#!/bin/bash
# plotsine.sh
# A DEMO to display a sinewave inside a standard bash terminal.
# Issued as Public Domain, 2014, B.Walker, G0LCU.
# Device: Macbook Pro 13", OSX 10.7.5, default bash terminal.
# Use variables so that you can see how it works.
angle=0
step_angle=5
vert_plot=0
horiz_plot=5
centreline=12
amplitude=11
PI=3.14159
clear
# Do a single cycle, quantised graph.
while [ $angle -le 359 ]
do
# Create each floating point value...
# CygWin now catered for... ;o)
vert_plot=$(awk "BEGIN{ printf \"%.12f\", ((sin($angle*($PI/180))*$amplitude)+$centreline)}")
#vert_plot=$(bc -l <<< "{print ((s($angle*($PI/180))*$amplitude)+$centreline)}")
# Truncate the floating point value to an integer then invert the plot to suit the x y co-ordinates inside a terminal...
vert_plot=$((24-${vert_plot/.*}))
# Plot the point(s) and print the angle at that point...
printf "\x1B["$vert_plot";"$horiz_plot"f*"
printf "\x1B[22;1fAngle is $angle degrees..."
sleep 0.1
# Increment values...
angle=$((angle+step_angle))
horiz_plot=$((horiz_plot+1))
done
printf "\x1B[23;1fSinewave plotted as a quantised text mode graph.\n"
exit 0
#
# *********
# *** ***
# * *
# ** **
# * *
# * *
# * *
# * *
# * *
# * *
# ** **
# * *
# * *
# * *
# * *
# * *
# * *
# * *
# ** **
# * *
#Angle is 355 degrees... *** ***
#Sinewave plotted as a quantised text mode graph. *********
#AMIGA:barrywalker~> _
Diff to Previous Revision
--- revision 1 2014-08-10 10:26:20
+++ revision 2 2014-08-12 20:57:39
@@ -16,7 +16,9 @@
while [ $angle -le 359 ]
do
# Create each floating point value...
- vert_plot=$(bc -l <<< "{print ((s($angle*($PI/180))*$amplitude)+$centreline)}")
+ # CygWin now catered for... ;o)
+ vert_plot=$(awk "BEGIN{ printf \"%.12f\", ((sin($angle*($PI/180))*$amplitude)+$centreline)}")
+ #vert_plot=$(bc -l <<< "{print ((s($angle*($PI/180))*$amplitude)+$centreline)}")
# Truncate the floating point value to an integer then invert the plot to suit the x y co-ordinates inside a terminal...
vert_plot=$((24-${vert_plot/.*}))
# Plot the point(s) and print the angle at that point...
