CFlowchartEditor - linking things in CDiagramEditor

/* ==========================================================================
	CFlowchartEntityIO

	Author :		Johan Rosengren, Abstrakt Mekanik AB

	Date :			2004-04-29

	Purpose :		CFlowchartEntityIO, derived from CFlowchartEntity, 
					represents a linkable I/O-box (a parallellogram). The 
					box can link from all four sides.	

	Description :	The class implements the necessary functions for 
					cloning and creation from text (Clone and 
					CreateFromString). It draws a rectangle using the 
					title attribute of CDiagramEntity as the text 
					contents. 

					Hit-testing is made with a region due to the non-
					rectangular shape of the object.

	Usage :			Create with CFlowchartControlFactory::CreateFromString

   ========================================================================*/

#include "stdafx.h"
#include "FlowchartEntityIO.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

CFlowchartEntityIO::CFlowchartEntityIO()
/* ============================================================
	Function :		CFlowchartEntityIO::CFlowchartEntityIO
	Description :	constructor
					
	Return :		void
	Parameters :	none

	Usage :			

   ============================================================*/
{

	SetConstraints( CSize( 128, 64 ), CSize( 128, 64 ) );
	SetType( _T( "flowchart_IO" ) );

	CString title;
	title.LoadString( IDS_FLOWCHART_IO );
	SetTitle( title );

}

CFlowchartEntityIO::~CFlowchartEntityIO()
/* ============================================================
	Function :		CFlowchartEntityIO::~CFlowchartEntityIO
	Description :	destructor
					
	Return :		void
	Parameters :	none

	Usage :			

   ============================================================*/
{
}

void CFlowchartEntityIO::Draw( CDC* dc, CRect rect )
/* ============================================================
	Function :		CFlowchartEntityIO::Draw
	Description :	Draws the object.

	Return :		void
	Parameters :	CDC* dc		-	The CDC to draw to. 
					CRect rect	-	The real rectangle of the 
									object.

	Usage :			The function should clean up all selected 
					objects. Note that the CDC is a memory CDC, 
					so creating a memory CDC in this function 
					will probably not speed up the function.

   ============================================================*/
{

	dc->SelectStockObject( BLACK_PEN );
	dc->SelectStockObject( WHITE_BRUSH );

	CPoint pt[4];
	int cut = round( ( double ) GetMarkerSize().cx * GetZoom() );

	pt[0].x = rect.left + cut;
	pt[0].y = rect.top;

	pt[1].x = rect.right;
	pt[1].y = rect.top;

	pt[2].x = rect.right - cut;
	pt[2].y = rect.bottom;

	pt[3].x = rect.left;
	pt[3].y = rect.bottom;

	dc->Polygon( pt, 4 );

	CRect r( rect.left + cut, rect.top + cut / 2, rect.right - cut, rect.bottom - cut / 2);
	CFont font;
	font.CreateFont( -round( 12.0 * GetZoom() ), 0,0,0,FW_NORMAL,0,0,0,0,0,0,0,0, _T( "Courier New" ) );
	dc->SelectObject( &font );
	int mode = dc->SetBkMode( TRANSPARENT );
	dc->DrawText( GetTitle(), r, DT_NOPREFIX | DT_WORDBREAK | DT_CENTER );
	dc->SelectStockObject( DEFAULT_GUI_FONT );
	dc->SetBkMode( mode );

}

CDiagramEntity* CFlowchartEntityIO::Clone()
/* ============================================================
	Function :		CFlowchartEntityIO::Clone
	Description :	Clone this object to a new object.
					
	Return :		CDiagramEntity*	-	The new object.
	Parameters :	none

	Usage :			Call to create a clone of the object. The 
					caller will have to delete the object.

   ============================================================*/
{

	CFlowchartEntityIO* obj = new CFlowchartEntityIO;
	obj->Copy( this );
	return obj;

}

CDiagramEntity* CFlowchartEntityIO::CreateFromString( const CString& str )
/* ============================================================
	Function :		CFlowchartEntityIO::CreateFromString
	Description :	Static factory function that creates and 
					returns an instance of this class if str 
					is a valid representation.
					
	Return :		CDiagramEntity*		-	The object, or NULL 
											if str is not a 
											representation of 
											this type.
	Parameters :	const CString& str	-	The string to create 
											from.
					
	Usage :			Can be used as a factory for text file loads. 
					Each object type should have its own 
					version - the default one is a model 
					implementation.

   ============================================================*/
{

	CFlowchartEntityIO* obj = new CFlowchartEntityIO;
	if(!obj->FromString( str ) )
	{
		delete obj;
		obj = NULL;
	}

	return obj;

}