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Visual C++

Draw.cpp：源码内容
							// Draw.cpp: implementation of the CDraw class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "Draw.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CDraw::CDraw( CDrawView * view )
{
	this->userName = "";
	this->drawId = ( int )this;
	this->type = 0;
	this->view = view;
	this->dcSize = this->view->GetTotalSize( );
	this->start = CPoint( 0 , 0 );
	this->end = CPoint( 0 , 0 );
}
CDraw::~CDraw()
{
	this->type = 0;
}
void CDraw::SetColor( COLORREF color )
{
	int width = this->GetWidth( );
	if( this->pen.GetSafeHandle( ) )
		this->pen.DeleteObject( );
	this->pen.CreatePen( PS_SOLID , width , color );
	this->SetEmpty( this->IsEmpty( ) );
}
COLORREF CDraw::GetColor( void )
{
	LOGPEN logPen;
	logPen.lopnColor = RGB( 0 , 0 , 0 );
	if( this->pen.GetSafeHandle( ) )
		this->pen.GetLogPen( &logPen );
	return logPen.lopnColor;
}
//设定画笔宽度
void CDraw::SetWidth( int width )
{
	COLORREF color = this->GetColor( );
	if( this->pen.GetSafeHandle( ) )
		this->pen.DeleteObject( );
	this->pen.CreatePen( PS_SOLID , width , color );
}
//取得画笔宽度
int CDraw::GetWidth( void )
{
	LOGPEN logPen;
	logPen.lopnWidth.x = 1;
	if( this->pen.GetSafeHandle( ) )
		this->pen.GetLogPen( &logPen );
	return logPen.lopnWidth.x;
}
//设定画刷是否为空，缺省情况为空
void CDraw::SetEmpty( bool m_bEmpty )
{
	LOGBRUSH lb;
	lb.lbColor = this->GetColor( );
	lb.lbHatch = 0;
	lb.lbStyle = m_bEmpty ? BS_HOLLOW : BS_SOLID;
	if( this->brush.GetSafeHandle( ) )
		this->brush.DeleteObject( );
	this->brush.CreateBrushIndirect( &lb );
}
//判断画刷是否为空 
bool CDraw::IsEmpty( void )
{
	LOGBRUSH lb;
	lb.lbStyle = BS_HOLLOW;
	if( this->brush.GetSafeHandle( ) )
		
		this->brush.GetLogBrush( &lb );
	return lb.lbStyle == BS_HOLLOW;
}
CDC * CDraw::Draw( CDC * pDC )
{
	if( pDC == NULL )
		pDC = this->view->GetMemDC( );
	if( ! this->rgn.GetSafeHandle( ) )
	{
		if( this->pen.GetSafeHandle( ) )
			
			pDC->SelectObject( &this->pen );
		
		if( this->brush.GetSafeHandle( ) )
			
			pDC->SelectObject( &this->brush );
	}
	else
	{
		CBrush b( this->GetColor( ) );
		pDC->FillRgn( &this->rgn , &b );
		pDC = NULL;
	}
	return pDC;
}
void CDraw::LButtonDown( UINT nFlags , CPoint point )
{
	if( nFlags & MK_LBUTTON )
		
		this->start = this->end = point;
}
void CDraw::LButtonUp( UINT nFlags , CPoint point )
{   //重画
	CDC * pDC = this->Draw( );
	this->view->Invalidate( );
	if( this->rgn.GetSafeHandle( ) )
		
		this->rgn.DeleteObject( );
	CWaitCursor cursor;
	CDC memDC;
	memDC.CreateCompatibleDC( pDC );
	CBitmap bmp;
	bmp.CreateCompatibleBitmap( pDC , this->dcSize.cx , this->dcSize.cy );
	memDC.SelectObject( &bmp );  
    //填充白色
	memDC.FillSolidRect( 0 , 0 , this->dcSize.cx , this->dcSize.cy , memDC.GetBkColor( ) );
    //单独在背景图上画图元
	this->Draw( &memDC );
	//图像大小
	int width = this->GetWidth( );
	//计算出矩形框区域
	CRect rc( this->start , this->end );
	rc.NormalizeRect( );
	rc.InflateRect( width + 2 , width + 2 );
    //线条颜色
	int color = this->GetColor( );
    //判断是否空心
	bool m_bEmpty = this->IsEmpty( );
 
	if( m_bEmpty )
		//如果是空心的，那么创建一个空的区域 
		this->rgn.CreateRectRgn( 0 , 0 , 0 , 0 );
	else
        //否则创建一个实心区域
		this->rgn.CreateRectRgn( rc.left , rc.top , rc.right , rc.bottom );
	CRgn r;
	//循环把不是图元的区域去掉 
	for( int h = rc.top ; h < rc.bottom; h ++ )
		
		for( int w = rc.left; w < rc.right ; w ++ )
		{	
			if( m_bEmpty )
			{
				if( memDC.GetPixel( w , h ) == color )
				{
					r.CreateRectRgn( w , h , w + 1 , h + 1 );
					
					this->rgn.CombineRgn( &this->rgn , &r , RGN_OR );
					
					r.DeleteObject( );
				}
			}
			else
			{
				if( memDC.GetPixel( w , h ) != color )
				{
					r.CreateRectRgn( w , h , w + 1 , h + 1 );
					
					this->rgn.CombineRgn( &this->rgn , &r , RGN_DIFF );
					
					r.DeleteObject( );
				}
			}
		}
}
void CDraw::MouseMove( UINT nFlags , CPoint point )
{
	if( nFlags & MK_LBUTTON )
	{
		CDC * pDC = this->view->GetMemDC( );
        //删掉画过的图像
		int rop = pDC->SetROP2( R2_NOTXORPEN );
		this->Draw( pDC );
		this->end = point;
        //重画 
		this->Draw( pDC );
        //恢复
		pDC->SetROP2( rop );
        //刷新
		this->view->Invalidate( );
	}
}

						