[feedgnuplot] 04/11: added a new recipe

[Dima Kogan]

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dkogan-guest pushed a commit to branch debian
in repository feedgnuplot.

commit 07f574a9290db82243677dc949edb62a5e6120e5
Author: Dima Kogan <dima at secretsauce.net>
Date:   Fri Nov 25 14:39:22 2016 -0800

    added a new recipe
---
 bin/feedgnuplot | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/bin/feedgnuplot b/bin/feedgnuplot
index 9a2e940..b9d874e 100755
--- a/bin/feedgnuplot
+++ b/bin/feedgnuplot
@@ -1882,6 +1882,19 @@ in a Thinkpad.
      --binwidth 10
      --ymin 0 --xlabel 'File size (MB)' --ylabel Frequency
 
+=head2 Plotting points on top of an existing image
+
+This can be done by using C<--equation> to pass arbitrary plot input to gnuplot:
+
+ $ < features_xy.data
+   feedgnuplot --points --domain
+     --equation '"image.png" binary filetype=png flipy with rgbimage'
+
+Here an existing image is given to gnuplot verbatim, and data to plot on top of
+it is interpreted by feedgnuplot as usual. C<flipy> is useful here because
+usually the y axis points up, but when looking at images, this is usually
+reversed: the origin is the top-left pixel.
+
 =head1 ACKNOWLEDGEMENT
 
 This program is originally based on the driveGnuPlots.pl script from

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