[每日一码] 计算文字在AutoCAD中所占的长度,和字体样式,字高
在AutoCAD中,经常需要在一个创建一个文字实体之前,先要计算出它根据字体样式,字高和宽高比在图纸中所占的宽度,比如在一大段文字排版的时候很有用。于是整理封装了一下这个函数:double YgxGeometry::TextLength(LPCSTR str, double h, double wr)
{
if(strlen(str) == 0) return(0.);
struct resbuf *list = NULL;
ads采用point bl,rt;
char styleName = {0};
YgxAu()->CurrTextStyle(styleName);
list = acutBuildList(RTDXF0,"text",1,str,7,styleName,40,h,41,wr,51,0.,NULL);
acedTextBox(list,bl,rt);
acutRelRb(list);
return fabs(bl-rt);
}
其中YgxAu()->CurrTextStyle(styleName)是得到当前字体样式,函数如下:
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void YgxAcadUtil::CurrTextStyle(char styleName[])
{
AcDbObjectId Id = CurrDB()->textstyle();
AcDbTextStyleTableRecord* pStyleRecord;
if(acdbOpenObject((AcDbObject *&)pStyleRecord, Id, AcDb::kForRead) == Acad::eOk) {
const char *name;
pStyleRecord->getName(name);
strcpy(styleName, name);
pStyleRecord->close();
}
else strcpy(styleName, "STANDARD");
}
其中CurrDB()就是得到当前数据库,acdbHostApplicationServices()->workingDatabase();
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