/*
    ssaver.cpp - simpliest screensaver. 
    Especially for "MyComputer" readers :-)
    -------------------------------------
    Programmed by Ivan Gavrilyuk on Aug, 2002
    mailto: ivg@hotbox.ru
    best chat: http://chat.chat.ru, channel "Programmers" :-)
*/

#include <windows.h>
#include <scrnsave.h>
#include <math.h>

double pi = 3.1415926;
double pi2 = 2*pi;
double hpi = pi/2;

//screensaver message cycle. Works like WinMain in clean Win32API application
LRESULT WINAPI ScreenSaverProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    static PAINTSTRUCT ps = {NULL};
    static HDC hDC = NULL;
    static HPEN hPen1;
    static UINT uTimer = 0;
    static int x_max, y_max;
    static double step = 0.01, angle = 0;
    static int center_x, center_y;

    switch(message)
    {
    case WM_CREATE:
        x_max = GetSystemMetrics(SM_CXSCREEN);
        y_max = GetSystemMetrics(SM_CYSCREEN);
        center_x = x_max / 2;
        center_y = y_max / 2;
        uTimer = SetTimer(hWnd, 1, 10, NULL);
        hPen1 = (HPEN)GetStockObject(WHITE_PEN);
        break;

    case WM_DESTROY:
        if(uTimer) KillTimer(hWnd, uTimer);
        PostQuitMessage(0);
        break;

    case WM_TIMER:
        angle += step;
        if(angle > pi2) angle = 0;

        RECT lpr;
        lpr.left = center_x - 102;
        lpr.top = center_y - 102;
        lpr.right = center_x + 102;
        lpr.bottom = center_y + 102;;
        InvalidateRect(hWnd, &lpr, true);
        break;

    case WM_PAINT:
        x_max = GetSystemMetrics(SM_CXSCREEN);
        y_max = GetSystemMetrics(SM_CYSCREEN);
        center_x = x_max / 2;
        center_y = y_max / 2;
        
        hDC = BeginPaint(hWnd, &ps);
        
        if(fChildPreview)
        {
            SetBkColor(hDC, RGB(0, 0, 0));
            SetTextColor(hDC, RGB(255, 255, 0));
            char szPreview[] = "Мои квадратики :-)";
            TextOut(hDC, 15, 45, szPreview, strlen(szPreview));
        }
        else
        {
            SetBkColor(hDC, RGB(1, 0, 0));
            SetTextColor(hDC, RGB(120, 120, 120));

            SelectObject(hDC, hPen1);
            MoveToEx(hDC, center_x + (int)(cos(angle)*(double)100), center_y + (int)(sin(angle)*(double)(-100)), NULL);
            LineTo(hDC, center_x + (int)(cos(hpi + angle)*(double)100), center_y + (int)(sin(hpi + angle)*(double)(-100)));
            LineTo(hDC, center_x + (int)(cos(pi + angle)*(double)100), center_y + (int)(sin(pi + angle)*(double)(-100)));
            LineTo(hDC, center_x + (int)(cos(hpi + pi + angle)*(double)100), center_y + (int)(sin(hpi + pi + angle)*(double)(-100)));
            LineTo(hDC, center_x + (int)(cos(angle)*(double)100), center_y + (int)(sin(angle)*(double)(-100)));

            MoveToEx(hDC, center_x + (int)(cos(-angle)*(double)50), center_y + (int)(sin(-angle)*(double)(-50)), NULL);
            LineTo(hDC, center_x + (int)(cos(hpi - angle)*(double)50), center_y + (int)(sin(hpi - angle)*(double)(-50)));
            LineTo(hDC, center_x + (int)(cos(pi - angle)*(double)50), center_y + (int)(sin(pi - angle)*(double)(-50)));
            LineTo(hDC, center_x + (int)(cos(hpi + pi - angle)*(double)50), center_y + (int)(sin(hpi + pi - angle)*(double)(-50)));
            LineTo(hDC, center_x + (int)(cos(-angle)*(double)50), center_y + (int)(sin(-angle)*(double)(-50)));

            static char szAuthor[] = "Programmed by Evgeniy";
            TextOut(hDC, 0, y_max - 20, szAuthor, strlen(szAuthor));
        }
        
        EndPaint(hWnd, &ps);
        break;

    default: 
        return DefScreenSaverProc(hWnd, message, wParam, lParam);
    }

    return 0;
}

BOOL WINAPI ScreenSaverConfigureDialog (HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    return true;
}

BOOL WINAPI RegisterDialogClasses (HANDLE hInst)
{
    return true;
}

//That's all, folks!