Pointer cleanup (#242)

- Made greater use of smart pointers, eliminating many instances of manual memory management
- Do not use pointers at all for many non-polymorphic classes
- Assorted other code cleanup

model/Handle.cpp

@@ -0,0 +1,225 @@
+/*  Handles.cpp
+ *
+ *  Copyright (C) 2013  Jaye Evins <evins@snaught.com>
+ *
+ *  This file is part of gLabels-qt.
+ *
+ *  gLabels-qt is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  gLabels-qt 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with gLabels-qt.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "Handle.h"
+
+#include "ModelObject.h"
+
+#include <QColor>
+#include <QDebug>
+
+
+namespace glabels
+{
+
+	namespace model
+	{
+
+		//
+		// Private
+		//
+		namespace
+		{
+			const double handlePixels             = 7;
+			const double handleOutlineWidthPixels = 1;
+
+			const QColor handleFillColor( 0,  192,  0,  96 );
+			const QColor originHandleFillColor( 192,  0,  0,  96 );
+			const QColor handleOutlineColor( 0,  0,   0,  192 );
+		}
+
+
+		///
+		/// Handle Constructor
+		///
+		Handle::Handle( ModelObject* owner, Location location )
+			: mOwner(owner), mLocation(location)
+		{
+			// empty
+		}
+
+
+		///
+		/// Is Handle null?
+		///
+		bool Handle::isNull() const
+		{
+			return mLocation == NULL_HANDLE;
+		}
+
+
+		///
+		/// Handle owner
+		///
+		ModelObject* Handle::owner() const
+		{
+			return mOwner;
+		}
+
+
+		///
+		/// Handle location
+		///
+		Handle::Location Handle::location() const
+		{
+			return mLocation;
+		}
+
+
+		///
+		/// Draw Handle
+		///
+		void Handle::draw( QPainter* painter, double scale ) const
+		{
+			switch ( mLocation )
+			{
+			case NW:
+				drawAt( painter, scale, 0, 0, originHandleFillColor );
+				break;
+			case N:
+				drawAt( painter, scale, mOwner->w()/2, 0, handleFillColor );
+				break;
+			case NE:
+				drawAt( painter, scale, mOwner->w(), 0, handleFillColor );
+				break;
+			case E:
+				drawAt( painter, scale, mOwner->w(), mOwner->h()/2, handleFillColor );
+				break;
+			case SE:
+				drawAt( painter, scale, mOwner->w(), mOwner->h(), handleFillColor );
+				break;
+			case S:
+				drawAt( painter, scale, mOwner->w()/2, mOwner->h(), handleFillColor );
+				break;
+			case SW:
+				drawAt( painter, scale, 0, mOwner->h(), handleFillColor );
+				break;
+			case W:
+				drawAt( painter, scale, 0, mOwner->h()/2, handleFillColor );
+				break;
+			case P1:
+				drawAt( painter, scale, 0, 0, originHandleFillColor );
+				break;
+			case P2:
+				drawAt( painter, scale, mOwner->w(), mOwner->h(), handleFillColor );
+				break;
+			default:
+				qWarning() << "Unknown Handle location";
+				break;
+			}
+		}
+
+
+		///
+		/// Handle Path
+		///
+		QPainterPath Handle::path( double scale ) const
+		{
+			switch ( mLocation )
+			{
+			case NW:
+				return pathAt( scale, 0, 0 );
+				break;
+			case N:
+				return pathAt( scale, mOwner->w()/2, 0 );
+				break;
+			case NE:
+				return pathAt( scale, mOwner->w(), 0 );
+				break;
+			case E:
+				return pathAt( scale, mOwner->w(), mOwner->h()/2 );
+				break;
+			case SE:
+				return pathAt( scale, mOwner->w(), mOwner->h() );
+				break;
+			case S:
+				return pathAt( scale, mOwner->w()/2, mOwner->h() );
+				break;
+			case SW:
+				return pathAt( scale, 0, mOwner->h() );
+				break;
+			case W:
+				return pathAt( scale, 0, mOwner->h()/2 );
+				break;
+			case P1:
+				return pathAt( scale, 0, 0 );
+				break;
+			case P2:
+				return pathAt( scale, mOwner->w(), mOwner->h() );
+				break;
+			default:
+				qWarning() << "Unknown Handle location";
+				return QPainterPath(); // Empty
+				break;
+			}
+		}
+
+
+		///
+		/// Draw Handle at x,y
+		///
+		void Handle::drawAt( QPainter* painter,
+		                     double    scale,
+		                     Distance  x,
+		                     Distance  y,
+		                     QColor    color ) const
+		{
+			painter->save();
+
+			painter->translate( x.pt(), y.pt() );
+
+			double s = 1.0 / scale;
+
+			QPen pen( handleOutlineColor );
+			pen.setCosmetic( true );
+			pen.setWidth( handleOutlineWidthPixels );
+
+			painter->setPen( pen );
+			painter->setBrush( color );
+
+			painter->drawRect( QRectF( -s*handlePixels/2.0, -s*handlePixels/2.0,
+			                           s*handlePixels, s*handlePixels ) );
+
+			painter->restore();
+		}
+
+
+		///
+		/// Create Handle path at x,y
+		///
+		QPainterPath Handle::pathAt( double   scale,
+		                             Distance x,
+		                             Distance y ) const
+		{
+			QPainterPath path;
+
+			double s = 1/scale;
+
+			path.addRect( -s*handlePixels/2, -s*handlePixels/2, s*handlePixels, s*handlePixels );
+			path.translate( x.pt(), y.pt() );
+	
+			return path;
+		}
+
+
+	}
+
+}