How to make an object motion move?

OpenGL OpenGL: Basic Coding
1

do you know how to make an object motion move from one point to another?

this is my script,opengl.cpp :

#include <windows.h>
#include <gl/gl.h>
#include <gl/glu.h>

HWND    hWnd;
HDC     hDC;
HGLRC   hRC;
HINSTANCE hInstance;

bool		keys[256];					// Array Used For The Keyboard Routine
bool		active=TRUE;					// Window Active Flag
bool		fullscreen=TRUE;

GLfloat rquad;

// Set up pixel format for graphics initialization
void SetupPixelFormat()
{
    PIXELFORMATDESCRIPTOR pfd, *ppfd;
    int pixelformat;

    ppfd = &pfd;

    ppfd->nSize = sizeof(PIXELFORMATDESCRIPTOR);
    ppfd->nVersion = 1;
    ppfd->dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
    ppfd->dwLayerMask = PFD_MAIN_PLANE;
    ppfd->iPixelType = PFD_TYPE_COLORINDEX;
    ppfd->cColorBits = 16;
    ppfd->cDepthBits = 16;
    ppfd->cAccumBits = 0;
    ppfd->cStencilBits = 0;

    pixelformat = ChoosePixelFormat(hDC, ppfd);
    SetPixelFormat(hDC, pixelformat, ppfd);
}

// Initialize OpenGL graphics
void InitGraphics()
{
    hDC = GetDC(hWnd);

    SetupPixelFormat();

    hRC = wglCreateContext(hDC);
    wglMakeCurrent(hDC, hRC);

    glClearColor(0.0f, 0.0f, 1.0f, 0);
    glClearDepth(1.0);
    glEnable(GL_DEPTH_TEST);
}

// Resize graphics to fit window
void ResizeGraphics()
{
    // Get new window size
    RECT rect;
	int width, height;
	GLfloat aspect;

    GetClientRect(hWnd, &rect);
    width = rect.right;
    height = rect.bottom;
    aspect = (GLfloat)width / height;

    // Adjust graphics to window size
    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(45.0, aspect, 1.0, 100.0);
    glMatrixMode(GL_MODELVIEW);
}

// Draw frame
void DrawGraphics()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    // Set location in front of camera
    glLoadIdentity();
    glTranslated(0, 0, -10);

    // Draw a square
    glBegin(GL_QUADS);
    glColor3d(0.4, 0, 0);
    glVertex3d(-8, -3, 0);
    glVertex3d(8, -3, 0);
    glVertex3d(8, -5, 0);
    glVertex3d(-8, -5, 0);
    glEnd();

	glTranslatef(0.0f,0.0f,0.0f);

    glBegin(GL_TRIANGLES);
    glColor3d(0, 1, 0);
    glVertex3d(0, 1, 0);
    glVertex3d(-3, -3, 0);
    glVertex3d(3, -3, 0);
    glEnd();

    glBegin(GL_QUADS);
	glColor3d(1.0f, 0, 1);
    glVertex3d(4, 2, 0);
    glVertex3d(6, 2, 0);
    glVertex3d(6, -3, 0);
    glVertex3d(4, -3, 0);
    glEnd();

    glRotatef(rquad,1.0f,0.0f,0.0f);
	glBegin(GL_QUADS);
	glColor3d(0, 0, 0);
    glVertex3d(-6, -1, 0);
    glVertex3d(-5, -1, 0);
    glVertex3d(-5, -3, 0);
    glVertex3d(-6, -3, 0);
    glEnd();

   if(keys[VK_RIGHT])//->>JIKA TEKAN TOMBOL KANAN
   {
     rquad+=1.0f;
   }
   else
   {
     rquad-=0.15f;
   }     					// Increase The Rotation Variable For The Triangle ( NEW )
    // Show the new scene
    SwapBuffers(hDC);	
}

// Handle window events and messages
LONG WINAPI MainWndProc (HWND hWnd, UINT uMsg, WPARAM  wParam, LPARAM  lParam)
{
    switch (uMsg)
    {
    case WM_SIZE:
        ResizeGraphics();
        break;

    case WM_CLOSE: 
        DestroyWindow(hWnd);
        break;

    case WM_KEYDOWN: 
        keys[wParam] = TRUE;
        break;
   
    case WM_KEYUP: 
        keys[wParam] = FALSE;
        break;
 
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
 
    // Default event handler
    default: 
        return DefWindowProc (hWnd, uMsg, wParam, lParam); 
        break; 
    } 
 
    return 1; 
}

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{

    const LPCWSTR appname = TEXT("OpenGL Sample");

    WNDCLASS wndclass;
    MSG      msg;
 
    // Define the window class
    wndclass.style         = 0;
    wndclass.lpfnWndProc   = (WNDPROC)MainWndProc;
    wndclass.cbClsExtra    = 0;
    wndclass.cbWndExtra    = 0;
    wndclass.hInstance     = hInstance;
    wndclass.hIcon         = LoadIcon(hInstance, appname);
    wndclass.hCursor       = LoadCursor(NULL,IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wndclass.lpszMenuName  = appname;
    wndclass.lpszClassName = appname;
 
    // Register the window class
    if (!RegisterClass(&wndclass)) return FALSE;
 
    // Create the window
    hWnd = CreateWindow(
            appname,
            appname,
            WS_OVERLAPPEDWINDOW | WS_CLIPSIBLINGS | WS_CLIPCHILDREN,
            CW_USEDEFAULT,
            CW_USEDEFAULT,
            800,
            600,
            NULL,
            NULL,
            hInstance,
            NULL);
 
    if (!hWnd) return FALSE;

    // Initialize OpenGL
    InitGraphics();

    // Display the window
    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    // Event loop
    while (1)
    {
        if (PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE) == TRUE)
        {
            if (!GetMessage(&msg, NULL, 0, 0)) return TRUE;

            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
        DrawGraphics();
    }

    wglDeleteContext(hRC);
    ReleaseDC(hWnd, hDC);
}

i have draw 4 objects on the screen :
-player (QUAD)
-mountain (TRIANGLE)
-ground (QUAD)
-building (QUAD)

i want to move the player object to coordinate (6x) from (-6x)
with [VK_RIGHT] control,please help me master:sorrow: ?

2

You move objects by applying a transformation to them (e.g. glTranslate() ). The amount you transform the object by should depend on the time that has elapsed since the last frame.

3

do you mean this.opengl.cpp :

void DrawGraphics()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    // Set location in front of camera
    glLoadIdentity();
    glTranslated(0, 0, -10);

    // Draw a square
    glBegin(GL_QUADS);
    glColor3d(0.4, 0, 0);
    glVertex3d(-8, -3, 0);
    glVertex3d(8, -3, 0);
    glVertex3d(8, -5, 0);
    glVertex3d(-8, -5, 0);
    glEnd();

	glTranslatef(0.0f,0.0f,0.0f);

    glBegin(GL_TRIANGLES);
    glColor3d(0, 1, 0);
    glVertex3d(0, 1, 0);
    glVertex3d(-3, -3, 0);
    glVertex3d(3, -3, 0);
    glEnd();

    glBegin(GL_QUADS);
	glColor3d(1.0f, 0, 1);
    glVertex3d(4, 2, 0);
    glVertex3d(6, 2, 0);
    glVertex3d(6, -3, 0);
    glVertex3d(4, -3, 0);
    glEnd();

   if(keys[VK_RIGHT])//->>JIKA TEKAN TOMBOL KANAN
   {
     glTranslatef(1.0f,0.0f,0.0f);
	 glBegin(GL_QUADS);
	 glColor3d(0, 0, 0);
     glVertex3d(-5, -1, 0);
     glVertex3d(-4, -1, 0);
     glVertex3d(-4, -3, 0);
     glVertex3d(-5, -3, 0);
     glEnd();
   }
   else
   {
     glBegin(GL_QUADS);
     glColor3d(0, 0, 0);
     glVertex3d(-6, -1, 0);
     glVertex3d(-5, -1, 0);
     glVertex3d(-5, -3, 0);
     glVertex3d(-6, -3, 0);
     glEnd();
   }
   // Increase The Rotation Variable For The Triangle ( NEW )
    // Show the new scene
    SwapBuffers(hDC);	
}

it’s not walk,it’s just change place from one point to another and return back when i release VK_RIGHT keyup.i want to know how the object can walk?

4

Do you understand the concept of a variable?
The code you posted has no variables in it - only numbers.
You’ll need to use variables to accomplish your objective in a reasonable manner.
Look at NeHe OpenGL Tutorial #4.
It shows how to use variables to rotate an object.
What you want to do is use a variable to translate an object.