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ncplot: implement exponential plots #470

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nick black 2020-05-09 13:10:59 -04:00 committed by Nick Black
parent dd9f8254df
commit 19121e91f1
1 changed files with 10 additions and 5 deletions
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15
src/lib/cpp.h
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@ -127,14 +127,14 @@ class ncppplot {
ncplane_dim_yx(ncp, &dimy, &dimx);
const int scaleddim = dimx * scale;
// each transition is worth this much change in value
const size_t states = geomdata[gridtype].height - 1;
const size_t states = geomdata[gridtype].height;
// FIXME can we not rid ourselves of this meddlesome double? either way, the
// interval is one row's range (for linear plots), or the log10 of each row's
// range (for exponential plots).
double interval;
if(exponentiali){
if(maxy > miny){
interval = pow(maxy - miny, (double)1 / (dimy * states));
interval = pow(maxy - miny, (double)1 / ((dimy - 1) * states));
}else{
interval = 0;
}
@ -150,7 +150,7 @@ class ncppplot {
for(int y = 0 ; y < dimy ; ++y){
char buf[PREFIXSTRLEN + 1];
if(exponentiali){
ncmetric(pow(interval, (y + 1) * states) * 100, 100, buf, 0, 1000, '\0');
ncmetric(pow(interval, y * states) * 100, 100, buf, 0, 1000, '\0');
}else{
ncmetric(interval * states * (y + 1) * 100, 100, buf, 0, 1000, '\0');
}
@ -195,7 +195,8 @@ class ncppplot {
for(int i = 0 ; i < scale ; ++i){
sumidx *= states;
if(intervalbase < gvals[i]){
egcidx = (gvals[i] - intervalbase) / interval;
egcidx = (log(gvals[i]) - log(intervalbase)) * states / interval;
//fprintf(stderr, "egcidx: %zu\n", egcidx);
if(egcidx >= states){
egcidx = states - 1;
}
@ -211,7 +212,11 @@ class ncppplot {
if(ncplane_putwc_yx(ncp, dimy - y - 1, x, egc[sumidx]) <= 0){
return -1;
}
intervalbase += (states * interval);
if(exponentiali){
intervalbase = miny + pow(interval, y * states);
}else{
intervalbase += (states * interval);
}
}
}
if(ncplane_cursor_move_yx(ncp, 0, 0)){