fogview.cpp

visual c++ 实例编程

// FogView.cpp : implementation of the CFogView class
//

#include "stdafx.h"
#include "Fog.h"

#include "FogDoc.h"
#include "FogView.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

/////////////////////////////////////////////////////////////////////////////
// CFogView

IMPLEMENT_DYNCREATE(CFogView, CView)

BEGIN_MESSAGE_MAP(CFogView, CView)
	//{{AFX_MSG_MAP(CFogView)
	ON_WM_DESTROY()
	ON_WM_CREATE()
	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()

/////////////////////////////////////////////////////////////////////////////
// CFogView construction/destruction

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

}

CFogView::~CFogView()
{
}

BOOL CFogView::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);
}

/////////////////////////////////////////////////////////////////////////////
// CFogView drawing

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

/////////////////////////////////////////////////////////////////////////////
// CFogView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CFogView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CFogView message handlers

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

	hrc = ::wglGetCurrentContext();

	::wglMakeCurrent(NULL,  NULL);

	if (hrc)
		::wglDeleteContext(hrc);

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

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

BOOL CFogView::OnEraseBkgnd(CDC* pDC) 
{
	// TODO: Add your message handler code here and/or call default
	
	return CView::OnEraseBkgnd(pDC);
}

void CFogView::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();
	
	//建立正交投影
	if(w<=(h*3))
		glOrtho(-6.0,6.0,-2.0*((GLfloat)h*3)/(GLfloat)w,
				2.0*((GLfloat)h*3)/(GLfloat)w,0.0,10.0);
	else
		glOrtho(-6.0*(GLfloat)w/((GLfloat)h*3),
				6.0*(GLfloat)w/((GLfloat)h*3),
				-2.0,2.0,0.0,10.0);

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	//add up
	
}
//add down
void CFogView::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);

	//定义材质和光照
	GLfloat mat_ambient[]={0.7,0.6,0.4,1.00};
	GLfloat mat_diffuse[]={0.7,0.55,2.9,1.0};
	GLfloat mat_specular[]={1.0,1.0,1.0,0.15};
	GLfloat mat_shininess[]={15.0};
	GLfloat position[]={5.0,5.0,5.0,1.0};
	GLfloat fogColor[4]={0.6,0.6,0.6,1.0};

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

	//进行深度测试
	glEnable(GL_DEPTH_TEST);
	glDepthFunc(GL_LESS);

	glLightfv(GL_LIGHT0,GL_POSITION,position);

	glFrontFace(GL_CW);
	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0);

	//产生雾的效果
	//雾化的步骤：
	//1. 使用glEnable(GL_FOG)启用雾；
	//2. 控制雾。调用函数glFog*()来选择控制浓度和颜色的雾方程；
	//3. 若有必要，可用函数glHint(GL_FOG_HINT)提供一个值。
	glEnable(GL_FOG);
	{
		glFogi(GL_FOG_MODE,GL_LINEAR);
		glFogfv(GL_FOG_COLOR,fogColor);
		glFogf(GL_FOG_START,3.0);
		glFogf(GL_FOG_END,15.0);
		glHint(GL_FOG_HINT,GL_DONT_CARE);
		
	}
	glDepthFunc(GL_LEQUAL);
}

BOOL CFogView::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 CFogView::DrawScene(void)
{
	//清除颜色缓冲区和深度缓冲区
	glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

	//在(-3.0,-1.5,-2.0)绘制一个圆锥体
	glPushMatrix();
	glTranslatef(-3.0,-1.5,-2.0);
	glRotatef(-90.0,1.0,0.0,0.0);
	glIndexi(16);
	auxSolidCone(1.0,2.0);
	glPopMatrix();

	//在(-0.5,-0.5,-7.0)绘制一个圆锥体
	glPushMatrix();
	glTranslatef(-0.5,-0.5,-7.0);
	glRotatef(-90.0,1.0,0.0,0.0);
	glIndexi(16);
	auxSolidCone(1.0,2.0);
	glPopMatrix();

	//在(2.0,0.8,-10.0)绘制一个圆锥体
	glPushMatrix();
	glTranslatef(2.0,0.8,-10.0);
	glRotatef(-90.0,1.0,0.0,0.0);
	glIndexi(16);
	auxSolidCone(1.0,2.0);
	glPopMatrix();

	//刷新屏幕，绘制图形
	glFinish();
	SwapBuffers(wglGetCurrentDC());
}
//add up