From a5bf67d402291c9adb90723a5359e8ac40762ad1 Mon Sep 17 00:00:00 2001
From: azv <azv@opencascade.com>
Date: Tue, 8 Sep 2015 15:21:32 +0300
Subject: [PATCH] Update coordinates of a point coincided with line, arc or
 circle (issue #883)

---
 .../SketchPlugin_ConstraintCoincidence.cpp    | 85 ++++++++++++++++++-
 .../SketchPlugin_ConstraintCoincidence.h      |  4 +
 2 files changed, 88 insertions(+), 1 deletion(-)

diff --git a/src/SketchPlugin/SketchPlugin_ConstraintCoincidence.cpp b/src/SketchPlugin/SketchPlugin_ConstraintCoincidence.cpp
index 85a255bfb..b1fb8be97 100644
--- a/src/SketchPlugin/SketchPlugin_ConstraintCoincidence.cpp
+++ b/src/SketchPlugin/SketchPlugin_ConstraintCoincidence.cpp
@@ -6,13 +6,25 @@
 
 #include "SketchPlugin_ConstraintCoincidence.h"
 
+#include <SketchPlugin_Arc.h>
+#include <SketchPlugin_Circle.h>
+#include <SketchPlugin_Line.h>
+#include <SketchPlugin_Point.h>
+
 #include <SketcherPrs_Factory.h>
 
 #include <ModelAPI_AttributeDouble.h>
 #include <ModelAPI_Data.h>
-#include <SketchPlugin_Point.h>
 #include <GeomDataAPI_Dir.h>
 #include <GeomDataAPI_Point.h>
+#include <GeomDataAPI_Point2D.h>
+
+#include <GeomAPI_Circ2d.h>
+#include <GeomAPI_Dir2d.h>
+#include <GeomAPI_Lin2d.h>
+
+/// \brief Update coordinates of the point to be correctly placed on the feature
+static void adjustPointOnEntity(std::shared_ptr<GeomDataAPI_Point2D> thePoint, FeaturePtr theFeature);
 
 SketchPlugin_ConstraintCoincidence::SketchPlugin_ConstraintCoincidence()
 {
@@ -39,3 +51,74 @@ AISObjectPtr SketchPlugin_ConstraintCoincidence::getAISObject(AISObjectPtr thePr
   }
   return anAIS;
 }
+
+void SketchPlugin_ConstraintCoincidence::attributeChanged(const std::string& theID)
+{
+  if (theID == ENTITY_A() || theID == ENTITY_B()) {
+    AttributeRefAttrPtr anAttrA = 
+        std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(attribute(ENTITY_A()));
+    AttributeRefAttrPtr anAttrB = 
+        std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(attribute(ENTITY_B()));
+
+    if (!anAttrA || !anAttrB || (!anAttrA->isObject() && !anAttrB->isObject()))
+      return;
+
+    if (anAttrA->isObject()) {
+      AttributeRefAttrPtr aTransient = anAttrA;
+      anAttrA = anAttrB;
+      anAttrB = aTransient;
+    }
+
+    std::shared_ptr<GeomDataAPI_Point2D> aPoint =
+        std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttrA->attr());
+    FeaturePtr aFeature;
+    if (anAttrB->object())
+      aFeature = ModelAPI_Feature::feature(anAttrB->object());
+
+    // Adjust position of a point lying on a line or arc
+    if (aPoint && aFeature)
+      adjustPointOnEntity(aPoint, aFeature);
+  }
+}
+
+
+
+
+// =======   Auxiliary functions   ================================================
+void adjustPointOnEntity(std::shared_ptr<GeomDataAPI_Point2D> thePoint, FeaturePtr theFeature)
+{
+  if (theFeature->getKind() == SketchPlugin_Line::ID()) {
+    // project point on line
+    std::shared_ptr<GeomDataAPI_Point2D> aStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
+        theFeature->attribute(SketchPlugin_Line::START_ID()));
+    std::shared_ptr<GeomDataAPI_Point2D> aEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
+        theFeature->attribute(SketchPlugin_Line::END_ID()));
+
+    std::shared_ptr<GeomAPI_Lin2d> aLine(new GeomAPI_Lin2d(aStart->pnt(), aEnd->pnt()));
+    std::shared_ptr<GeomAPI_Pnt2d> aProjected = aLine->project(thePoint->pnt());
+    thePoint->setValue(aProjected);
+  }
+  else if (theFeature->getKind() == SketchPlugin_Circle::ID()) {
+    // project point on circle
+    std::shared_ptr<GeomDataAPI_Point2D> aCenter = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
+        theFeature->attribute(SketchPlugin_Circle::CENTER_ID()));
+    double aRadius = theFeature->real(SketchPlugin_Circle::RADIUS_ID())->value();
+
+    std::shared_ptr<GeomAPI_Dir2d> aDir(new GeomAPI_Dir2d(1.0, 0.0));
+    std::shared_ptr<GeomAPI_Circ2d> aCircle(new GeomAPI_Circ2d(aCenter->pnt(), aDir, aRadius));
+
+    std::shared_ptr<GeomAPI_Pnt2d> aProjected = aCircle->project(thePoint->pnt());
+    thePoint->setValue(aProjected);
+  }
+  else if (theFeature->getKind() == SketchPlugin_Arc::ID()) {
+    // project point on arc
+    std::shared_ptr<GeomDataAPI_Point2D> aCenter = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
+        theFeature->attribute(SketchPlugin_Arc::CENTER_ID()));
+    std::shared_ptr<GeomDataAPI_Point2D> aStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
+        theFeature->attribute(SketchPlugin_Arc::START_ID()));
+
+    std::shared_ptr<GeomAPI_Circ2d> aCircle(new GeomAPI_Circ2d(aCenter->pnt(), aStart->pnt()));
+    std::shared_ptr<GeomAPI_Pnt2d> aProjected = aCircle->project(thePoint->pnt());
+    thePoint->setValue(aProjected);
+  }
+}
diff --git a/src/SketchPlugin/SketchPlugin_ConstraintCoincidence.h b/src/SketchPlugin/SketchPlugin_ConstraintCoincidence.h
index ffc4ce1b9..c9deb1e35 100644
--- a/src/SketchPlugin/SketchPlugin_ConstraintCoincidence.h
+++ b/src/SketchPlugin/SketchPlugin_ConstraintCoincidence.h
@@ -44,6 +44,10 @@ class SketchPlugin_ConstraintCoincidence : public SketchPlugin_ConstraintBase
   /// \brief Request for initialization of data model of the feature: adding all attributes
   SKETCHPLUGIN_EXPORT virtual void initAttributes();
 
+  /// Called on change of any argument-attribute of this object
+  /// \param theID identifier of changed attribute
+  SKETCHPLUGIN_EXPORT virtual void attributeChanged(const std::string& theID);
+
   /// \brief Use plugin manager for features creation
   SketchPlugin_ConstraintCoincidence();
 };
-- 
2.39.2