imageview.cpp

C:Documents and SettingsAdministrator桌面VC++多媒体特效制作百例CHAR14Font

// ImageView.cpp : implementation of the CImageView class
//

#include "stdafx.h"
#include "Image.h"

#include "ImageDoc.h"
#include "ImageView.h"

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

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

/////////////////////////////////////////////////////////////////////////////
// CImageView

IMPLEMENT_DYNCREATE(CImageView, CView)

BEGIN_MESSAGE_MAP(CImageView, CView)
	//{{AFX_MSG_MAP(CImageView)
	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)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CImageView construction/destruction

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

CImageView::~CImageView()
{
}

BOOL CImageView::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);
}

/////////////////////////////////////////////////////////////////////////////
// CImageView drawing

void CImageView::OnDraw(CDC* pDC)
{
	CImageDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	//add down
	DrawScene();
	//add up
}

/////////////////////////////////////////////////////////////////////////////
// CImageView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CImageView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CImageView message handlers

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

void CImageView::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 CImageView::OnEraseBkgnd(CDC* pDC) 
{
	// TODO: Add your message handler code here and/or call default
	
	return TRUE;
}

void CImageView::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,w,h);

	//重新设置坐标系统
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	
	//建立正交变换下的剪切体
	if(w<=h)
		gluOrtho2D(0.0,15.0,0.0,15.0*h/w);
	else
		gluOrtho2D(0.0,15.0*w/h,0.0,15.0);
	
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	//add up
}

//add down
void CImageView::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);

	//根据客户区的初始值定透视投影
	GetClientRect(&m_oldRect);
	glClearDepth(1.0f);
	glEnable(GL_DEPTH_TEST);

}

BOOL CImageView::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 CImageView::DrawScene(void)
{
	//设置清屏颜色为黑色
	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
	//清除颜色缓冲区和深度缓冲区
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	
	//必须要加的矩阵堆栈函数，和glPopMatrix()相对应。
	glPushMatrix();
	
	glTranslatef(4.0,8.0,0.0);
	glScalef(0.5,0.5,0.5);
	glBegin(GL_TRIANGLES);
		glColor3f(0.0,1.0,0.0);
		glVertex2f(2.0,3.0);
		glColor3f(0.0,0.0,1.0);
		glVertex2f(12.0,3.0);
		glColor3f(1.0,0.0,0.0);
		glVertex2f(7.0,12.0);
	glEnd();

	//拷贝原始图象
	glRasterPos2i(1,0);
	glCopyPixels(160,310,170,160,GL_COLOR);

	glPopMatrix();
	glFinish();
	SwapBuffers(wglGetCurrentDC());

}