curs_clear: erase, werase, clear, wclear, clrtobot, wclrtobot, clrtoeol,
wclrtoeol - clear all or part of a curses window
# include <curses.h>
int werase(WINDOW *win);
int wclear(WINDOW *win);
int wclrtobot(WINDOW *win);
int wclrtoeol(WINDOW *win);
The erase and werase routines copy blanks to every position in the
The clear and wclear routines are like erase and werase, but they also
call clearok, so that the screen is cleared completely on the next call
to wrefresh for that window and repainted from scratch.
The clrtobot and wclrtobot routines erase all lines below the cursor in
the window. Also, the current line to the right of the cursor,
inclusive, is erased.
The clrtoeol and wclrtoeol routines erase the current line to the right
of the cursor, inclusive.
All routines return the integer OK, or a non-negative integer if immedok
The header file <curses.h> automatically includes the header files
<stdio.h> and <unctrl.h>.
Note that erase, werase, clear, wclear, clrtobot, and clrtoeol may be
curses(3X), curs_outopts(3X), curs_refresh(3X)
clear - clears the viewport
clear sets the bitplane area of the viewport to the current color.
Multiple bitplane buffers can be cleared simultaneously using the
backbuffer, frontbuffer, and zdraw commands. Current polygon fill
pattern and writemask affect the operation of clear. The screen mask,
when it is set to a subregion of the viewport, bounds the cleared region.
Alpha function, blend function, logical operation, stenciling, texture
mapping, and z buffering, however, are ignored by clear. Stencil and z
buffer contents are not affected by clear (except in the special case of
Like other drawing commands, clear operates on the currently active
framebuffer, one of normal, popup, overlay, or underlay, based on the
current draw mode (see drawmode).
After clear executes, the graphics position is undefined.
afunction, backbuffer, blendfunction, czclear, defpattern, drawmode,
frontbuffer, logicop, scrmask, setpattern, stencil, texbind, zbuffer,
On the IRIS-4D B, G, GT, GTX, and VGX models, clear runs faster when the
window is completely unobscured.
On the Personal Iris, XS, XS24, XZ, Elan and Extreme systems, clear runs
faster when the visible window area consists of four or fewer rectangular
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