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Quellcode

#include <cstdio> 
#include <conio.h> 
#include <windows.h> 

const int KEY_UP = 0x48; 
const int KEY_DOWN = 0x50; 
const int KEY_LEFT = 0x4b; 
const int KEY_RIGHT = 0x4d; 
const int KEY_ESCAPE = 0x1b; 

const int CONSOLE_WIDTH = 80; 
const int CONSOLE_HEIGHT = 25; 

enum color 
{ 
black, 
darkblue, 
darkgreen, 
darkcyan, 
darkred, 
darkpurple, 
darkgray, 
darkwhite, 
gray, 
blue, 
green, 
cyan, 
red, 
purple, 
yellow, 
white 
}; 

//////////////////////////////////////////////////////////////////// 
// sets the cursor position 
//////////////////////////////////////////////////////////////////// 
void gotoxy(int x, int y) 
{ 
COORD point; 
point.X = x; 
point.Y = y; 
SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), point); 
} 

//////////////////////////////////////////////////////////////////// 
// clears the screen 
//////////////////////////////////////////////////////////////////// 
void clrscr() 
{ 
CONSOLE_SCREEN_BUFFER_INFO csbi; 
DWORD bufferSize, charsWritten; 

COORD topleft = {0, 0}; 
HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE); 

GetConsoleScreenBufferInfo(hConsole, &csbi); 
bufferSize = csbi.dwSize.X * csbi.dwSize.Y; 
FillConsoleOutputCharacter(hConsole, TEXT(' '), bufferSize, topleft, &charsWritten); 
GetConsoleScreenBufferInfo(hConsole, &csbi); 
FillConsoleOutputAttribute(hConsole, csbi.wAttributes, bufferSize, topleft, &charsWritten); 
SetConsoleCursorPosition(hConsole, topleft); 
} 

//////////////////////////////////////////////////////////////////// 
// sets foreground and background color 
//////////////////////////////////////////////////////////////////// 
void setcolor(int colorBack, int colorFore) 
{ 
int back = 0; 
if (colorBack & 1) back |= BACKGROUND_BLUE; 
if (colorBack & 2) back |= BACKGROUND_GREEN; 
if (colorBack & 4) back |= BACKGROUND_RED; 
if (colorBack & 8) back |= BACKGROUND_INTENSITY; 

int fore = 0; 
if (colorFore & 1) fore |= FOREGROUND_BLUE; 
if (colorFore & 2) fore |= FOREGROUND_GREEN; 
if (colorFore & 4) fore |= FOREGROUND_RED; 
if (colorFore & 8) fore |= FOREGROUND_INTENSITY; 

SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), back | fore); 
} 


//////////////////////////////////////////////////////////////////// 
// clamps a value between min/max 
//////////////////////////////////////////////////////////////////// 
template<typename T> 
T clamp(const T& min, const T& max, const T& value) 
{ 
return (value < min ? min : value > max ? max : value); 
} 


//////////////////////////////////////////////////////////////////// 
// draws a message centered 
//////////////////////////////////////////////////////////////////// 
void centerText(const char *message, int ypos) 
{ 
int len = strlen(message); 
if (len > 0) 
{ 
int xpos = (CONSOLE_WIDTH - len) / 2; 
gotoxy(xpos, ypos); 
printf(message); 
} 
} 

int main() 
{ 
bool exit = false; 
int x = 0; 
int y = 0; 

do 
{ 
setcolor(darkblue, yellow); 
centerText("use arrow keys to move or escape to exit...", CONSOLE_HEIGHT-1); 

setcolor(black, green); 
gotoxy(x, y); 
printf("@"); 

int key = _getch(); 
if (!key || key == 0xe0) 
key = _getch(); 

switch (key) 
{ 
case KEY_LEFT: --x; break; 
case KEY_RIGHT: ++x; break; 
case KEY_UP: --y; break; 
case KEY_DOWN: ++y; break; 
case KEY_ESCAPE: exit = true; break; 
} 

x = clamp(0, CONSOLE_WIDTH-1, x); 
y = clamp(0, CONSOLE_HEIGHT-2, y); 

clrscr(); 

} while (!exit); 
}