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% notcurses_progbar(3)
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% nick black <nickblack@linux.com>
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% v2.0.11
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# NAME
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notcurses_progbar - high level widget for progress bars
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# SYNOPSIS
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**#include <notcurses/notcurses.h>**
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```c
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struct ncprogbar;
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#define NCPROGBAR_OPTION_RETROGRADE 0x0001u // proceed left/down
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typedef struct ncprogbar_options {
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uint64_t maxchannels;
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uint64_t minchannels;
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uint64_t flags;
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} ncprogbar_options;
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```
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**struct ncprogbar* ncprogbar_create(struct ncplane* ***n***, const ncprogbar_options* ***opts***)**
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**struct ncplane* ncprogbar_plane(struct ncprogbar* ***n***)**
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**int ncprogbar_set_progress(struct ncprogbar* ***n***, double ***p***)**
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**double ncprogbar_progress(const struct ncprogbar* ***n***)**
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**void ncprogbar_destroy(struct ncprogbar* ***n***)**
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# DESCRIPTION
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These functions draw progress bars in any of four directions. The progress
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measure is a **double** between zero and one, inclusive, provided to
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**ncprogbar_set_progress**. This will be scaled to the size of the provided
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ncplane ***n***. The axis of progression is the longer element of the plane's
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geometry. Horizontal bars proceed to the right by default, and vertical bars
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proceed up. This can be changed with **NCPROGBAR_OPTION_RETROGRADE**.
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# NOTES
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**ncprogbar_create** takes ownership of ***n*** in all cases. On failure,
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***n*** will be destroyed immediately. It is otherwise destroyed by
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**ncprogbar_destroy**.
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# RETURN VALUES
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**ncprogbar_plane** returns the **ncplane** on which the progress bar is drawn.
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**ncprogbar_progress** returns the current progress, a value between zero and
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one, inclusive. They cannot fail.
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**ncprogbar_set_progress** returns -1 if ***p*** is less than zero or greater
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than one, or if there is an internal error redrawing the progress bar. It
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returns 0 otherwise.
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# BUGS
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Whether progression is to the left or right by default probably ought be an
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aspect of the current locale.
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# SEE ALSO
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**notcurses(3)**,
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**notcurses_plane(3)**,
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**notcurses_visual(3)**
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