clear
window 0
defaults
!
define\constants
generate theta 0,,2*pi,1000
b=0.5
r=-b+cos(theta)
set
 autoscale commensurate
 %xnumbersheight 2
 %ynumbersheight 2
 curvelinewidth 5
 curvecolor red
 
graph r*cos(theta) r*sin(theta)
set
 curvecolor black
 curvelinewidth 1

zerolines
!
get
 %xupperaxis xux
 %xloweraxis xlx
 %yupperaxis yux
 
set
 %textheight 6
 textfont 'Arial Black'
 %xtextlocation (xux+xlx)/2
 %ytextlocation yux+1
 textalign 2
 textinteractive 0
 
text 'Limacon of Pascal'
set
 %textheight 3
 textfont 'Arial'
 %xtextlocation 45
 %ytextlocation 75
 textalign 1
 
text '<theta> = [0:2*<pi><z.05>]'
set %ytextlocation 70
text '<rho> = -b + cos(<theta>)'