drawbase.cpp

电子白板程序

// DrawBase.cpp: implementation of the CDrawBase class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "DrawBase.h"
#include "DrawView.h"

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

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CDrawBase::CDrawBase( CDrawView & v ) : view( v )
{
	this->draw_id = "";
	
	memset( &this->draw , 0 , sizeof( DRAW ) );

	this->draw.pen.lopnWidth = CPoint( 1 , 1 );

	this->draw_select = false;
}

CDrawBase::~CDrawBase()
{

}

CString CDrawBase::GetId( void )
{
	if( this->draw_id.IsEmpty())

		this->draw_id.Format( "%s:%p" , this->view.username , this );

	return this->draw_id;
}

void CDrawBase::SetId( const char * id )
{
	this->draw_id = id;
}

CDrawBase * CDrawBase::Clone( void )
{
	return NULL;
}

HCURSOR CDrawBase::GetCursor( void )
{
	static HCURSOR hCursor = ::AfxGetApp()->LoadStandardCursor( IDC_ARROW );

	return hCursor;
}

bool CDrawBase::Select( CRect & rc )
{
	this->draw_select = false;

	return false;
}

char * CDrawBase::Encode( int & size , bool erase )
{   //图元id
	CString id = this->GetId( );

	size = id.GetLength() + 1 + sizeof( DRAW );

	char * buffer = new char[ size ];

	ASSERT( buffer );

	strcpy( buffer , id );

	this->draw.version = WB_VERSION;
	
	memcpy( buffer + id.GetLength() + 1 , &this->draw , sizeof( DRAW ) );

	if( erase ) size -= sizeof( DRAW );

	return buffer;
}

bool CDrawBase::Decode( char * buffer , int size )
{	//图元id
	this->draw_id = buffer; size -= this->draw_id.GetLength() + 1;

	if( size >= sizeof( DRAW ) )

		memcpy( &this->draw , buffer + this->draw_id.GetLength() + 1 , sizeof( DRAW ) );

	return this->draw.version == WB_VERSION;
}

void CDrawBase::OnDraw(  CDC * pDC )
{
	if( this->draw_select )
	{
		CPen pen( PS_DOT , 1 , RGB( 0 , 0 , 0 ) );
		
		pDC->SelectObject( &pen );
		
		pDC->SelectStockObject( NULL_BRUSH );
		
		CRect rc( this->draw.start , this->draw.end );
		
		rc.NormalizeRect();

		rc.InflateRect( this->draw.pen.lopnWidth.x / 2 + 2 , this->draw.pen.lopnWidth.y / 2 + 2 );
		
		pDC->Rectangle( rc );
	}
	static CPen pen;

	if( pen.GetSafeHandle( ) )  pen.DeleteObject();

	pen.CreatePenIndirect( &this->draw.pen );

	static CBrush brush;

	if( brush.GetSafeHandle( ) ) brush.DeleteObject();

	brush.CreateBrushIndirect( &this->draw.brush );

	pDC->SelectObject( &pen );

	pDC->SelectObject( &brush );
}

void CDrawBase::OnLButtonDown( UINT nFlags, CPoint point )
{
	if( nFlags & MK_LBUTTON )

		this->draw.end = this->draw.start = point;
}

void CDrawBase::OnMouseMove( UINT nFlags, CPoint point )
{
	if( nFlags & MK_LBUTTON )
	{
		this->draw.end = point;
        //刷新
		this->view.Invalidate();
	}
}

void CDrawBase::OnLButtonUp( UINT nFlags, CPoint point )
{
	if( nFlags & MK_LBUTTON )
	{
		this->draw.end = point;
	}
}