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rrdtool1: modify logarithmic scale labelling

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The y-axis graph labels in logarithmic mode display in 'scientific'
notation eg: '1e+00' for 0, '1e+01' for 10, '1e+02' for 100 and so on.
This IMO is a pain in the backside for non scientific humans to read.

Modified output to display numbers up to 99,999 in conventional decimal
format and to revert to scientific notation for larger, thus the same
display space is taken.

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
This commit is contained in:
Kevin Darbyshire-Bryant 2020-04-26 21:10:43 +01:00 committed by Kevin Darbyshire-Bryant
parent d6caf776ae
commit edc41b26ab
2 changed files with 28 additions and 1 deletions
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2
utils/rrdtool1/Makefile
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@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=rrdtool1
PKG_VERSION:=1.0.50
PKG_RELEASE:=2
PKG_RELEASE:=3
PKG_BUILD_DIR:=$(BUILD_DIR)/rrdtool-$(PKG_VERSION)
PKG_SOURCE:=rrdtool-$(PKG_VERSION).tar.gz

27
utils/rrdtool1/patches/040-no-e-notation-on-log-display.patch Normal file
View file

@ -0,0 +1,27 @@
--- a/src/rrd_graph.c
+++ b/src/rrd_graph.c
@@ -2049,7 +2049,7 @@ horizontal_log_grid(gdImagePtr gif, imag
char graph_label[100];
gdPoint polyPoints[4];
int styleMinor[2],styleMajor[2];
- double value, pixperstep, minstep;
+ double value, pixperstep, minstep, yval;
/* find grid spaceing */
pixpex= (double)im->ysize / (log10(im->maxval) - log10(im->minval));
@@ -2118,7 +2118,14 @@ horizontal_log_grid(gdImagePtr gif, imag
gdImageLine(gif, polyPoints[0].x,polyPoints[0].y,
polyPoints[1].x,polyPoints[0].y,gdStyled);
- sprintf(graph_label,"%3.0e",value * yloglab[majoridx][i]);
+ yval = value * yloglab[majoridx][i];
+ if (yval >= 100000) {
+ sprintf(graph_label,"%3.0e", yval);
+ } else {
+ if (yval == 1) /* prints as 1e+00 */
+ yval = 0;
+ sprintf(graph_label,"%5.0f", yval);
+ }
gdImageString(gif, SmallFont,
(polyPoints[0].x - (strlen(graph_label) *
SmallFont->w)-7),