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plots: implement update_sample()

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nick black 2020-04-03 04:40:19 -04:00 committed by Nick Black
parent 5bccf6b446
commit e8a4badf8b
1 changed files with 16 additions and 0 deletions
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16
src/lib/plot.c
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@ -92,6 +92,18 @@ window_slide(ncplot* n, uint64_t x){
return 0;
}
// x must be within n's window
static inline void
update_sample(ncplot* n, uint64_t x, int64_t y, bool reset){
uint64_t delta = x - n->slotx;
uint64_t idx = (n->slotstart + delta) % n->slotcount;
if(reset){
n->slots[idx] = y;
}else{
n->slots[idx] += y;
}
}
// Add to or set the value corresponding to this x. If x is beyond the current
// x window, the x window is advanced to include x, and values passing beyond
// the window are lost. The first call will place the initial window. The plot
@ -103,6 +115,8 @@ int ncplot_add_sample(ncplot* n, uint64_t x, int64_t y){
if(window_slide(n, x)){
return -1;
}
update_sample(n, x, y, false);
// FIXME redraw plot
return 0;
}
@ -113,6 +127,8 @@ int ncplot_set_sample(ncplot* n, uint64_t x, int64_t y){
if(window_slide(n, x)){
return -1;
}
update_sample(n, x, y, true);
// FIXME redraw plot
return 0;
}