Separate action "Find bottom" for context menu.

[modules/hydro.git] / src / HYDROData / HYDROData_Profile.cxx

diff --git a/src/HYDROData/HYDROData_Profile.cxx b/src/HYDROData/HYDROData_Profile.cxx
index b970af45591789d80234e81da632f4e373fa6715..3a628a74c4b8e321e955cc780f3bca15a1e05bc6 100755 (executable)
--- a/src/HYDROData/HYDROData_Profile.cxx
+++ b/src/HYDROData/HYDROData_Profile.cxx
@@ -663,4 +663,58 @@ void HYDROData_Profile::UpdateLocalCS( double theDx, double theDy )
   SetRightPoint( aPnt, false );
 }
 
+HYDROData_Profile::ProfilePoint HYDROData_Profile::GetBottomPoint() const
+{
+  ProfilePoint aBottom;
+
+  // Get parametric points
+  HYDROData_ProfileUZ::PointsList aParametricPoints = GetParametricPoints();
+  if ( aParametricPoints.Length() < 1 ) {
+    return aBottom;
+  }
+
+  // Calculate midvalue for U parameter
+  Standard_Real anUMidValue = aParametricPoints.First().X();
+  Standard_Real anUMinValue = anUMidValue;
+  Standard_Real anUMaxValue = anUMidValue;
+
+  for ( int i = 2, aNbPoints = aParametricPoints.Size(); i <= aNbPoints; i++ ) {
+    const HYDROData_IPolyline::Point& aParPoint = aParametricPoints.Value( i );
+    Standard_Real anU = aParPoint.X();
+
+    if ( anU < anUMinValue ) {
+      anUMinValue = anU;
+    } else if ( anU > anUMaxValue ) {
+      anUMaxValue = anU;
+    }
+  }
+
+  anUMidValue = ( anUMinValue + anUMaxValue ) / 2;
+
+  // Find index of the parametric point with minimal Z value
+  int aBottomIndex = 1;
+  HYDROData_IPolyline::Point aParBottom = aParametricPoints.First();
+
+  for ( int i = 2, aNbPoints = aParametricPoints.Size(); i <= aNbPoints; i++ ) {
+    const HYDROData_IPolyline::Point& aParPoint = aParametricPoints.Value( i );
+    if ( aParPoint.Y() < aParBottom.Y() ) {
+      aBottomIndex = i;
+      aParBottom = aParPoint;
+    } else if ( aParPoint.Y() == aParBottom.Y() ) {
+      // Check which point is neares to the U = 0.5
+      if ( fabs( aParPoint.X() - anUMidValue ) < fabs( aParBottom.X() - anUMidValue ) ) {
+        aBottomIndex = i;
+        aParBottom = aParPoint;
+      }
+    }
+  }
+
+  // Find the corresponding profile point
+  ProfilePoints aProfilePoints = GetProfilePoints( false );
+  if ( aBottomIndex >= 1 && aBottomIndex <= aProfilePoints.Length() ) {
+    aBottom = aProfilePoints.Value( aBottomIndex );
+  }
+
+  return aBottom;
+}