1 /*
2  *  Copyright 2008 Marc Piulachs (marc.piulachs@codexchange.net)
3  *
4  *  This program is free software; you can redistribute it and/or modify
5  *  it under the terms of the GNU General Public License as published by
6  *  the Free Software Foundation; either version 2 of the License, or
7  *  (at your option) any later version.
8  *
9  *  This program is distributed in the hope that it will be useful,
10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  *  GNU General Public License for more details.
13  *
14  *  You should have received a copy of the GNU General Public License
15  *  along with this program; if not, write to the Free Software
16  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
17  */
18 
19 #include <windows.h>
20 #include <scrnsave.h>
21 #include <tchar.h>
22 #include "resource.h"
23 
24 #define RANDOM_COLOR (rand () % 256)
25 
26 #define APPNAME              _T("Circles")
27 #define APP_TIMER            1
28 #define APP_TIMER_INTERVAL   100
29 #define MAX_CIRCLES          50
30 
31 int circlesCount;
32 int width, x, y;
33 
34 LRESULT WINAPI ScreenSaverProc (HWND hwnd, UINT iMsg, WPARAM wparam, LPARAM lparam)
35 {
36     HDC hdc;
37     RECT rect;
38     HBRUSH hbrush, hbrushOld;
39 
40     switch (iMsg)
41     {
42         case WM_CREATE:
43             SetTimer (hwnd, APP_TIMER, APP_TIMER_INTERVAL, NULL);
44             break;
45 
46         case WM_DESTROY:
47             KillTimer (hwnd, APP_TIMER);
48             PostQuitMessage (0);
49             return 0;
50 
51         case WM_TIMER:
52             hdc = GetDC (hwnd);
53             GetClientRect (hwnd, &rect);
54             hbrush = CreateSolidBrush (RGB (RANDOM_COLOR, RANDOM_COLOR, RANDOM_COLOR));
55             hbrushOld = SelectObject (hdc, hbrush);
56 
57             x = rand () % rect.right;
58             y = rand () % rect.bottom;
59 
60             /* the circle will be 10% of total screen */
61             width = rect.right / 10;
62             if (rect.bottom / 10 < width)
63                 width = rect.bottom / 10;
64 
65             /* Draw circle on screen */
66             Ellipse (
67                 hdc,
68                 x,
69                 y,
70                 x + width,
71                 y + width);
72 
73             //Track the number of painted circles on scren
74             circlesCount++;
75             if (circlesCount == MAX_CIRCLES)
76             {
77                 InvalidateRect (hwnd, NULL, TRUE);
78                 circlesCount = 0;
79             }
80 
81             SelectObject (hdc, hbrushOld);
82             DeleteObject (hbrush);
83             ReleaseDC (hwnd, hdc);
84 
85             return 0;
86     }
87 
88     return DefScreenSaverProc (hwnd, iMsg, wparam, lparam);
89 }
90 
91 
92 BOOL WINAPI ScreenSaverConfigureDialog(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
93 {
94     return FALSE;
95 }
96 
97 // This function is only called one time before opening the configuration dialog.
98 // Use it to show a message that no configuration is necesssary and return FALSE to indicate that no configuration dialog shall be opened.
99 BOOL WINAPI RegisterDialogClasses(HANDLE hInst)
100 {
101     TCHAR szMessage[256];
102     TCHAR szTitle[25];
103 
104     LoadString(hInst, IDS_TEXT, szMessage, sizeof(szMessage) / sizeof(TCHAR));
105     LoadString(hInst, IDS_DESCRIPTION, szTitle, sizeof(szTitle) / sizeof(TCHAR));
106 
107     MessageBox(NULL, szMessage, szTitle, MB_OK | MB_ICONEXCLAMATION);
108 
109     return FALSE;
110 }
111