基于litecad的程序画坐标轴及坐标文字

lcOnEventPaint( &CCADView::ProcPaint );

void CALLBACK CCADView::ProcPaint( HANDLE hLcWnd, HANDLE hView, int Mode, HDC hDC, int Left, int Top, int Right, int Bottom )
{
 int WIDTH = Right-Left;
 int HEIGHT = Bottom-Top;
  int DELTA = HEIGHT/6;

 //获取当前cad坐标
 currentLeft = lcPropGetFloat( hView, LC_PROP_VIEW_LEF );
  currentTop = lcPropGetFloat( hView, LC_PROP_VIEW_TOP );
 currentRight = lcPropGetFloat( hView, LC_PROP_VIEW_RIG );
 currentBottom = lcPropGetFloat( hView, LC_PROP_VIEW_BOT );

  double scaleX = (currentRight-currentLeft)/((WIDTH)*1.0);
 double scaleY = (currentTop-currentBottom)/((HEIGHT)*1.0);

  //定义字体格式
  HFONT hFont=CreateFont(10,10,0,0,FW_DONTCARE,false,false,false,
   CHINESEBIG5_CHARSET,OUT_CHARACTER_PRECIS,
   CLIP_CHARACTER_PRECIS,DEFAULT_QUALITY,
    FF_MODERN,L"Arial");
  SelectObject(hDC, hFont);
 SetBkMode(hDC, TRANSPARENT);
  SetTextColor(hDC, RGB(50,50,50));
 SetTextAlign(hDC, TA_LEFT);
 CString text;

 //litecad绘制之前，在HDC上绘制坐标轴
  if (Mode==0)
  {
   HPEN pen=CreatePen(NULL,2,RGB(50,50,50));
   SelectObject(hDC,pen);
    for (int i=1;(Top+DELTA*i)<Bottom;i++)
    {
     MoveToEx(hDC, Left, Top+DELTA*i, NULL);
     LineTo(hDC, Right, Top+DELTA*i);
      if (isCadInited)
      {
       text.Format(L"%.0f", currentTop-scaleY*DELTA*i);
        TextOut(hDC, Left+3, Top+DELTA*i+3, text, text.GetLength());
      }
   }

   for (int i=1;(Left+DELTA*i)<Right;i++)
    {
     MoveToEx(hDC, Left+DELTA*i, Top, NULL);
     LineTo(hDC, Left+DELTA*i, Bottom);
      if (isCadInited)
      {
       text.Format(L"%.0f", currentLeft+scaleX*DELTA*(i-1));
       TextOut(hDC, Left+DELTA*(i-1)+3, Bottom-15, text, text.GetLength());
      }
   }
 }
 //litecad绘制之后
 if (Mode==1)
  {
   //第一次初始化时要在cad画之后绘制坐标文字
   if (!isCadInited)
   {
     for (int i=1;(Top+DELTA*i)<Bottom;i++)
      {
       text.Format(L"%.0f", currentTop-scaleY*DELTA*i);
        TextOut(hDC, Left+3, Top+DELTA*i+3, text, text.GetLength());
      }

     for (int i=1;(Left+DELTA*i)<Right;i++)
      {
       text.Format(L"%.0f", currentLeft+scaleX*DELTA*(i-1));
       TextOut(hDC, Left+DELTA*(i-1)+3, Bottom-15, text, text.GetLength());
      }
     isCadInited = true;
   }
 }
}