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Visual C++

SelectDraw.cpp：源码内容
							// SelectDraw.cpp: implementation of the CSelectDraw class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "..WB.h"
#include "SelectDraw.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CSelectDraw::CSelectDraw( CDrawView * view ) : CDraw( view )
{
	this->type = SELECT;
	this->m_bErase = false;
	if( this->pen.GetSafeHandle( ) )
		this->pen.DeleteObject( );
	this->pen.CreatePen( PS_DOT , 1 , RGB( 0 , 0 , 0 ) );
	if( this->brush.GetSafeHandle( ) )
		this->brush.DeleteObject( );
	this->brush.CreateStockObject( NULL_BRUSH );
}
CSelectDraw::~CSelectDraw( )
{
	if( ! this->draw_list.empty( ) && ::IsWindow( this->view->GetSafeHwnd( ) ) )
	{
		CDC * pDC = this->view->GetMemDC( );
		int rop = pDC->SetROP2( R2_NOTXORPEN );
		//恢复选中的图元
		CRect rc;
		for( DRAW_LIST::iterator itr = this->draw_list.begin( ); itr != this->draw_list.end( ); itr++ )
		{	
			( * itr )->GetRgn( ).GetRgnBox( &rc );
			rc.InflateRect( 1 , 1 , 1 , 1 );
			pDC->Rectangle( &rc );
		}
		pDC->SetROP2( rop );
		this->draw_list.clear( );
		this->view->Invalidate( );
	}
}
//设定画笔颜色
void CSelectDraw::SetColor( COLORREF color )
{
	for( DRAW_LIST::iterator itr = this->draw_list.begin( ); itr != this->draw_list.end( ); itr ++ )
	{
		( * itr )->SetColor( color );
		( * itr )->Draw( );
		this->view->assembleData( * itr , CDrawView::MODIFY );
	}
	this->view->Invalidate( );
}
//取得画笔颜色
COLORREF CSelectDraw::GetColor( void )
{
	return RGB( 0 , 0 , 0 );
}
//设定画笔宽度
void CSelectDraw::SetWidth( int width )
{
	for( DRAW_LIST::iterator itr = this->draw_list.begin( ); itr != this->draw_list.end( ); itr ++ )
	{
		( * itr )->SetWidth( width );
		( * itr )->Draw( );
	}
	this->view->Invalidate( );
}
//取得画笔宽度
int CSelectDraw::GetWidth( void )
{
	return 1;
}
//设定画刷是否为空，缺省情况为空
void CSelectDraw::SetEmpty( bool m_bEmpty )
{
	this->m_bErase = m_bEmpty;
}
//判断画刷是否为空 
bool CSelectDraw::IsEmpty( void )
{
	return this->m_bErase;
}
//选择图元
void CSelectDraw::Select( void )
{   //取出内存画布
	CDC * pDC = this->view->GetMemDC( );
    //清除选择过的图元
	this->draw_list.clear( );
    //选择的矩形区域
	CRect rc( this->start , this->end );
	rc.NormalizeRect( );
    //清除所有图元后在重画没有被删除掉的图元
	pDC->FillSolidRect( 0 , 0 , this->dcSize.cx , this->dcSize.cy , pDC->GetBkColor( ) );
    //创建选择的区域
	if( this->selRgn.GetSafeHandle( ) )
		this->selRgn.DeleteObject( );
	this->selRgn.CreateRectRgn( 0 , 0 , 0 , 0 );
	CRgn r , r0;
	r.CreateRectRgn( 0 , 0 , 0 , 0 );
    //创建鼠标包含的区域
	r0.CreateRectRgn( rc.left , rc.top , rc.right , rc.bottom );
    //取得列表
	DRAW_LIST * drawlst = view->LockList( );
	bool m_bDelete = false;
	CDraw * draw = NULL;
    //设定选择画布
	pDC->SelectObject( &this->pen );
	pDC->SelectObject( &this->brush );
    //搜索所有图元
	for( DRAW_LIST::iterator itr = drawlst->begin( ); itr != drawlst->end( ); )
	{
		m_bDelete = false;
		draw = * itr;
        //选中了一个图元 
		if( r.CombineRgn( &r0 , &draw->GetRgn( ) , RGN_AND ) != NULLREGION )
		{
			if( this->m_bErase )
			{   //删除一个图元
				itr = drawlst->erase( itr );
				this->view->assembleData( draw , CDrawView::DEL );
				delete draw;
				m_bDelete = true;
			}
			else //选择一个图元
			{
				draw->Draw( pDC );
				this->draw_list.push_back( draw );
				draw->GetRgn( ).GetRgnBox( &rc );
				rc.InflateRect( 1 , 1 , 1 , 1 );
                //画出矩形框 
				pDC->Rectangle( &rc );
				CRgn rr;
                //保存图元所在的最大矩形空间
				rr.CreateRectRgn( rc.left , rc.top , rc.right , rc.bottom );
				this->selRgn.CombineRgn( &this->selRgn , &rr , RGN_OR );
			}
		}
		else //没有删除，画出图元
		  
			draw->Draw( pDC );
		if( ! m_bDelete )
			
			itr ++;
	}
	this->view->UnlockList( );
	this->view->Invalidate( );
}
void CSelectDraw::LButtonDown( UINT nFlags , CPoint point )
{
	CDraw::LButtonDown( nFlags , point );
    //如果有图元选中且鼠标的当前位置不在选中区域，那么清除所有的选择 
	if( ! this->draw_list.empty( ) && ! this->selRgn.PtInRegion( point ) )
	{
		CDC * pDC = this->view->GetMemDC( );
		int rop = pDC->SetROP2( R2_NOTXORPEN );
		CRect rc;
		for( DRAW_LIST::iterator itr = this->draw_list.begin( ); itr != this->draw_list.end( ); itr ++ )
		{
			( * itr )->GetRgn( ).GetRgnBox( &rc );
			rc.InflateRect( 1 , 1 , 1 , 1 );
			pDC->Rectangle( &rc );
		}
		pDC->SetROP2( rop );
        //清除选择列表和选择框
		this->draw_list.clear( );
		this->selRgn.DeleteObject( );
	}
}
void CSelectDraw::MouseMove( UINT nFlags , CPoint point )
{   //设定鼠标形状
	if(  this->selRgn.GetSafeHandle( ) )
	{
		HCURSOR hCursor = ::AfxGetApp( )->LoadStandardCursor( MAKEINTRESOURCE( this->selRgn.PtInRegion( point ) ? IDC_SIZEALL : IDC_ARROW ) );
		hCursor = ( HCURSOR )::SetClassLong( this->view->GetSafeHwnd( ) , GCL_HCURSOR , ( long )hCursor );
		::DestroyCursor( hCursor );
	}
	if( nFlags & MK_LBUTTON )
	{   //如果位图为空 
		if( this->draw_list.empty( ) )
			
			CDraw::MouseMove( nFlags , point );
		
		else if( this->selRgn.GetSafeHandle( ) )
		{   //计算移动的方向和大小
			CPoint pt = point - this->end;
			this->end = point;
            //移动区域 
			this->selRgn.OffsetRgn( pt );
			CDC * pDC = this->view->GetMemDC( );
			CRect rc;
			int rop = pDC->SetROP2( R2_NOTXORPEN );
			//移动图元
			for( DRAW_LIST::iterator itr = this->draw_list.begin( ); itr != this->draw_list.end( ); itr ++ )
			{
				( * itr )->GetRgn( ).GetRgnBox( &rc );
				rc.InflateRect( 1 , 1 , 1 , 1 );
                //清除矩形框 
				pDC->Rectangle( &rc );
				//移动矩形框 
				( * itr )->GetRgn( ).OffsetRgn( pt );
				rc.OffsetRect( pt );
                
				pDC->Rectangle( &rc );				
			}
			rop = pDC->SetROP2( rop );
			this->view->Invalidate( );
		}
	}
}
void CSelectDraw::LButtonUp( UINT nFlags , CPoint point )
{
	this->end = point;
	
	if( ! this->draw_list.empty( ) )
	{	
		CDC * pDC = this->view->GetMemDC( );
		//删掉所有的图像
		pDC->FillSolidRect( 0 , 0 , this->dcSize.cx , this->dcSize.cy , pDC->GetBkColor( ) );
		DRAW_LIST * drawlst = this->view->LockList( );
		for( DRAW_LIST::iterator itr = drawlst->begin( ); itr != drawlst->end( ); itr ++ )
			( * itr )->Draw( pDC );
		//画出选择的矩形框和通知外部程序
		CRect rc;
		for( itr = this->draw_list.begin( ); itr != this->draw_list.end( ); itr ++ )
		{
			( * itr )->GetRgn( ).GetRgnBox( &rc );
			this->view->assembleData( *itr , CDrawView::MODIFY );
			rc.InflateRect( 1 , 1 , 1 , 1 );
			pDC->Rectangle( rc );
		}//重画
		this->view->UnlockList( );
		this->view->Invalidate( );		
	}
	else 
	{
		if( this->end == this->start )
			
			this->end.Offset( 1 , 1 );
		
		this->Select( );
	}
}
CDC * CSelectDraw::Draw( CDC * pDC )
{
	pDC = CDraw::Draw( pDC );
	
	if( pDC )
	{
		CRect rc( this->start , this->end );
		
		rc.NormalizeRect( );
		
		pDC->Rectangle( &rc );
	}
	return pDC;
}

						