graphicsview.cpp

MFC图形功能演示

// GraphicsView.cpp : implementation of the CGraphicsView class
//

#include "stdafx.h"
#include "Graphics.h"

#include "GraphicsDoc.h"
#include "GraphicsView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CGraphicsView

IMPLEMENT_DYNCREATE(CGraphicsView, CView)

BEGIN_MESSAGE_MAP(CGraphicsView, CView)
	//{{AFX_MSG_MAP(CGraphicsView)
	ON_WM_CREATE()
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_WM_MOUSEMOVE()
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
	ON_COMMAND_RANGE(IDM_DRAW_LINE,IDM_DRAW_FILL,OnSelectDrawType)
	ON_UPDATE_COMMAND_UI_RANGE(IDM_DRAW_LINE,IDM_DRAW_FILL,OnUpdateSelectDrawType)
    ON_COMMAND_RANGE(IDM_LINEWIDTH_ONE,IDM_LINEWIDTH_FIVE,OnSelectLineWidth)
	ON_UPDATE_COMMAND_UI_RANGE(IDM_LINEWIDTH_ONE,IDM_LINEWIDTH_FIVE,OnUpdateSelectLineWidth)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CGraphicsView construction/destruction

CGraphicsView::CGraphicsView()
{
	// TODO: add construction code here
    m_nDrawType=-1;
	m_nLineWidth=1;
	m_bDrawing=FALSE;
	m_pMemDC=new CDC;
	m_pBitmap=new CBitmap;
	m_cLineColor=RGB(255,0,0);
	m_cFillColor=RGB(0,255,0);
}

CGraphicsView::~CGraphicsView()
{
	delete m_pBitmap;
	delete m_pMemDC;
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CGraphicsView drawing

void CGraphicsView::OnDraw(CDC* pDC)
{
	CGraphicsDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here  
		CBitmap* pOldBitmap=m_pMemDC->SelectObject(m_pBitmap);
		pDC->BitBlt(0,0,m_nMaxX,m_nMaxY,m_pMemDC,0,0,SRCCOPY);
		m_pMemDC->SelectObject(pOldBitmap);
}

/////////////////////////////////////////////////////////////////////////////
// CGraphicsView printing

BOOL CGraphicsView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CGraphicsView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CGraphicsView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CGraphicsView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CGraphicsView message handlers

int CGraphicsView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CView::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	// TODO: Add your specialized creation code here
	m_nMaxX=GetSystemMetrics(SM_CXSCREEN);
	m_nMaxY=GetSystemMetrics(SM_CYSCREEN);

	CDC* pDC=GetDC();
	m_pMemDC->CreateCompatibleDC(pDC);
	m_pBitmap->CreateCompatibleBitmap(pDC,m_nMaxX,m_nMaxY);
	CBitmap* pOldBitmap=m_pMemDC->SelectObject(m_pBitmap);

	CBrush brush;
	brush.CreateStockObject(WHITE_BRUSH);
	//CBrush* pOldBrush=m_pMemDC->SelectObject(&brush);
	CRect rect(-1,-1,m_nMaxX,m_nMaxY);
	m_pMemDC->FillRect(rect,&brush);

	m_pMemDC->SelectObject(pOldBitmap);
	ReleaseDC(pDC);
	return 0;
}

void CGraphicsView::OnSelectDrawType(UINT nID)
{
	ASSERT(nID>=IDM_DRAW_LINE && nID<=IDM_DRAW_FILL);
	m_nDrawType=nID-IDM_DRAW_LINE;
}

void CGraphicsView::OnUpdateSelectDrawType(CCmdUI* pCmdUI)
{
	int nID=pCmdUI->m_nID-IDM_DRAW_LINE;
    if (m_nDrawType==nID)
        pCmdUI->SetCheck(TRUE);
	else
		pCmdUI->SetCheck(FALSE);
}

void CGraphicsView::OnSelectLineWidth(UINT nID)
{
	m_nLineWidth=(nID-IDM_LINEWIDTH_ONE)*2+1;
}

void CGraphicsView::OnUpdateSelectLineWidth(CCmdUI* pCmdUI)
{
	int nID=(pCmdUI->m_nID-IDM_LINEWIDTH_ONE)*2+1;
	if (m_nLineWidth==nID)
		pCmdUI->SetCheck(TRUE);
	else
		pCmdUI->SetCheck(FALSE);
}

void CGraphicsView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default	


	if (m_bDrawing)
       return;
	SetCapture();

	m_bDrawing=true;
    m_ptStart=point;

	if (m_nDrawType==3)
	{
		CBrush brFill;
		brFill.CreateSolidBrush(m_cFillColor);
		CBrush* pOldBrush=m_pMemDC->SelectObject(&brFill);
		CBitmap* pOldBitmap=m_pMemDC->SelectObject(m_pBitmap);
		Invalidate(FALSE);
		m_pMemDC->ExtFloodFill(point.x,point.y,m_pMemDC->GetPixel(point),FLOODFILLSURFACE);
		m_pMemDC->SelectObject(pOldBrush);
		m_pMemDC->SelectObject(pOldBitmap);
		m_bDrawing=false;
           
	}
//	CView::OnLButtonDown(nFlags, point);
}


void CGraphicsView::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
    if (m_bDrawing)
    {
		CDC* pDC=GetDC();

		CBitmap* pOldBitmap=m_pMemDC->SelectObject(m_pBitmap);

		CPen pen(PS_SOLID,m_nLineWidth,m_cLineColor);
		CPen* pOldPen=pDC->SelectObject(&pen);
		CBrush* pOldBrush=(CBrush*)pDC->SelectStockObject(NULL_BRUSH);

		CRect rectOld(m_ptStart,m_ptOld);
		rectOld.NormalizeRect();
		rectOld.InflateRect(m_nLineWidth,m_nLineWidth);

		pDC->BitBlt(rectOld.left,rectOld.top,rectOld.Width(),rectOld.Height(),
			m_pMemDC,rectOld.left,rectOld.top,SRCCOPY);

		CRect rectNew(m_ptStart,point);
		switch(m_nDrawType)
		{
		case 0:
            pDC->MoveTo(m_ptStart);
			pDC->LineTo(point);
			break;
		case 1:
			pDC->Rectangle(&rectNew);
			break;
		case 2:
			pDC->Ellipse(&rectNew);
		    break;
		case 3:
		default:
		    break;
		}
		m_pMemDC->SelectObject(pOldBitmap);
		pDC->SelectObject(pOldPen);
		pDC->SelectObject(pOldBrush);
		ReleaseDC(pDC);

		m_ptOld=point;

    }
	
	//CView::OnMouseMove(nFlags, point);
}

void CGraphicsView::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if (m_bDrawing)
	{   
        m_bDrawing=FALSE;
		CBitmap* pOldBitmap=m_pMemDC->SelectObject(m_pBitmap);
		CPen pen(PS_SOLID,m_nLineWidth,m_cLineColor);
		CPen *pOldPen=m_pMemDC->SelectObject(&pen);
		CBrush* pOldBrush=(CBrush*)m_pMemDC->SelectStockObject(NULL_BRUSH);
        CRect rect(m_ptStart,point);
		switch(m_nDrawType)
		{
		case 0:
			m_pMemDC->MoveTo(m_ptStart);
			m_pMemDC->LineTo(point);
			break;
		case 1:
			m_pMemDC->Rectangle(&rect);
			break;
		case 2:
			m_pMemDC->Ellipse(&rect);
		    break;
		case 3:
		default:
		    break;
		}
		Invalidate(FALSE);
		m_pMemDC->SelectObject(pOldBitmap);
		m_pMemDC->SelectObject(pOldPen);
		m_pMemDC->SelectObject(pOldBrush);
	}
	ReleaseCapture();
	//CView::OnLButtonUp(nFlags, point);
}