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Steps:

1.Create a new class CAnchorShape which uses CFODrawPortsShape as base class, this work can be done with ClassWizard.exe that shipped with E-XD++.

2.Modify the following method of CExtDataModel:

// Call before create shape new shape.
virtual void DoInitCreateShape(CFODrawShape *pShape);

3. Add new methods to CAnchorTestView for mouse drawing:

void CAnchorTestView::OnDrawAnchor() 
{
	// TODO: Add your command handler code here
	m_drawshape = MY_ANCHOR_SHAPE;
	SetCurrentDrawingCursor(IDC_FO_DRAW_COMP_CURSOR);
	m_action_state = State_DrawRect;
	m_bUpRightMode = FALSE;
}

void CAnchorTestView::OnUpdateDrawAnchor(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here
	pCmdUI->SetCheck(m_drawshape == MY_ANCHOR_SHAPE);
}

And

Steps:

1.Create a new class CMyThreePointEllipseShape which uses CFOPAdvAnchorShapeas base class, this work can be done with ClassWizard.exe that shipped with E-XD++.

2.Modify the following method of CExtDataModel:

// Call before create shape new shape.
virtual void DoInitCreateShape(CFODrawShape *pShape);

case My_THREEPOINT_ELLIPSE:
{
pReturn = new CMyThreePointEllipseShape;
pReturn->AddRef();
pReturn->Create(rc,"");
pReturn->UpdatePosition();
strCaption = GetUniqueCaption(pReturn->GetType());
strName = GetUniqueName(pReturn->GetType());
pReturn->SetObjectCaption(strCaption);
pReturn->SetObjectName(strName);
}
break;

3. Add new methods to CAnchorTestView for mouse drawing:

void CAnchorTestView::OnDrawThreeellipse() 
{
	// TODO: Add your command handler code here
	m_drawshape = My_THREEPOINT_ELLIPSE;
	SetCurrentDrawingCursor(IDC_CURSOR_ELLIPSE);
	m_action_state = State_DrawDimLine;
	m_bUpRightMode = FALSE;
}

void CAnchorTestView::OnUpdateDrawThreeellipse(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here
	BOOL bDesign = GetCurrentModel()->IsDesignMode();
	pCmdUI->Enable(bDesign);

	pCmdUI->SetCheck(m_drawshape == My_THREEPOINT_ELLIPSE);
}

4. Override the following method of CAnchorTestView for handle drawing:

// Draw Track Dimension Line
virtual void OnDrawTrackDimLine(CPoint point);