nurbssurfview.cpp

C:Documents and SettingsAdministrator桌面VC++多媒体特效制作百例CHAR17NurbsSurf

// NurbsSurfView.cpp : implementation of the CNurbsSurfView class
//

#include "stdafx.h"
#include "NurbsSurf.h"

#include "NurbsSurfDoc.h"
#include "NurbsSurfView.h"

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

//定义控制顶点add down
GLfloat ctrlpoints[4][4][3];
GLUnurbsObj* theNurb;
//定义控制顶点add up

//add down函数说明
void init_surface(void);
//add up函数说明

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

/////////////////////////////////////////////////////////////////////////////
// CNurbsSurfView

IMPLEMENT_DYNCREATE(CNurbsSurfView, CView)

BEGIN_MESSAGE_MAP(CNurbsSurfView, CView)
	//{{AFX_MSG_MAP(CNurbsSurfView)
	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()

/////////////////////////////////////////////////////////////////////////////
// CNurbsSurfView construction/destruction

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

CNurbsSurfView::~CNurbsSurfView()
{
}

BOOL CNurbsSurfView::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);
}

/////////////////////////////////////////////////////////////////////////////
// CNurbsSurfView drawing

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

/////////////////////////////////////////////////////////////////////////////
// CNurbsSurfView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CNurbsSurfView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CNurbsSurfView message handlers

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

void CNurbsSurfView::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 CNurbsSurfView::OnEraseBkgnd(CDC* pDC) 
{
	return TRUE;
}

void CNurbsSurfView::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();
	//建立透视变换下的剪切体
	gluPerspective(45.0,(GLdouble)w/(GLdouble)h,3.0,8.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glTranslatef(0.0, 1.0, -5.0);
	//add up
}

//add down
void CNurbsSurfView::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);

	//定义曲面材质为金色
	GLfloat mat_diffuse[]={0.88,0.66,0.22,1.0};
	GLfloat mat_specular[]={0.92,0.9,0.0,1.0};
	GLfloat mat_shininess[]={80.0};

	//将初始屏幕设置为白色
	glClearColor(1.0,1.0,1.0,1.0);

	glMaterialfv(GL_FRONT,GL_DIFFUSE,mat_diffuse);
	glMaterialfv(GL_FRONT,GL_SPECULAR,mat_specular);
	glMaterialfv(GL_FRONT,GL_SHININESS,mat_shininess);

	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0);

	glDepthFunc(GL_LESS);
	glEnable(GL_DEPTH_TEST);

	glEnable(GL_AUTO_NORMAL);
	glEnable(GL_NORMALIZE);

	init_surface();
	theNurb=gluNewNurbsRenderer();
	gluNurbsProperty(theNurb,GLU_SAMPLING_TOLERANCE,25.0);
	gluNurbsProperty(theNurb,GLU_DISPLAY_MODE,GLU_FILL);
}

BOOL CNurbsSurfView::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 CNurbsSurfView::DrawScene(void)
{
	GLfloat knots[8]={0.0,0.0,0.0,0.0,1.0,1.0,1.0,1.0};
	//清除颜色缓冲区和深度缓冲区
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	glPushMatrix();
	glRotatef(330.0,1.0,0.0,0.0);
	glScalef(0.5,0.5,0.5);
	gluBeginSurface(theNurb);
	gluNurbsSurface(theNurb,
					8,knots,
					8,knots,
					4*3,3,
					&ctrlpoints[0][0][0],
					4,4,
					GL_MAP2_VERTEX_3);
	gluEndSurface(theNurb);
	glPopMatrix();

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

//初始化控制点坐标，x,y,z范围从-3到3
void init_surface(void)
{
	int u,v;
	for(u=0;u<4;u++)
	{
		for(v=0;v<4;v++)
		{
			ctrlpoints[u][v][0]=2.0*((GLfloat)u-1.5);
			ctrlpoints[u][v][1]=2.0*((GLfloat)v-1.5);
			if((u==1||u==2)&&(v==1||v==2))
				ctrlpoints[u][v][2]=3.0;
			else
				ctrlpoints[u][v][2]=-3.0;
		}
	}
}
//add up