[TechDraw] Add ability to align points by rotating view

Fixes #7061

src/Mod/TechDraw/Gui/QGIVertex.cpp

@@ -1,5 +1,6 @@
 /***************************************************************************
  *   Copyright (c) 2013 Luke Parry <l.parry@warwick.ac.uk>                 *
+ *   Copyright (c) 2024 Benjamin Bræstrup Sayoc <benj5378@outlook.com>     *
  *                                                                         *
  *   This file is part of the FreeCAD CAx development system.              *
  *                                                                         *
@@ -29,6 +30,8 @@
 # include <QStyleOptionGraphicsItem>
 #endif
 
+#include <Base/Tools2D.h>
+
 #include "QGIVertex.h"
 #include "PreferencesGui.h"
 #include "QGIPrimPath.h"
@@ -67,3 +70,16 @@ void QGIVertex::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
 //    setBrush(m_brush);
     QGIPrimPath::paint (painter, &myOption, widget);
 }
+
+Base::Vector2d QGIVertex::toVector2d() const
+{
+    QPointF center = boundingRect().center();
+    center = mapToScene(center);
+    return Base::Vector2d(center.x(), center.y());
+}
+
+//! Returns a vector drawn from own position to p2
+Base::Vector2d QGIVertex::vector2dBetweenPoints(const QGIVertex* p2) const
+{
+    return p2->toVector2d() - toVector2d();
+}