使用AcGiTextStyle获得MTEXT的准确的宽度

由于使用AcDbMtext的extents()方法，只能得到MTEXT的外框，得不到字体的准确宽度，下面是用AcGiTextStyle的解决方法，得到准确的字体宽度。  HOW TO GET A TEXT STRING'S ACTUAL WIDTH  Product AUTOCAD Author LEE,HENRY  Date 26-MAR-99 Document ID 29095  Expiration date Attachments  Keywords API_R14_OK; API_TAHOE_OK; ARX  Developer Consulting Group technical solution. Autodesk confidential, for ADN members only. Please read the disclaimer  Question  We are trying to determine the actual width of the text in an AcDbMText  entity. There is an extents() function which gives the width of the bounding  box. However What I need is the length of the text itself and not its  bounding box. Many times it so happens that the bounding box is much  larger than the actual text itself. Is there a way of doing that?  Answer  Yes, there is a way but not directly from AcDbMText methods. What you said is  true so we must look else where to find an solution. It is from AcGiTextStyle  which has a method called extents(). It gives you the actual width in an  AcGePoint2d.  Here is a code snippet which demonstrates how to obtain the string width from  a user input string.  void getTextStrWidth()  {  char str[132];  int rt = acedGetString(true, "/nEnter a string: ", str);  if(rt != RTNORM)  {  acutPrintf("/nInvalid input, try again.");  return;  }  AcGiTextStyle iStyle;  AcDbTextStyleTable* pTable = NULL;  AcDbTextStyleTableRecord* pRecord = NULL;  try{  ARXOK(curDoc()->database()->getTextStyleTable(pTable,  AcDb::kForRead));  const char styleName[] = "STANDARD";  ARXOK(pTable->getAt(styleName, pRecord, AcDb::kForRead));  ARXOK(fromAcDbTextStyle(iStyle, pRecord->objectId()));  pRecord->close();  pTable->close();  }  catch(const Acad::ErrorStatus es)  {  acutPrintf("/nError: %s", acadErrorStatusText(es));  pRecord->close();  pTable->close();  }  AcGePoint2d pt = iStyle.extents(str, Adesk::kFalse, _tcslen(str),  Adesk::kTrue);  // get the width  acutPrintf("/nText string width is: /t.", pt.x);       // get the height too       acutPrintf("/nText string height is: /t.", pt.y);  }  //declare the following inline function in a header file  inline void ARXOK(Acad::ErrorStatus what) throw(Acad::ErrorStatus)  {      if (what!=Acad::eOk)       throw what;  }  Note: You have to strip some format characters off an AcDbMText text string  which is some extra work. Otherwise, the width calculation above will not be  accurate.  To make the dimension meaningful for OUTLINETEXTMETRIC, you'll need to  translate the point from WCS to the screen pixel size using  acedCoordFromWorldToPixel().  Disclaimer  This information is derived from a response to a specific question sent to the Developer Consulting Group at Autodesk, and thus given its nature, is subject to change without notice. The information is provided to you on an "as is" basis, and you may use it only at your own risk. Autodesk is not responsible for its quality, nor shall it be liable for any damage or loss caused by your use of this information.  Top