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update docs for ncplane_box() #42

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nick black 2019-12-04 03:56:27 -05:00 committed by Nick Black
parent b711eaeedd
commit 1b714e16d8
1 changed files with 27 additions and 4 deletions
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README.md
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@ -332,9 +332,31 @@ int ncplane_vline(struct ncplane* n, const cell* c, int len);
// Draw a box with its upper-left corner at the current cursor position, and its
// lower-right corner at 'ystop'x'xstop'. The 6 cells provided are used to draw the
// upper-left, ur, ll, and lr corners, then the horizontal and vertical lines.
int ncplane_box(struct ncplane* n, const cell* ul, const cell* ur,
// 'ctlword' is defined in the least significant byte, where bits [7, 4] are a
// gradient mask, and [3, 0] are a border mask:
// * 7, 3: top
// * 6, 2: right
// * 5, 1: bottom
// * 4, 0: left
// if the gradient bit is not set, the styling from the hl/vl cells is used for
// the horizontal and vertical lines, respectively. if the gradient bit is set,
// the color is linearly interpolated between the two relevant corner cells. if
// the bordermask bit is set, that side of the box is not drawn. iff either edge
// connecting to a corner is drawn, the corner is drawn.
#define NCBOXMASK_TOP 0x01
#define NCBOXMASK_RIGHT 0x02
#define NCBOXMASK_BOTTOM 0x04
#define NCBOXMASK_LEFT 0x08
#define NCBOXGRAD_TOP 0x10
#define NCBOXGRAD_RIGHT 0x20
#define NCBOXGRAD_BOTTOM 0x40
#define NCBOXGRAD_LEFT 0x80
API int ncplane_box(struct ncplane* n, const cell* ul, const cell* ur,
const cell* ll, const cell* lr, const cell* hline,
const cell* vline, int ystop, int xstop);
const cell* vline, int ystop, int xstop,
unsigned ctlword);
// Draw a box with its upper-left corner at the current cursor position, having
// dimensions 'ylen'x'xlen'. See ncplane_box() for more information. The
@ -342,10 +364,11 @@ int ncplane_box(struct ncplane* n, const cell* ul, const cell* ur,
static inline int
ncplane_box_sized(struct ncplane* n, const cell* ul, const cell* ur,
const cell* ll, const cell* lr, const cell* hline,
const cell* vline, int ylen, int xlen){
const cell* vline, int ylen, int xlen, unsigned ctlword){
int y, x;
ncplane_cursor_yx(n, &y, &x);
return ncplane_box(n, ul, ur, ll, lr, hline, vline, y + ylen - 1, x + xlen - 1);
return ncplane_box(n, ul, ur, ll, lr, hline, vline,
y + ylen - 1, x + xlen - 1, ctlword);
}
// Erase every cell in the ncplane, resetting all attributes to normal, all