The statement directs NCurses to use the terminfo database s values for the current screen size. in Java

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Example
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use_env(FALSE);
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The statement directs NCurses to use the terminfo database s values for the current screen size.
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Sample Program
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 #include <ncurses.h> int main(void) { use_env(FALSE); initscr(); printw( LINES = %d\n ,LINES); printw( COLS = %d\n ,COLS); refresh(); getch(); endwin(); return 0; }
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Sample output:
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LINES = 24 COLS = 80
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Appendix A
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NCurses Library Reference
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Also See
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initscr(), LINES, COLS
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vline()
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The vline() function draws a vertical (up-down) line from the cursor s current location down a given number of rows.
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Man Page Format
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int int int int vline(chtype ch, int n); wvline(WINDOW *win, chtype ch, int n); mvvline(int y, int x, chtype ch, int n); mvwvline(WINDOW *, int y, int x, chtype ch, int n);
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Format Reference
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ch is a chtype character used to draw the line. Though typically only a single character, such as |, is used, you can combine characters, text attributes and colors with the chtype variable. Refer to Appendix C. When zero is specified for ch, the default ASC_VLINE character is used. See Appendix B for more information on ACS characters. n is an int value that sets the length of the line in rows. Valid values for n range from 0 on up to whatever an integer can hold. When n is zero no line is displayed. When n is greater than the distance between the current cursor position and the bottom of the window, then only as many ch characters as can be displayed are shown. (Long vertical lines will not cause the screen to scroll, nor will the line wrap in any way.) Refer to the mv, mvw, and w prefix entries elsewhere in this appendix for information on the win, row, and col arguments.
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Return Value
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vline() always returns OK.
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Notes
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The line always goes from the cursor s current position down. Drawing the line does not affect the cursor s location. The cursor remains at its previous location or whichever location was set by the mvvline() or mvwvline() functions.
Appendix A
NCurses Library Reference
The line drawn is not protected against erasure by other NCurses text output functions; the line can be overwritten at any time.
Examples
vline(0,10);
The function draws a line 10 characters long (tall) from the cursor s current position. The default line drawing character is used.
mvvline(y,10, * ,len);
Here, the function draws a vertical line using asterisks. The line is len characters long from location row y, column 10.
Sample Program
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 #include <ncurses.h> int main(void) { int maxy,maxx,halfy,x,len; initscr(); getmaxyx(stdscr,maxy,maxx); halfy = maxy >> 1; len = 1;
/* y/2 */
for(x=0;x<maxx;x++) { mvvline(halfy-len,x,0,len+len); if( !(x % 7)) len++; } refresh(); getch(); endwin(); return 0; }
The sample output is shown in Figure A-16.
Also See
14, Appendix B, box(), hline()
Appendix A
NCurses Library Reference
Figure A-16: The vline() function draws a, well, modern art-like thing on the terminal.
vwprintw()
See printw().
vwscanw()
See scanw().
w prefix functions
This appendix lists NCurses pseudo functions. Internally, most NCurses functions come with the w prefix, which means that the function initially specifies a window argument. This entry covers the common information shared by all w prefix functions; refer elsewhere for the function specifics.
Format
All w prefix functions feature win as their first argument. win is a WINDOW variable, representing a window created earlier in the program. Refer to the individual functions elsewhere in this appendix for information on the other arguments listed.
Appendix A
NCurses Library Reference
Notes
The WINDOW variable always comes first in those functions that require it. Even with the mvw prefix, win comes first (then the screen coordinates). The argument win is a WINDOW pointer variable, but do not prefix it with the & operator. The pseudo functions are macros defined as their w-prefix counterparts with the stdscr, standard screen, argument used for the window.
Also See
addch(), addchstr(), addstr(), and so on
wcursyncup()
The wcursyncup() function sets the cursor position for all ancestors of a window equal to the cursor position in the named window.