mirror of
https://github.com/reactos/reactos.git
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227 lines
5.3 KiB
C
227 lines
5.3 KiB
C
/*
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* Copyright 2003 J Brown
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* Copyright 2006 Eric Kohl
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* Copyright 2007 Marc Piulachs (marc.piulachs@codexchange.net)
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* Copyright 2015 Daniel Reimer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <windows.h>
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#include <tchar.h>
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#include <scrnsave.h>
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#include "resource.h"
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#define RANDOM( min, max ) ((rand() % (int)(((max)+1) - (min))) + (min))
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#define MAX_LOADSTRING 100
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#define MAX_STARS 1000
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#define APPNAME _T("Starfield")
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#define APP_TIMER 1
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#define APP_TIMER_INTERVAL 20
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#define MAX_STARS 1000
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// Details of each individual star
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typedef struct star
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{
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int m_nXPos, m_nYPos, m_nZPos;
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int m_nOldX, m_nOldY;
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} STAR;
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STAR *stars;
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int m_nTotStars;
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int m_nCenterX, m_nCenterY;
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void DrawStarField (HDC pDC)
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{
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int nX, nY;
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int i;
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for (i = 0; i < m_nTotStars; i++)
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{
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// Clear last position of this star
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SetPixel (
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pDC,
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stars[i].m_nOldX,
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stars[i].m_nOldY,
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RGB (0, 0, 0));
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nX = (int)((((long)stars[i].m_nXPos << 7) / (long)stars[i].m_nZPos) + m_nCenterX);
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nY = (int)((((long)stars[i].m_nYPos << 7) / (long)stars[i].m_nZPos) + m_nCenterY);
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// Draw star
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SetPixel (
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pDC,
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nX,
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nY,
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RGB (255, 255, 255));
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// Remember current position for clearing later
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stars[i].m_nOldX = nX;
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stars[i].m_nOldY = nY;
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}
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}
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BOOL SetUpStars (int nNumStars)
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{
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int i;
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if (nNumStars > MAX_STARS)
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{
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MessageBox (0,
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_T("Too many stars! Aborting!"),
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_T("Error"),
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MB_OK | MB_ICONWARNING);
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return FALSE;
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}
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if (stars)
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free (stars);
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m_nTotStars = nNumStars;
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stars = (STAR*)malloc(nNumStars * sizeof(STAR));
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if (!stars)
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{
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MessageBox (0,
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_T("Unable to allocate memory! Aborting!"),
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_T("Error"),
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MB_OK | MB_ICONWARNING);
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return FALSE;
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}
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for (i = 0; i < m_nTotStars; i++)
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{
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do
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{
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stars[i].m_nXPos = RANDOM (-320, 320);
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stars[i].m_nYPos = RANDOM (-200, 200);
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stars[i].m_nZPos = i+1;
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stars[i].m_nOldX = -1;
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stars[i].m_nOldY = -1;
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} while ((stars[i].m_nXPos == 0) || (stars[i].m_nYPos == 0));
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}
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return TRUE;
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}
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void MoveStarField (int nXofs, int nYofs, int nZofs)
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{
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int i;
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for (i = 0; i < m_nTotStars; i++)
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{
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stars[i].m_nXPos += nXofs;
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stars[i].m_nYPos += nYofs;
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stars[i].m_nZPos += nZofs;
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if (stars[i].m_nZPos > m_nTotStars)
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stars[i].m_nZPos -= m_nTotStars;
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if (stars[i].m_nZPos < 1)
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stars[i].m_nZPos += m_nTotStars;
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}
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}
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void SetDimensions (int nWidth, int nHeight)
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{
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m_nCenterX = nWidth / 2;
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m_nCenterY = nHeight / 2;
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}
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LRESULT WINAPI ScreenSaverProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
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{
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static HDC pDC;
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switch (msg)
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{
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case WM_CREATE:
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{
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SetTimer (
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hwnd,
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APP_TIMER,
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APP_TIMER_INTERVAL,
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NULL);
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}
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break;
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case WM_PAINT:
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{
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PAINTSTRUCT PtStr;
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HDC pDC = BeginPaint (hwnd, &PtStr);
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DrawStarField (pDC);
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EndPaint (hwnd, &PtStr);
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SetUpStars(250);
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return (0);
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}
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break;
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case WM_TIMER:
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{
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if (wParam == APP_TIMER)
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{
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MoveStarField (0, 0, -3);
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pDC = GetDC(hwnd);
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DrawStarField (pDC);
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ReleaseDC(hwnd, pDC);
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}
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}
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break;
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case WM_SIZE:
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{
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// Change the center point of the starfield
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SetDimensions (
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LOWORD(lParam),
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HIWORD(lParam));
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}
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break;
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case WM_DESTROY:
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{
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KillTimer (hwnd, APP_TIMER);
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free(stars);
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ShowCursor(TRUE);
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PostQuitMessage (0);
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return 0;
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}
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break;
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default:
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return DefScreenSaverProc(hwnd, msg, wParam, lParam);
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}
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return 0;
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}
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BOOL WINAPI ScreenSaverConfigureDialog(HWND hWnd, UINT message, WPARAM wparam, LPARAM lparam)
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{
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return FALSE;
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}
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BOOL WINAPI RegisterDialogClasses(HANDLE hmodule)
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{
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TCHAR szTitle[256];
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TCHAR szText[256];
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LoadString(hmodule,
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IDS_TITLE,
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szTitle,
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256);
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LoadString(hmodule,
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IDS_TEXT,
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szText,
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256);
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MessageBox(0,
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szText,
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szTitle,
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MB_OK | MB_ICONWARNING);
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return FALSE;
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} |