C / C++ / MFC

#include <windows.h>
COLORREF color[17][7];


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

int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine, int nCmdShow )
{
    MSG  msg ;
    HWND hwnd;
    WNDCLASS wc;

    wc.style         = CS_HREDRAW | CS_VREDRAW;
    wc.cbClsExtra    = 0;
    wc.cbWndExtra    = 0;
    wc.lpszClassName = TEXT( "Window" );
    wc.hInstance     = hInstance ;
    wc.hbrBackground = GetSysColorBrush(COLOR_INACTIVECAPTIONTEXT);
    wc.lpszMenuName  = NULL;
    wc.lpfnWndProc   = WndProc;
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);

    RegisterClass(&wc);
    hwnd = CreateWindow( wc.lpszClassName,TEXT("BOXES"), WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                        100, 100, 800, 800, NULL, NULL,
                        hInstance,
                        NULL);

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    while( GetMessage(&msg, NULL, 0, 0))
    {
       TranslateMessage(&msg);
       DispatchMessage(&msg);
    }
    return msg.wParam;
}

LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    int i_row, j_column;

    switch (msg)
    {

    case WM_CREATE:
    {
       for(i_row=0; i_row<17; i_row++)
       {
           for(j_column=0; j_column<7; j_column++)
           {
               color[i_row][j_column]=RGB(255,255,255);
           }
       }
       break;
    }

    case WM_PAINT:
    {
        HDC hdc;
        PAINTSTRUCT ps;
        HPEN hPen,holdPen;
        HBRUSH hBrush_1, holdBrush;
       hdc = BeginPaint(hwnd, &ps);

       //create a pen and hold it here for a solid fill
       hPen = CreatePen(PS_NULL, 1, RGB(0, 0, 0));
       holdPen = SelectObject(hdc, hPen);

       for(i_row=0; i_row<17; i_row++)
       {
           for(j_column=0; j_column<7; j_column++)
           {
               hBrush_1 = CreateSolidBrush(color[i_row][j_column]);
               holdBrush = SelectObject(hdc, hBrush_1);
               Rectangle(hdc, 90*j_column+100, 50+30*i_row, 90*j_column+180, 30*i_row+75); //rember is x, y, x, y

           }
       }

       DeleteDC(hdc);

       DeleteObject(hPen);
       DeleteObject(holdPen);
       DeleteObject(hBrush_1);
       DeleteObject(holdBrush);

       EndPaint(hwnd, &ps);
       break;

    }
       break;

    case WM_DESTROY:
    {
       PostQuitMessage(0);
       return 0;
    }
    }
    return DefWindowProc(hwnd, msg, wParam, lParam);
}