Okay I am a member at Chegg which has helped me ever so often indirectly so this

ID: 3666176 • Letter: O

Question

Okay I am a member at Chegg which has helped me ever so often indirectly so this is the first time i am actually going to ask help for this. I need help from a computer science expert for Visual Studio C++/openGL. I was able to get a red triangle to output in the beginning open GL however now my instructor gave us this assignment.

A stationary 3D scene is interesting, and much effort has been spent producing as accurate a scene as possible using various rendering techniques. However, the applications of a single-frame render are somewhat limited. In this assignment, we are going to introduce motion and interactivity to our scene. Using C++, OpenGL, and Microsoft Visual Studio, create a program that does the following:

Applies a transformation to an object that varies over time, using two of the following examples:

An object that travels back and forth along a line repeatedly

An object that moves in a circle

An object that continually rotates

An object that scales up and down repeatedly

Uses a camera class to control the display of the scene

Allows the user to reposition the camera in the scene using the arrow keys

Submit your completed assignment to the drop box below. Please check the Course Calendar for specific due dates.

Save your assignment as a compressed (zipped) folder. (Mac users, please remember to append the ."zip" extension to the filename if necessary.) As the course may complain about intermediary output files in visual studio, be sure to perform a "Clean Project" action before zipping the folder. Your code must compile to receive credit. The name of the file should be your first initial and last name, followed by an underscore and the name of the assignment, and an underscore and the date. An example is shown below:

I was able to get the triangle to output with a freeglut.dll and glew32.dll file package. I am so lost with this. I dont even know how to get the camera working or if i need some other .dll file. Maybe if somebody could walk me through all the steps to set up this Visual Studio Project from scratch i feel i would understand what i am supposed to do. I dont know whether i should make a camera.cpp file or what i am supposed to do. I am only supposed to do two of the examples however i would like to experiment with all of them. Please if somebody could take the time to help me or tutor me i would appreciate it.

Explanation / Answer

#define WM_CAP_START 0x0400
#define WM_CAP_DRIVER_CONNECT (WM_CAP_START + 10)
#define WM_CAP_DRIVER_DISCONNECT (WM_CAP_START + 11)
#define WM_CAP_EDIT_COPY (WM_CAP_START + 30)
#define WM_CAP_GRAB_FRAME (WM_CAP_START + 60)
#define WM_CAP_SET_SCALE (WM_CAP_START + 53)
#define WM_CAP_SET_PREVIEWRATE (WM_CAP_START + 52)
#define WM_CAP_SET_PREVIEW (WM_CAP_START + 50)
#define WM_CAP_DLG_VIDEOSOURCE (WM_CAP_START + 42)
#define WM_CAP_STOP (WM_CAP_START+ 68)
#include <windows.h>
#include <vfw.h>
LRESULT CALLBACK WindowProc (HWND, UINT, WPARAM, LPARAM);
PBITMAPINFO CreateBitmapInfoStruct(HWND hwnd, HBITMAP hBmp);
void CreateBMPFile(HWND hwnd, LPTSTR pszFile, PBITMAPINFO pbi, HBITMAP hBMP, HDC hDC);
LRESULT CALLBACK WindowProc (HWND, UINT, WPARAM, LPARAM);
PBITMAPINFO CreateBitmapInfoStruct(HWND hwnd, HBITMAP hBmp);
void CreateBMPFile(HWND hwnd, LPTSTR pszFile, PBITMAPINFO pbi, HBITMAP hBMP, HDC hDC);
char szAppName [] = TEXT("WebCam");
HWND camhwnd;
HDC hdc ;
HDC hdcMem;
PAINTSTRUCT ps;
HBITMAP hbm;
RECT rc;

//WinMain -- Main Window
int WINAPI WinMain ( HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow )
{

HWND hwnd;
MSG msg;

WNDCLASS wc;
wc.style = CS_HREDRAW|CS_VREDRAW;
wc.lpfnWndProc = WindowProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(GetModuleHandle(NULL), IDI_APPLICATION);
wc.hCursor = LoadCursor (NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH) (COLOR_WINDOW+1);
wc.lpszMenuName = NULL;
wc.lpszClassName = szAppName;

RegisterClass (&wc);

// Create the window
hwnd = CreateWindow (szAppName,szAppName,WS_OVERLAPPED|WS_CAPTION|WS_SYSMENU|

WS_MINIMIZEBOX,CW_USEDEFAULT,CW_USEDEFAULT,300,600,0,0,hInstance,0);

ShowWindow (hwnd,SW_SHOW);
UpdateWindow (hwnd);

while (GetMessage(&msg,0,0,0))
{
if(!IsDialogMessage(hwnd, &msg))
{
TranslateMessage (&msg);
DispatchMessage (&msg);
}
}
return msg.wParam;
}
//Main Window Procedure WindowProc
LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HINSTANCE hInstance = GetModuleHandle(NULL);

//some buttons
HWND hButtStartCam;
HWND hButtStopCam;
HWND hButtGrabFrame;

switch (message) /* handle the messages */
{

case WM_CTLCOLORSTATIC:
SetBkMode(hdc,TRANSPARENT);
return (LRESULT)CreateSolidBrush(0xFFFFFF);

case WM_CREATE:
{
hButtStartCam = CreateWindowEx(0,"BUTTON","Start Camera",WS_CHILD | WS_VISIBLE,
               0,0,100,20,hwnd,(HMENU)1,hInstance, 0);
hButtStopCam = CreateWindowEx(0,"BUTTON","Stop Camera",WS_CHILD | WS_VISIBLE,
               0,25,100,20,hwnd,(HMENU)2,hInstance, 0);
hButtGrabFrame = CreateWindowEx(0,"BUTTON","Grab Frame",WS_CHILD | WS_VISIBLE,
               0,50,100,20,hwnd,(HMENU)3,hInstance, 0);

camhwnd = capCreateCaptureWindow ("camera window", WS_CHILD , 0, 100, 300, 300, hwnd, 0);
SendMessage(camhwnd,WM_CAP_DRIVER_CONNECT,0,0);
SendMessage(camhwnd,WM_CAP_DLG_VIDEOSOURCE,0,0);

break;
}

case WM_COMMAND:
{
switch(LOWORD(wParam))
{

case 1:
{
ShowWindow(camhwnd,SW_SHOW);
SendMessage(camhwnd,WM_CAP_DRIVER_CONNECT,0,0);
SendMessage(camhwnd, WM_CAP_SET_SCALE, true , 0);
SendMessage(camhwnd, WM_CAP_SET_PREVIEWRATE, 66, 0);
SendMessage(camhwnd, WM_CAP_SET_PREVIEW, true , 0);
break;
}

case 2:
{
ShowWindow(camhwnd,SW_HIDE);
SendMessage(camhwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
break;
}

case 3:
{
//Grab a Frame
SendMessage(camhwnd, WM_CAP_GRAB_FRAME, 0, 0);
//Copy the frame we have just grabbed to the clipboard
SendMessage(camhwnd, WM_CAP_EDIT_COPY,0,0);

//Copy the clipboard image data to a HBITMAP object called hbm
hdc = BeginPaint(camhwnd, &ps);
hdcMem = CreateCompatibleDC(hdc);
if (hdcMem != NULL)
{
   if (OpenClipboard(camhwnd))
   {
hbm = (HBITMAP) GetClipboardData(CF_BITMAP);
SelectObject(hdcMem, hbm);
GetClientRect(camhwnd, &rc);
CloseClipboard();
   }
}
//Save hbm to a .bmp file called Frame.bmp
PBITMAPINFO pbi = CreateBitmapInfoStruct(hwnd, hbm);
CreateBMPFile(hwnd, "Frame.bmp", pbi, hbm, hdcMem);

SendMessage(camhwnd,WM_CAP_DRIVER_CONNECT,0,0);
SendMessage(camhwnd, WM_CAP_SET_SCALE, true , 0);
SendMessage(camhwnd, WM_CAP_SET_PREVIEWRATE, 66, 0);
SendMessage(camhwnd, WM_CAP_SET_PREVIEW, true , 0);
break;
}
}
break;
}

case WM_DESTROY:
{
SendMessage(camhwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
PostQuitMessage(0); /* send a WM_QUIT to the message queue */
break;
}

default: /* for messages that we don't deal with */
return DefWindowProc(hwnd, message, wParam, lParam);
}
return 0;
}
void CreateBMPFile(HWND hwnd, LPTSTR pszFile, PBITMAPINFO pbi, HBITMAP hBMP, HDC hDC)
{
HANDLE hf; // file handle
BITMAPFILEHEADER hdr; // bitmap file-header
PBITMAPINFOHEADER pbih; // bitmap info-header
LPBYTE lpBits; // memory pointer
DWORD dwTotal; // total count of bytes
DWORD cb; // incremental count of bytes
BYTE *hp; // byte pointer
DWORD dwTmp;

pbih = (PBITMAPINFOHEADER) pbi;
lpBits = (LPBYTE) GlobalAlloc(GMEM_FIXED, pbih->biSizeImage);

if (!lpBits)
{
MessageBox(hwnd,"GlobalAlloc","Error", MB_OK );
}
// Retrieve the color table (RGBQUAD array) and the bits
// (array of palette indices) from the DIB.
if (!GetDIBits(hDC, hBMP, 0, (WORD) pbih->biHeight, lpBits, pbi,DIB_RGB_COLORS))
{
MessageBox(hwnd,"GetDIBits","Error",MB_OK );
}
// Create the .BMP file.
hf = CreateFile(pszFile,GENERIC_READ | GENERIC_WRITE,(DWORD) 0,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,(HANDLE) NULL);
if (hf == INVALID_HANDLE_VALUE)
{
MessageBox( hwnd,"CreateFile","Error", MB_OK);
}

hdr.bfType = 0x4d42; // File type designator "BM" 0x42 = "B" 0x4d = "M"
// Compute the size of the entire file.
hdr.bfSize = (DWORD) (sizeof(BITMAPFILEHEADER) + pbih->biSize + pbih->biClrUsed * sizeof(RGBQUAD) + pbih->biSizeImage);
hdr.bfReserved1 = 0;
hdr.bfReserved2 = 0;
// Compute the offset to the array of color indices.
hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) + pbih->biSize + pbih->biClrUsed * sizeof (RGBQUAD);
// Copy the BITMAPFILEHEADER into the .BMP file.
if (!WriteFile(hf, (LPVOID) &hdr, sizeof(BITMAPFILEHEADER), (LPDWORD) &dwTmp, NULL) )
{
MessageBox(hwnd,"WriteFileHeader","Error",MB_OK );
}
// Copy the BITMAPINFOHEADER and RGBQUAD array into the file.
if (!WriteFile(hf, (LPVOID) pbih, sizeof(BITMAPINFOHEADER) + pbih->biClrUsed * sizeof (RGBQUAD), (LPDWORD) &dwTmp, NULL))
{
MessageBox(hwnd,"WriteInfoHeader","Error",MB_OK );
}
// Copy the array of color indices into the .BMP file.
dwTotal = cb = pbih->biSizeImage;
hp = lpBits;
if (!WriteFile(hf, (LPSTR) hp, (int) cb, (LPDWORD) &dwTmp,NULL))
{
MessageBox(hwnd,"WriteFile","Error",MB_OK );
}
// Close the .BMP file.
if (!CloseHandle(hf))
{
MessageBox(hwnd,"CloseHandle","Error",MB_OK );
}

// Free memory.
GlobalFree((HGLOBAL)lpBits);
}

PBITMAPINFO CreateBitmapInfoStruct(HWND hwnd, HBITMAP hBmp)
{
BITMAP bmp;
PBITMAPINFO pbmi;
WORD cClrBits;
// Retrieve the bitmap color format, width, and height.
if (!GetObject(hBmp, sizeof(BITMAP), (LPSTR)&bmp))
{
MessageBox(hwnd,"GetObject","Error",MB_OK );
}
// Convert the color format to a count of bits.
cClrBits = (WORD)(bmp.bmPlanes * bmp.bmBitsPixel);
if (cClrBits == 1)
cClrBits = 1;
else if (cClrBits <= 4)
cClrBits = 4;
else if (cClrBits <= 8)
cClrBits = 8;
else if (cClrBits <= 16)
cClrBits = 16;
else if (cClrBits <= 24)
cClrBits = 24;
else cClrBits = 32;

// Allocate memory for the BITMAPINFO structure. (This structure
// contains a BITMAPINFOHEADER structure and an array of RGBQUAD
// data structures.)

if (cClrBits != 24)
{
pbmi = (PBITMAPINFO) LocalAlloc(LPTR,sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * (1<< cClrBits));
}
// There is no RGBQUAD array for the 24-bit-per-pixel format.
else
pbmi = (PBITMAPINFO) LocalAlloc(LPTR, sizeof(BITMAPINFOHEADER));

// Initialize the fields in the BITMAPINFO structure.
pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
pbmi->bmiHeader.biWidth = bmp.bmWidth;
pbmi->bmiHeader.biHeight = bmp.bmHeight;
pbmi->bmiHeader.biPlanes = bmp.bmPlanes;
pbmi->bmiHeader.biBitCount = bmp.bmBitsPixel;
if (cClrBits < 24)
{
pbmi->bmiHeader.biClrUsed = (1<<cClrBits);
}
// If the bitmap is not compressed, set the BI_RGB flag.
pbmi->bmiHeader.biCompression = BI_RGB;

// Compute the number of bytes in the array of color
// indices and store the result in biSizeImage.
// For Windows NT, the width must be DWORD aligned unless
// the bitmap is RLE compressed. This example shows this.
// For Windows 95/98/Me, the width must be WORD aligned unless the
// bitmap is RLE compressed.
pbmi->bmiHeader.biSizeImage = ((pbmi->bmiHeader.biWidth * cClrBits +31) & ~31) /8 * pbmi->bmiHeader.biHeight;
// Set biClrImportant to 0, indicating that all of the
// device colors are important.
pbmi->bmiHeader.biClrImportant = 0;

return pbmi; //return BITMAPINFO
}
//Setup some defines you need to connect to a webcam
//You can put these in a header
//If you are using Microsoft Visual Studio you wont need them as they
//Are included in Microsoft's version of vfw.h
#define WM_CAP_START 0x0400
#define WM_CAP_DRIVER_CONNECT (WM_CAP_START + 10)
#define WM_CAP_DRIVER_DISCONNECT (WM_CAP_START + 11)
#define WM_CAP_EDIT_COPY (WM_CAP_START + 30)
#define WM_CAP_GRAB_FRAME (WM_CAP_START + 60)
#define WM_CAP_SET_SCALE (WM_CAP_START + 53)
#define WM_CAP_SET_PREVIEWRATE (WM_CAP_START + 52)
#define WM_CAP_SET_PREVIEW (WM_CAP_START + 50)
#define WM_CAP_DLG_VIDEOSOURCE (WM_CAP_START + 42)
#define WM_CAP_STOP (WM_CAP_START+ 68)
//End of defines

#include <windows.h>
#include <vfw.h>
//Remember to Link to vfw32 Library, gdi32 Library

LRESULT CALLBACK WindowProc (HWND, UINT, WPARAM, LPARAM);
PBITMAPINFO CreateBitmapInfoStruct(HWND hwnd, HBITMAP hBmp);
void CreateBMPFile(HWND hwnd, LPTSTR pszFile, PBITMAPINFO pbi, HBITMAP hBMP, HDC hDC);

char szAppName [] = TEXT("WebCam");
HWND camhwnd;
HDC hdc ;
HDC hdcMem;
PAINTSTRUCT ps;
HBITMAP hbm;
RECT rc;

//WinMain -- Main Window
int WINAPI WinMain ( HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow )
{

HWND hwnd;
MSG msg;

RegisterClass (&wc);

// Create the window
hwnd = CreateWindow (szAppName,szAppName,WS_OVERLAPPED|WS_CAPTION|WS_SYSMENU|

WS_MINIMIZEBOX,CW_USEDEFAULT,CW_USEDEFAULT,300,600,0,0,hInstance,0);

ShowWindow (hwnd,SW_SHOW);
UpdateWindow (hwnd);

while (GetMessage(&msg,0,0,0))
{
if (!IsDialogMessage(hwnd, &msg))
{
TranslateMessage (&msg);
DispatchMessage (&msg);
}
}
return msg.wParam;
}

//Main Window Procedure WindowProc
LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HINSTANCE hInstance = GetModuleHandle(NULL);

//some buttons
HWND hButtStartCam;
HWND hButtStopCam;
HWND hButtGrabFrame;

switch (message) /* handle the messages */
{

case WM_CTLCOLORSTATIC:
SetBkMode(hdc,TRANSPARENT);
return (LRESULT)CreateSolidBrush(0xFFFFFF);

case WM_CREATE:
{
hButtStartCam = CreateWindowEx(0,"BUTTON","Start Camera",WS_CHILD | WS_VISIBLE,
0,0,100,20,hwnd,(HMENU)1,hInstance, 0);
hButtStopCam = CreateWindowEx(0,"BUTTON","Stop Camera",WS_CHILD | WS_VISIBLE,
0,25,100,20,hwnd,(HMENU)2,hInstance, 0);
hButtGrabFrame = CreateWindowEx(0,"BUTTON","Grab Frame",WS_CHILD | WS_VISIBLE,
0,50,100,20,hwnd,(HMENU)3,hInstance, 0);

camhwnd = capCreateCaptureWindow ("camera window", WS_CHILD , 0, 100, 300, 300, hwnd, 0);
SendMessage(camhwnd,WM_CAP_DRIVER_CONNECT,0,0);
SendMessage(camhwnd,WM_CAP_DLG_VIDEOSOURCE,0,0);

break;
}

case WM_COMMAND:
{
switch (LOWORD(wParam))
{

case 2:
{
ShowWindow(camhwnd,SW_HIDE);
SendMessage(camhwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
break;
}

case 3:
{
//Grab a Frame
SendMessage(camhwnd, WM_CAP_GRAB_FRAME, 0, 0);
//Copy the frame we have just grabbed to the clipboard
SendMessage(camhwnd, WM_CAP_EDIT_COPY,0,0);

//Copy the clipboard image data to a HBITMAP object called hbm
hdc = BeginPaint(camhwnd, &ps);
hdcMem = CreateCompatibleDC(hdc);
if (hdcMem != NULL)
{
if (OpenClipboard(camhwnd))
{
hbm = (HBITMAP) GetClipboardData(CF_BITMAP);
SelectObject(hdcMem, hbm);
GetClientRect(camhwnd, &rc);
CloseClipboard();
}
}
//Save hbm to a .bmp file called Frame.bmp
PBITMAPINFO pbi = CreateBitmapInfoStruct(hwnd, hbm);
CreateBMPFile(hwnd, "Frame.bmp", pbi, hbm, hdcMem);

case WM_DESTROY:
{
SendMessage(camhwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
PostQuitMessage(0); /* send a WM_QUIT to the message queue */
break;
}

default: /* for messages that we don't deal with */
return DefWindowProc(hwnd, message, wParam, lParam);
}
return 0;
}

void CreateBMPFile(HWND hwnd, LPTSTR pszFile, PBITMAPINFO pbi, HBITMAP hBMP, HDC hDC)
{
HANDLE hf; // file handle
BITMAPFILEHEADER hdr; // bitmap file-header
PBITMAPINFOHEADER pbih; // bitmap info-header
LPBYTE lpBits; // memory pointer
DWORD dwTotal; // total count of bytes
DWORD cb; // incremental count of bytes
BYTE *hp; // byte pointer
DWORD dwTmp;

pbih = (PBITMAPINFOHEADER) pbi;
lpBits = (LPBYTE) GlobalAlloc(GMEM_FIXED, pbih->biSizeImage);

NULL);
if (hf == INVALID_HANDLE_VALUE)
{
MessageBox( hwnd,"CreateFile","Error", MB_OK);
}

>biSizeImage);
hdr.bfReserved1 = 0;
hdr.bfReserved2 = 0;
// Compute the offset to the array of color indices.
hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) + pbih->biSize + pbih->biClrUsed * sizeof (RGBQUAD);
// Copy the BITMAPFILEHEADER into the .BMP file.
if (!WriteFile(hf, (LPVOID) &hdr, sizeof(BITMAPFILEHEADER), (LPDWORD) &dwTmp, NULL) )
{
MessageBox(hwnd,"WriteFileHeader","Error",MB_OK );
}
// Copy the BITMAPINFOHEADER and RGBQUAD array into the file.
if (!WriteFile(hf, (LPVOID) pbih, sizeof(BITMAPINFOHEADER) + pbih->biClrUsed * sizeof (RGBQUAD), (LPDWORD) &dwTmp,

NULL))
{
MessageBox(hwnd,"WriteInfoHeader","Error",MB_OK );
}
// Copy the array of color indices into the .BMP file.
dwTotal = cb = pbih->biSizeImage;
hp = lpBits;
if (!WriteFile(hf, (LPSTR) hp, (int) cb, (LPDWORD) &dwTmp,NULL))
{
MessageBox(hwnd,"WriteFile","Error",MB_OK );
}
// Close the .BMP file.
if (!CloseHandle(hf))
{
MessageBox(hwnd,"CloseHandle","Error",MB_OK );
}

// Free memory.
GlobalFree((HGLOBAL)lpBits);
}

// Allocate memory for the BITMAPINFO structure. (This structure
// contains a BITMAPINFOHEADER structure and an array of RGBQUAD
// data structures.)

return pbmi; //return BITMAPINFO
}

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