#include <windows.h>
#include <scrnsave.h>
#include <tchar.h>
#include "resource.h"

Include dependency graph for circles.c:

Macros
#define	RANDOM_COLOR (rand () % 256)

#define	APPNAME _T("Circles")

#define	APP_TIMER 1

#define	APP_TIMER_INTERVAL 100

#define	MAX_CIRCLES 50

Functions
LRESULT WINAPI	ScreenSaverProc (HWND hwnd, UINT iMsg, WPARAM wparam, LPARAM lparam)

BOOL WINAPI	ScreenSaverConfigureDialog (HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)

BOOL WINAPI	RegisterDialogClasses (HANDLE hInst)

Variables
int	circlesCount

int	width

int	x

int	y

Macro Definition Documentation

◆ APP_TIMER

#define APP_TIMER 1

Definition at line 27 of file circles.c.

◆ APP_TIMER_INTERVAL

#define APP_TIMER_INTERVAL 100

Definition at line 28 of file circles.c.

◆ APPNAME

#define APPNAME _T("Circles")

Definition at line 26 of file circles.c.

◆ MAX_CIRCLES

#define MAX_CIRCLES 50

Definition at line 29 of file circles.c.

◆ RANDOM_COLOR

#define RANDOM_COLOR (rand () % 256)

Definition at line 24 of file circles.c.

Function Documentation

◆ RegisterDialogClasses()

BOOL WINAPI RegisterDialogClasses ( HANDLE hInst )

Definition at line 99 of file circles.c.

{
    TCHAR szMessage[256];
    TCHAR szTitle[25];
 
    LoadString(hInst, IDS_TEXT, szMessage, sizeof(szMessage) / sizeof(TCHAR));
    LoadString(hInst, IDS_DESCRIPTION, szTitle, sizeof(szTitle) / sizeof(TCHAR));
 
    MessageBox(NULL, szMessage, szTitle, MB_OK | MB_ICONEXCLAMATION);
 
    return FALSE;
}

◆ ScreenSaverConfigureDialog()

BOOL WINAPI ScreenSaverConfigureDialog	(	HWND	hDlg,
		UINT	uMsg,
		WPARAM	wParam,
		LPARAM	lParam
	)

Definition at line 92 of file circles.c.

{
    return FALSE;
}

◆ ScreenSaverProc()

LRESULT WINAPI ScreenSaverProc	(	HWND	hwnd,
		UINT	iMsg,
		WPARAM	wparam,
		LPARAM	lparam
	)

Definition at line 34 of file circles.c.

{
    HDC hdc;
    RECT rect;
    HBRUSH hbrush, hbrushOld;
 
    switch (iMsg)
    {
        case WM_CREATE:
            SetTimer (hwnd, APP_TIMER, APP_TIMER_INTERVAL, NULL);
            break;
 
        case WM_DESTROY:
            KillTimer (hwnd, APP_TIMER);
            PostQuitMessage (0);
            return 0;
 
        case WM_TIMER:
            hdc = GetDC (hwnd);
            GetClientRect (hwnd, &rect);
            hbrush = CreateSolidBrush (RGB (RANDOM_COLOR, RANDOM_COLOR, RANDOM_COLOR));
            hbrushOld = SelectObject (hdc, hbrush);
 
            x = rand () % rect.right;
            y = rand () % rect.bottom;
 
            /* the circle will be 10% of total screen */
            width = rect.right / 10;
            if (rect.bottom / 10 < width)
                width = rect.bottom / 10;
 
            /* Draw circle on screen */
            Ellipse (
                hdc,
                x,
                y,
                x + width,
                y + width);
 
            //Track the number of painted circles on scren
            circlesCount++;
            if (circlesCount == MAX_CIRCLES)
            {
                InvalidateRect (hwnd, NULL, TRUE);
                circlesCount = 0;
            }
 
            SelectObject (hdc, hbrushOld);
            DeleteObject (hbrush);
            ReleaseDC (hwnd, hdc);
 
            return 0;
    }
 
    return DefScreenSaverProc (hwnd, iMsg, wparam, lparam);
}