sethLabels/glabels/LabelModelLineObject.cpp

/*  LabelModelLineObject.cpp
 *
 *  Copyright (C) 2013-2016  Jim 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 "LabelModelLineObject.h"


#include <QBrush>
#include <QPen>


namespace glabels
{

	//
	// Private
	//
	namespace
	{
		const double slopPixels = 2;
	}


	///
	/// Constructor
	///
	LabelModelLineObject::LabelModelLineObject()
	{
		mOutline = 0;

		mHandles << new HandleP1( this );
		mHandles << new HandleP2( this );

		mLineWidth       = 1.0;
		mLineColorNode   = ColorNode( QColor( 0, 0, 0 ) );
	}


	///
	/// Copy constructor
	///
	LabelModelLineObject::LabelModelLineObject( const LabelModelLineObject* object )
		: LabelModelObject(object)
	{
		mLineWidth       = object->mLineWidth;
		mLineColorNode   = object->mLineColorNode;
	}


	///
	/// Destructor
	///
	LabelModelLineObject::~LabelModelLineObject()
	{
		foreach( Handle* handle, mHandles )
		{
			delete handle;
		}
		mHandles.clear();
	}


	///
	/// Clone
	///
	LabelModelLineObject* LabelModelLineObject::clone() const
	{
		return new LabelModelLineObject( this );
	}


	///
	/// Line Width Property Getter
	///
	Distance LabelModelLineObject::lineWidth( void ) const
	{
		return mLineWidth;
	}


	///
	/// Line Width Property Setter
	///
	void LabelModelLineObject::setLineWidth( const Distance& value )
	{
		if ( mLineWidth != value )
		{
			mLineWidth = value;
			emit changed();
		}
	}


	///
	/// Line Color Node Property Getter
	///
	ColorNode LabelModelLineObject::lineColorNode( void ) const
	{
		return mLineColorNode;
	}


	///
	/// Line Color Node Property Setter
	///
	void LabelModelLineObject::setLineColorNode( const ColorNode& value )
	{
		if ( mLineColorNode != value )
		{
			mLineColorNode = value;
			emit changed();
		}
	}
		

	///
	/// Can Line Color Capability Implementation
	///
	bool LabelModelLineObject::canLineColor()
	{
		return true;
	}


	///
	/// Can Line Width Capability Implementation
	///
	bool LabelModelLineObject::canLineWidth()
	{
		return true;
	}


	///
	/// Draw shadow of object
	///
	void LabelModelLineObject::drawShadow( QPainter* painter, bool inEditor, merge::Record* record ) const
	{
		QColor lineColor = mLineColorNode.color( record );
		QColor shadowColor = mShadowColorNode.color( record );

		shadowColor.setAlphaF( mShadowOpacity );

		if ( lineColor.alpha() )
		{
			painter->setPen( QPen( shadowColor, mLineWidth.pt() ) );
			painter->drawLine( 0, 0, mW.pt(), mH.pt() );
		}
	}

	
	///
	/// Draw object itself
	///
	void LabelModelLineObject::drawObject( QPainter* painter, bool inEditor, merge::Record* record ) const
	{
		QColor lineColor = mLineColorNode.color( record );

		painter->setPen( QPen( lineColor, mLineWidth.pt() ) );
		painter->drawLine( 0, 0, mW.pt(), mH.pt() );
	}


	///
	/// Path to test for hover condition
	///
	QPainterPath LabelModelLineObject::hoverPath( double scale ) const
	{
		QPainterPath path;

		if ( mLineColorNode.color().alpha() )
		{
			//
			// Build a thin rectangle representing line
			//
			double rPts = mLineWidth.pt()/2 + slopPixels / scale;

			double lengthPts = sqrt( mW.pt()*mW.pt() + mH.pt()*mH.pt() );
			double dx = mH.pt() / lengthPts; // horizontal pitch of perpendicular line
			double dy = mW.pt() / lengthPts; // vertical pitch of perpendicular line
	
			path.moveTo(           rPts*dx,         - rPts*dy );
			path.lineTo( mW.pt() + rPts*dx, mH.pt() - rPts*dy );
			path.lineTo( mW.pt() - rPts*dx, mH.pt() + rPts*dy );
			path.lineTo(         - rPts*dx,           rPts*dy );
		
			path.closeSubpath();
		}

		return path;
	}

}