fogcolorindexview.cpp

C:Documents and SettingsAdministrator桌面VC++多媒体特效制作百例CHAR13FogColorIndex

// FogColorIndexView.cpp : implementation of the CFogColorIndexView class
//

#include "stdafx.h"
#include "FogColorIndex.h"

#include "FogColorIndexDoc.h"
#include "FogColorIndexView.h"

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

//add down定义常量
#define NUMCOLORS 32
#define RAMPSTART 16
//add up定义常量

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

/////////////////////////////////////////////////////////////////////////////
// CFogColorIndexView

IMPLEMENT_DYNCREATE(CFogColorIndexView, CView)

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

/////////////////////////////////////////////////////////////////////////////
// CFogColorIndexView construction/destruction

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

CFogColorIndexView::~CFogColorIndexView()
{
}

BOOL CFogColorIndexView::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);
}

/////////////////////////////////////////////////////////////////////////////
// CFogColorIndexView drawing

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

/////////////////////////////////////////////////////////////////////////////
// CFogColorIndexView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CFogColorIndexView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CFogColorIndexView message handlers

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

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

void CFogColorIndexView::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(-2.0,2.0,-2.0*(GLfloat)h/(GLfloat)w,
				2.0*(GLfloat)h/(GLfloat)w,0.0,10.0);
	else
		glOrtho(-2.0*(GLfloat)w/(GLfloat)h,
				2.0*(GLfloat)w/(GLfloat)h,
				-2.0,2.0,0.0,10.0);

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	//add up
}

//add down
void CFogColorIndexView::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);

	//进行深度测试
	int i;
	glEnable(GL_DEPTH_TEST);
	glDepthFunc(GL_LEQUAL);
	for(i=0;i<NUMCOLORS;i++)
	{
		GLfloat shade;
		shade=(GLfloat)(NUMCOLORS-i)/(GLfloat)NUMCOLORS;
		auxSetOneColor(16+i,shade,shade,shade);
	}

	//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);
		glFogi(GL_FOG_INDEX,NUMCOLORS);
		glFogf(GL_FOG_START,0.0);
		glFogf(GL_FOG_END,4.0);
		glHint(GL_FOG_HINT,GL_NICEST);
		glClearIndex((GLfloat)(NUMCOLORS+RAMPSTART-1));
	}
}

BOOL CFogColorIndexView::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 CFogColorIndexView::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)绘制一个茶壶
	glPushMatrix();
	glTranslatef(-1.0,-0.0,-1.0);
	glIndexi(RAMPSTART);
	auxSolidTeapot(0.3);
	glPopMatrix();

	//在(-0.5,-0.5,-7.0)绘制一个茶壶
	glPushMatrix();
	glTranslatef(0.0,-0.0,-2.25);
	glIndexi(RAMPSTART);
	auxSolidTeapot(0.3);
	glPopMatrix();

	//在(2.0,0.8,-10.0)绘制一个茶壶
	glPushMatrix();
	glTranslatef(1.0,-0.0,-3.5);
	glIndexi(RAMPSTART);
	auxSolidTeapot(0.3);
	glPopMatrix();

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