viewportview.cpp

C:Documents and SettingsAdministrator桌面VC++多媒体特效制作百例CHAR09ViewPort

// ViewPortView.cpp : implementation of the CViewPortView class
//

#include "stdafx.h"
#include "ViewPort.h"

#include "ViewPortDoc.h"
#include "ViewPortView.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

/////////////////////////////////////////////////////////////////////////////
// CViewPortView

IMPLEMENT_DYNCREATE(CViewPortView, CView)

BEGIN_MESSAGE_MAP(CViewPortView, CView)
	//{{AFX_MSG_MAP(CViewPortView)
	ON_WM_CREATE()
	ON_WM_DESTROY()
	ON_WM_SIZE()
	ON_WM_ERASEBKGND()
	//}}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()

/////////////////////////////////////////////////////////////////////////////
// CViewPortView construction/destruction

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

CViewPortView::~CViewPortView()
{
}

BOOL CViewPortView::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);
}

/////////////////////////////////////////////////////////////////////////////
// CViewPortView drawing

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

/////////////////////////////////////////////////////////////////////////////
// CViewPortView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CViewPortView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CViewPortView message handlers

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

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

	hrc = ::wglGetCurrentContext();

	::wglMakeCurrent(NULL,  NULL);

	if (hrc)
		::wglDeleteContext(hrc);

	if (m_pDC)
		delete m_pDC;
	//add up
	
	CView::OnDestroy();
}


void CViewPortView::OnSize(UINT nType, int cx, int cy) 
{
	CView::OnSize(nType, cx, cy);
	
	//add down
	//设置投影剪切体随客户窗口的变化而变化
	if(cy > 0)
	{
		glViewport(0, 0, cx, cy);

		if((m_oldRect.right > cx) || (m_oldRect.bottom > cy))
			RedrawWindow();

		m_oldRect.right = cx;
		m_oldRect.bottom = cy;

		glMatrixMode(GL_PROJECTION);
		glLoadIdentity();
		gluPerspective(90.0f, (GLdouble)cx/cy, 1.0f, 200);
		glMatrixMode(GL_MODELVIEW);
	}
	//add up
}


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

//add down
void CViewPortView::Init()
{
	PIXELFORMATDESCRIPTOR pfd;
	int         n;
	HGLRC       hrc;
	GLfloat     fMaxObjSize, fAspect;
	GLfloat     fNearPlane, fFarPlane;

	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);

	if (m_oldRect.bottom)
		fAspect = (GLfloat)m_oldRect.right/m_oldRect.bottom;
	else    // 如果m_oldRect.bottom为0
		fAspect = 1.0f;
	fNearPlane = 1.0f;
	fFarPlane = 200;
	fMaxObjSize = 3.0f;

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(90.0f, fAspect, fNearPlane, fFarPlane);
	glMatrixMode(GL_MODELVIEW);
}

BOOL CViewPortView::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 CViewPortView::DrawScene(void)
{
	glPushMatrix();
	//使用黑色清屏
	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
	//使用当前定义的清屏颜色，清除颜色缓存和深度缓存
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	//设置视口的尺寸到窗口的大小
	glViewport(50,50,150,150);
	//重新设置坐标系统
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	//建立剪切体
	gluPerspective(90.0,1.0,1.0,200);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	//保存矩阵的状态
	glPushMatrix();
	//旋转、平移一定的程度
	glTranslatef(0.0,0.0,-100);
	glRotatef(45.0,1.0,1.0,1.0);
	glColor3f(1.0,0.0,0.0);
	//绘制一个茶壶
	auxWireTeapot(40.0);
	//弹出当前的矩阵
	glPopMatrix();
	
	//同上面建立另一个物体的视口
	glPopMatrix();
	glPushMatrix();
	glViewport(200,200,100,100);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	//建立剪切体
	gluPerspective(90.0,1.0,1.0,200);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	//保存矩阵的状态
	glPushMatrix();
	//旋转、平移一定的程度
	glTranslatef(0.0,0.0,-40);
	glRotatef(45.0,1.0,1.0,1.0);
	glColor3f(0.0,1.0,0.0);
	//绘制一个球体
	auxWireSphere(20.0);
	//弹出当前的矩阵
	glPopMatrix();
	glPopMatrix();

	glFinish();
	SwapBuffers(wglGetCurrentDC());
}
//add up