How to draw two concentric simple closed curves using tikz

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What is a small piece ot tikz code for reproducing the figure below ?

Source: http://withits.epfl.ch/_media/events/slides-elgamal.pdf

Notes: I'm familiar with this question Draw a $epsilon$ neighborhood, but it doesn't really answer my quest.

draw

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edited Aug 22 at 14:23

marmot

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asked Aug 22 at 14:00

dohmatob

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up vote
3
down vote

favorite

What is a small piece ot tikz code for reproducing the figure below ?

Source: http://withits.epfl.ch/_media/events/slides-elgamal.pdf

Notes: I'm familiar with this question Draw a $epsilon$ neighborhood, but it doesn't really answer my quest.

draw

share|improve this question

edited Aug 22 at 14:23

marmot

55.4k460121

asked Aug 22 at 14:00

dohmatob

1183

add a comment | 

up vote
3
down vote

favorite

up vote
3
down vote

favorite

What is a small piece ot tikz code for reproducing the figure below ?

Source: http://withits.epfl.ch/_media/events/slides-elgamal.pdf

Notes: I'm familiar with this question Draw a $epsilon$ neighborhood, but it doesn't really answer my quest.

draw

share|improve this question

edited Aug 22 at 14:23

marmot

55.4k460121

asked Aug 22 at 14:00

dohmatob

1183

What is a small piece ot tikz code for reproducing the figure below ?

Source: http://withits.epfl.ch/_media/events/slides-elgamal.pdf

Notes: I'm familiar with this question Draw a $epsilon$ neighborhood, but it doesn't really answer my quest.

draw

share|improve this question

edited Aug 22 at 14:23

marmot

55.4k460121

asked Aug 22 at 14:00

dohmatob

1183

share|improve this question

share|improve this question

edited Aug 22 at 14:23

marmot

55.4k460121

edited Aug 22 at 14:23

marmot

55.4k460121

edited Aug 22 at 14:23

marmot

55.4k460121

55.4k460121

asked Aug 22 at 14:00

dohmatob

1183

asked Aug 22 at 14:00

dohmatob

1183

asked Aug 22 at 14:00

dohmatob

1183

1183

add a comment | 

add a comment | 

2 Answers
2

active

oldest

votes

up vote
5
down vote



accepted

Welcome to TeX.SE! EDIT: Adjusted the tension parameter to get a smoother output.

documentclass[tikz,border=3.14mm]standalone
begindocument
begintikzpicture
 draw[double distance=6pt,fill=blue] plot[smooth cycle,tension=0.7] coordinates (0,0) (0.3,0.6) (1,0.8) (1.4,0.2)
 (1.2,-0.3) (0.4,-0.4);
 draw[latex-] (3pt,0) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[latex-] (1.4cm+3pt,0.2) -- ++(1,-0.2)
 node[right]$Gamma_ell(mathcalA)$;
endtikzpicture
enddocument

This animation shows a bit what tension does.

documentclass[tikz,border=3.14mm]standalone
begindocument
foreach X in 0.5,0.6,...,1.5
begintikzpicture
 draw[double distance=6pt,fill=blue] plot[smooth cycle,tension=X] coordinates (0,0) (0.3,0.6) (1,0.8) (1.4,0.2)
 (1.2,-0.3) (0.4,-0.4);
 draw[latex-] (3pt,0) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[latex-] (1.4cm+3pt,0.2) -- ++(1,-0.2)
 node[right]$Gamma_ell(mathcalA)$;
endtikzpicture
enddocument

Of course, you can also adjust the coordinates.

share|improve this answer

edited Aug 22 at 16:29

answered Aug 22 at 14:20

marmot

55.4k460121

add a comment | 

up vote
4
down vote

You can simply start by drawing a triangle like draw (1,0)--(-2,3)--(2,5)--cycle, then, with the aid of a grid you start adding two control points between each pair of vertices like .. controls (a) and (b)... You need to tweak the control points a bit to get the desired shape. Look at this answer, e.g., to know more about how to choose control points.

documentclass[tikz,border=5pt]standalone
usetikzlibraryarrows.meta
begindocument

begintikzpicture[scale=.5, > = Stealth] 
 draw[double distance=10pt,fill=blue] (1,0) .. controls (-1.5,0) and (-2.5,2)..
 (-2,3) .. controls (-1,5) and (1,5.3) ..
 (2,5) .. controls (5,4) and (3,0) .. 
 (1,0) -- cycle;
 draw[<-] (-1.5,1.5) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[<-] (3.5,1.5) -- ++(1,-0.2) node[right]$Gamma_ell(mathcalA)$;
endtikzpicture

enddocument

share|improve this answer

edited Aug 22 at 17:51

answered Aug 22 at 17:43

AboAmmar

30.4k22780

add a comment | 

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

active

oldest

votes

active

oldest

votes

up vote
5
down vote



accepted

Welcome to TeX.SE! EDIT: Adjusted the tension parameter to get a smoother output.

documentclass[tikz,border=3.14mm]standalone
begindocument
begintikzpicture
 draw[double distance=6pt,fill=blue] plot[smooth cycle,tension=0.7] coordinates (0,0) (0.3,0.6) (1,0.8) (1.4,0.2)
 (1.2,-0.3) (0.4,-0.4);
 draw[latex-] (3pt,0) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[latex-] (1.4cm+3pt,0.2) -- ++(1,-0.2)
 node[right]$Gamma_ell(mathcalA)$;
endtikzpicture
enddocument

This animation shows a bit what tension does.

documentclass[tikz,border=3.14mm]standalone
begindocument
foreach X in 0.5,0.6,...,1.5
begintikzpicture
 draw[double distance=6pt,fill=blue] plot[smooth cycle,tension=X] coordinates (0,0) (0.3,0.6) (1,0.8) (1.4,0.2)
 (1.2,-0.3) (0.4,-0.4);
 draw[latex-] (3pt,0) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[latex-] (1.4cm+3pt,0.2) -- ++(1,-0.2)
 node[right]$Gamma_ell(mathcalA)$;
endtikzpicture
enddocument

Of course, you can also adjust the coordinates.

share|improve this answer

edited Aug 22 at 16:29

answered Aug 22 at 14:20

marmot

55.4k460121

add a comment | 

up vote
5
down vote



accepted

Welcome to TeX.SE! EDIT: Adjusted the tension parameter to get a smoother output.

documentclass[tikz,border=3.14mm]standalone
begindocument
begintikzpicture
 draw[double distance=6pt,fill=blue] plot[smooth cycle,tension=0.7] coordinates (0,0) (0.3,0.6) (1,0.8) (1.4,0.2)
 (1.2,-0.3) (0.4,-0.4);
 draw[latex-] (3pt,0) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[latex-] (1.4cm+3pt,0.2) -- ++(1,-0.2)
 node[right]$Gamma_ell(mathcalA)$;
endtikzpicture
enddocument

This animation shows a bit what tension does.

documentclass[tikz,border=3.14mm]standalone
begindocument
foreach X in 0.5,0.6,...,1.5
begintikzpicture
 draw[double distance=6pt,fill=blue] plot[smooth cycle,tension=X] coordinates (0,0) (0.3,0.6) (1,0.8) (1.4,0.2)
 (1.2,-0.3) (0.4,-0.4);
 draw[latex-] (3pt,0) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[latex-] (1.4cm+3pt,0.2) -- ++(1,-0.2)
 node[right]$Gamma_ell(mathcalA)$;
endtikzpicture
enddocument

Of course, you can also adjust the coordinates.

share|improve this answer

edited Aug 22 at 16:29

answered Aug 22 at 14:20

marmot

55.4k460121

add a comment | 

up vote
5
down vote



accepted

up vote
5
down vote



accepted

Welcome to TeX.SE! EDIT: Adjusted the tension parameter to get a smoother output.

documentclass[tikz,border=3.14mm]standalone
begindocument
begintikzpicture
 draw[double distance=6pt,fill=blue] plot[smooth cycle,tension=0.7] coordinates (0,0) (0.3,0.6) (1,0.8) (1.4,0.2)
 (1.2,-0.3) (0.4,-0.4);
 draw[latex-] (3pt,0) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[latex-] (1.4cm+3pt,0.2) -- ++(1,-0.2)
 node[right]$Gamma_ell(mathcalA)$;
endtikzpicture
enddocument

This animation shows a bit what tension does.

documentclass[tikz,border=3.14mm]standalone
begindocument
foreach X in 0.5,0.6,...,1.5
begintikzpicture
 draw[double distance=6pt,fill=blue] plot[smooth cycle,tension=X] coordinates (0,0) (0.3,0.6) (1,0.8) (1.4,0.2)
 (1.2,-0.3) (0.4,-0.4);
 draw[latex-] (3pt,0) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[latex-] (1.4cm+3pt,0.2) -- ++(1,-0.2)
 node[right]$Gamma_ell(mathcalA)$;
endtikzpicture
enddocument

Of course, you can also adjust the coordinates.

share|improve this answer

edited Aug 22 at 16:29

answered Aug 22 at 14:20

marmot

55.4k460121

Welcome to TeX.SE! EDIT: Adjusted the tension parameter to get a smoother output.

documentclass[tikz,border=3.14mm]standalone
begindocument
begintikzpicture
 draw[double distance=6pt,fill=blue] plot[smooth cycle,tension=0.7] coordinates (0,0) (0.3,0.6) (1,0.8) (1.4,0.2)
 (1.2,-0.3) (0.4,-0.4);
 draw[latex-] (3pt,0) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[latex-] (1.4cm+3pt,0.2) -- ++(1,-0.2)
 node[right]$Gamma_ell(mathcalA)$;
endtikzpicture
enddocument

This animation shows a bit what tension does.

documentclass[tikz,border=3.14mm]standalone
begindocument
foreach X in 0.5,0.6,...,1.5
begintikzpicture
 draw[double distance=6pt,fill=blue] plot[smooth cycle,tension=X] coordinates (0,0) (0.3,0.6) (1,0.8) (1.4,0.2)
 (1.2,-0.3) (0.4,-0.4);
 draw[latex-] (3pt,0) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[latex-] (1.4cm+3pt,0.2) -- ++(1,-0.2)
 node[right]$Gamma_ell(mathcalA)$;
endtikzpicture
enddocument

Of course, you can also adjust the coordinates.

share|improve this answer

edited Aug 22 at 16:29

answered Aug 22 at 14:20

marmot

55.4k460121

share|improve this answer

share|improve this answer

edited Aug 22 at 16:29

edited Aug 22 at 16:29

edited Aug 22 at 16:29

answered Aug 22 at 14:20

marmot

55.4k460121

answered Aug 22 at 14:20

marmot

55.4k460121

answered Aug 22 at 14:20

marmot

55.4k460121

55.4k460121

add a comment | 

add a comment | 

up vote
4
down vote

You can simply start by drawing a triangle like draw (1,0)--(-2,3)--(2,5)--cycle, then, with the aid of a grid you start adding two control points between each pair of vertices like .. controls (a) and (b)... You need to tweak the control points a bit to get the desired shape. Look at this answer, e.g., to know more about how to choose control points.

documentclass[tikz,border=5pt]standalone
usetikzlibraryarrows.meta
begindocument

begintikzpicture[scale=.5, > = Stealth] 
 draw[double distance=10pt,fill=blue] (1,0) .. controls (-1.5,0) and (-2.5,2)..
 (-2,3) .. controls (-1,5) and (1,5.3) ..
 (2,5) .. controls (5,4) and (3,0) .. 
 (1,0) -- cycle;
 draw[<-] (-1.5,1.5) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[<-] (3.5,1.5) -- ++(1,-0.2) node[right]$Gamma_ell(mathcalA)$;
endtikzpicture

enddocument

share|improve this answer

edited Aug 22 at 17:51

answered Aug 22 at 17:43

AboAmmar

30.4k22780

add a comment | 

up vote
4
down vote

You can simply start by drawing a triangle like draw (1,0)--(-2,3)--(2,5)--cycle, then, with the aid of a grid you start adding two control points between each pair of vertices like .. controls (a) and (b)... You need to tweak the control points a bit to get the desired shape. Look at this answer, e.g., to know more about how to choose control points.

documentclass[tikz,border=5pt]standalone
usetikzlibraryarrows.meta
begindocument

begintikzpicture[scale=.5, > = Stealth] 
 draw[double distance=10pt,fill=blue] (1,0) .. controls (-1.5,0) and (-2.5,2)..
 (-2,3) .. controls (-1,5) and (1,5.3) ..
 (2,5) .. controls (5,4) and (3,0) .. 
 (1,0) -- cycle;
 draw[<-] (-1.5,1.5) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[<-] (3.5,1.5) -- ++(1,-0.2) node[right]$Gamma_ell(mathcalA)$;
endtikzpicture

enddocument

share|improve this answer

edited Aug 22 at 17:51

answered Aug 22 at 17:43

AboAmmar

30.4k22780

add a comment | 

up vote
4
down vote

up vote
4
down vote

You can simply start by drawing a triangle like draw (1,0)--(-2,3)--(2,5)--cycle, then, with the aid of a grid you start adding two control points between each pair of vertices like .. controls (a) and (b)... You need to tweak the control points a bit to get the desired shape. Look at this answer, e.g., to know more about how to choose control points.

documentclass[tikz,border=5pt]standalone
usetikzlibraryarrows.meta
begindocument

begintikzpicture[scale=.5, > = Stealth] 
 draw[double distance=10pt,fill=blue] (1,0) .. controls (-1.5,0) and (-2.5,2)..
 (-2,3) .. controls (-1,5) and (1,5.3) ..
 (2,5) .. controls (5,4) and (3,0) .. 
 (1,0) -- cycle;
 draw[<-] (-1.5,1.5) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[<-] (3.5,1.5) -- ++(1,-0.2) node[right]$Gamma_ell(mathcalA)$;
endtikzpicture

enddocument

share|improve this answer

edited Aug 22 at 17:51

answered Aug 22 at 17:43

AboAmmar

30.4k22780

You can simply start by drawing a triangle like draw (1,0)--(-2,3)--(2,5)--cycle, then, with the aid of a grid you start adding two control points between each pair of vertices like .. controls (a) and (b)... You need to tweak the control points a bit to get the desired shape. Look at this answer, e.g., to know more about how to choose control points.

documentclass[tikz,border=5pt]standalone
usetikzlibraryarrows.meta
begindocument

begintikzpicture[scale=.5, > = Stealth] 
 draw[double distance=10pt,fill=blue] (1,0) .. controls (-1.5,0) and (-2.5,2)..
 (-2,3) .. controls (-1,5) and (1,5.3) ..
 (2,5) .. controls (5,4) and (3,0) .. 
 (1,0) -- cycle;
 draw[<-] (-1.5,1.5) -- ++(-1,-0.2) node[left]$mathcalA$;
 draw[<-] (3.5,1.5) -- ++(1,-0.2) node[right]$Gamma_ell(mathcalA)$;
endtikzpicture

enddocument

share|improve this answer

edited Aug 22 at 17:51

answered Aug 22 at 17:43

AboAmmar

30.4k22780

share|improve this answer

share|improve this answer

edited Aug 22 at 17:51

edited Aug 22 at 17:51

edited Aug 22 at 17:51

answered Aug 22 at 17:43

AboAmmar

30.4k22780

answered Aug 22 at 17:43

AboAmmar

30.4k22780

answered Aug 22 at 17:43

AboAmmar

30.4k22780

30.4k22780

add a comment | 

add a comment | 

 

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