triselectview.cpp

C:Documents and SettingsAdministrator桌面VC++多媒体特效制作百例CHAR19TriSelect

// TriSelectView.cpp : implementation of the CTriSelectView class
//

#include "stdafx.h"
#include "TriSelect.h"

#include "TriSelectDoc.h"
#include "TriSelectView.h"

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <time.h>

struct object {
	  float v1[2];
	  float v2[2];
	  float v3[2];
	  float color[3];
} objects[MAXOBJS];

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

/////////////////////////////////////////////////////////////////////////////
// CTriSelectView

IMPLEMENT_DYNCREATE(CTriSelectView, CView)

BEGIN_MESSAGE_MAP(CTriSelectView, CView)
	//{{AFX_MSG_MAP(CTriSelectView)
	ON_WM_CREATE()
	ON_WM_DESTROY()
	ON_WM_ERASEBKGND()
	ON_WM_SIZE()
	ON_WM_LBUTTONDOWN()
	ON_WM_RBUTTONDOWN()
	ON_WM_LBUTTONDBLCLK()
	ON_WM_KEYDOWN()
	//}}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()

/////////////////////////////////////////////////////////////////////////////
// CTriSelectView construction/destruction

CTriSelectView::CTriSelectView()
{
	m_pDC = NULL;

	windW = 300; windH = 300;

	zRotation = 90.0;
	zoom = 1.0;
	linePoly = GL_FALSE;

}

CTriSelectView::~CTriSelectView()
{
}

BOOL CTriSelectView::PreCreateWindow(CREATESTRUCT& cs)
{
	//add down
	cs.style |= WS_CLIPSIBLINGS | WS_CLIPCHILDREN;
	//add up

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CTriSelectView drawing

void CTriSelectView::OnDraw(CDC* pDC)
{
	CTriSelectDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);

	//add down
	DrawScene();
	//add up
}

/////////////////////////////////////////////////////////////////////////////
// CTriSelectView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CTriSelectView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CTriSelectView message handlers

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

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

void CTriSelectView::OnSize(UINT nType, int cx, int cy) 
{
	CView::OnSize(nType, cx, cy);
	
  windW = cx;
  windH = cy;
  glViewport(0, 0, windW, windH);
  glGetIntegerv(GL_VIEWPORT, vp);
	
}

//add down
void CTriSelectView::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);

	numObjects = 10;
	InitObjects(numObjects);
}

BOOL CTriSelectView::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 CTriSelectView::DrawScene()
{
  glPushMatrix();
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluOrtho2D(-175, 175, -175, 175);
  glMatrixMode(GL_MODELVIEW);
  glClearColor(0.0, 0.0, 0.0, 0.0);
  glClear(GL_COLOR_BUFFER_BIT);
  glScalef(zoom, zoom, zoom);
  glRotatef(zRotation, 0, 0, 1);
  Render(GL_RENDER);
  glPopMatrix();

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

void CTriSelectView::InitObjects(GLint num)
{
  GLint i;
  float x, y;

  if (num > MAXOBJS) {
    num = MAXOBJS;
  }
  if (num < 1) {
    num = 1;
  }
  objectCount = num;

  srand((unsigned int) time(NULL));
  for (i = 0; i < num; i++) {
    x = (rand() % 300) - 150;
    y = (rand() % 300) - 150;

    objects[i].v1[0] = x + (rand() % 50) - 25;
    objects[i].v2[0] = x + (rand() % 50) - 25;
    objects[i].v3[0] = x + (rand() % 50) - 25;
    objects[i].v1[1] = y + (rand() % 50) - 25;
    objects[i].v2[1] = y + (rand() % 50) - 25;
    objects[i].v3[1] = y + (rand() % 50) - 25;
    objects[i].color[0] = ((rand() % 100) + 50) / 150.0;
    objects[i].color[1] = ((rand() % 100) + 50) / 150.0;
    objects[i].color[2] = ((rand() % 100) + 50) / 150.0;
  }
}

void CTriSelectView::Render(GLenum mode)
{
  GLint i;

  for (i = 0; i < objectCount; i++) {
    if (mode == GL_SELECT) {
      glLoadName(i);
    }
    glColor3fv(objects[i].color);
    glBegin(GL_POLYGON);
    glVertex2fv(objects[i].v1);
    glVertex2fv(objects[i].v2);
    glVertex2fv(objects[i].v3);
    glEnd();
  }
}

GLint CTriSelectView::DoSelect(GLint x, GLint y)
{
  GLint hits;

  glSelectBuffer(MAXSELECT, selectBuf);
  glRenderMode(GL_SELECT);
  glInitNames();
  glPushName(~0);

  glPushMatrix();

  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluPickMatrix(x, windH - y, 4, 4, vp);
  gluOrtho2D(-175, 175, -175, 175);
  glMatrixMode(GL_MODELVIEW);

  glClearColor(0.0, 0.0, 0.0, 0.0);
  glClear(GL_COLOR_BUFFER_BIT);

  glScalef(zoom, zoom, zoom);
  glRotatef(zRotation, 0, 0, 1);

  Render(GL_SELECT);

  glPopMatrix();

  hits = glRenderMode(GL_RENDER);
  if (hits <= 0) {
    return -1;
  }
  return selectBuf[(hits - 1) * 4 + 3];
}

void CTriSelectView::RecolorTri(GLint h)
{
  objects[h].color[0] = ((rand() % 100) + 50) / 150.0;
  objects[h].color[1] = ((rand() % 100) + 50) / 150.0;
  objects[h].color[2] = ((rand() % 100) + 50) / 150.0;
}

void CTriSelectView::DeleteTri(GLint h)
{
  objects[h] = objects[objectCount - 1];
  objectCount--;
}

void CTriSelectView::GrowTri(GLint h)
{
  float v[2];
  float *oldV;
  GLint i;

  v[0] = objects[h].v1[0] + objects[h].v2[0] + objects[h].v3[0];
  v[1] = objects[h].v1[1] + objects[h].v2[1] + objects[h].v3[1];
  v[0] /= 3;
  v[1] /= 3;

  for (i = 0; i < 3; i++) {
    switch (i) {
    case 0:
      oldV = objects[h].v1;
      break;
    case 1:
      oldV = objects[h].v2;
      break;
    case 2:
      oldV = objects[h].v3;
      break;
    }
    oldV[0] = 1.5 * (oldV[0] - v[0]) + v[0];
    oldV[1] = 1.5 * (oldV[1] - v[1]) + v[1];
  }
}

void CTriSelectView::DumpFeedbackVert(GLint * i, GLint n)
{
  GLint index;

  index = *i;
  if (index + 7 > n) {
    *i = n;
    printf("  ???\n");
    return;
  }
  printf("  (%g %g %g), color = (%4.2f %4.2f %4.2f)\n",
    feedBuf[index],
    feedBuf[index + 1],
    feedBuf[index + 2],
    feedBuf[index + 3],
    feedBuf[index + 4],
    feedBuf[index + 5]);
  index += 7;
  *i = index;
}

void CTriSelectView::DrawFeedback(GLint n)
{
  GLint i;
  GLint verts;

  printf("Feedback results (%d floats):\n", n);
  for (i = 0; i < n; i++) {
    switch ((GLint) feedBuf[i]) {
    case GL_POLYGON_TOKEN:
      printf("Polygon");
      i++;
      if (i < n) {
        verts = (GLint) feedBuf[i];
        i++;
        printf(": %d vertices", verts);
      } else {
        verts = 0;
      }
      printf("\n");
      while (verts) {
        DumpFeedbackVert(&i, n);
        verts--;
      }
      i--;
      break;
    case GL_LINE_TOKEN:
      printf("Line:\n");
      i++;
      DumpFeedbackVert(&i, n);
      DumpFeedbackVert(&i, n);
      i--;
      break;
    case GL_LINE_RESET_TOKEN:
      printf("Line Reset:\n");
      i++;
      DumpFeedbackVert(&i, n);
      DumpFeedbackVert(&i, n);
      i--;
      break;
    default:
      printf("%9.2f\n", feedBuf[i]);
      break;
    }
  }
  if (i == MAXFEED) {
    printf("...\n");
  }
  printf("\n");
}

void CTriSelectView::DoFeedback(void)
{
  GLint x;

  glFeedbackBuffer(MAXFEED, GL_3D_COLOR, feedBuf);
  (void) glRenderMode(GL_FEEDBACK);

  glPushMatrix();

  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluOrtho2D(-175, 175, -175, 175);
  glMatrixMode(GL_MODELVIEW);

  glClearColor(0.0, 0.0, 0.0, 0.0);
  glClear(GL_COLOR_BUFFER_BIT);

  glScalef(zoom, zoom, zoom);
  glRotatef(zRotation, 0, 0, 1);

  Render(GL_FEEDBACK);

  glPopMatrix();

  x = glRenderMode(GL_RENDER);
  if (x == -1) {
    x = MAXFEED;
  }
  DrawFeedback((GLint) x);
}

void CTriSelectView::OnLButtonDown(UINT nFlags, CPoint point) 
{
    hit = DoSelect((GLint) point.x, (GLint) point.y);
    RecolorTri(hit);
	InvalidateRect(FALSE);

	CView::OnLButtonDown(nFlags, point);
}

void CTriSelectView::OnRButtonDown(UINT nFlags, CPoint point) 
{
    hit = DoSelect((GLint) point.x, (GLint) point.y);
    DeleteTri(hit);
	InvalidateRect(FALSE);
	
	CView::OnRButtonDown(nFlags, point);
}

void CTriSelectView::OnLButtonDblClk(UINT nFlags, CPoint point) 
{
    hit = DoSelect((GLint) point.x, (GLint) point.y);
    GrowTri(hit);
	InvalidateRect(FALSE);
	
	CView::OnLButtonDblClk(nFlags, point);
}

void CTriSelectView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
  switch (nChar) {
  case VK_LEFT:
    zoom /= 0.75;
    InvalidateRect(FALSE);
    break;
  case VK_RIGHT:
    zoom *= 0.75;
    InvalidateRect(FALSE);
    break;
  case VK_UP:
    DoFeedback();
    InvalidateRect(FALSE);
    break;
  case VK_DOWN:
    linePoly = !linePoly;
    if (linePoly) {
      glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
    } else {
      glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    }
    InvalidateRect(FALSE);
    break;
  }
	CView::OnKeyDown(nChar, nRepCnt, nFlags);
}