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How does TikZ render an arc?

0

With the sample MWE below, TikZ generates the following diagram:

1. Drawing an arc

documentclass{article}

usepackage{tikz}

begin{document}

begin{tikzpicture}

  coordinate[label=below:$a$] (a) at (0,0);



  draw (a) arc(0:180:2);

end{tikzpicture}

end{document} 

2. Drawing a circle

documentclass{article}

usepackage{tikz}

begin{document}

begin{tikzpicture}

  coordinate[label=below:$a$] (a) at (0,0);

  coordinate[label=below:$b$] (b) at (5,5);



  draw (a) arc(0:180:2);

  draw (b) circle [radius=2cm];

end{tikzpicture}

end{document} 

With draw <coordinate> circle command, TikZ draws a circle, with the <coordinate> at its center.

With draw <coordinate> arc command, TikZ draws an arc, with the <coordinate> as one of its endpoints.

I wish to understand, why this difference of behavior and how is TikZ drawing the arc with draw (a) arc(0:180:2);.

Why does TikZ does not use (a) as its center point while drawing an arc similar to drawing a circle.

How does TikZ actually draw the arc with point a.

What is the reference and center point, when TikZ draws an arc.

tikz-pgf

share|improve this question

asked 11 mins ago

subham sonisubham soni

5,03783188

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  May I draw your attention to this question? IMHO the question "Why does TikZ does not use (a) as its center point while drawing an arc similar to drawing a circle?" is not really answerable, and there are more than enough answers that show you how you can get whatever behavior you want.
  
  – marmot
  3 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @marmot that doesn't actually answer the question. I want to understand the mathematical geometry behind the example given
  
  – subham soni
  1 min ago
  

  
  
  
  

add a comment | 

0

With the sample MWE below, TikZ generates the following diagram:

1. Drawing an arc

documentclass{article}

usepackage{tikz}

begin{document}

begin{tikzpicture}

  coordinate[label=below:$a$] (a) at (0,0);



  draw (a) arc(0:180:2);

end{tikzpicture}

end{document} 

2. Drawing a circle

documentclass{article}

usepackage{tikz}

begin{document}

begin{tikzpicture}

  coordinate[label=below:$a$] (a) at (0,0);

  coordinate[label=below:$b$] (b) at (5,5);



  draw (a) arc(0:180:2);

  draw (b) circle [radius=2cm];

end{tikzpicture}

end{document} 

With draw <coordinate> circle command, TikZ draws a circle, with the <coordinate> at its center.

With draw <coordinate> arc command, TikZ draws an arc, with the <coordinate> as one of its endpoints.

I wish to understand, why this difference of behavior and how is TikZ drawing the arc with draw (a) arc(0:180:2);.

Why does TikZ does not use (a) as its center point while drawing an arc similar to drawing a circle.

How does TikZ actually draw the arc with point a.

What is the reference and center point, when TikZ draws an arc.

tikz-pgf

share|improve this question

asked 11 mins ago

subham sonisubham soni

5,03783188

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  May I draw your attention to this question? IMHO the question "Why does TikZ does not use (a) as its center point while drawing an arc similar to drawing a circle?" is not really answerable, and there are more than enough answers that show you how you can get whatever behavior you want.
  
  – marmot
  3 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @marmot that doesn't actually answer the question. I want to understand the mathematical geometry behind the example given
  
  – subham soni
  1 min ago
  

  
  
  
  

add a comment | 

With the sample MWE below, TikZ generates the following diagram:

1. Drawing an arc

documentclass{article}

usepackage{tikz}

begin{document}

begin{tikzpicture}

  coordinate[label=below:$a$] (a) at (0,0);



  draw (a) arc(0:180:2);

end{tikzpicture}

end{document} 

2. Drawing a circle

documentclass{article}

usepackage{tikz}

begin{document}

begin{tikzpicture}

  coordinate[label=below:$a$] (a) at (0,0);

  coordinate[label=below:$b$] (b) at (5,5);



  draw (a) arc(0:180:2);

  draw (b) circle [radius=2cm];

end{tikzpicture}

end{document} 

With draw <coordinate> circle command, TikZ draws a circle, with the <coordinate> at its center.

With draw <coordinate> arc command, TikZ draws an arc, with the <coordinate> as one of its endpoints.

I wish to understand, why this difference of behavior and how is TikZ drawing the arc with draw (a) arc(0:180:2);.

Why does TikZ does not use (a) as its center point while drawing an arc similar to drawing a circle.

How does TikZ actually draw the arc with point a.

What is the reference and center point, when TikZ draws an arc.

tikz-pgf

share|improve this question

asked 11 mins ago

subham sonisubham soni

5,03783188

documentclass{article}

usepackage{tikz}

begin{document}

begin{tikzpicture}

  coordinate[label=below:$a$] (a) at (0,0);



  draw (a) arc(0:180:2);

end{tikzpicture}

end{document} 

documentclass{article}

usepackage{tikz}

begin{document}

begin{tikzpicture}

  coordinate[label=below:$a$] (a) at (0,0);

  coordinate[label=below:$b$] (b) at (5,5);



  draw (a) arc(0:180:2);

  draw (b) circle [radius=2cm];

end{tikzpicture}

end{document} 

share|improve this question

asked 11 mins ago

subham sonisubham soni

5,03783188

share|improve this question

asked 11 mins ago

subham sonisubham soni

5,03783188

asked 11 mins ago

subham sonisubham soni

5,03783188

asked 11 mins ago

subham sonisubham soni

5,03783188