Improve visualization for tool Segment an arc.

src/libs/vtools/dialogs/tools/dialogcutarc.cpp

@@ -47,6 +47,7 @@
 #include "ui_dialogcutarc.h"
 #include "../vgeometry/varc.h"
 #include "../qmuparser/qmudef.h"
+#include "../vwidgets/vabstractmainwindow.h"
 
 //---------------------------------------------------------------------------------------------------------------------
 /**
@@ -172,8 +173,10 @@ void DialogCutArc::ChosenObject(quint32 id, const SceneObject &type)
                 vis->VisualMode(id);
             }
             prepare = true;
-            this->setModal(true);
-            this->show();
+
+            auto *window = qobject_cast<VAbstractMainWindow *>(VAbstractValApplication::VApp()->getMainWindow());
+            SCASSERT(window != nullptr)
+            connect(vis, &Visualization::ToolTip, window, &VAbstractMainWindow::ShowToolTip);
         }
     }
 }
@@ -354,3 +357,49 @@ auto DialogCutArc::GetAliasSuffix2() const -> QString
 {
     return ui->lineEditAlias2->text();
 }
+
+//---------------------------------------------------------------------------------------------------------------------
+void DialogCutArc::ShowDialog(bool click)
+{
+    if (not prepare)
+    {
+        return;
+    }
+
+    auto FinishCreating = [this]()
+    {
+        vis->SetMode(Mode::Show);
+        vis->RefreshGeometry();
+
+        emit ToolTip(QString());
+
+        setModal(true);
+        show();
+    };
+
+    if (click)
+    {
+        // The check need to ignore first release of mouse button.
+        // User can select point by clicking on a label.
+        if (not m_firstRelease)
+        {
+            m_firstRelease = true;
+            return;
+        }
+
+        auto *scene = qobject_cast<VMainGraphicsScene *>(VAbstractValApplication::VApp()->getCurrentScene());
+        SCASSERT(scene != nullptr)
+
+        const QSharedPointer<VArc> arc = data->GeometricObject<VArc>(getArcId());
+        QPointF p = arc->ClosestPoint(scene->getScenePos());
+        qreal len = arc->GetLengthByPoint(p);
+        if (len > 0)
+        {
+            SetFormula(QString::number(FromPixel(len, *data->GetPatternUnit())));
+        }
+
+        FinishCreating();
+    }
+
+    FinishCreating();
+}

src/libs/vtools/dialogs/tools/dialogcutarc.h

@@ -72,6 +72,7 @@ public:
     void SetAliasSuffix2(const QString &alias);
     auto GetAliasSuffix2() const -> QString;
 
+    void ShowDialog(bool click) override;
 public slots:
     void ChosenObject(quint32 id, const SceneObject &type) override;
     /**
@@ -113,6 +114,8 @@ private:
 
     QString m_originAliasSuffix1{};
     QString m_originAliasSuffix2{};
+
+    bool m_firstRelease{false};
 };
 
 //---------------------------------------------------------------------------------------------------------------------

src/libs/vtools/visualization/path/vistoolcutarc.cpp

@@ -42,6 +42,7 @@
 #include "../visualization.h"
 #include "vispath.h"
 #include "../vwidgets/scalesceneitems.h"
+#include "../vmisc/vmodifierkey.h"
 
 //---------------------------------------------------------------------------------------------------------------------
 VisToolCutArc::VisToolCutArc(const VContainer *data, QGraphicsItem *parent)
@@ -75,6 +76,19 @@ void VisToolCutArc::RefreshGeometry()
             DrawPath(m_arc1, ar1.GetPath(), ar1.DirectionArrows(), Qt::darkGreen, lineStyle, Qt::RoundCap);
             DrawPath(m_arc2, ar2.GetPath(), ar2.DirectionArrows(), Qt::darkRed, lineStyle, Qt::RoundCap);
         }
+        else if (mode == Mode::Creation)
+        {
+            QPointF p = arc->ClosestPoint(Visualization::scenePos);
+            qreal length = arc->GetLengthByPoint(p);
+
+            DrawPoint(m_point, p, mainColor);
+
+            const QString prefix = UnitsToStr(VAbstractValApplication::VApp()->patternUnits(), true);
+            Visualization::toolTip = tr("Length = %1%2; "
+                                        "<b>Mouse click</b> - finish selecting the length, "
+                                        "<b>%3</b> - skip")
+                                         .arg(NumberToUser(length), prefix, VModifierKey::EnterKey());
+        }
     }
 }