I want to do simple graphing routines in Tcl/Tk like scatter plot, x-y plot, histograms. I am using Tcl/Tk 8.5.7. I found in Tcler's wiki that there are few options such as BLT which is not supported in Tcl/Tk 8.5+
Is there any Tcl/Tk interface to gnuplot or any widget to accomplish graphing?
Please let me know about the choices for graphing routines in Tcl/Tk.
Gnuplot can indeed produce output that Tcl/Tk can consume. This page on the Tcler's Wiki describes how (though with some extra complexity because it is doing animations). Here's a simplified version:
package require Tk
eval [exec gnuplot << "
set term tk
plot x*x
"]
pack [canvas .c]
gnuplot .c
The gnuplot command is created by evaluating the output that the gnuplot program produced. This is a little bit tricky, especially if you're wanting to do multiple plots (hint: use namespaces) but it is pretty simple to use.
You could also use the simple tklib plotchart package for some simpler things. http://tcllib.sourceforge.net/doc/plotchart.html
来源：https://stackoverflow.com/questions/9073329/graphing-routines-in-tcl-tk