ObjectARX学习笔记(七)----RGB和CAD颜色索引之间的转换

朱雀 2022-09-20 15:02 377阅读 0赞

如何获得程序路径  
 struct resbuf rb;

char sTemp\[1024\],\*str;

ads\_getvar("acadprefix",&rb);

strcpy(sTemp,rb.resval.string);

acad\_free(rb.resval.rstring);

str=strchr(sTemp,';');

\*str='\\0';

str=strrchr(sTemp,'\\\\');

\*str='\\0';

上段程序中,sTemp中存储了安装CAD的目录  
AUTOCAD的系统变量存储了一些与安装有关的信息,虽然不多,在正常情况是够用的.与目录有关的主要有:

dwgprefix 当前dwg图形存储的目录

acadprefix   acad环境变量存储的目录

dwgname   当前dwg文件名

savefile 当前自动存储文件名

///从RGB得到cad颜色索引值  
int getNearestACI(COLORREF color)  
\{  
long acirgb, r,g,b;  
long mindst = 2147483647L;  
long dst = 0;  
int minndx = 0;  
long red=GetRValue(color);  
long green=GetGValue(color);  
long blue=GetBValue(color);  
for ( int i = 1; i < 255; i++ ) \{  
   acirgb = acdbGetRGB ( i );  
   r =GetRValue(acirgb);  
   g =GetGValue(acirgb);  
   b =GetBValue(acirgb);  
    
   dst = abs ( r-red) + abs ( g -green) + abs (b-blue);  
   if ( dst < mindst ) \{  
    minndx = i;  
    mindst = dst;  
   \}  
\}  
return minndx;  
  
\}

//功   能：从CAD的颜色得到RGB  
COLORREF CGlobal::GetColorFromIndex(int colorIndex)  
\{  
if(colorIndex < 0 || colorIndex > 255)  
\{  
   ads\_alert("传入的颜色号不在0~255之间!");  
   return 0;  
\}  
  
BYTE R, G, B;  
\#ifdef ARX\_2002\_dll  
R = lpszRGBData\[colorIndex\*3+0\];  
G = lpszRGBData\[colorIndex\*3+1\];  
B = lpszRGBData\[colorIndex\*3+2\];  
\#else  
long zhi = acdbGetRGB(colorIndex);  
WORD LOW = LOWORD(zhi);  
WORD HIG = HIWORD(zhi);  
R = LOBYTE(LOW);  
G = HIBYTE(LOW);  
B = LOBYTE(HIG);  
\#endif  
  
return RGB(R,G,B);

//return acdbGetRGB(nColor);  
\}

获取AcDbDimension里的属性信息  
AcDbEntity \*pEnt;  
AcDbObjectId id;  
AcGePoint3d ptPick;  
ads\_name eName;  
if (acedEntSel ("Select a dimension: " , eName, asDblArray (ptPick)) != RTNORM )  
return;  
acdbGetObjectId (id, eName);  
acdbOpenAcDbEntity (pEnt, id, AcDb::kForRead);  
//----- Get the id of the block table record which owns the text entity  
AcDbDimension \*pDim =AcDbDimension::cast (pEnt);  
if (pDim == NULL)  
\{  
pEnt->close ();  
return;  
\}

id =pDim->dimBlockId ();  
pDim->close ();  
AcDbBlockTableRecord \*pr;  
acdbOpenAcDbObject ((AcDbObject \*&) pr, id, AcDb::kForRead);  
//----- Iterating the block table record  
AcDbBlockTableRecordIterator \*pi;  
pr->newIterator (pi);  
while (!pi->done ())  
\{  
pi->getEntity (pEnt, AcDb::kForRead);  
if (pEnt->isKindOf (AcDbMText::desc ()))  
\{  
AcDbMText \*pt = (AcDbMText \*) pEnt;  
char \*s = pt->contents ();  
acutPrintf (s);  
delete s;  
\}  
pEnt->close();  
pi->step();  
\}  
pr->close();