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Код

#include <windows.h>
#include <windowsx.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

HINSTANCE hI;

int __stdcall WinMain(HINSTANCE hInst,HINSTANCE,LPSTR,int)
{
    MSG msg;
    WNDCLASS wc;

    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hbrBackground = GetStockBrush(WHITE_BRUSH);
    wc.hCursor = LoadCursor(NULL,IDC_ARROW);
    wc.hIcon = LoadIcon(NULL,IDI_APPLICATION);
    wc.hInstance = hInst;
    wc.lpfnWndProc = WndProc;
    wc.lpszClassName = "Graph";
    wc.lpszMenuName = NULL;
    wc.style = CS_HREDRAW | CS_VREDRAW;
    RegisterClass(&wc);

    hI = hInst;

    HWND hwnd = CreateWindow("Graph","Graph",WS_OVERLAPPEDWINDOW | WS_HSCROLL,CW_USEDEFAULT,0,CW_USEDEFAULT,0,NULL,NULL,hInst,NULL);
    ShowWindow(hwnd,SW_NORMAL);
    UpdateWindow(hwnd);

    while(GetMessage(&msg,NULL,0,0))
        DispatchMessage(&msg);

    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
    static int HorizPos = 0;
    static int HorizDif = 600;

    switch(msg) {
        case WM_CREATE:
            SetScrollRange(hwnd,SB_HORZ,0,100,TRUE);
            break;
        case WM_PAINT:
            PAINTSTRUCT ps;
            BeginPaint(hwnd,&ps);
            LineTo(ps.hdc,40,40);
            LineTo(ps.hdc,100,60);
            LineTo(ps.hdc,250,25);
            LineTo(ps.hdc,650,85);
            LineTo(ps.hdc,850,105);
            LineTo(ps.hdc,1100,500);
            EndPaint(hwnd,&ps);
            break;
        case WM_DESTROY:
            PostQuitMessage(0);
            break;
        case WM_HSCROLL:
            switch(LOWORD(wParam))
            {
            case SB_LINEDOWN:
                if(HorizPos < HorizDif)
                    HorizPos++;
            break;

            case SB_LINEUP:
                if(HorizPos > 0)
                    HorizPos--;
            break;

            case SB_THUMBTRACK:
                HorizPos = HIWORD(wParam);
                break;
            }
            SetScrollPos(hwnd,SB_HORZ,HorizPos,TRUE);
            InvalidateRect(hwnd,NULL,TRUE);
            break;
        default: return DefWindowProc(hwnd,msg,wParam,lParam);
    }

    return 0;
}