printcontextview.cpp

进行拷屏打印

// PrintContextView.cpp : implementation of the CPrintContextView class
//

#include "stdafx.h"
#include "PrintContext.h"

#include "PrintContextDoc.h"
#include "PrintContextView.h"

//add down
#include "gl\gl.h"
#include "gl\glu.h"
#include "gl\glaux.h"
//add up

//add down
unsigned char threeto8[8] = 
{
	0, 0111>>1, 0222>>1, 0333>>1, 0444>>1, 0555>>1, 0666>>1, 0377
};

unsigned char twoto8[4] = 
{
	0, 0x55, 0xaa, 0xff
};

unsigned char oneto8[2] = 
{
	0, 255
};

static int defaultOverride[13] = 
{
	0, 3, 24, 27, 64, 67, 88, 173, 181, 236, 247, 164, 91
};

static PALETTEENTRY defaultPalEntry[20] = 
{
	{ 0,   0,   0,    0 },
	{ 0x80,0,   0,    0 },
	{ 0,   0x80,0,    0 },
	{ 0x80,0x80,0,    0 },
	{ 0,   0,   0x80, 0 },
	{ 0x80,0,   0x80, 0 },
	{ 0,   0x80,0x80, 0 },
	{ 0xC0,0xC0,0xC0, 0 },

	{ 192, 220, 192,  0 },
	{ 166, 202, 240,  0 },
	{ 255, 251, 240,  0 },
	{ 160, 160, 164,  0 },

	{ 0x80,0x80,0x80, 0 },
	{ 0xFF,0,   0,    0 },
	{ 0,   0xFF,0,    0 },
	{ 0xFF,0xFF,0,    0 },
	{ 0,   0,   0xFF, 0 },
	{ 0xFF,0,   0xFF, 0 },
	{ 0,   0xFF,0xFF, 0 },
	{ 0xFF,0xFF,0xFF, 0 }
};
//add up

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

/////////////////////////////////////////////////////////////////////////////
// CPrintContextView

IMPLEMENT_DYNCREATE(CPrintContextView, CView)

BEGIN_MESSAGE_MAP(CPrintContextView, CView)
	//{{AFX_MSG_MAP(CPrintContextView)
	ON_WM_CREATE()
	ON_WM_DESTROY()
	ON_WM_ERASEBKGND()
	ON_WM_SIZE()
	//}}AFX_MSG_MAP
	// 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)
	//add down
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, OnFilePrintPreview)
	//add up
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CPrintContextView construction/destruction

CPrintContextView::CPrintContextView()
{
	//add down
	m_pDC = NULL;
	m_pOldPalette = NULL;
	//add up
}

CPrintContextView::~CPrintContextView()
{
}

BOOL CPrintContextView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs
	//add down
	cs.style |= WS_CLIPSIBLINGS | WS_CLIPCHILDREN;
	//add up

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CPrintContextView drawing

void CPrintContextView::OnDraw(CDC* pDC)
{
	CPrintContextDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	//add down
	if (pDC->IsPrinting()) 
	{
		CRect rcDIB;
		GetClientRect(&rcDIB);

		rcDIB.right = rcDIB.Width();
		rcDIB.bottom = rcDIB.Height();

	
		// get size of printer page (in pixels)
		int cxPage = pDC->GetDeviceCaps(HORZRES);
		int cyPage = pDC->GetDeviceCaps(VERTRES);
		// get printer pixels per inch
		int cxInch = pDC->GetDeviceCaps(LOGPIXELSX);
		int cyInch = pDC->GetDeviceCaps(LOGPIXELSY);

		CRect rcDest;
		rcDest.top = rcDest.left = 0;
		rcDest.bottom = (int)(((double)rcDIB.Height() * cxPage * cyInch)
				/ ((double)rcDIB.Width() * cxInch));
		rcDest.right = cxPage;

		CapturedImage.OnDraw(pDC->m_hDC, &rcDest, &rcDIB);

	}
	else // not printer DC
	{
		DrawScene();
	}
	//add up
}

/////////////////////////////////////////////////////////////////////////////
// CPrintContextView printing

BOOL CPrintContextView::OnPreparePrinting(CPrintInfo* pInfo)
{
	if(!pInfo->m_bPreview)
	{
		CRect rcDIB;
		GetClientRect(&rcDIB);
		OnDraw(m_pDC);
		CapturedImage.Capture(m_pDC, rcDIB);
	}
	else
		m_PrintPreview = TRUE;

	BOOL rc = DoPreparePrinting(pInfo);
	
	return rc;
}

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

void CPrintContextView::OnEndPrinting(CDC* pDC, CPrintInfo* pInfo)
{
	CapturedImage.Release();
	m_PrintPreview =  FALSE;
	CView::OnEndPrinting(pDC, pInfo);
}

void CPrintContextView::OnFilePrintPreview()
{
	CRect rcDIB;
	GetClientRect(&rcDIB);
	OnDraw(m_pDC);
	CapturedImage.Capture(m_pDC, rcDIB);

	CView::OnFilePrintPreview();
}
/////////////////////////////////////////////////////////////////////////////
// CPrintContextView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CPrintContextView message handlers

int CPrintContextView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CView::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	//add down
	Init(); //初始化OpenGL
	//add up
	
	return 0;
}

void CPrintContextView::OnDestroy() 
{
	//add down
	HGLRC   hrc;

	hrc = ::wglGetCurrentContext();

	::wglMakeCurrent(NULL,  NULL);

	if (hrc)
		::wglDeleteContext(hrc);

	if (m_pDC)
		delete m_pDC;
	//add up

	CView::OnDestroy();
}

BOOL CPrintContextView::OnEraseBkgnd(CDC* pDC) 
{
	return TRUE;
}

void CPrintContextView::OnSize(UINT nType, int cx, int cy) 
{
	CView::OnSize(nType, cx, cy);
	
	//add down
	int w=cx;
	int h=cy;
	//避免除数为0
	if(h==0) h=1;

	//设置视口与窗口匹配
    glViewport(0, 0, (GLsizei) w, (GLsizei) h);
	//重新设置坐标系统
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
	//建立透视投影下的剪切体
    gluPerspective(45.0f, (GLdouble)cx/cy, 3.0f, 7.0f);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
	//add up
}

//add down
void CPrintContextView::Init()
{
	PIXELFORMATDESCRIPTOR pfd;
	int         n;
	HGLRC       hrc;

	m_pDC = new CClientDC(this);

	ASSERT(m_pDC != NULL);

	if (!bSetupPixelFormat())
		return;

	n = ::GetPixelFormat(m_pDC->GetSafeHdc());
	::DescribePixelFormat(m_pDC->GetSafeHdc(), n, sizeof(pfd), &pfd);

	hrc = wglCreateContext(m_pDC->GetSafeHdc());
	wglMakeCurrent(m_pDC->GetSafeHdc(), hrc);

    glClearDepth(1.0f);
    glEnable(GL_DEPTH_TEST);
}

BOOL CPrintContextView::bSetupPixelFormat()
{
	static PIXELFORMATDESCRIPTOR pfd =
	{
		sizeof(PIXELFORMATDESCRIPTOR),  // size of this pfd
		1,                              // version number
		PFD_DRAW_TO_WINDOW |            // support window
		  PFD_SUPPORT_OPENGL |          // support OpenGL
		  PFD_DOUBLEBUFFER,             // double buffered
		PFD_TYPE_RGBA,                  // RGBA type
		24,                             // 24-bit color depth
		0, 0, 0, 0, 0, 0,               // color bits ignored
		0,                              // no alpha buffer
		0,                              // shift bit ignored
		0,                              // no accumulation buffer
		0, 0, 0, 0,                     // accum bits ignored
		32,                             // 32-bit z-buffer
		0,                              // no stencil buffer
		0,                              // no auxiliary buffer
		PFD_MAIN_PLANE,                 // main layer
		0,                              // reserved
		0, 0, 0                         // layer masks ignored
	};
	int pixelformat;

	if ( (pixelformat = ChoosePixelFormat(m_pDC->GetSafeHdc(), &pfd)) == 0 )
	{
		MessageBox("ChoosePixelFormat failed");
		return FALSE;
	}

	if (SetPixelFormat(m_pDC->GetSafeHdc(), pixelformat, &pfd) == FALSE)
	{
		MessageBox("SetPixelFormat failed");
		return FALSE;
	}

	return TRUE;
}

void CPrintContextView::DrawScene(void)
{
	//将屏幕设置为白色
	glClearColor(1.0, 1.0, 1.0, 1.0f);
	//清除颜色缓冲区和深度缓冲区
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	glPushMatrix();

		glTranslatef(0.0, 0.0, -4.0);
		glRotatef(30.0, 1.0f, 0.0f, 0.0f);
		glRotatef(30.0, 0.0f, 1.0f, 0.0f);
		glRotatef(30.0, 0.0f, 0.0f, 1.0f);
		//设置绘制图形的颜色
		glColor3f(0.0f, 0.0f, 1.0f);

		//绘制四面体
		glBegin(GL_LINE_STRIP);
			glVertex3f(-0.5f, 0.0f, 0.5f);
			glVertex3f(0.5f, 0.0f, 0.5f);
			glVertex3f(0.0f, 0.5f, 0.0f);
		glEnd();
	
		glBegin(GL_LINE_STRIP);
			glVertex3f(0.5f, 0.0f, 0.5f);
	        glVertex3f(0.5f, 0.0f, -0.5f);
		    glVertex3f(0.0f, 0.5f, 0.0f);
		glEnd();

		glBegin(GL_LINE_STRIP);
			glVertex3f(0.5f, 0.0f, -0.5f);
			glVertex3f(-0.5f, 0.0f, -0.5f);
			glVertex3f(0.0f, 0.5f, 0.0f);
		glEnd();

		glBegin(GL_LINE_STRIP);
	        glVertex3f(-0.5f, 0.0f, -0.5f);
		    glVertex3f(-0.5f, 0.0f, 0.5f);
			glVertex3f(0.0f, 0.5f, 0.0f);
		glEnd();
		//绘制四面体

	glPopMatrix();

    glFinish();
    SwapBuffers(wglGetCurrentDC());
}

unsigned char CPrintContextView::ComponentFromIndex(int i, UINT nbits, UINT shift)
{
    unsigned char val;

    val = (unsigned char) (i >> shift);
    switch (nbits) 
	{

    case 1:
        val &= 0x1;
        return oneto8[val];
    case 2:
        val &= 0x3;
        return twoto8[val];
    case 3:
        val &= 0x7;
        return threeto8[val];

    default:
        return 0;
    }
}


void CPrintContextView::CreateRGBPalette()
{
	//检查是否需要调色板
    PIXELFORMATDESCRIPTOR pfd;
    LOGPALETTE *pPal;
    int n, i;
 
    n = ::GetPixelFormat(m_pDC->GetSafeHdc());
    ::DescribePixelFormat(m_pDC->GetSafeHdc(), n, sizeof(pfd), &pfd);

    if (pfd.dwFlags & PFD_NEED_PALETTE)
    {
        n = 1 << pfd.cColorBits;
		//分配一个逻辑调色板，使用颜色表信息填充它
        pPal = (PLOGPALETTE) new char[sizeof(LOGPALETTE) + n * sizeof(PALETTEENTRY)];

        ASSERT(pPal != NULL);

		//Win32版本
        pPal->palVersion = 0x300;
		//颜色表大小
        pPal->palNumEntries = n;

		//使用颜色索引填充所有的调色板条目
        for (i=0; i<n; i++)
        {
            pPal->palPalEntry[i].peRed =
                    ComponentFromIndex(i, pfd.cRedBits, pfd.cRedShift);
            pPal->palPalEntry[i].peGreen =
                    ComponentFromIndex(i, pfd.cGreenBits, pfd.cGreenShift);
            pPal->palPalEntry[i].peBlue =
                    ComponentFromIndex(i, pfd.cBlueBits, pfd.cBlueShift);
            pPal->palPalEntry[i].peFlags = 0;
        }

        /*改善调色板，使它包含缺省的GDI调色板*/
        if ((pfd.cColorBits == 8)                           &&
            (pfd.cRedBits   == 3) && (pfd.cRedShift   == 0) &&
            (pfd.cGreenBits == 3) && (pfd.cGreenShift == 3) &&
            (pfd.cBlueBits  == 2) && (pfd.cBlueShift  == 6)
           )
        {
			for (i = 1 ; i <= 12 ; i++)
                pPal->palPalEntry[defaultOverride[i]] = defaultPalEntry[i];
        }

		//删除现有的GDI调色板
        m_cPalette.CreatePalette(pPal);
        delete pPal;

        m_pOldPalette = m_pDC->SelectPalette(&m_cPalette, FALSE);
        m_pDC->RealizePalette();
    }
}
//add up