singledrawview.cpp

使用MFC编写的实现绘图功能的程序源代码

// SingleDrawView.cpp : implementation of the CSingleDrawView class
//

#include "stdafx.h"
#include "SingleDraw.h"

#include "SingleDrawDoc.h"
#include "SingleDrawView.h"
#include "PenSetting.h"

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

/////////////////////////////////////////////////////////////////////////////
// CSingleDrawView

IMPLEMENT_DYNCREATE(CSingleDrawView, CScrollView)

BEGIN_MESSAGE_MAP(CSingleDrawView, CScrollView)
	//{{AFX_MSG_MAP(CSingleDrawView)
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_WM_MOUSEMOVE()
	ON_COMMAND(ID_PEN_SETTING, OnPenSetting)
	//}}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)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CSingleDrawView construction/destruction

CSingleDrawView::CSingleDrawView()
{
	// TODO: add construction code here

	m_colorRef = RGB(0, 0, 0);
	m_nPenWidth = 1;
	m_uPenStyle = PS_SOLID;


	// Create default pen
	m_pCurPen = new CPen;
	m_pCurPen->CreatePen(PS_SOLID, 1, RGB(0, 0, 0));
}

CSingleDrawView::~CSingleDrawView()
{
	if(m_pCurPen != NULL)		delete m_pCurPen;
}

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

	return CScrollView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CSingleDrawView drawing

void CSingleDrawView::OnDraw(CDC* pDC)
{
	CSingleDrawDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here

	pDC->SetTextColor(RGB(0, 0, 255));
	
	CRect rt;
	GetClientRect(&rt);

	pDC->SetTextCharacterExtra(5);
	pDC->TextOut(rt.right/2-10, rt.top, "Hello!");

	POSITION pos = pDoc->m_strokeList.GetHeadPosition();

	while(pos != NULL)
	{
		pDoc->m_strokeList.GetAt(pos)->DrawStroke(pDC);
		pDoc->m_strokeList.GetNext(pos);
	}
}

/////////////////////////////////////////////////////////////////////////////
// CSingleDrawView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CSingleDrawView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CSingleDrawView message handlers

void CSingleDrawView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default

	// set point
	CClientDC dc(this);
	OnPrepareDC(&dc);
	dc.DPtoLP(&point);

	m_pointPrev = point;
	SetCapture();

	CPen *pOldPen = dc.SelectObject(m_pCurPen);

	dc.MoveTo(m_pointPrev);	
	dc.LineTo(point);

	m_pCurStroke = new CStroke;
	m_pCurStroke->SetPen(PS_SOLID, m_nPenWidth, m_colorRef);

	m_pCurStroke->m_pointArray.Add(point);

	dc.SelectObject(pOldPen);
	
	CScrollView::OnLButtonDown(nFlags, point);
}

void CSingleDrawView::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if(GetCapture() == this)
	{
		CClientDC dc(this);
		OnPrepareDC(&dc);
		dc.DPtoLP(&point);

		m_pointPrev = point;

		m_pCurStroke->m_pointArray.Add(point);

		GetDocument()->m_strokeList.AddTail(m_pCurStroke);
		
		ReleaseCapture();
	}
	CScrollView::OnLButtonUp(nFlags, point);
}

void CSingleDrawView::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	
	if(GetCapture() == this)
	{
	// very important 
	// prepare DC and convert DC point into Logic point
		CClientDC dc(this);
		OnPrepareDC(&dc);
		dc.DPtoLP(&point);

		CPen *pOldPen = dc.SelectObject(m_pCurPen);

		dc.MoveTo(m_pointPrev);	
		dc.LineTo(point);
		
		m_pCurStroke->m_pointArray.Add(point);
		m_pointPrev = point;

		dc.SelectObject(pOldPen);
		
		// the document have been changed.
		GetDocument()->SetModifiedFlag();
	}
	CScrollView::OnMouseMove(nFlags, point);
}


void CSingleDrawView::OnPenSetting() 
{
	// TODO: Add your command handler code here
	CPenSetting dlg;
	dlg.DoModal();
}

void CSingleDrawView::OnInitialUpdate() 
{
	CScrollView::OnInitialUpdate();
	
	// TODO: Add your specialized code here and/or call the base class
	SetScrollSizes(MM_TEXT, GetDocument()->GetDocSize());
}

void CSingleDrawView::SetPen(UINT penStyle, int penWidth, COLORREF rgb)
{
	m_uPenStyle = penStyle;
	m_nPenWidth = penWidth;
	m_colorRef  = rgb;

	if(m_pCurPen != NULL)	delete m_pCurPen;

	m_pCurPen = new CPen(penStyle, penWidth, rgb);

	if(m_pCurPen == NULL)	AfxMessageBox("Create new pen error!");
}