MFC小程序

1.将菜单栏归零，工具栏放在窗口低部，加载自己新建的工具栏

CMainFrame::OnCreate（）函数中 this->SetMenu(0);

2.将窗口初始化为最大化

APP类中：m_pMainWnd->ShowWindow(SW_MAXIMIZE);

3.去掉边框

CMainFrame::PreCreateWindow（）函数中 cs.style = WS_POPUP;
4.在FRAME类中添加工具栏命令消息，关闭

通过ON_COMMAND(ToolBar下的图片ID,实现的函数) this->PostMessage(WM_CLOSE);

5.在VIEW类中添加系统消息keydown

void CDRAWView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)

{

if(nChar == VK_ESCAPE)

{

AfxGetMainWnd()->PostMessage(WM_CLOSE);

}

CView::OnKeyDown(nChar, nRepCnt, nFlags);

}

6.将桌面背景贴到窗口上
在Frame.h中添加成员变量和成员函数

1class CMainFrame : public CFrameWnd
2{
3    public:
4    int m_ScreenX;
5    int m_ScreenY;
6    stack<CBitmap*> stk;//保存图片，实现撤销操作
7}

Frame.cpp的构造函数和析构函数

1CMainFrame::CMainFrame()
2{
3    m_ScreenX = GetSystemMetrics(SM_CXSCREEN);//屏幕长（调用函数为获取屏幕分辨率）
4    m_ScreenY = GetSystemMetrics(SM_CYSCREEN);//屏幕宽
5    CWindowDC dc(GetDesktopWindow());//获取桌面屏幕
6    CDC cdc;
7    cdc.CreateCompatibleDC(&dc);//兼容性DC相当于没有画纸的DC
8    CBitmap* bitmap = new CBitmap;
9    bitmap->CreateCompatibleBitmap(&dc,m_ScreenX,m_ScreenY);//创建一个兼容性位图，第一个参数
10    cdc.SelectObject(bitmap);//将画纸放在DC上（只有兼容性DC才可以放画纸）
11    cdc.BitBlt(0,0,m_ScreenX,m_ScreenY,&dc,0,0,SRCCOPY);
12    stk.push(bitmap);
13}
14
15CMainFrame::~CMainFrame()
16{
17    if(stk.empty() == false)
18    {
19        delete(stk.top());
20        stk.pop();
21    }
22}

VIEW.cpp

1void CDRAWView::OnDraw(CDC* /*pDC*/)
2{
3    CDRAWDoc* pDoc = GetDocument();
4    ASSERT_VALID(pDoc);
5    if (!pDoc)
6        return;
7
8    CMainFrame* pFrame = (CMainFrame*)AfxGetMainWnd();//父类指针强转为子类，才可使用子类特有变量
9    CClientDC dc(this);
10    CDC cdc;
11    cdc.CreateCompatibleDC(&dc);
12    cdc.SelectObject(pFrame->stk.top());
13    dc.BitBlt(0,0,pFrame->m_ScreenX,pFrame->m_ScreenY,&cdc,0,0,SRCCOPY);
14    
15}

7.添加工具栏

在资源视图中Toolbar下自行绘制，更改对应ID;

在resource.h中将宏改为连续数字

ON_COMMAND_RANGE(ID_PEN,ID_ELLIPSE,&CDRAWView::ONChangeDrawStyle)//连续宏可使用

声明枚举类型 enum{PEN,LINE,RECTANGLE,TRIANGLE,ELLIPSE};（铅笔，直线，长方形，三角形，椭圆形）与resource.h中的顺序对应

1在View.h中
2
3class CDRAWView : public CView
4{
5    public:
6    int m_DrawStyle;
7    void ONChangeDrawStyle(UINT uid);
8    bool m_blsFlag;
9    CPoint PointMouseDown;
10};

在View.cpp中

1void CDRAWView::ONChangeDrawStyle(UINT uid)
2{
3    m_DrawStyle = uid - ID_PEN;
4}
5CDRAWView::CDRAWView()
6{
7    m_DrawStyle = ID_PEN;
8    m_blsFlag = false;
9}
10void CDRAWView::OnLButtonDown(UINT nFlags, CPoint point)
11{
12    m_blsFlag = true;
13    PointMouseDown = point;
14    CView::OnLButtonDown(nFlags, point);
15}
16
17
18void CDRAWView::OnLButtonUp(UINT nFlags, CPoint point)
19{
20    m_blsFlag = false;
21
22    CView::OnLButtonUp(nFlags, point);
23}
24
25
26void CDRAWView::OnMouseMove(UINT nFlags, CPoint point)
27{
28    CClientDC dc(this);
29    CMainFrame* pFrame = (CMainFrame*)AfxGetMainWnd();
30    if(m_blsFlag)
31    {
32        if(m_DrawStyle == PEN)
33        {
34            dc.MoveTo(PointMouseDown.x,PointMouseDown.y);
35            dc.LineTo(point.x,point.y);
36            PointMouseDown = point;
37            return ;
38        }
39        else
40        {
41            //======================================解决闪屏========================================
42            CDC MemDC;
43            MemDC.CreateCompatibleDC(&dc);
44            CBitmap* bitmap = new CBitmap;
45            bitmap->CreateCompatibleBitmap(&dc,pFrame->m_ScreenX,pFrame->m_ScreenY);
46            MemDC.SelectObject(bitmap);
47            //-------------------------------------栈顶图片贴图擦除痕迹------------------------------------------------
48            CDC cdc;
49            cdc.CreateCompatibleDC(&dc);
50            cdc.SelectObject(pFrame->stk.top());
51            MemDC.BitBlt(0,0,pFrame->m_ScreenX,pFrame->m_ScreenY,&cdc,0,0,SRCCOPY);　　　　　　　//-------------------------------------------------------------------------------------------------------
52            switch(m_DrawStyle)
53            {
54            case LINE:
55                MemDC.MoveTo(PointMouseDown.x,PointMouseDown.y);
56                MemDC.LineTo(point.x,point.y);
57                break;
58            case TRIANGLE:
59                {
60                    POINT points[3] = {{(PointMouseDown.x+point.x)/2,PointMouseDown.y},{PointMouseDown.x,point.y},{point.x,point.y}};
61                    MemDC.Polygon(points,3);
62                }
63                break;
64            case ELLIPSE:
65                MemDC.Ellipse(PointMouseDown.x,PointMouseDown.y,point.x,point.y);
66                break;
67            case RECTANGLE:
68                MemDC.Rectangle(PointMouseDown.x,PointMouseDown.y,point.x,point.y);
69                break;
70            }
71            dc.BitBlt(0,0,pFrame->m_ScreenX,pFrame->m_ScreenY,&MemDC,0,0,SRCCOPY);
72            //===================================================================================================
73        }
74    }
75
76    CView::OnMouseMove(nFlags, point);
77}

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