circle.cpp

电子白板程序

// Circle.cpp: implementation of the CCircle class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "Circle.h"
#include "DrawView.h"

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

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

CCircle::CCircle( CDrawView & v ) : CLine( v )
{
	this->draw.tag = CIRCLE;
}

CCircle::~CCircle()
{

}

CDrawBase * CCircle::Clone( void )
{
	CCircle * obj = new CCircle( this->view );

	memcpy( &obj->draw , &this->draw , sizeof( DRAW ) );

	return obj;
}

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

	CRgn r0 , r1;

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

	CRect r( this->draw.start , this->draw.end );
	
	r.NormalizeRect();

	r1.CreateEllipticRgn( r.left , r.top , r.right , r.bottom );

	if( this->draw.brush.lbStyle == BS_NULL )
	{
		CRgn r2;

		r.DeflateRect( this->draw.pen.lopnWidth.x + 1 , this->draw.pen.lopnWidth.y + 1 );

		r2.CreateEllipticRgn( r.left , r.top , r.right , r.bottom );

		r1.CombineRgn( &r1 , &r2 , RGN_DIFF );
	}
	return this->draw_select = r0.CombineRgn( &r0 , &r1 , RGN_AND ) != NULLREGION;
}

void CCircle::OnMouseMove( UINT nFlags , CPoint point )
{
	if( nFlags & MK_SHIFT )
	{    //计算最小的边
		int min = min( abs( point.x - this->draw.start.x ) , abs( point.y - this->draw.start.y ) );
		//计算最小的矩形
		point.x = this->draw.start.x + ( point.x > this->draw.start.x ? 1 : -1 ) * min;
		
		point.y = this->draw.start.y + ( point.y > this->draw.start.y ? 1 : -1 ) * min;
	}
	CDrawBase::OnMouseMove( nFlags , point );
}

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

	CRect rc( draw.start , draw.end );
	
	rc.NormalizeRect( );
	
	pDC->Ellipse( rc );
}