsPoint( 0, 2 ) );
+  inter = QgsPoint();
+  intersection = QgsGeometryUtils::segmentIntersection( QgsPoint( 0, 0 ), QgsPoint( 0, 5 ), QgsPoint( 0, 2 ), QgsPoint( 1, 5 ), inter, isIntersect, epsilon, true );
+  QVERIFY( intersection );
+  QVERIFY( isIntersect );
+  QVERIFY( inter == QgsPoint( 0, 2 ) );
+
+  inter = QgsPoint();
+  intersection = QgsGeometryUtils::segmentIntersection( QgsPoint( 0, 0 ), QgsPoint( 0, 5 ), QgsPoint( 1, 5 ), QgsPoint( 0, 2 ), inter, isIntersect, epsilon );
+  QVERIFY( !intersection );
+  QVERIFY( isIntersect );
+  QVERIFY( inter == QgsPoint( 0, 2 ) );
+  intersection = QgsGeometryUtils::segmentIntersection( QgsPoint( 0, 0 ), QgsPoint( 0, 5 ), QgsPoint( 1, 5 ), QgsPoint( 0, 2 ), inter, isIntersect, epsilon, true );
+  QVERIFY( intersection );
+  QVERIFY( isIntersect );
+  QVERIFY( inter == QgsPoint( 0, 2 ) );
   // normal
   inter = QgsPoint();
   intersection = QgsGeometryUtils::segmentIntersection( QgsPoint( 0, -5 ), QgsPoint( 0, 5 ), QgsPoint( 2, 0 ), QgsPoint( -1, 0 ), inter, isIntersect, epsilon );