(7)一步一步开发一个CAD之对实体集及选择集进行删除，捡选

上一步开发了对实体和选择集进行操作的类后，再实现捡选，删除就很简单了

删除图形只要把图形从选择集中删掉就可以了

(1)选择

class CSelect : public CComand
{
public:
 CSelect();
 virtual ~CSelect();
public:
 void OnLButtonDown(UINT nFlags,  CPosition pos);
    void OnMouseMove(UINT nFlags,  CPosition pos);
private:
 CHandleCG* m_hand;
 
};

CSelect::CSelect()
{
 m_hand = new CHandleCG(&g_pDoc->m_solid, &g_pDoc->m_select);
}

void CSelect::OnLButtonDown(UINT nFlags,  CPosition pos)
{
    m_hand->AddSelect();
}

void CSelect::OnMouseMove(UINT nFlags,  CPosition pos)
{
    CDC *pDC = g_pView->GetDC();
    float dis = PICK_RADIU * ( g_pView->m_scale );
 m_hand->DrawSelect(pDC, pos, dis, Normal, Select);
}

CSelect::~CSelect()
{

 delete m_hand;//
}

(2)取消选择

class CUnSelect : public CComand
{
public:
 CUnSelect();
 virtual ~CUnSelect();
public:
 void OnLButtonDown(UINT nFlags,  CPosition pos);
    void OnMouseMove(UINT nFlags,  CPosition pos);
private:
 CHandleCG* m_hand;
 
};

CUnSelect::CUnSelect()
{
 m_hand = new CHandleCG(&g_pDoc->m_select, &g_pDoc->m_solid);
}

void CUnSelect::OnLButtonDown(UINT nFlags,  CPosition pos)
{
    m_hand->AddSelect();
}

void CUnSelect::OnMouseMove(UINT nFlags,  CPosition pos)
{
    CDC *pDC = g_pView->GetDC();
    float dis = PICK_RADIU * ( g_pView->m_scale );
 m_hand->DrawSelect(pDC, pos, dis, Select, Normal);
 g_pView->ReleaseDC(pDC);
}

CUnSelect::~CUnSelect()
{

 delete m_hand;//
}

(3)删除

class CDelete : public CComand
{
public:
 CDelete();
 virtual ~CDelete();
public:
 void OnLButtonDown(UINT nFlags,  CPosition pos);
    void OnMouseMove(UINT nFlags,  CPosition pos);
private:
 CHandleCG* m_hand;
 
};

CDelete::CDelete()
{
 m_hand = new CHandleCG(&g_pDoc->m_select, &g_pDoc->m_solid);
}
void CDelete::OnLButtonDown(UINT nFlags,  CPosition pos)//删除实体并重画
{  
 CDC *pDC = g_pView->GetDC();
    m_hand->DeleteSolid(pDC);
 g_pView->ReleaseDC(pDC);
}

void CDelete::OnMouseMove(UINT nFlags,  CPosition pos)//移动监测选中的实体
{
    CDC *pDC = g_pView->GetDC();
    float dis = PICK_RADIU * ( g_pView->m_scale );
 m_hand->DrawSelect(pDC, pos, dis, Select, Normal);
 g_pView->ReleaseDC(pDC);
}

CDelete::~CDelete()
{

 delete m_hand;//
}