VC++ 绘制简单电子元件

工具:

http://blog.csdn.net/bcbobo21cn/article/details/44200205

demo工程:

http://pan.baidu.com/s/1qYCE9rQ

新建一个工程

更改窗口标题；

添加工具栏图标；

添加工具栏按钮的状态栏提示；

添加工具栏按钮的事件函数，此时需要手动添加；

视类头文件手动添加

//{{AFX_MSG(CDzyjView)
afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
afx_msg void OnDrawdz();  //手动添加
afx_msg void OnDrawdr();  //手动添加
afx_msg void OnDrawdg();  //手动添加
afx_msg void OnDrawerjg();  //手动添加
//}}AFX_MSG

视类实现文件添加

BEGIN_MESSAGE_MAP(CDzyjView, CView)
//{{AFX_MSG_MAP(CDzyjView)
ON_WM_LBUTTONDOWN()
//}}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(ID_BUTTONdz, CDzyjView::OnDrawdz)  //手动添加
ON_COMMAND(ID_BUTTONdr, CDzyjView::OnDrawdr)  //手动添加
ON_COMMAND(ID_BUTTONdg, CDzyjView::OnDrawdg)  //手动添加
ON_COMMAND(ID_BUTTONerjg, CDzyjView::OnDrawerjg)  //手动添加
END_MESSAGE_MAP()

新加工具栏按钮的响应函数中设定绘制元件类别

void CDzyjView::OnDrawdz()
              {
                   //MessageBox("dz","提示",MB_OK);
yjtype=1;
               }

视类头文件添加成员变量和函数

private:
CPoint point1;
int yjtype;
CPoint Four_Point[4];


// Operations
public:
void Drawdz(CDC *pDC);
void Drawdr(CDC *pDC);
void Drawdg(CDC *pDC);
void Drawerjg(CDC *pDC);

添加鼠标单击响应函数

鼠标左键按下时，获取绘制点中心坐标；刷新窗口；

void CDzyjView::OnLButtonDown(UINT nFlags, CPoint point) 
{
// TODO: Add your message handler code here and/or call default
point1.x=point.x;
point1.y=point.y;
Invalidate();
CView::OnLButtonDown(nFlags, point);
}

画电阻函数

void CDzyjView::Drawdz(CDC *pDC)
{
pDC->MoveTo(point1.x-20,point1.y);
pDC->LineTo(point1.x-12,point1.y);
pDC->MoveTo(point1.x+20,point1.y);
pDC->LineTo(point1.x+12,point1.y);
Four_Point[0].x=point1.x-12;
Four_Point[0].y=point1.y-5;
Four_Point[1].x=point1.x+12;
Four_Point[1].y=point1.y-5;
Four_Point[2].x=point1.x+12;
Four_Point[2].y=point1.y+5;
Four_Point[3].x=point1.x-12;
Four_Point[3].y=point1.y+5;
pDC->Polygon(Four_Point,4);
//pDC->Polyline(Four_Point,4);


/*
pDC->MoveTo(Four_Point[0]);
pDC->LineTo(Four_Point[1]);
pDC->MoveTo(Four_Point[1]);
pDC->LineTo(Four_Point[2]);
pDC->MoveTo(Four_Point[2]);
pDC->LineTo(Four_Point[3]);
pDC->MoveTo(Four_Point[3]);
pDC->LineTo(Four_Point[0]);
*/
}

在OnDraw中调用画电阻函数

void CDzyjView::OnDraw(CDC* pDC)
{
CDzyjDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
// TODO: add draw code for native data here


switch(yjtype)
{
case 1:
Drawdz(pDC);
break;
case 2:
break;
default:
break;
}
}

看下效果；

关于  local function definitions are illegal 错误

F:\vc6prj\图形图像\dzyj\dzyjView.cpp(80) : error C2601: 'OnPreparePrinting' : local function definitions are illegal
......

执行 cl.exe 时出错.

编译时出现一堆  local function definitions are illegal 错误；一个可能原因是丢失了反大括号；
void CDzyjView::OnDraw(CDC* pDC)
{
CDzyjDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
// TODO: add draw code for native data here


switch(yjtype)
{
case 1:
Drawdz(pDC);
break;
case 2:
break;
default:
break;
}
}     // 丢失此大括号会产生 local function definitions are illegal

今天先到这里......