gotoxy() function using printf() 's position
Solution 1
The order of x and y matters because the names of the variables have no meaning to the operation of the gotoxy() function.
That function is outputing a terminal command sequence that moves to the specified coordinates. When the terminal sees that command sequence and processes it, y is expected first.
By the way, be careful with this solution as this is highly dependent on the type of terminal within which the program is run. In order to get wide terminal support with random movement and "drawing" on a terminal screen, ncurses
or curses
are your best bet. They are challenging to learn at first though.
Solution 2
OP: "why the need to change the x y order".
The cursor position command's format is
Force Cursor Position <ESC>[{ROW};{COLUMN}f
The need arises because to match that format and have your y
variable as the ROW, y
comes first. (You could rotate your screen 90 degrees instead).
OP: why cursor does't go to second row when i = 1?
The home position, at the upper left of the screen is the Origin being line 1, column 1
Note: You can put the escape character in the format,
printf("\x1B[%d;%df", y, x);
fflush(stdout); // @jxh
Solution 3
The column and row positions do not start at 0 when using the terminal escape sequences. They start at 1.
You need to flush stdout
to see the cursor move.
void gotoxy(int x,int y)
{
printf("%c[%d;%df",0x1B,y,x);
fflush(stdout);
}
good5dog5
Updated on June 15, 2022Comments
-
good5dog5 almost 2 years
Hello there
i am working a project which need thegotoxy()
function
i have read gotoxy() implementation for Linux using printfi wonder why the
void gotoxy(int x,int y) { printf("%c[%d;%df",0x1B,y,x); }
need to change the x y order in printf, is that just to fit the coordinate system?
in my way, i change it toprintf("%c[%d;%df",0x1B,x,y)
to meet my needsstil, during my using this
gotoxy()
in for loop like this:for( int i = 0; i < 12; i++ ) { for( int j = 0; j < 12; j++ ) { gotoxy( i , j ); usleep(500000); } }
when i = 0 and i = 0, the cursor are on the first row
i wonder why cursor does't go to second row when i = 1? -
ryyker over 10 yearsshowing how
<ESC>[{ROW};{COLUMN}f
relates to the function brought the whole thing home for me.