#frame.gnuplot #Author: 数声风笛离亭晚,我想潇湘君想秦 ########################################################## #Utility: plot a "+" style axis #Usage: #call "frame.gnuplot" "ox" "oy" "xmin" "xmax" "ymin"\ # "ymax" "dx" "dy" #Parameters: #(Frame_ox,Frame_oy): The position of the origin #(Frame_xmin,Frame_ymin): The bottum-left point #(Frame_xmax,Frame_ymax): The top-right point #Frame_dx: The interval of x-ticks #Frame_dy: The interval of y-ticks #Before calling this script, Frame_xtic_len and #Frame_ytic_len can be set to control the length #of the corresponding tick length. The length is #measured in graph coordinate. The default values #are 0.02 and 0.01. #Example: #Frame_xtic_len = 0.01 #Frame_ytic_len = 0.01 #call "frame.gnuplot" "0." "1.0" "-10." "10." "0." \ # "2." "2." "0.2" #plot sin(x)+1. ########################################################## Frame_ox=$0 Frame_oy=$1 Frame_xmin=$2 Frame_xmax=$3 Frame_ymin=$4 Frame_ymax=$5 Frame_dx=$6 Frame_dy=$7 #set the default value of Frame_x(y)tic_len if (!exist("Frame_xtic_len")) Frame_xtic_len=0.02 if (!exist("Frame_ytic_len")) Frame_ytic_len=0.01 #no plot of the default border and tics set border 0 unset tics #set the xrange and yrange to the user defined value set xrange [Frame_xmin:Frame_xmax] set yrange [Frame_ymin:Frame_ymax] #draw the axis set arrow from graph 0, first Frame_oy to graph 1.03,\ first Frame_oy size graph 0.02,15,60 fill ls -1 set arrow from first Frame_ox, graph 0 to first Frame_ox,\ graph 1.03 size graph 0.015,15,60 fill ls -1 #draw the ticks set for [i=0:int((Frame_xmax-Frame_xmin)/Frame_dx)] \ arrow from Frame_xmin+i*Frame_dx,Frame_oy to \ Frame_xmin+i*Frame_dx,Frame_oy+ \ (Frame_ymax - Frame_ymin)*Frame_xtic_len nohead set for [i=0:int((Frame_ymax-Frame_ymin)/Frame_dy)] \ arrow from Frame_ox,Frame_ymin+i*Frame_dy to \ Frame_ox+(Frame_xmax - Frame_xmin)*Frame_ytic_len, \ Frame_ymin+i*Frame_dy nohead #draw the labels with the ticks set for [i=0:int((Frame_xmax-Frame_xmin)/Frame_dx)] \ label sprintf("%3.1f",Frame_xmin+i*Frame_dx) at \ Frame_xmin+i*Frame_dx,Frame_oy center offset 0,-0.75 set for [i=0:int((Frame_ymax-Frame_ymin)/Frame_dy)] \ label sprintf("%3.1f",Frame_ymin+i*Frame_dy) at \ Frame_ox,Frame_ymin+i*Frame_dy right offset -0.75,0
Now let us show how this script is used by an example.
Frame_xtic_len = 0.01 Frame_ytic_len = 0.01 call "frame.gnuplot" "0." "1.0" "-10." "10." "0." \ "2." "2." "0.2" plot sin(x)+1. notitle
Fig.1 Cross shaped axis plotted by gnuplot |
There is another method that can be used to get this result in about 5 lines.
ReplyDeleteunset border
set xzeroaxis lt -1
set yzeroaxis lt -1
set xtics axis
set ytics axis
You are right. But your method can only put the cross point at (0,0) and here a universal method is given.
Deletegood information
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