Gnuplot - plotting a plot at a point
I know this was asked a while ago using images for points , but I was wondering if anyone could provide more detailed help or what recent changes to gnuplot make this easier?
My question is slightly different and I didn't want to reopen the 6th question
I am trying to create a plot for a weather forecast like this: Screenshot of AIX Weather Widget
I have data from the openweathermap api and the icon set is shading the pace, precipitation, etc. trivial. What I would like to do is draw an image / icon to show the weather just above the temperature graph
It looks like it center
will work, but how can I get center
to match the datapoint, or more precisely a few pixels above the datapoint
Any alternative suggestions would also be greatly appreciated
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Here's how to do it in two steps:
IMG_LIST="cloud.png sun.png"
X=""
Y=""
IMG=""
storedata(x,y,index_img)= \
(X=X.sprintf(" %f",x), \
Y=Y.sprintf(" %f",y), \
IMG=IMG." ".word(IMG_LIST,int(index_img)),y)
plot '-' using 1:(storedata($1,$2,$3))
0.5 23 2
1.5 27 2
2.5 19 1
e
plot [0:3][0:40] for [i=1:words(IMG)] word(IMG,i) binary filetype=png center=(word(X,i),word(Y,i)) dx=0.005 dy=0.05 with rgbimage notitle
The first step is to create lists (items separated by spaces on lines X, Y and IMG) with the graph data. Then the for-loop displays the images in the right place. Dx and dy need to be adjusted depending on image size and graph ranges (could be automated with data GPVAL_*
).
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