drawview.cpp

来自「VC++ MFC 教程源码」· C++ 代码 · 共 378 行

// DrawView.cpp : implementation of the CDrawView class
//

#include "stdafx.h"
#include "Draw.h"

#include "DrawDoc.h"
#include "DrawView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CDrawView

IMPLEMENT_DYNCREATE(CDrawView, CView)

BEGIN_MESSAGE_MAP(CDrawView, CView)
	//{{AFX_MSG_MAP(CDrawView)
	ON_WM_CREATE()
	ON_COMMAND(ID_DRAW_LINECOLOR, OnDrawLinecolor)
	ON_COMMAND(ID_DRAW_FILLCOLOR, OnDrawFillcolor)
	ON_WM_LBUTTONUP()
	ON_WM_MOUSEMOVE()
	ON_WM_LBUTTONDOWN()
	ON_WM_SETCURSOR()
	ON_WM_ERASEBKGND()
	//}}AFX_MSG_MAP
	ON_COMMAND_RANGE(ID_DRAW_LINE,ID_DRAW_FILL, OnSelectDrawType)
	ON_UPDATE_COMMAND_UI_RANGE(ID_DRAW_LINE,ID_DRAW_FILL, OnUpdateSelectDrawType)

	ON_COMMAND_RANGE(ID_DRAW_LINEWIDTH_ONE,ID_DRAW_LINEWIDTH_FIVE, OnDrawLineWidth)
	ON_UPDATE_COMMAND_UI_RANGE(ID_DRAW_LINEWIDTH_ONE,ID_DRAW_LINEWIDTH_FIVE,OnUpdateDrawLineWidth)
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDrawView construction/destruction

CDrawView::CDrawView()
{
	// TODO: add construction code here
	m_pMemDC = new CDC;
	m_pBitmap = new CBitmap;
	m_nDrawType = -1;
	m_nLineWidth = 1;
	m_cLineColor = RGB(0,0,0);
	m_cFillColor = RGB(0,0,255);
	m_bDrawing = false;

}

CDrawView::~CDrawView()
{
	delete m_pMemDC;
	delete m_pBitmap;
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CDrawView drawing

void CDrawView::OnDraw(CDC* pDC)
{
	CDrawDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	CBitmap * pOldBitmap = m_pMemDC->SelectObject(m_pBitmap);

	pDC->BitBlt(0,0,m_nMaxX, m_nMaxY, m_pMemDC, 0,0, SRCCOPY);//在指定的设备商输出内存中的位图

	m_pMemDC->SelectObject(pOldBitmap);
}

/////////////////////////////////////////////////////////////////////////////
// CDrawView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CDrawView diagnostics

#ifdef _DEBUG
void CDrawView::AssertValid() const
{
	CView::AssertValid();
}

void CDrawView::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

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

/////////////////////////////////////////////////////////////////////////////
// CDrawView message handlers

int CDrawView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CView::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	// TODO: Add your specialized creation code here
	m_nMaxX = GetSystemMetrics(SM_CXSCREEN);	//得到屏幕的宽和高
	m_nMaxY = GetSystemMetrics(SM_CYSCREEN);

	CDC * pDC = GetDC(); //获取设备环境的句柄
	m_pMemDC->CreateCompatibleDC(pDC);	//创建兼容DC
	m_pBitmap->CreateCompatibleBitmap(pDC, m_nMaxX, m_nMaxY);	//内存中绘制，然后送往屏幕DC，实现平滑图象刷新。   
  
	
	CBitmap * pOldBitmap = m_pMemDC->SelectObject(m_pBitmap);	//将位图选入设备描述表

	CBrush brush;
	brush.CreateStockObject(WHITE_BRUSH);	//创建画刷

	CRect rect(-1,-1,m_nMaxX, m_nMaxY);
	m_pMemDC->FillRect(rect,&brush);		//填充矩形，此处是否为整个屏幕

	m_pMemDC->SelectObject(pOldBitmap);
	ReleaseDC(pDC); //释放设备环境的句柄
	
	return 0;
}

void CDrawView::OnSelectDrawType(UINT nID)
{
	m_nDrawType = nID - ID_DRAW_LINE;
}

void CDrawView::OnUpdateSelectDrawType(CCmdUI * pCmdUI)
{
	int nID = pCmdUI->m_nID - ID_DRAW_LINE;
	if(nID == m_nDrawType)
		pCmdUI->SetCheck(true);
	else
		pCmdUI->SetCheck(false);
}

void CDrawView::OnDrawLineWidth(UINT nID)
{
	m_nLineWidth = nID - ID_DRAW_LINEWIDTH_ONE + 1;
}

void CDrawView::OnUpdateDrawLineWidth(CCmdUI * pCmdUI) 
{
	int nID = pCmdUI->m_nID - ID_DRAW_LINEWIDTH_ONE + 1;
	if(nID == m_nLineWidth)
		pCmdUI->SetCheck(true);
	else
		pCmdUI->SetCheck(false);
}

void CDrawView::OnDrawLinecolor() 
{
	// TODO: Add your command handler code here
	CColorDialog dlg;
	dlg.m_cc.Flags |= CC_PREVENTFULLOPEN | CC_RGBINIT;
	dlg.m_cc.rgbResult = m_cLineColor;
	if(dlg.DoModal() == IDOK)
	{
		m_cLineColor = dlg.GetColor();
	}
	
}

void CDrawView::OnDrawFillcolor() 
{
	// TODO: Add your command handler code here
	CColorDialog dlg;
	dlg.m_cc.Flags |= CC_PREVENTFULLOPEN | CC_RGBINIT;
	dlg.m_cc.rgbResult = m_cFillColor;
	if(dlg.DoModal() == IDOK)
	{
		m_cFillColor = dlg.GetColor();
	}
	
}

void CDrawView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if(m_bDrawing)
		return;
	SetCapture();		//捕获鼠标信息
	m_bDrawing = true;  //将绘图设为真
	m_ptStart = point;
	m_ptOld  = point;
	if(m_nDrawType == 3) //添加“填充”菜单相应
	{
		CBrush * pOldBrush;
		CBitmap * pOldBitmap;

		CBrush brFill;
		brFill.CreateSolidBrush(m_cFillColor);//利用填充颜色创建固体画刷
		pOldBrush = m_pMemDC->SelectObject(&brFill);
		pOldBitmap = m_pMemDC->SelectObject(m_pBitmap);

		m_pMemDC->ExtFloodFill(point.x,point.y, m_pMemDC->GetPixel(point), FLOODFILLSURFACE);
		//该函数将使用当前刷子填充显示表面区域
		// FLOODFILLBORDER：表示填充区域是由crColor参数指定的颜色包围起来的部分。这种形式与FloodFill函数执行的填充类型一样。
		// nXSTart：指定要开始填充处的逻辑X轴坐标。
        //nYStart：指定要开始填充处的逻辑Y轴坐标。

		Invalidate(false);
		m_pMemDC->SelectObject(pOldBrush);
		m_pMemDC->SelectObject(pOldBitmap);
		m_bDrawing = false;
	}
	
//	CView::OnLButtonDown(nFlags, point);
}

void CDrawView::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if(m_bDrawing)
	{
		CDC * pDC = GetDC();
		CBitmap * pOldBitmap = m_pMemDC->SelectObject(m_pBitmap);
		CPen pen;
		pen.CreatePen(PS_SOLID, m_nLineWidth, m_cLineColor);
		CPen * pOldPen = pDC->SelectObject(&pen);

		CBrush * pOldBrush = (CBrush *) pDC->SelectStockObject(NULL_BRUSH);

	   CRect rectOld(m_ptStart, m_ptOld);

		rectOld.NormalizeRect();

	   rectOld.InflateRect(m_nLineWidth, m_nLineWidth);

		pDC->BitBlt(rectOld.left, rectOld.top, rectOld.Width(), rectOld.Height(),m_pMemDC, rectOld.left, rectOld.top, SRCCOPY);
		
	    CRect rectNew(m_ptStart,point);

		switch(m_nDrawType)
		{
		case 0:
			pDC->MoveTo(m_ptStart);
			pDC->LineTo(point);
			break;
		case 1:
			pDC->Rectangle(rectNew);
			break;
		case 2:
			pDC->Ellipse(rectNew);
			break;
		default:
			break;
		}

		m_pMemDC->SelectObject(pOldBitmap);
		m_pMemDC->SelectObject(pOldPen);
		m_pMemDC->SelectObject(pOldBrush);

		ReleaseDC(pDC);

		m_ptOld = point;
	}

	
//	CView::OnMouseMove(nFlags, point);
}

void CDrawView::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if(m_bDrawing)
	{
		m_bDrawing = false;

		CBitmap * pOldBitmap = m_pMemDC->SelectObject(m_pBitmap);
		CPen pen;
		pen.CreatePen(PS_SOLID, m_nLineWidth, m_cLineColor);
		CPen * pOldPen = m_pMemDC->SelectObject(&pen);

		CBrush * pOldBrush = (CBrush *) m_pMemDC->SelectStockObject(NULL_BRUSH);


		CRect rectNew(m_ptStart,point);

		switch(m_nDrawType)
		{
		case 0:
			m_pMemDC->MoveTo(m_ptStart);
			m_pMemDC->LineTo(point);
			break;
		case 1:
			m_pMemDC->Rectangle(rectNew);
			break;
		case 2:
			m_pMemDC->Ellipse(rectNew);
			break;
		default:
			break;
		}
		Invalidate(false);

		m_pMemDC->SelectObject(pOldBitmap);
		m_pMemDC->SelectObject(pOldPen);
		m_pMemDC->SelectObject(pOldBrush);

	}

    ReleaseCapture();	
//	CView::OnLButtonUp(nFlags, point);
}


BOOL CDrawView::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
{
	// TODO: Add your message handler code here and/or call default
	switch(m_nDrawType)
	{
	case 0:
	case 1:
	case 2:
		::SetCursor(AfxGetApp()->LoadStandardCursor(IDC_CROSS));
		break;
	case 3:
		::SetCursor(AfxGetApp()->LoadCursor(ID_CURSOR_FILL));
		break;
	default:
		::SetCursor(AfxGetApp()->LoadStandardCursor(IDC_ARROW));
		break;
	}

	return true;

//	return CView::OnSetCursor(pWnd, nHitTest, message);
}

BOOL CDrawView::OnEraseBkgnd(CDC* pDC) 
{
	// TODO: Add your message handler code here and/or call default
	CRect rect;
	GetClientRect(rect);
	CBrush *pBrush=CBrush::FromHandle((HBRUSH)GetStockObject(NULL_BRUSH));
	pDC->SelectObject(pBrush);
	pDC->FillRect(rect,pBrush);
	
	return CView::OnEraseBkgnd(pDC);
}