wbpen.cpp

电子白板程序

// WBPen.cpp: implementation of the CWBPen class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "WBPen.h"
#include "DrawView.h"

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

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

CWBPen::CWBPen( CDrawView & view ) : CDrawBase( view )
{
	this->draw.tag = PEN;

	memset( &this->orgin , 0 , sizeof( POINT ) );
}

CWBPen::~CWBPen()
{

}

CDrawBase * CWBPen::Clone( void )
{
	CWBPen * obj = new CWBPen( this->view );
	
	memcpy( &obj->draw , &this->draw , sizeof( DRAW ) );
	
	return obj;
}

HCURSOR CWBPen::GetCursor( void )
{
	static HCURSOR hCursor = ::AfxGetApp()->LoadCursor( IDC_PEN );

	return hCursor;
}

bool CWBPen::Select( CRect & rc )
{
	rc.NormalizeRect();

	CRgn r0 , r1;

	r0.CreateRectRgn( rc.left , rc.top , rc.right , rc.bottom );

	r1.CreateRectRgn( 0 , 0 , 0 , 0 );

	POINT start , end;

	for( LIST_POINT::iterator itr = this->list_point.begin(); itr != this->list_point.end(); itr ++ )
	{
		if( itr == this->list_point.begin() )

			start = * itr;

		else
		{
			end = * itr;
			
			POINT pt[] = 
			{
				{ start.x , start.y } ,
				{ end.x , end.y } ,
				{ end.x + this->draw.pen.lopnWidth.x , end.y + ( this->draw.start.y == this->draw.end.y ? 1 : 0 ) } ,
				{ start.x + this->draw.pen.lopnWidth.x , start.y + ( this->draw.start.y == this->draw.end.y ? 1 : 0 ) }
			};
			start = end;
			
			CRgn r;

			r.CreatePolygonRgn( pt , sizeof( pt ) / sizeof( POINT ) , WINDING );

			r1.CombineRgn( &r1 , &r , RGN_OR );
		}
	}
	return this->draw_select = r0.CombineRgn( &r0 , &r1 , RGN_AND ) != NULLREGION;
}

void CWBPen::OnDraw( CDC * pDC )
{
	CDrawBase::OnDraw( pDC );

	POINT offset;
	//计算偏移量
	offset.x = this->draw.start.x - this->orgin.x;

	offset.y = this->draw.start.y - this->orgin.y;
	//保存原点
	this->orgin = this->draw.start;
	//把所有的点连线
	for( LIST_POINT::iterator itr = this->list_point.begin(); itr != this->list_point.end(); itr ++ )
	{	//偏移坐标
		itr->x += offset.x; itr->y += offset.y;
		//定位到起点
		if( itr == this->list_point.begin() )

			pDC->MoveTo( * itr );
		//连线
		else
			
			pDC->LineTo( * itr );
	}
}

char * CWBPen::Encode( int & size , bool erase )
{
	char * buf = CDrawBase::Encode( size , erase );

	if( buf && ! erase )
	{	//点数大小
		int s = this->list_point.size() * sizeof( POINT );
		//申请内存
		char * buffer = new char[ size + s ];

		char * now = buffer;

		memcpy( now , buf , size ); now += size;

		size += s;

		delete []buf;
		//保存所有的点
		for( LIST_POINT::iterator itr = this->list_point.begin(); itr != this->list_point.end(); itr ++ )
		{
			memcpy( now , &( * itr ), sizeof( POINT ) ); now += sizeof( POINT );
		}
		buf = buffer;
	}
	return buf;
}

bool CWBPen::Decode( char * buffer , int size )
{
	if( CDrawBase::Decode( buffer , size ) )
	{
		size -= this->draw_id.GetLength() + 1 + sizeof( DRAW );
		
		buffer += this->draw_id.GetLength() + 1 + sizeof( DRAW );

		while( size > 0 )
		{
			POINT point;

			memcpy( &point , buffer , sizeof( POINT ) );

			size -= sizeof( POINT ); buffer += sizeof( POINT );
			
			this->list_point.push_back( point );
			//计算包含画笔笔画的最大矩形
			if( this->draw.start.x > point.x ) this->draw.start.x = point.x;
			
			if( this->draw.start.y > point.y ) this->draw.start.y = point.y;
			
			if( this->draw.end.x < point.x ) this->draw.end.x = point.x;
			
			if( this->draw.end.y < point.y ) this->draw.end.y = point.y;
		}//保留原点
		this->orgin = this->draw.start;
		
		return true;
	}
	return false;
}

void CWBPen::OnLButtonDown( UINT nFlags, CPoint point )
{
	CDrawBase::OnLButtonDown( nFlags , point );

	if( nFlags & MK_LBUTTON )

		this->list_point.push_back( this->draw.start );
}

void CWBPen::OnMouseMove( UINT nFlags, CPoint point )
{
	if( nFlags & MK_LBUTTON )
	{	//计算包含画笔笔画的最大矩形
		if( this->draw.start.x > point.x ) this->draw.start.x = point.x;

		if( this->draw.start.y > point.y ) this->draw.start.y = point.y;

		if( this->draw.end.x < point.x ) this->draw.end.x = point.x;

		if( this->draw.end.y < point.y ) this->draw.end.y = point.y;
		//且规定原点在左上角
		this->orgin = this->draw.start;

		this->list_point.push_back( point );

		this->view.Invalidate();
	}
}

void CWBPen::OnLButtonUp( UINT nFlags, CPoint point )
{	
	this->orgin = this->draw.start;
}