Add View centerlines

src/Mod/TechDraw/App/DrawViewPart.cpp

@@ -110,6 +110,8 @@ DrawViewPart::DrawViewPart(void) : geometryObject(0)
     ADD_PROPERTY_TYPE(HiddenWidth,(0.15),fgroup,App::Prop_None,"The thickness of hidden lines, if enabled");
     ADD_PROPERTY_TYPE(ShowCenters ,(true),fgroup,App::Prop_None,"Center marks on/off");
     ADD_PROPERTY_TYPE(CenterScale,(2.0),fgroup,App::Prop_None,"Center mark size adjustment, if enabled");
+    ADD_PROPERTY_TYPE(HorizCenterLine ,(false),fgroup,App::Prop_None,"Show a horizontal centerline through view");
+    ADD_PROPERTY_TYPE(VertCenterLine ,(false),fgroup,App::Prop_None,"Show a vertical centerline through view");
 
     ADD_PROPERTY_TYPE(ShowSectionLine ,(true)    ,lgroup,App::Prop_None,"Show/hide section line if applicable");
     ADD_PROPERTY_TYPE(HorizSectionLine ,(true)    ,lgroup,App::Prop_None,"Section line is horizontal");
@@ -218,7 +220,9 @@ void DrawViewPart::onChanged(const App::Property* prop)
             prop == &ShowSectionLine ||
             prop == &HorizSectionLine  ||
             prop == &ArrowUpSection  ||
-            prop == &SymbolSection  ) {
+            prop == &SymbolSection   ||
+            prop == &HorizCenterLine ||
+            prop == &VertCenterLine) {
             try {
                 App::DocumentObjectExecReturn *ret = recompute();
                 delete ret;

src/Mod/TechDraw/App/DrawViewPart.h

@@ -74,6 +74,8 @@ public:
     App::PropertyBool   ShowCenters;
     App::PropertyFloat  CenterScale;
     App::PropertyFloatConstraint  Tolerance;
+    App::PropertyBool   HorizCenterLine;
+    App::PropertyBool   VertCenterLine;
 
     App::PropertyBool   ShowSectionLine;
     App::PropertyBool   HorizSectionLine;     //true(horiz)/false(vert)

src/Mod/TechDraw/Gui/CMakeLists.txt

@@ -143,6 +143,8 @@ SET(TechDrawGuiView_SRCS
     QGISectionLine.h
     QGIDecoration.cpp
     QGIDecoration.h
+    QGICenterLine.cpp
+    QGICenterLine.h
     TemplateTextField.cpp
     TemplateTextField.h
     ZVALUE.h

src/Mod/TechDraw/Gui/QGICenterLine.cpp

@@ -0,0 +1,99 @@
+/***************************************************************************
+ *   Copyright (c) 2016 WandererFan <wandererfan@gmail.com>                *
+ *                                                                         *
+ *   This file is part of the FreeCAD CAx development system.              *
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or         *
+ *   modify it under the terms of the GNU Library General Public           *
+ *   License as published by the Free Software Foundation; either          *
+ *   version 2 of the License, or (at your option) any later version.      *
+ *                                                                         *
+ *   This library  is distributed in the hope that it will be useful,      *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU Library General Public License for more details.                  *
+ *                                                                         *
+ *   You should have received a copy of the GNU Library General Public     *
+ *   License along with this library; see the file COPYING.LIB. If not,    *
+ *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
+ *   Suite 330, Boston, MA  02111-1307, USA                                *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "PreCompiled.h"
+#ifndef _PreComp_
+#include <QPainter>
+#include <QStyleOptionGraphicsItem>
+#endif
+
+#include <App/Application.h>
+#include <App/Material.h>
+#include <Base/Console.h>
+#include <Base/Parameter.h>
+
+#include "QGICenterLine.h"
+
+using namespace TechDrawGui;
+
+QGICenterLine::QGICenterLine()
+{
+    m_line = new QGraphicsPathItem();
+    addToGroup(m_line);
+    setWidth(0.0);
+    setStyle(getCenterStyle());
+    setColor(getCenterColor());
+}
+
+void QGICenterLine::draw()
+{
+    prepareGeometryChange();
+    makeLine();
+    update();
+}
+
+void QGICenterLine::makeLine()
+{
+    QPainterPath pp;
+    pp.moveTo(m_start);
+    pp.lineTo(m_end);
+    m_line->setPath(pp);
+}
+
+
+void QGICenterLine::setBounds(double x1,double y1,double x2,double y2)
+{
+    m_start = QPointF(x1,y1);
+    m_end = QPointF(x2,y2);
+}
+
+QColor QGICenterLine::getCenterColor()
+{
+    Base::Reference<ParameterGrp> hGrp = App::GetApplication().GetUserParameter()
+        .GetGroup("BaseApp")->GetGroup("Preferences")->GetGroup("Mod/TechDraw/Colors");
+    App::Color fcColor = App::Color((uint32_t) hGrp->GetUnsigned("CenterColor", 0x08080800));
+    return fcColor.asValue<QColor>();
+}
+
+Qt::PenStyle QGICenterLine::getCenterStyle()
+{
+    Base::Reference<ParameterGrp> hGrp = App::GetApplication().GetUserParameter().GetGroup("BaseApp")->
+                                         GetGroup("Preferences")->GetGroup("Mod/TechDraw");
+    Qt::PenStyle centerStyle = static_cast<Qt::PenStyle> (hGrp->GetInt("CenterLine",3));
+    return centerStyle;
+}
+
+void QGICenterLine::paint ( QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget) {
+    QStyleOptionGraphicsItem myOption(*option);
+    myOption.state &= ~QStyle::State_Selected;
+
+    setTools();
+    QGIDecoration::paint (painter, &myOption, widget);
+}
+
+void QGICenterLine::setTools()
+{
+    m_pen.setWidthF(m_width);
+    m_pen.setColor(m_colCurrent);
+    m_pen.setStyle(m_styleCurrent);
+    m_line->setPen(m_pen);
+}

src/Mod/TechDraw/Gui/QGICenterLine.h

@@ -0,0 +1,65 @@
+/***************************************************************************
+ *   Copyright (c) 2016 WandererFan <wandererfan@gmail.com>                *
+ *                                                                         *
+ *   This file is part of the FreeCAD CAx development system.              *
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or         *
+ *   modify it under the terms of the GNU Library General Public           *
+ *   License as published by the Free Software Foundation; either          *
+ *   version 2 of the License, or (at your option) any later version.      *
+ *                                                                         *
+ *   This library  is distributed in the hope that it will be useful,      *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU Library General Public License for more details.                  *
+ *                                                                         *
+ *   You should have received a copy of the GNU Library General Public     *
+ *   License along with this library; see the file COPYING.LIB. If not,    *
+ *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
+ *   Suite 330, Boston, MA  02111-1307, USA                                *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef TECHDRAWGUI_QGICENTERLINE_H
+#define TECHDRAWGUI_QGICENTERLINE_H
+
+#include <QPointF>
+#include <QPainterPath>
+#include <QColor>
+
+#include <Base/Vector3D.h>
+
+#include "QGIDecoration.h"
+
+namespace TechDrawGui
+{
+
+class TechDrawGuiExport QGICenterLine : public QGIDecoration
+{
+public:
+    explicit QGICenterLine();
+    ~QGICenterLine() {}
+
+    enum {Type = QGraphicsItem::UserType + 174};
+    int type() const { return Type;}
+
+    virtual void paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget = 0 );
+
+    void setBounds(double x1,double y1,double x2,double y2);
+    virtual void draw();
+
+protected:
+    QColor getCenterColor();
+    Qt::PenStyle getCenterStyle();
+    void makeLine();
+    void setTools();
+
+private:
+    QGraphicsPathItem* m_line;           //primpath?
+    QPointF            m_start;
+    QPointF            m_end;
+};
+
+}
+
+#endif // TECHDRAWGUI_QGICENTERLINE_H

src/Mod/TechDraw/Gui/QGIUserTypes.h

@@ -33,6 +33,7 @@ QGIPrimPath: 170
 QGICMark: 171
 QGISectionLine: 172
 QGIDecoration: 173
+QGICenterLine: 174
 */
 
 /*

src/Mod/TechDraw/Gui/QGIViewPart.cpp

@@ -59,6 +59,7 @@
 #include "QGIVertex.h"
 #include "QGICMark.h"
 #include "QGISectionLine.h"
+#include "QGICenterLine.h"
 #include "QGCustomBorder.h"
 #include "QGCustomLabel.h"
 #include "QGIViewPart.h"
@@ -381,6 +382,8 @@ void QGIViewPart::drawViewPart()
         viewPart->getSectionRef() ) {
         drawSectionLine(true);
     }
+    //draw center lines
+    drawCenterLines(true);
 }
 
 QGIFace* QGIViewPart::drawFace(TechDrawGeometry::Face* f, int idx)
@@ -505,6 +508,50 @@ void QGIViewPart::drawSectionLine(bool b)
     }
 }
 
+void QGIViewPart::drawCenterLines(bool b)
+{
+    TechDraw::DrawViewPart *viewPart = dynamic_cast<TechDraw::DrawViewPart *>(getViewObject());
+    if (!viewPart)  {
+        return;
+
+    }
+    if (b) {
+        //Base::Vector3d vertDir(0,1,0);
+        //Base::Vector3d horizDir(1,0,0);
+        bool horiz = viewPart->HorizCenterLine.getValue();
+        bool vert = viewPart->VertCenterLine.getValue();
+
+        //centroid of part is at (0,0)
+        QGICenterLine* centerLine;
+        double sectionSpan;
+        double sectionFudge = 10.0;
+        double xVal, yVal;
+        if (horiz)  {
+            centerLine = new QGICenterLine();
+            addToGroup(centerLine);
+            centerLine->setPos(0.0,0.0);
+            sectionSpan = m_border->rect().width() + sectionFudge;
+            xVal = sectionSpan / 2.0;
+            yVal = 0.0;
+            centerLine->setBounds(-xVal,-yVal,xVal,yVal);
+            //centerLine->setWidth(viewPart->LineWidth.getValue());
+            centerLine->setZValue(ZVALUE::SECTIONLINE);
+            centerLine->draw();
+        }
+        if (vert) {
+            centerLine = new QGICenterLine();
+            addToGroup(centerLine);
+            centerLine->setPos(0.0,0.0);
+            sectionSpan = (m_border->rect().height() - m_label->boundingRect().height()) + sectionFudge;
+            xVal = 0.0;
+            yVal = sectionSpan / 2.0;
+            centerLine->setBounds(-xVal,-yVal,xVal,yVal);
+            //centerLine->setWidth(viewPart->LineWidth.getValue());
+            centerLine->setZValue(ZVALUE::SECTIONLINE);
+            centerLine->draw();
+        }
+    }
+}
 
 // As called by arc of ellipse case:
 // pathArc(path, geom->major, geom->minor, geom->angle, geom->largeArc, geom->cw,

src/Mod/TechDraw/Gui/QGIViewPart.h

@@ -58,6 +58,7 @@ public:
     void tidy();
     virtual QRectF boundingRect() const override;
     virtual void drawSectionLine(bool b);
+    virtual void drawCenterLines(bool b);
     bool showSection;
 
     virtual void draw() override;