lq01view.cpp

用多态实现的画图小程序

// lq01View.cpp : implementation of the CLq01View class
//

#include "stdafx.h"
#include "lq01.h"
#include "line.h"
#include "shape.h"
#include "myrect.h"
#include "lq01Doc.h"
#include "lq01View.h"

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

/////////////////////////////////////////////////////////////////////////////
// CLq01View

IMPLEMENT_DYNCREATE(CLq01View, CView)

BEGIN_MESSAGE_MAP(CLq01View, CView)
	//{{AFX_MSG_MAP(CLq01View)
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_WM_MOUSEMOVE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CLq01View construction/destruction

CLq01View::CLq01View()
{
	//m_nShape=0;
	// TODO: add construction code here

}

CLq01View::~CLq01View()
{
}

BOOL CLq01View::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CLq01View drawing

void CLq01View::OnDraw(CDC* pDC)
{
	CLq01Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	int iPos;
	for (iPos=0;iPos<GetDocument()->GetShapeCount ();iPos++)
	{
		CShape * pShape=GetDocument()->GetShape(iPos);
		
		pShape->Draw (pDC,pShape->GetPs(),pShape->GetPe(),pShape->GetColor());
	}


}

/////////////////////////////////////////////////////////////////////////////
// CLq01View diagnostics

#ifdef _DEBUG
void CLq01View::AssertValid() const
{
	CView::AssertValid();
}

void CLq01View::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CLq01Doc* CLq01View::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CLq01Doc)));
	return (CLq01Doc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CLq01View message handlers

void CLq01View::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	
	beDraw=TRUE;
	m_ptS=m_ptE=m_ptPre=point;
	m_MyShape=GetDocument()->CreatShape (m_ptPre,point,m_nColor);
	SetCapture();
	CView::OnLButtonDown(nFlags, point);
}

void CLq01View::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
		if (GetCapture() != this)
                return;
		CDC *pDC=GetDC();
		m_MyShape->Draw (pDC,m_ptS,m_ptPre,m_nColor);
		m_ptE=point;
		beDraw=FALSE;
		ReleaseCapture();
		if(m_ptS!=m_ptE)
		{
			m_MyShape=GetDocument()->AddShape (m_ptS,m_ptE,m_nColor);
			m_MyShape->Draw (pDC,m_ptS,m_ptE,m_nColor);
						
		}
		else
			;




	CView::OnLButtonUp(nFlags, point);
}

void CLq01View::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if(beDraw==TRUE)
	{
				if((nFlags &MK_LBUTTON)==MK_LBUTTON)
			{
				if (GetCapture()==this)
				{
					CDC *pDC=GetDC();
					pDC->SelectStockObject (NULL_BRUSH);
					pDC->SetROP2 (R2_NOTXORPEN);		
														
					m_ptE=point;						
					
					m_nShape=GetDocument()->GetShape();
					m_nColor=GetDocument()->GetColor ();
					m_MyShape->Draw (pDC,m_ptS,m_ptPre,m_nColor);
					m_MyShape->Draw (pDC,m_ptS,m_ptE,m_nColor);
					m_ptPre=m_ptE;
				}
				CView::OnMouseMove(nFlags, point);
				}
	}
	else
		;

		
}