经验总结

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MFC 学习笔记( 九 )

生活百科MFC 学习笔记

MFC绘图：

MFC 学习笔记

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绘图相关类：
MFC 学习笔记

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MFC 学习笔记

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伪代码：
绘图相关的***********************************************CPaintDC dc(pView) === CPaintDC::CPaintDC（...）//函数内部this为&dc{Attach(::BeginPaint(pView->m_hWnd, &m_ps)）//函数内部this为&dc{m_hDC = hDC;//将BeginPaint获取的绘图设备句柄保存到dc对象的一个成员变量中SetAttribDC(m_hDC)//函数内部this为&dc{m_hAttribDC = m_hDC;//dc对象的另一个成员变量也保存了绘图设备句柄}}}CPen pen(PS_SOLID, 2, RGB(255,0,0)) === CPen::CPen(PS_SOLID, 2, RGB(255,0,0))//函数内部this &pen{Attach(::CreatePen(PS_SOLID, 2, RGB(255,0,0))）//函数内部this &pen{m_hObject = hObject;//将::CreatePen获取的画笔句柄，保存到pen对象的一个成员变量中}}view类：
// MFCDrawView.cpp : implementation of the CMFCDrawView class//#include "stdafx.h"// SHARED_HANDLERS can be defined in an ATL project implementing preview, thumbnail// and search filter handlers and allows sharing of document code with that project.#ifndef SHARED_HANDLERS#include "MFCDraw.h"#endif#include "MFCDrawDoc.h"#include "MFCDrawView.h"#ifdef _DEBUG#define new DEBUG_NEW#endif// CMFCDrawViewIMPLEMENT_DYNCREATE(CMFCDrawView, CView)BEGIN_MESSAGE_MAP(CMFCDrawView, CView) // 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_WM_PAINT() ON_COMMAND(ID_CLIENT, &CMFCDrawView::OnClient) ON_COMMAND(ID_PEN, &CMFCDrawView::OnPen) ON_COMMAND(ID_BRUSH, &CMFCDrawView::OnBrush) ON_COMMAND(ID_FONT, &CMFCDrawView::OnFont) ON_COMMAND(ID_BMP, &CMFCDrawView::OnBmp)END_MESSAGE_MAP()// CMFCDrawView construction/destructionCMFCDrawView::CMFCDrawView(){ // TODO: add construction code here}CMFCDrawView::~CMFCDrawView(){}BOOL CMFCDrawView::PreCreateWindow(CREATESTRUCT& cs){ // TODO: Modify the Window class or styles here by modifying //the CREATESTRUCT cs return CView::PreCreateWindow(cs);}// CMFCDrawView drawingvoid CMFCDrawView::OnDraw(CDC* /*pDC*/){ CMFCDrawDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); if (!pDoc)return; // TODO: add draw code for native data here}// CMFCDrawView printingBOOL CMFCDrawView::OnPreparePrinting(CPrintInfo* pInfo){ // default preparation return DoPreparePrinting(pInfo);}void CMFCDrawView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/){ // TODO: add extra initialization before printing}void CMFCDrawView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/){ // TODO: add cleanup after printing}// CMFCDrawView diagnostics#ifdef _DEBUGvoid CMFCDrawView::AssertValid() const{ CView::AssertValid();}void CMFCDrawView::Dump(CDumpContext& dc) const{ CView::Dump(dc);}CMFCDrawDoc* CMFCDrawView::GetDocument() const // non-debug version is inline{ ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CMFCDrawDoc))); return (CMFCDrawDoc*)m_pDocument;}#endif //_DEBUG// CMFCDrawView message handlersvoid CMFCDrawView::OnPaint(){ CPaintDC dc(this); //::BeginPaint// dc.Rectangle( 100, 100, 300, 300 );//::Rectangle(...)// ::Rectangle( dc.m_hDC, 100, 100, 300, 300 );}void CMFCDrawView::OnClient(){ CClientDC dc(this); dc.Ellipse( 300, 300, 500, 500 );}void CMFCDrawView::OnPen(){ CClientDC dc( this ); CPen pen(PS_SOLID, 2, RGB(255,0,0));// CPen* oldpen = dc.SelectObject( &pen ); HGDIOBJ nOldPen = ::SelectObject( dc.m_hDC, pen.m_hObject );// dc.Rectangle( 100, 100, 300, 300 ); ::Rectangle( dc.m_hDC, 100, 100, 300, 300 );// dc.SelectObject( oldpen ); ::SelectObject( dc.m_hDC, nOldPen );// pen.DeleteObject( ); ::DeleteObject( pen.m_hObject );}void CMFCDrawView::OnBrush(){ CClientDC dc(this); CBrush brush(RGB(0,255,0)); CBrush* oldbrush = dc.SelectObject( &brush ); dc.Rectangle( 100, 100, 300, 300 ); dc.SelectObject( oldbrush ); brush.DeleteObject( );}void CMFCDrawView::OnFont(){ CClientDC dc( this ); CFont font; font.CreatePointFont(300, "黑体");//::CreateFont(..............) CFont* oldfont = dc.SelectObject( &font ); dc.TextOut( 100, 100, "hello"); dc.SelectObject( oldfont ); font.DeleteObject();}void CMFCDrawView::OnBmp(){ //添加位图资源(操作资源无需写代码) //创建一个和当前DC,相匹配的内存DC CClientDC dc( this ); CDC memdc; memdc.CreateCompatibleDC( &dc ); //::CreateCompatibleDC //将位图的数据送给内存DC CBitmap bmp; bmp.LoadBitmap( IDB_BITMAP1 ); //::LoadBitmap CBitmap* oldbmp = memdc.SelectObject( &bmp );//::SelectObject //成像 dc.BitBlt( 100, 100, 48, 48, &memdc, 0, 0, SRCCOPY );//::BitBlt //将位图数据要回来 memdc.SelectObject( oldbmp );//::SelectObject //销毁位图 bmp.DeleteObject( );//::DeleteObject //销毁内存DC memdc.DeleteDC( );//::DeleteDC}

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