Create DONUT like AutoCAD's donut

AutoCAD에서의 Donut과 유사하게 MSTN J에서 Donut을 만드는 함수입니다.

함수 분석은 그리 어렵지 않구요.
간단히 설명하자면 두개의 Ellipse를 생성한 다음에 큰 Ellipse에서 작은 Ellipse을 뺀 나머지 부분을 생성한 후 저장하면 됩니다.

//! get difference pattern between two patterns
mdlElmdscr_differenceShapes(&patternEdPP, NULL, OutpatternEdPP, InpatternEdPP , 0);

자 그럼 코드를 볼까요...

/**
@brief create donut
@author HumKyung.Baek
@date ????.??.??
@return boolean
*/
Private boolean Draw_Donut(floatfInsideDia, floatfOutsideDia, Dpoint3d *ptCenter, intnColor, intnLayer) 
{ 
	MSElementUnion newElement, newInElement, newOutElement; 
	inti, stat; 
	intnFillmode = 1; 
	intnWeight, nStyle; 
	MSElementDescr *OutpatternEdPP = NULL, *InpatternEdPP = NULL, *patternEdPP = NULL; 
 
	doubleunitVal = tcb->uorpersub; 
 
	ptCenter->x = ptCenter->x * unitVal; 
	ptCenter->y = ptCenter->y * unitVal; 
	ptCenter->z = ptCenter->z * unitVal; 
 
	stat = mdlEllipse_create(&newOutElement, NULL, ptCenter, fOutsideDia*unitVal, fOutsideDia*unitVal, NULL, nFillmode); 
	if(stat != SUCCESS) 
	{ 
		PrintError("Error creating graphic element!"); 
		return FALSE; 
	} 
 
	mdlElement_setSymbology(&newOutElement, &nColor, NULL, NULL); 
	mdlElement_setProperties(&newOutElement , &(nLayer) , NULL, NULL, NULL, NULL, NULL, NULL, NULL);
	if(fInsideDia > 0.0) 
	{ 
		stat = mdlEllipse_create(&newInElement, NULL, ptCenter, fInsideDia*unitVal, fInsideDia*unitVal, NULL, nFillmode);
		if(stat != SUCCESS) 
		{ 
			PrintError("Error creating graphic element!"); 
			returnFALSE; 
		} 
 
		mdlElement_setSymbology(&newInElement, &nColor, NULL, NULL); 
		mdlElement_setProperties(&newInElement , &(nLayer) , NULL, NULL, NULL, NULL, NULL, NULL, NULL); 
 
		mdlElement_display(&newInElement, NORMALDRAW); 
 
		mdlElmdscr_new (&OutpatternEdPP, NULL, &newOutElement); 
		mdlElmdscr_new (&InpatternEdPP, NULL, &newInElement); 
 
		//! get difference pattern between two patterns
		mdlElmdscr_differenceShapes(&patternEdPP, NULL, OutpatternEdPP, InpatternEdPP , 0); 
		mdlElmdscr_display(patternEdPP, 0, NORMALDRAW); 
		mdlElmdscr_add (patternEdPP); 
 
		//! free mstn element descriptions
		mdlElmdscr_freeAll(&patternEdPP); 
		mdlElmdscr_freeAll(&InpatternEdPP); 
		mdlElmdscr_freeAll(&OutpatternEdPP); 
	} 
	else
	{ 
		mdlElement_display(&newOutElement, NORMALDRAW); 
		stat = mdlElement_add(&newOutElement); 
		if(stat == 0) 
		{ 
			PrintError("Error adding graphic element!"); 
		return FALSE; 
		} 
	} 
 
	return TRUE; 
} 

아래는 샘플 output 이미지입니다.