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% notcurses_lines(3)
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% nick black <nickblack@linux.com>
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% v2.3.2
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# NAME
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notcurses_lines - operations on lines and boxes
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# SYNOPSIS
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**#include <notcurses/notcurses.h>**
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**int ncplane_hline_interp(struct ncplane* ***n***, const nccell* ***c***, int ***len***, uint64_t ***c1***, uint64_t ***c2***);**
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**static inline int ncplane_hline(struct ncplane* ***n***, const nccell* ***c***, int ***len***);**
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**int ncplane_vline_interp(struct ncplane* ***n***, const nccell* ***c***, int ***len***, uint64_t ***c1***, uint64_t ***c2***);**
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**static inline int ncplane_vline(struct ncplane* ***n***, const nccell* ***c***, int ***len***);**
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```c
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#define NCBOXMASK_TOP 0x0001
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#define NCBOXMASK_RIGHT 0x0002
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#define NCBOXMASK_BOTTOM 0x0004
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#define NCBOXMASK_LEFT 0x0008
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#define NCBOXGRAD_TOP 0x0010
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#define NCBOXGRAD_RIGHT 0x0020
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#define NCBOXGRAD_BOTTOM 0x0040
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#define NCBOXGRAD_LEFT 0x0080
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#define NCBOXCORNER_MASK 0x0300
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#define NCBOXCORNER_SHIFT 8u
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```
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**int ncplane_box(struct ncplane* ***n***, const nccell* ***ul***, const nccell* ***ur***, const nccell* ***ll***, const nccell* ***lr***, const nccell* ***hline***, const nccell* ***vline***, int ***ystop***, int ***xstop***, unsigned ***ctlword***);**
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**static inline int ncplane_box_sized(struct ncplane* ***n***, const nccell* ***ul***, const nccell* ***ur***, const nccell* ***ll***, const nccell* ***lr***, const nccell* ***hline***, const nccell* ***vline***, int ***ylen***, int ***xlen***, unsigned ***ctlword***);**
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**static inline int ncplane_perimeter(struct ncplane* ***n***, const nccell* ***ul***, const nccell* ***ur***, const nccell* ***ll***, const nccell* ***lr***, const nccell* ***hline***, const nccell* ***vline***, unsigned ***ctlword***)**
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**static inline int nccells_load_box(struct ncplane* ***n***, uint32_t ***styles***, uint64_t ***channels***, nccell* ***ul***, nccell* ***ur***, nccell* ***ll***, nccell* ***lr***, nccell* ***hl***, nccell* ***vl***, const char* ***gclusters***);**
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**static inline int nccells_rounded_box(struct ncplane* ***n***, uint32_t ***styles***, uint64_t ***channels***, nccell* ***ul***, nccell* ***ur***, nccell* ***ll***, nccell* ***lr***, nccell* ***hl***, nccell* ***vl***);**
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**static inline int ncplane_rounded_box(struct ncplane* ***n***, uint32_t ***styles***, uint64_t ***channels***, int ***ystop***, int ***xstop***, unsigned ***ctlword***);**
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**static inline int ncplane_rounded_box_sized(struct ncplane* ***n***, uint32_t ***styles***, uint64_t ***channels***, int ***ylen***, int ***xlen***, unsigned ***ctlword***);**
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**static inline int nccells_double_box(struct ncplane* ***n***, uint32_t ***styles***, uint64_t ***channels***, nccell* ***ul***, nccell* ***ur***, nccell* ***ll***, nccell* ***lr***, nccell* ***hl***, nccell* ***vl***);**
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**static inline int ncplane_double_box(struct ncplane* ***n***, uint32_t ***styles***, uint64_t ***channels***, int ***ystop***, int ***xstop***, unsigned ***ctlword***);**
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**static inline int ncplane_double_box_sized(struct ncplane* ***n***, uint32_t ***styles***, uint64_t ***channels***, int ***ylen***, int ***xlen***, unsigned ***ctlword***);**
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**int ncplane_polyfill_yx(struct ncplane* ***n***, int ***y***, int ***x***, const nccell* ***c***);**
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**int ncplane_gradient(struct ncplane* ***n***, const char* ***egc***, uint32_t ***stylemask***, uint64_t ***ul***, uint64_t ***ur***, uint64_t ***ll***, uint64_t ***lr***, int ***ystop***, int ***xstop***);**
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**static inline int ncplane_gradient_sized(struct ncplane* ***n***, const char* ***egc***, uint32_t ***stylemask***, uint64_t ***ul***, uint64_t ***ur***, uint64_t ***ll***, uint64_t ***lr***, int ***ylen***, int ***xlen***);**
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**int ncplane_highgradient(struct ncplane* ***n***, uint32_t ***ul***, uint32_t ***ur***, uint32_t ***ll***, uint32_t ***lr***, int ***ystop***, int ***xstop***);**
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**int ncplane_highgradient_sized(struct ncplane* ***n***, uint32_t ***ul***, uint32_t ***ur***, uint32_t ***ll***, uint32_t ***lr***, int ***ylen***, int ***xlen***);**
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**int ncplane_format(struct ncplane* ***n***, int ***ystop***, int ***xstop***, uint32_t ***stylemask***);**
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**int ncplane_stain(struct ncplane* ***n***, int ***ystop***, int ***xstop***, uint64_t ***ul***, uint64_t ***ur***, uint64_t ***ll***, uint64_t ***lr***);**
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# DESCRIPTION
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**ncplane_format** sets the attributes of every cell in the region having its
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upper-left corner at the cursor's current position, and its lower-right corner
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at **ystop**, **xstop**.
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Box- and line-drawing is unaffected by a plane's scrolling status.
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# RETURN VALUES
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**ncplane_format** returns -1 if either **ystop** or **xstop** is less than the
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current equivalent position, otherwise 0.
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# SEE ALSO
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**notcurses(3)**,
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**notcurses_cell(3)**,
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**notcurses_plane(3)**
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