diff --git a/src/app/container/vcontainer.cpp b/src/app/container/vcontainer.cpp
index 21cfe73c0..98ca648b6 100644
--- a/src/app/container/vcontainer.cpp
+++ b/src/app/container/vcontainer.cpp
@@ -34,7 +34,7 @@
 #include <QLineF>
 #include <QtAlgorithms>
 
-quint32 VContainer::_id = 0;
+quint32 VContainer::_id = NULL_ID;
 
 //---------------------------------------------------------------------------------------------------------------------
 /**
@@ -270,7 +270,7 @@ void VContainer::UpdateId(quint32 newId)
 template <typename val>
 void VContainer::UpdateObject(QHash<quint32, val> &obj, const quint32 &id, val point)
 {
-    Q_ASSERT_X(id > 0, Q_FUNC_INFO, "id <= 0");
+    Q_ASSERT_X(id > NULL_ID, Q_FUNC_INFO, "id = 0");
     SCASSERT(point != nullptr);
     point->setId(id);
     if (gObjects.contains(id))
@@ -288,7 +288,7 @@ void VContainer::UpdateObject(QHash<quint32, val> &obj, const quint32 &id, val p
  */
 void VContainer::Clear()
 {
-    _id = 0;
+    _id = NULL_ID;
 
     details.clear();
     ClearVariables();
@@ -404,7 +404,7 @@ void VContainer::UpdateGObject(quint32 id, VGObject* obj)
  */
 void VContainer::UpdateDetail(quint32 id, const VDetail &detail)
 {
-    Q_ASSERT_X(id > 0, Q_FUNC_INFO, "id <= 0");
+    Q_ASSERT_X(id > NULL_ID, Q_FUNC_INFO, "id = 0");
     details[id] = detail;
     UpdateId(id);
 }
diff --git a/src/app/container/vcurvelength.cpp b/src/app/container/vcurvelength.cpp
index 4dc282544..a9c0cf389 100644
--- a/src/app/container/vcurvelength.cpp
+++ b/src/app/container/vcurvelength.cpp
@@ -32,7 +32,7 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VCurveLength::VCurveLength()
-    :VInternalVariable(), id(0), parentId(0)
+    :VInternalVariable(), id(NULL_ID), parentId(NULL_ID)
 {
     type = VarType::Unknown;
 }
diff --git a/src/app/container/vincrement.cpp b/src/app/container/vincrement.cpp
index 2b65a8406..e45888bcd 100644
--- a/src/app/container/vincrement.cpp
+++ b/src/app/container/vincrement.cpp
@@ -27,13 +27,14 @@
  *************************************************************************/
 
 #include "vincrement.h"
+#include "../options.h"
 
 //---------------------------------------------------------------------------------------------------------------------
 /**
  * @brief VIncrement create enpty increment
  */
 VIncrement::VIncrement()
-    :VVariable(), id(0)
+    :VVariable(), id(NULL_ID)
 {
     type = VarType::Increment;
 }
diff --git a/src/app/container/vlineangle.cpp b/src/app/container/vlineangle.cpp
index 50b56d833..01396d224 100644
--- a/src/app/container/vlineangle.cpp
+++ b/src/app/container/vlineangle.cpp
@@ -34,7 +34,7 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VLineAngle::VLineAngle()
-    :VInternalVariable(), p1Id(0), p2Id(0)
+    :VInternalVariable(), p1Id(NULL_ID), p2Id(NULL_ID)
 {
     type = VarType::LineAngle;
 }
diff --git a/src/app/container/vlinelength.cpp b/src/app/container/vlinelength.cpp
index 0b6713a63..886d63a89 100644
--- a/src/app/container/vlinelength.cpp
+++ b/src/app/container/vlinelength.cpp
@@ -34,7 +34,7 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VLengthLine::VLengthLine()
-    :VInternalVariable(), p1Id(0), p2Id(0)
+    :VInternalVariable(), p1Id(NULL_ID), p2Id(NULL_ID)
 {
     type = VarType::LineLength;
 }
diff --git a/src/app/dialogs/app/configpages/patternpage.cpp b/src/app/dialogs/app/configpages/patternpage.cpp
index 479f469dc..4609fd7c4 100644
--- a/src/app/dialogs/app/configpages/patternpage.cpp
+++ b/src/app/dialogs/app/configpages/patternpage.cpp
@@ -40,7 +40,7 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 PatternPage::PatternPage(QWidget *parent):
-    QWidget(parent), userName(0), graphOutputCheck(0), undoCount(0)
+    QWidget(parent), userName(nullptr), graphOutputCheck(nullptr), undoCount(nullptr)
 {
     QGroupBox *userGroup = UserGroup();
     QGroupBox *graphOutputGroup = GraphOutputGroup();
diff --git a/src/app/dialogs/app/dialogincrements.cpp b/src/app/dialogs/app/dialogincrements.cpp
index 3c6317510..3a43c85c1 100644
--- a/src/app/dialogs/app/dialogincrements.cpp
+++ b/src/app/dialogs/app/dialogincrements.cpp
@@ -48,7 +48,7 @@
  * @param parent parent widget
  */
 DialogIncrements::DialogIncrements(VContainer *data, VPattern *doc, QWidget *parent)
-    :DialogTool(data, 0, parent), ui(new Ui::DialogIncrements), data(data), doc(doc), row(0), column(0), m(nullptr)
+    :DialogTool(data, NULL_ID, parent), ui(new Ui::DialogIncrements), data(data), doc(doc), row(0), column(0), m(nullptr)
 {
     ui->setupUi(this);
 
diff --git a/src/app/dialogs/tools/dialogalongline.cpp b/src/app/dialogs/tools/dialogalongline.cpp
index 2b124ec74..54c597106 100644
--- a/src/app/dialogs/tools/dialogalongline.cpp
+++ b/src/app/dialogs/tools/dialogalongline.cpp
@@ -42,7 +42,8 @@
  */
 DialogAlongLine::DialogAlongLine(const VContainer *data, const quint32 &toolId, QWidget *parent)
     :DialogTool(data, toolId, parent), ui(new Ui::DialogAlongLine), number(0), pointName(QString()),
-      typeLine(QString()), formula(QString()), firstPointId(0), secondPointId(0), formulaBaseHeight(0), line(nullptr)
+      typeLine(QString()), formula(QString()), firstPointId(NULL_ID), secondPointId(NULL_ID), formulaBaseHeight(0),
+      line(nullptr)
 {
     ui->setupUi(this);
     InitVariables(ui);
diff --git a/src/app/dialogs/tools/dialogarc.cpp b/src/app/dialogs/tools/dialogarc.cpp
index aa05e25c4..cd87bdcd9 100644
--- a/src/app/dialogs/tools/dialogarc.cpp
+++ b/src/app/dialogs/tools/dialogarc.cpp
@@ -45,7 +45,7 @@
  */
 DialogArc::DialogArc(const VContainer *data, const quint32 &toolId, QWidget *parent)
     :DialogTool(data, toolId, parent), ui(new Ui::DialogArc), flagRadius(false), flagF1(false), flagF2(false),
-      timerRadius(nullptr), timerF1(nullptr), timerF2(nullptr), center(0), radius(QString()), f1(QString()),
+      timerRadius(nullptr), timerF1(nullptr), timerF2(nullptr), center(NULL_ID), radius(QString()), f1(QString()),
       f2(QString()), formulaBaseHeight(0), formulaBaseHeightF1(0), formulaBaseHeightF2(0), path(nullptr)
 {
     ui->setupUi(this);
diff --git a/src/app/dialogs/tools/dialogbisector.cpp b/src/app/dialogs/tools/dialogbisector.cpp
index 11d2bb6a9..341d6b330 100644
--- a/src/app/dialogs/tools/dialogbisector.cpp
+++ b/src/app/dialogs/tools/dialogbisector.cpp
@@ -43,8 +43,8 @@
  */
 DialogBisector::DialogBisector(const VContainer *data, const quint32 &toolId, QWidget *parent)
     :DialogTool(data, toolId, parent), ui(new Ui::DialogBisector), number(0), pointName(QString()), typeLine(QString()),
-      formula(QString()), firstPointId(0), secondPointId(0), thirdPointId(0), formulaBaseHeight(0), line(nullptr),
-      prepare(false)
+      formula(QString()), firstPointId(NULL_ID), secondPointId(NULL_ID), thirdPointId(NULL_ID), formulaBaseHeight(0),
+      line(nullptr), prepare(false)
 {
     ui->setupUi(this);
     InitVariables(ui);
diff --git a/src/app/dialogs/tools/dialogcutarc.cpp b/src/app/dialogs/tools/dialogcutarc.cpp
index 54327dd10..b5e9620d5 100644
--- a/src/app/dialogs/tools/dialogcutarc.cpp
+++ b/src/app/dialogs/tools/dialogcutarc.cpp
@@ -41,8 +41,8 @@
  * @param parent parent widget
  */
 DialogCutArc::DialogCutArc(const VContainer *data, const quint32 &toolId, QWidget *parent)
-    : DialogTool(data, toolId, parent), ui(new Ui::DialogCutArc), pointName(QString()), formula(QString()), arcId(0),
-      formulaBaseHeight(0), path(nullptr)
+    : DialogTool(data, toolId, parent), ui(new Ui::DialogCutArc), pointName(QString()), formula(QString()),
+      arcId(NULL_ID), formulaBaseHeight(0), path(nullptr)
 {
     ui->setupUi(this);
     InitVariables(ui);
diff --git a/src/app/dialogs/tools/dialogcutspline.cpp b/src/app/dialogs/tools/dialogcutspline.cpp
index beefd1be8..3d8365483 100644
--- a/src/app/dialogs/tools/dialogcutspline.cpp
+++ b/src/app/dialogs/tools/dialogcutspline.cpp
@@ -40,7 +40,7 @@
  */
 DialogCutSpline::DialogCutSpline(const VContainer *data, const quint32 &toolId, QWidget *parent)
     :DialogTool(data, toolId, parent), ui(new Ui::DialogCutSpline), pointName(QString()), formula(QString()),
-      splineId(0), formulaBaseHeight(0)
+      splineId(NULL_ID), formulaBaseHeight(0)
 {
     ui->setupUi(this);
     InitVariables(ui);
diff --git a/src/app/dialogs/tools/dialogcutsplinepath.cpp b/src/app/dialogs/tools/dialogcutsplinepath.cpp
index 827187aad..237c96e0f 100644
--- a/src/app/dialogs/tools/dialogcutsplinepath.cpp
+++ b/src/app/dialogs/tools/dialogcutsplinepath.cpp
@@ -40,7 +40,7 @@
  */
 DialogCutSplinePath::DialogCutSplinePath(const VContainer *data, const quint32 &toolId, QWidget *parent)
     :DialogTool(data, toolId, parent), ui(new Ui::DialogCutSplinePath), pointName(QString()), formula(QString()),
-      splinePathId(0), formulaBaseHeight(0)
+      splinePathId(NULL_ID), formulaBaseHeight(0)
 {
     ui->setupUi(this);
     InitVariables(ui);
diff --git a/src/app/dialogs/tools/dialogendline.cpp b/src/app/dialogs/tools/dialogendline.cpp
index f9785a07a..98c2e895f 100644
--- a/src/app/dialogs/tools/dialogendline.cpp
+++ b/src/app/dialogs/tools/dialogendline.cpp
@@ -43,7 +43,7 @@
  */
 DialogEndLine::DialogEndLine(const VContainer *data, const quint32 &toolId, QWidget *parent)
     :DialogTool(data, toolId, parent), ui(new Ui::DialogEndLine), pointName(QString()), typeLine(QString()),
-      formulaLength(QString()), formulaAngle(QString()), basePointId(0), formulaBaseHeight(0),
+      formulaLength(QString()), formulaAngle(QString()), basePointId(NULL_ID), formulaBaseHeight(0),
       formulaBaseHeightAngle(0), line(nullptr)
 {
     ui->setupUi(this);
diff --git a/src/app/dialogs/tools/dialogheight.cpp b/src/app/dialogs/tools/dialogheight.cpp
index 653277448..d60a2bab7 100644
--- a/src/app/dialogs/tools/dialogheight.cpp
+++ b/src/app/dialogs/tools/dialogheight.cpp
@@ -43,7 +43,7 @@
  */
 DialogHeight::DialogHeight(const VContainer *data, const quint32 &toolId, QWidget *parent)
     :DialogTool(data, toolId, parent), ui(new Ui::DialogHeight), number(0), pointName(QString()),
-    typeLine(QString()), basePointId(0), p1LineId(0), p2LineId(0), line(nullptr)
+    typeLine(QString()), basePointId(NULL_ID), p1LineId(NULL_ID), p2LineId(NULL_ID), line(nullptr)
 {
     ui->setupUi(this);
     labelEditNamePoint = ui->labelEditNamePoint;
diff --git a/src/app/dialogs/tools/dialogline.cpp b/src/app/dialogs/tools/dialogline.cpp
index cad805a5e..081cbbe65 100644
--- a/src/app/dialogs/tools/dialogline.cpp
+++ b/src/app/dialogs/tools/dialogline.cpp
@@ -43,7 +43,7 @@
  * @param parent parent widget
  */
 DialogLine::DialogLine(const VContainer *data, const quint32 &toolId, QWidget *parent)
-    :DialogTool(data, toolId, parent), ui(new Ui::DialogLine), number(0), firstPoint(0), secondPoint(0),
+    :DialogTool(data, toolId, parent), ui(new Ui::DialogLine), number(0), firstPoint(NULL_ID), secondPoint(NULL_ID),
       typeLine(QString()), line(nullptr)
 {
     ui->setupUi(this);
diff --git a/src/app/dialogs/tools/dialoglineintersect.cpp b/src/app/dialogs/tools/dialoglineintersect.cpp
index 19c979528..fcf6eb8cf 100644
--- a/src/app/dialogs/tools/dialoglineintersect.cpp
+++ b/src/app/dialogs/tools/dialoglineintersect.cpp
@@ -42,7 +42,7 @@
  */
 DialogLineIntersect::DialogLineIntersect(const VContainer *data, const quint32 &toolId, QWidget *parent)
     :DialogTool(data, toolId, parent), ui(new Ui::DialogLineIntersect), number(0), pointName(QString()),
-    p1Line1(0), p2Line1(0), p1Line2(0), p2Line2(0), flagPoint(true), line(nullptr)
+    p1Line1(NULL_ID), p2Line1(NULL_ID), p1Line2(NULL_ID), p2Line2(NULL_ID), flagPoint(true), line(nullptr)
 {
     ui->setupUi(this);
     number = 0;
diff --git a/src/app/dialogs/tools/dialognormal.cpp b/src/app/dialogs/tools/dialognormal.cpp
index b24619aa2..47b023fd2 100644
--- a/src/app/dialogs/tools/dialognormal.cpp
+++ b/src/app/dialogs/tools/dialognormal.cpp
@@ -40,7 +40,7 @@
  */
 DialogNormal::DialogNormal(const VContainer *data, const quint32 &toolId, QWidget *parent)
     :DialogTool(data, toolId, parent), ui(new Ui::DialogNormal), number(0), pointName(QString()), typeLine(QString()),
-      formula(QString()), angle(0), firstPointId(0), secondPointId(0), formulaBaseHeight(0), line(nullptr)
+      formula(QString()), angle(0), firstPointId(NULL_ID), secondPointId(NULL_ID), formulaBaseHeight(0), line(nullptr)
 {
     ui->setupUi(this);
     InitVariables(ui);
diff --git a/src/app/dialogs/tools/dialogpointofcontact.cpp b/src/app/dialogs/tools/dialogpointofcontact.cpp
index 5664f2a9b..ca5bb45b8 100644
--- a/src/app/dialogs/tools/dialogpointofcontact.cpp
+++ b/src/app/dialogs/tools/dialogpointofcontact.cpp
@@ -41,7 +41,7 @@
  */
 DialogPointOfContact::DialogPointOfContact(const VContainer *data, const quint32 &toolId, QWidget *parent)
     :DialogTool(data, toolId, parent), ui(new Ui::DialogPointOfContact), number(0), pointName(QString()),
-      radius(QString()), center(0), firstPoint(0), secondPoint(0), formulaBaseHeight(0), line(nullptr)
+      radius(QString()), center(NULL_ID), firstPoint(NULL_ID), secondPoint(NULL_ID), formulaBaseHeight(0), line(nullptr)
 {
     ui->setupUi(this);
     InitVariables(ui);
diff --git a/src/app/dialogs/tools/dialogpointofintersection.cpp b/src/app/dialogs/tools/dialogpointofintersection.cpp
index a8d6cb4d0..de739593e 100644
--- a/src/app/dialogs/tools/dialogpointofintersection.cpp
+++ b/src/app/dialogs/tools/dialogpointofintersection.cpp
@@ -42,7 +42,7 @@
  */
 DialogPointOfIntersection::DialogPointOfIntersection(const VContainer *data, const quint32 &toolId, QWidget *parent)
     :DialogTool(data, toolId, parent), ui(new Ui::DialogPointOfIntersection), number(0), pointName(QString()),
-    firstPointId(0), secondPointId(0), line(nullptr)
+    firstPointId(NULL_ID), secondPointId(NULL_ID), line(nullptr)
 {
     ui->setupUi(this);
     labelEditNamePoint = ui->labelEditNamePoint;
diff --git a/src/app/dialogs/tools/dialogshoulderpoint.cpp b/src/app/dialogs/tools/dialogshoulderpoint.cpp
index 2f6cc298c..551029c7c 100644
--- a/src/app/dialogs/tools/dialogshoulderpoint.cpp
+++ b/src/app/dialogs/tools/dialogshoulderpoint.cpp
@@ -43,7 +43,8 @@
  */
 DialogShoulderPoint::DialogShoulderPoint(const VContainer *data, const quint32 &toolId, QWidget *parent)
     :DialogTool(data, toolId, parent), ui(new Ui::DialogShoulderPoint), number(0), pointName(QString()),
-    typeLine(QString()), formula(QString()), p1Line(0), p2Line(0), pShoulder(0), formulaBaseHeight(0), line (nullptr)
+    typeLine(QString()), formula(QString()), p1Line(NULL_ID), p2Line(NULL_ID), pShoulder(NULL_ID), formulaBaseHeight(0),
+    line (nullptr)
 {
     ui->setupUi(this);
     InitVariables(ui);
diff --git a/src/app/dialogs/tools/dialogspline.cpp b/src/app/dialogs/tools/dialogspline.cpp
index 700fe85fb..7b1f5474e 100644
--- a/src/app/dialogs/tools/dialogspline.cpp
+++ b/src/app/dialogs/tools/dialogspline.cpp
@@ -39,8 +39,8 @@
  * @param parent parent widget
  */
 DialogSpline::DialogSpline(const VContainer *data, const quint32 &toolId, QWidget *parent)
-    :DialogTool(data, toolId, parent), ui(new Ui::DialogSpline), number(0), p1(0), p4(0), angle1(0), angle2(0),
-      kAsm1(1), kAsm2(1), kCurve(1)
+    :DialogTool(data, toolId, parent), ui(new Ui::DialogSpline), number(0), p1(NULL_ID), p4(NULL_ID), angle1(0),
+      angle2(0), kAsm1(1), kAsm2(1), kCurve(1)
 {
     ui->setupUi(this);
     InitOkCancel(ui);
diff --git a/src/app/dialogs/tools/dialogtriangle.cpp b/src/app/dialogs/tools/dialogtriangle.cpp
index 5383350d7..794e71312 100644
--- a/src/app/dialogs/tools/dialogtriangle.cpp
+++ b/src/app/dialogs/tools/dialogtriangle.cpp
@@ -40,8 +40,8 @@
  * @param parent parent widget
  */
 DialogTriangle::DialogTriangle(const VContainer *data, const quint32 &toolId, QWidget *parent)
-    :DialogTool(data, toolId, parent), ui(new Ui::DialogTriangle), number(0), pointName(QString()), axisP1Id(0),
-    axisP2Id(0), firstPointId(0), secondPointId(0), line (nullptr)
+    :DialogTool(data, toolId, parent), ui(new Ui::DialogTriangle), number(0), pointName(QString()), axisP1Id(NULL_ID),
+    axisP2Id(NULL_ID), firstPointId(NULL_ID), secondPointId(NULL_ID), line (nullptr)
 {
     ui->setupUi(this);
     labelEditNamePoint = ui->labelEditNamePoint;
diff --git a/src/app/dialogs/tools/dialoguniondetails.cpp b/src/app/dialogs/tools/dialoguniondetails.cpp
index f993b7e40..fd7de39bd 100644
--- a/src/app/dialogs/tools/dialoguniondetails.cpp
+++ b/src/app/dialogs/tools/dialoguniondetails.cpp
@@ -38,8 +38,8 @@
  * @param parent parent widget
  */
 DialogUnionDetails::DialogUnionDetails(const VContainer *data, const quint32 &toolId, QWidget *parent)
-    :DialogTool(data, toolId, parent), ui(new Ui::DialogUnionDetails), indexD1(0), indexD2(0), d1(0), d2(0), numberD(0),
-    numberP(0), p1(0), p2(0)
+    :DialogTool(data, toolId, parent), ui(new Ui::DialogUnionDetails), indexD1(0), indexD2(0), d1(NULL_ID), d2(NULL_ID),
+      numberD(0), numberP(0), p1(NULL_ID), p2(NULL_ID)
 {
     ui->setupUi(this);
     InitOkCancel(ui);
diff --git a/src/app/exception/vexceptionbadid.cpp b/src/app/exception/vexceptionbadid.cpp
index 7d996e46f..424d0662e 100644
--- a/src/app/exception/vexceptionbadid.cpp
+++ b/src/app/exception/vexceptionbadid.cpp
@@ -27,6 +27,7 @@
  *************************************************************************/
 
 #include "vexceptionbadid.h"
+#include "../options.h"
 
 //---------------------------------------------------------------------------------------------------------------------
 /**
@@ -44,7 +45,7 @@ VExceptionBadId::VExceptionBadId(const QString &what, const quint32 &id)
  * @param key string key
  */
 VExceptionBadId::VExceptionBadId(const QString &what, const QString &key)
-    :VException(what), id(0), key(key){}
+    :VException(what), id(NULL_ID), key(key){}
 
 //---------------------------------------------------------------------------------------------------------------------
 /**
diff --git a/src/app/geometry/vdetail.cpp b/src/app/geometry/vdetail.cpp
index 51a000bfe..6afd219e6 100644
--- a/src/app/geometry/vdetail.cpp
+++ b/src/app/geometry/vdetail.cpp
@@ -32,13 +32,13 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VDetail::VDetail()
-    :_id(0), nodes(QVector<VNodeDetail>()), name(QString()), mx(0), my(0), seamAllowance(true), closed(true),
+    :_id(NULL_ID), nodes(QVector<VNodeDetail>()), name(QString()), mx(0), my(0), seamAllowance(true), closed(true),
       width(0)
 {}
 
 //---------------------------------------------------------------------------------------------------------------------
 VDetail::VDetail(const QString &name, const QVector<VNodeDetail> &nodes)
-    :_id(0), nodes(QVector<VNodeDetail>()), name(name), mx(0), my(0), seamAllowance(true), closed(true),
+    :_id(NULL_ID), nodes(QVector<VNodeDetail>()), name(name), mx(0), my(0), seamAllowance(true), closed(true),
       width(0)
 {
     this->nodes = nodes;
@@ -46,7 +46,7 @@ VDetail::VDetail(const QString &name, const QVector<VNodeDetail> &nodes)
 
 //---------------------------------------------------------------------------------------------------------------------
 VDetail::VDetail(const VDetail &detail)
-    :_id(0), nodes(detail.getNodes()), name(detail.getName()), mx(detail.getMx()), my(detail.getMy()),
+    :_id(NULL_ID), nodes(detail.getNodes()), name(detail.getName()), mx(detail.getMx()), my(detail.getMy()),
       seamAllowance(detail.getSeamAllowance()), closed(detail.getClosed()), width(detail.getWidth())
 {}
 
diff --git a/src/app/geometry/vgobject.cpp b/src/app/geometry/vgobject.cpp
index f201b8405..f99e322e7 100644
--- a/src/app/geometry/vgobject.cpp
+++ b/src/app/geometry/vgobject.cpp
@@ -33,7 +33,7 @@
  * @brief VGObject default constructor.
  */
 VGObject::VGObject()
-    :_id(0), type(GOType::Unknown), idObject(0), _name(QString()), mode(Draw::Calculation)
+    :_id(NULL_ID), type(GOType::Unknown), idObject(NULL_ID), _name(QString()), mode(Draw::Calculation)
 {}
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -44,7 +44,7 @@ VGObject::VGObject()
  * @param mode mode creation. Used in modeling mode.
  */
 VGObject::VGObject(const GOType &type, const quint32 &idObject, const Draw &mode)
-    :_id(0), type(type), idObject(idObject), _name(QString()), mode(mode)
+    :_id(NULL_ID), type(type), idObject(idObject), _name(QString()), mode(mode)
 {}
 
 //---------------------------------------------------------------------------------------------------------------------
diff --git a/src/app/geometry/vnodedetail.cpp b/src/app/geometry/vnodedetail.cpp
index 77de99a08..ace3d55fa 100644
--- a/src/app/geometry/vnodedetail.cpp
+++ b/src/app/geometry/vnodedetail.cpp
@@ -30,7 +30,7 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VNodeDetail::VNodeDetail()
-    :id(0), typeTool(Tool::NodePoint), typeNode(NodeDetail::Contour), mx(0), my(0)
+    :id(NULL_ID), typeTool(Tool::NodePoint), typeNode(NodeDetail::Contour), mx(0), my(0)
 {}
 
 //---------------------------------------------------------------------------------------------------------------------
diff --git a/src/app/mainwindow.cpp b/src/app/mainwindow.cpp
index 39e26b2d2..4ee42633a 100644
--- a/src/app/mainwindow.cpp
+++ b/src/app/mainwindow.cpp
@@ -62,7 +62,7 @@
 MainWindow::MainWindow(QWidget *parent)
     :QMainWindow(parent), ui(new Ui::MainWindow), pattern(nullptr), doc(nullptr), tool(Tool::ArrowTool),
       currentScene(nullptr), sceneDraw(nullptr), sceneDetails(nullptr), mouseCoordinate(nullptr), helpLabel(nullptr),
-      isInitialized(false), dialogTable(0), dialogTool(nullptr), dialogHistory(nullptr),
+      isInitialized(false), dialogTable(nullptr), dialogTool(nullptr), dialogHistory(nullptr),
       comboBoxDraws(nullptr), curFile(QString()), mode(Draw::Calculation), currentDrawIndex(0),
       currentToolBoxIndex(0), drawMode(true), recentFileActs{nullptr, nullptr, nullptr, nullptr, nullptr},
       separatorAct(nullptr), autoSaveTimer(nullptr), guiEnabled(true), gradationHeights(nullptr),
diff --git a/src/app/options.h b/src/app/options.h
index a7239aebf..acdad9153 100644
--- a/src/app/options.h
+++ b/src/app/options.h
@@ -39,6 +39,7 @@ class QString;
 
 #define SceneSize 50000
 #define DefPointRadius 2.0//mm
+#define NULL_ID 0//use this value for initialization variables that keeps id values. 0 mean uknown id value.
 
 enum class SceneObject : char { Point, Line, Spline, Arc, SplinePath, Detail };
 enum class Tool : char
diff --git a/src/app/tools/drawTools/vtoolbisector.cpp b/src/app/tools/drawTools/vtoolbisector.cpp
index 00e146457..df5a0cfbb 100644
--- a/src/app/tools/drawTools/vtoolbisector.cpp
+++ b/src/app/tools/drawTools/vtoolbisector.cpp
@@ -50,7 +50,8 @@ const QString VToolBisector::ToolType = QStringLiteral("bisector");
 VToolBisector::VToolBisector(VPattern *doc, VContainer *data, const quint32 &id, const QString &typeLine,
                              const QString &formula, const quint32 &firstPointId, const quint32 &secondPointId,
                              const quint32 &thirdPointId, const Source &typeCreation, QGraphicsItem *parent)
-    :VToolLinePoint(doc, data, id, typeLine, formula, secondPointId, 0, parent), firstPointId(0), thirdPointId(0)
+    :VToolLinePoint(doc, data, id, typeLine, formula, secondPointId, 0, parent), firstPointId(NULL_ID),
+      thirdPointId(NULL_ID)
 {
     this->firstPointId = firstPointId;
     this->thirdPointId = thirdPointId;
diff --git a/src/app/tools/drawTools/vtoolpoint.cpp b/src/app/tools/drawTools/vtoolpoint.cpp
index 2b0032aac..f4b7226c4 100644
--- a/src/app/tools/drawTools/vtoolpoint.cpp
+++ b/src/app/tools/drawTools/vtoolpoint.cpp
@@ -42,7 +42,8 @@ const QString VToolPoint::TagName = QStringLiteral("point");
  * @param parent parent object.
  */
 VToolPoint::VToolPoint(VPattern *doc, VContainer *data, quint32 id, QGraphicsItem *parent)
-    :VDrawTool(doc, data, id), QGraphicsEllipseItem(parent), radius(DefPointRadius), namePoint(0), lineName(0)
+    :VDrawTool(doc, data, id), QGraphicsEllipseItem(parent), radius(DefPointRadius), namePoint(nullptr),
+      lineName(nullptr)
 {
     radius = qApp->toPixel(DefPointRadius/*mm*/, Unit::Mm);
     namePoint = new VGraphicsSimpleTextItem(this);
diff --git a/src/app/undocommands/vundocommand.cpp b/src/app/undocommands/vundocommand.cpp
index ef15ed022..a022f4f63 100644
--- a/src/app/undocommands/vundocommand.cpp
+++ b/src/app/undocommands/vundocommand.cpp
@@ -31,7 +31,7 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VUndoCommand::VUndoCommand(const QDomElement &xml, VPattern *doc, QUndoCommand *parent)
-    :QObject(), QUndoCommand(parent), xml(xml), doc(doc), nodeId(0), redoFlag(false)
+    :QObject(), QUndoCommand(parent), xml(xml), doc(doc), nodeId(NULL_ID), redoFlag(false)
 {
     SCASSERT(doc != nullptr);
 }
diff --git a/src/app/visualization/vistoolalongline.cpp b/src/app/visualization/vistoolalongline.cpp
index a20b33dda..004b7f489 100644
--- a/src/app/visualization/vistoolalongline.cpp
+++ b/src/app/visualization/vistoolalongline.cpp
@@ -32,7 +32,8 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VisToolAlongLine::VisToolAlongLine(const VContainer *data, QGraphicsItem *parent)
-    : VisLine(data, parent), point2Id(0), point(nullptr), lineP1(nullptr), lineP2(nullptr), line(nullptr), length(0)
+    : VisLine(data, parent), point2Id(NULL_ID), point(nullptr), lineP1(nullptr), lineP2(nullptr), line(nullptr),
+      length(0)
 {
     this->mainColor = Qt::red;
     this->setZValue(2);// Show on top real tool
diff --git a/src/app/visualization/vistoolbisector.cpp b/src/app/visualization/vistoolbisector.cpp
index 4da80d9fd..0ff245193 100644
--- a/src/app/visualization/vistoolbisector.cpp
+++ b/src/app/visualization/vistoolbisector.cpp
@@ -33,7 +33,7 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VisToolBisector::VisToolBisector(const VContainer *data, QGraphicsItem *parent)
-    :VisLine(data, parent), point2Id(0), point3Id(0), point(nullptr), line1P1(nullptr), line1P2(nullptr),
+    :VisLine(data, parent), point2Id(NULL_ID), point3Id(NULL_ID), point(nullptr), line1P1(nullptr), line1P2(nullptr),
       line1(nullptr), line2P2(nullptr), line2(nullptr), length(0)
 {
     line1P1 = InitPoint(supportColor, this);
diff --git a/src/app/visualization/vistoolheight.cpp b/src/app/visualization/vistoolheight.cpp
index 45f548dd5..8bbf9a9ae 100644
--- a/src/app/visualization/vistoolheight.cpp
+++ b/src/app/visualization/vistoolheight.cpp
@@ -32,7 +32,7 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VisToolHeight::VisToolHeight(const VContainer *data, QGraphicsItem *parent)
-    : VisLine(data, parent), lineP1Id(0), lineP2Id(0), point(nullptr), base_point(nullptr), lineP1(nullptr),
+    : VisLine(data, parent), lineP1Id(NULL_ID), lineP2Id(NULL_ID), point(nullptr), base_point(nullptr), lineP1(nullptr),
       lineP2(nullptr), line(nullptr), line_intersection(nullptr)
 {
     base_point = InitPoint(supportColor, this);
diff --git a/src/app/visualization/vistoolline.cpp b/src/app/visualization/vistoolline.cpp
index bcd14b4f5..c6fc56995 100644
--- a/src/app/visualization/vistoolline.cpp
+++ b/src/app/visualization/vistoolline.cpp
@@ -33,7 +33,7 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VisToolLine::VisToolLine(const VContainer *data, QGraphicsItem *parent)
-    :VisLine(data, parent), point2Id(0)
+    :VisLine(data, parent), point2Id(NULL_ID)
 {
     this->mainColor = Qt::red;
 }
diff --git a/src/app/visualization/vistoollineintersect.cpp b/src/app/visualization/vistoollineintersect.cpp
index e2aa1fee3..c3ab55d65 100644
--- a/src/app/visualization/vistoollineintersect.cpp
+++ b/src/app/visualization/vistoollineintersect.cpp
@@ -32,8 +32,8 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VisToolLineIntersect::VisToolLineIntersect(const VContainer *data, QGraphicsItem *parent)
-    :VisLine(data, parent), line1P2Id(0), line2P1Id(0), line2P2Id(0), point(nullptr), line1P1(nullptr),
-      line1P2(nullptr), line1(nullptr), line2P1(nullptr), line2P2(nullptr)
+    :VisLine(data, parent), line1P2Id(NULL_ID), line2P1Id(NULL_ID), line2P2Id(NULL_ID), point(nullptr),
+      line1P1(nullptr), line1P2(nullptr), line1(nullptr), line2P1(nullptr), line2P2(nullptr)
 {
     line1P1 = InitPoint(supportColor, this);
     line1P2 = InitPoint(supportColor, this);
diff --git a/src/app/visualization/vistoolnormal.cpp b/src/app/visualization/vistoolnormal.cpp
index 3883c38b8..af11fe951 100644
--- a/src/app/visualization/vistoolnormal.cpp
+++ b/src/app/visualization/vistoolnormal.cpp
@@ -32,8 +32,8 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VisToolNormal::VisToolNormal(const VContainer *data, QGraphicsItem *parent)
-    : VisLine(data, parent), point2Id(0), point(nullptr), lineP1(nullptr), lineP2(nullptr), line(nullptr), length(0),
-      angle(0)
+    : VisLine(data, parent), point2Id(NULL_ID), point(nullptr), lineP1(nullptr), lineP2(nullptr), line(nullptr),
+      length(0), angle(0)
 {
     this->mainColor = Qt::red;
 
diff --git a/src/app/visualization/vistoolpointofcontact.cpp b/src/app/visualization/vistoolpointofcontact.cpp
index c509efdb2..1af058f3a 100644
--- a/src/app/visualization/vistoolpointofcontact.cpp
+++ b/src/app/visualization/vistoolpointofcontact.cpp
@@ -32,7 +32,7 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VisToolPointOfContact::VisToolPointOfContact(const VContainer *data, QGraphicsItem *parent)
-    :VisLine(data, parent), lineP2Id(0), radiusId(0), point(nullptr), lineP1(nullptr), lineP2(nullptr),
+    :VisLine(data, parent), lineP2Id(NULL_ID), radiusId(NULL_ID), point(nullptr), lineP1(nullptr), lineP2(nullptr),
       arc_point(nullptr), circle(nullptr), radius(0)
 {
     arc_point = InitPoint(supportColor, this);
diff --git a/src/app/visualization/vistoolpointofintersection.cpp b/src/app/visualization/vistoolpointofintersection.cpp
index 1475fcd81..f6f98136a 100644
--- a/src/app/visualization/vistoolpointofintersection.cpp
+++ b/src/app/visualization/vistoolpointofintersection.cpp
@@ -32,7 +32,7 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VisToolPointOfIntersection::VisToolPointOfIntersection(const VContainer *data, QGraphicsItem *parent)
-    : VisLine(data, parent), point2Id(0), point(nullptr), axisP1(nullptr), axisP2(nullptr), axis2(nullptr)
+    : VisLine(data, parent), point2Id(NULL_ID), point(nullptr), axisP1(nullptr), axisP2(nullptr), axis2(nullptr)
 {
     axisP1 = InitPoint(supportColor, this);
     axisP2 = InitPoint(supportColor, this);
diff --git a/src/app/visualization/vistoolshoulderpoint.cpp b/src/app/visualization/vistoolshoulderpoint.cpp
index 2142ebe0e..aefca4667 100644
--- a/src/app/visualization/vistoolshoulderpoint.cpp
+++ b/src/app/visualization/vistoolshoulderpoint.cpp
@@ -32,7 +32,7 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VisToolShoulderPoint::VisToolShoulderPoint(const VContainer *data, QGraphicsItem *parent)
-    :VisLine(data, parent), lineP1Id(0), lineP2Id(0), point(nullptr), line1P1(nullptr), line1P2(nullptr),
+    :VisLine(data, parent), lineP1Id(NULL_ID), lineP2Id(NULL_ID), point(nullptr), line1P1(nullptr), line1P2(nullptr),
       line1(nullptr), line2P2(nullptr), line2(nullptr), line3(nullptr), length(0)
 {
     line1P1 = InitPoint(supportColor, this);
diff --git a/src/app/visualization/vistooltriangle.cpp b/src/app/visualization/vistooltriangle.cpp
index ef9ea6a30..ba1966100 100644
--- a/src/app/visualization/vistooltriangle.cpp
+++ b/src/app/visualization/vistooltriangle.cpp
@@ -34,8 +34,9 @@
 
 //---------------------------------------------------------------------------------------------------------------------
 VisToolTriangle::VisToolTriangle(const VContainer *data, QGraphicsItem *parent)
-    :VisLine(data, parent), point2Id(0), hypotenuseP1Id(0), hypotenuseP2Id(0), point(nullptr), axisP1(nullptr),
-      axisP2(nullptr), axis(nullptr), hypotenuseP1(nullptr), hypotenuseP2(nullptr), foot1(nullptr), foot2(nullptr)
+    :VisLine(data, parent), point2Id(NULL_ID), hypotenuseP1Id(NULL_ID), hypotenuseP2Id(NULL_ID), point(nullptr),
+      axisP1(nullptr), axisP2(nullptr), axis(nullptr), hypotenuseP1(nullptr), hypotenuseP2(nullptr), foot1(nullptr),
+      foot2(nullptr)
 {
     axisP1 = InitPoint(supportColor, this);
     axisP2 = InitPoint(supportColor, this);
diff --git a/src/app/visualization/visualization.cpp b/src/app/visualization/visualization.cpp
index ae079d60e..e548df081 100644
--- a/src/app/visualization/visualization.cpp
+++ b/src/app/visualization/visualization.cpp
@@ -35,7 +35,7 @@
 //---------------------------------------------------------------------------------------------------------------------
 Visualization::Visualization(const VContainer *data)
     :QObject(), data(data), factor(VDrawTool::factor), scenePos(QPointF()),
-      mainColor(Qt::red), supportColor(Qt::magenta), lineStyle(Qt::SolidLine), point1Id(0), toolTip(QString())
+      mainColor(Qt::red), supportColor(Qt::magenta), lineStyle(Qt::SolidLine), point1Id(NULL_ID), toolTip(QString())
 {}
 
 //---------------------------------------------------------------------------------------------------------------------
diff --git a/src/app/xml/vtoolrecord.cpp b/src/app/xml/vtoolrecord.cpp
index 030d33588..1b6fcbd19 100644
--- a/src/app/xml/vtoolrecord.cpp
+++ b/src/app/xml/vtoolrecord.cpp
@@ -33,7 +33,7 @@
  * @brief VToolRecord default constructor.
  */
 VToolRecord::VToolRecord()
-    :id(0), typeTool(Tool::ArrowTool), nameDraw(QString())
+    :id(NULL_ID), typeTool(Tool::ArrowTool), nameDraw(QString())
 {}
 
 //---------------------------------------------------------------------------------------------------------------------