mypaintview.cpp

一个用VC++编写的绘图工具

// MyPaintView.cpp : implementation of the CMyPaintView class
//

#include "stdafx.h"
#include "MyPaint.h"

#include "MyPaintDoc.h"
#include "MyPaintView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CMyPaintView

IMPLEMENT_DYNCREATE(CMyPaintView, CScrollView)

BEGIN_MESSAGE_MAP(CMyPaintView, CScrollView)
	//{{AFX_MSG_MAP(CMyPaintView)
	ON_WM_LBUTTONDOWN()
	ON_WM_MOUSEMOVE()
	ON_WM_RBUTTONDOWN()
	ON_COMMAND(ID_OPTION_PICK, OnOptionPick)
	ON_UPDATE_COMMAND_UI(ID_OPTION_PICK, OnUpdateOptionPick)
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CScrollView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CScrollView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CScrollView::OnFilePrintPreview)

	ON_COMMAND_RANGE(ID_CREATE_LINE, ID_CREATE_ARC, OnCreateEntity)
	ON_UPDATE_COMMAND_UI_RANGE(ID_CREATE_LINE, ID_CREATE_ARC, OnUpdateCreateCommand)

	ON_COMMAND_RANGE(ID_OPTION_MOVE, ID_OPTION_MIRROR, OnModifyEntity)
	ON_UPDATE_COMMAND_UI_RANGE(ID_OPTION_MOVE, ID_OPTION_MIRROR, OnUpdateModifyCommand)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyPaintView construction/destruction

CMyPaintView::CMyPaintView()
{
	// 
	m_pCmd = NULL;
	g_pView = this;

	// 
	m_dOrgX = m_dOrgY = 0.;
	scale = 1.;

}

CMyPaintView::~CMyPaintView()
{
}

BOOL CMyPaintView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CScrollView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CMyPaintView drawing

void CMyPaintView::OnDraw(CDC* pDC)
{
	g_nRefresh ++; // 刷新次数加1

	CMyPaintDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);

	pDoc->Draw(pDC);
}

void CMyPaintView::OnInitialUpdate()
{
	CScrollView::OnInitialUpdate();

	CSize sizeTotal;
	// TODO: calculate the total size of this view
	sizeTotal.cx = 800;
	sizeTotal.cy = 600;
	SetScrollSizes(MM_TEXT, sizeTotal);
}

/////////////////////////////////////////////////////////////////////////////
// CMyPaintView printing

BOOL CMyPaintView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CMyPaintView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CMyPaintView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}


void CMyPaintView::WorldtoScreen(const Position& pos, CPoint& screenPt)
{
	// 获取当前客户区的大小
	CRect rect ;
	GetClientRect(&rect) ;

	// 将屏幕原点设置为客户区的中心
	int	nSOrgX = (rect.left + rect.right)  / 2 ;
	int nSOrgY = -(rect.top + rect.bottom) / 2 ;

	// 计算屏幕坐标值
	screenPt.x = (int)((pos.x - m_dOrgX) / scale + nSOrgX) ;
	screenPt.y = (int)((pos.y - m_dOrgY) / scale + nSOrgY) ;
}

void CMyPaintView::ScreentoWorld(const CPoint& pt, Position& pos)
{
	CPoint screenPt = pt;
	CDC* pDC = GetDC();
	pDC->SetMapMode(MM_LOENGLISH); 
	pDC->DPtoLP(&screenPt);
	ReleaseDC(pDC);	

	// 获取当前客户区的大小
	CRect rect ;
	GetClientRect(&rect) ;

	// 将屏幕原点设置为客户区的中心
	int	nSOrgX = (rect.left + rect.right)  / 2 ;
	int nSOrgY = -(rect.top + rect.bottom) / 2 ;

	// 计算世界坐标值
	pos.x = (screenPt.x - nSOrgX ) * scale + m_dOrgX;
	pos.y = (screenPt.y - nSOrgY ) * scale + m_dOrgY;
}

double CMyPaintView::GetScale()
{
	return scale;
}

/////////////////////////////////////////////////////////////////////////////
// CMyPaintView diagnostics

#ifdef _DEBUG
void CMyPaintView::AssertValid() const
{
	CScrollView::AssertValid();
}

void CMyPaintView::Dump(CDumpContext& dc) const
{
	CScrollView::Dump(dc);
}

CMyPaintDoc* CMyPaintView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CMyPaintDoc)));
	return (CMyPaintDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CMyPaintView message handlers


void CMyPaintView::OnCreateEntity(int m_nID)
{
	if( m_pCmd ){ 
		m_pCmd->Cancel();
		delete m_pCmd ;
		m_pCmd = NULL; 
	}

	// 下面根据不同的菜单命令创建不同的命令对象
	switch(m_nID)
	{
		case ID_CREATE_LINE: // 直线
		{
			m_pCmd = new CCreateLine();
			break;
		}
		case ID_CREATE_RECTANGLE: // 矩形
		{
			m_pCmd = new CCreateRect();
			break;
		}
		case ID_CREATE_ARC: // 圆弧
		{
			m_pCmd = new CCreateArc();
			break;
		}
	}
}

void CMyPaintView::OnUpdateCreateCommand(CCmdUI* pCmdUI)
{
	int flag = 0 ;
	switch(pCmdUI->m_nID)
	{
		case ID_CREATE_LINE:
		{
			if( (m_pCmd != NULL ) && (m_pCmd->GetType() == ctCreateLine) )
				flag = 1;
			break;
		}
		case ID_CREATE_RECTANGLE:
		{
			if( (m_pCmd != NULL && m_pCmd->GetType() == ctCreateRectangle) )
				flag = 1;
			break;
		}
		case ID_CREATE_ARC:
		{
			if( (m_pCmd != NULL && m_pCmd->GetType() == ctCreateArc) )
				flag = 1;
			break;
		}
		default:
			break;
	}
	pCmdUI->SetCheck(flag);
}

void CMyPaintView::OnModifyEntity(int m_nID)
{
	CMyPaintDoc* pDoc = GetDocument();
	ASSERT(pDoc) ;

	if( m_pCmd ){ 
		m_pCmd->Cancel();
		delete m_pCmd ;
		m_pCmd = NULL; 
	}

	// 下面根据不同的菜单命令创建不同的命令对象
	switch(m_nID)
	{
		case ID_OPTION_MOVE:	// 平移
		{
			m_pCmd = new CMove();
			break;
		}
		case ID_OPTION_MIRROR: // 镜像
		{
			m_pCmd = new CRotate();
			break;
		}
		default:
			break;
	}
}

void CMyPaintView::OnUpdateModifyCommand(CCmdUI* pCmdUI)
{
	CMyPaintDoc* pDoc = GetDocument();
	ASSERT(pDoc) ;

	// 判断是否有实体图元被选中
	if(pDoc->m_selectArray.GetSize() == 0)
	{
		pCmdUI->Enable(FALSE);		
		return;
	}

	int flag = 0 ;
	switch(pCmdUI->m_nID)
	{
		case ID_OPTION_MOVE:
		{
			if( (m_pCmd != NULL && m_pCmd->GetType() == ctMove) )
				flag = 1;
			break;
		}
		case ID_OPTION_MIRROR:
		{
			if( (m_pCmd != NULL && m_pCmd->GetType() == ctRotate) )
				flag = 1;
			break;
		}
		default:
			break;
	}
	pCmdUI->SetCheck(flag);

}

void CMyPaintView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CMyPaintDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);

	Position pos;
	ScreentoWorld(point, pos); // 将设备坐标转换为世界坐标

	if(m_pCmd)
		m_pCmd->OnLButtonDown(nFlags, pos);
	else
		pDoc->OnLButtonDown(nFlags, pos);
	
	CView::OnLButtonDown(nFlags, point);
}

void CMyPaintView::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CMyPaintDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);

	Position pos;
	ScreentoWorld(point, pos);// 将设备坐标转换为世界坐标

	//获得状态条的指针
	CStatusBar* pStatus=(CStatusBar*)
		AfxGetApp()->m_pMainWnd->GetDescendantWindow(ID_VIEW_STATUS_BAR);
	if(pStatus)
	{
		CString str;
		str.Format("(%d,%d)",point.x, point.y);
		//在状态条的第二个窗格中输出当前鼠标的位置
		pStatus->SetPaneText(1,str);
	}
	if(m_pCmd)
		m_pCmd->OnMouseMove(nFlags, pos);
	else
		pDoc->OnMouseMove(nFlags, pos);

	CView::OnMouseMove(nFlags, point);
}

void CMyPaintView::OnRButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	Position pos;
	ScreentoWorld(point, pos);// 将设备坐标转换为世界坐标

	if(m_pCmd)
		m_pCmd->OnRButtonDown(nFlags, pos);

	CView::OnRButtonDown(nFlags, point);
}

void CMyPaintView::OnOptionPick() 
{
	if(m_pCmd){
		delete m_pCmd;
		m_pCmd = NULL;
	}
	
}

void CMyPaintView::OnUpdateOptionPick(CCmdUI* pCmdUI) 
{
	pCmdUI->SetCheck(m_pCmd == NULL ? 1 : 0) ;
	
}