Tikz: shifting coordinate after arc (and radial color gradient)

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Basically, I wanted to create an illustration similar to the bottom rod of this plot:

Following the answers here and here, below is the code for my best attempts. There are two issues:

1. In both attempts, the shift to the left doesn't work as intended. I expected the 1st arc to end at 2*4cm diameter = (8cm, 0), then shift -2cm -> (6cm, 0), then the 2nd arc to end at 6cm-2*2cm diameter = (2cm, 0)


2. I want the color gradient to propogate radially, rather than just from top to bottom.

Code:

documentclassstandalone
usepackagetikz

begindocument
begintikzpicture

shade[thin, draw=black, top color=blue,bottom color=red] 
(0cm,0cm) arc (0:180:4cm) -- +(-2cm,0) arc (180:0:2cm) -- cycle;

shade[thin, draw=black, top color=blue,bottom color=red] 
(0cm,0cm) arc (0:180:4cm) coordinate (a) -- ([xshift=-2cm]a) arc (180:0:2cm) -- cycle; 

endtikzpicture
begindocument

tikz-pgf

share|improve this question

asked Aug 12 at 18:48

Chris Sewell

1158

add a comment | 

up vote
8
down vote

favorite

Basically, I wanted to create an illustration similar to the bottom rod of this plot:

Following the answers here and here, below is the code for my best attempts. There are two issues:

1. In both attempts, the shift to the left doesn't work as intended. I expected the 1st arc to end at 2*4cm diameter = (8cm, 0), then shift -2cm -> (6cm, 0), then the 2nd arc to end at 6cm-2*2cm diameter = (2cm, 0)


2. I want the color gradient to propogate radially, rather than just from top to bottom.

Code:

documentclassstandalone
usepackagetikz

begindocument
begintikzpicture

shade[thin, draw=black, top color=blue,bottom color=red] 
(0cm,0cm) arc (0:180:4cm) -- +(-2cm,0) arc (180:0:2cm) -- cycle;

shade[thin, draw=black, top color=blue,bottom color=red] 
(0cm,0cm) arc (0:180:4cm) coordinate (a) -- ([xshift=-2cm]a) arc (180:0:2cm) -- cycle; 

endtikzpicture
begindocument

tikz-pgf

share|improve this question

asked Aug 12 at 18:48

Chris Sewell

1158

add a comment | 

up vote
8
down vote

favorite

up vote
8
down vote

favorite

Basically, I wanted to create an illustration similar to the bottom rod of this plot:

Following the answers here and here, below is the code for my best attempts. There are two issues:

1. In both attempts, the shift to the left doesn't work as intended. I expected the 1st arc to end at 2*4cm diameter = (8cm, 0), then shift -2cm -> (6cm, 0), then the 2nd arc to end at 6cm-2*2cm diameter = (2cm, 0)


2. I want the color gradient to propogate radially, rather than just from top to bottom.

Code:

documentclassstandalone
usepackagetikz

begindocument
begintikzpicture

shade[thin, draw=black, top color=blue,bottom color=red] 
(0cm,0cm) arc (0:180:4cm) -- +(-2cm,0) arc (180:0:2cm) -- cycle;

shade[thin, draw=black, top color=blue,bottom color=red] 
(0cm,0cm) arc (0:180:4cm) coordinate (a) -- ([xshift=-2cm]a) arc (180:0:2cm) -- cycle; 

endtikzpicture
begindocument

tikz-pgf

share|improve this question

asked Aug 12 at 18:48

Chris Sewell

1158

Basically, I wanted to create an illustration similar to the bottom rod of this plot:

Following the answers here and here, below is the code for my best attempts. There are two issues:

1. In both attempts, the shift to the left doesn't work as intended. I expected the 1st arc to end at 2*4cm diameter = (8cm, 0), then shift -2cm -> (6cm, 0), then the 2nd arc to end at 6cm-2*2cm diameter = (2cm, 0)


2. I want the color gradient to propogate radially, rather than just from top to bottom.

Code:

documentclassstandalone
usepackagetikz

begindocument
begintikzpicture

shade[thin, draw=black, top color=blue,bottom color=red] 
(0cm,0cm) arc (0:180:4cm) -- +(-2cm,0) arc (180:0:2cm) -- cycle;

shade[thin, draw=black, top color=blue,bottom color=red] 
(0cm,0cm) arc (0:180:4cm) coordinate (a) -- ([xshift=-2cm]a) arc (180:0:2cm) -- cycle; 

endtikzpicture
begindocument

tikz-pgf

share|improve this question

asked Aug 12 at 18:48

Chris Sewell

1158

share|improve this question

share|improve this question

asked Aug 12 at 18:48

Chris Sewell

1158

asked Aug 12 at 18:48

Chris Sewell

1158

asked Aug 12 at 18:48

Chris Sewell

1158

1158

add a comment | 

add a comment | 

2 Answers
2

active

oldest

votes

up vote
9
down vote



accepted

edit:

• 
  

  first problem (please, one problem per question :-) )

  
  
  

  if i understand your question correctly, than you try to obtain the following image:

  
  

i interchange the start/end points of arcs and move coordinate (0,0) to the middle of image:

documentclass[tikz, margin=3mm]standalone

begindocument
 begintikzpicture
shade[thin, draw=black, top color=blue,bottom color=red]
(-4,0) arc (180:0:4cm) -- +(-2,0) arc (0:180:2cm) -- cycle;
 endtikzpicture
enddocument

• 
  

  second problem

  
  
  

  it is not trivial. temporary i'm not able to find satisfactory solution with use of arc. simple replace top color=blue,bottom color=red with inner color=red, outer control=blue doesn't gives what cab be described as radial gradient color.

  
  
  

  one way to solve this problem can be use ideas from radial shading as propose May Snippe in his comment below. so far i can only say that solution on such a way require different approach to draw your image:

  
  
  

  documentclass[tikz, margin=3mm]standalone
  
  tikzset
   ring shading/.code args=from #1 at #2 to #3 at #4
   defcolin#1
   defradin#2
   defcolout#3
   defradout#4
   pgfmathsetmacroproportionradin/radout
   pgfmathsetmacroouter.8818cm
   pgfmathsetmacroinner.8818cm*proportion
   pgfmathsetmacroinnerlowinner-0.01pt
   pgfdeclareradialshadingringpgfpoint0cm0cm%
   
   color(0pt)=(white);
   color(innerlow)=(white);
   color(inner)=(#1);
   color(outer)=(#3)
   
   pgfkeysalso/tikz/shading=ring
   ,
  
  
  begindocument
  begintikzpicture
  clip (-4,0) rectangle + (8,4);
  shade[draw,ring shading=from red at 2 to blue at 4]
   (0,0) circle (2) circle (4);
  endtikzpicture
  enddocument
  

  
  

which gives:

• 
  

  three color gradiend coloring, as asked in comment

  
  
  

  it is a little bit more complex, since i compose it from two circles' pairs, from which is the second is drawn on background layer. for this you need to add usetikzlibrarybackgrounds in document preamble and than the document body write for example as:

  
  
  

  begindocument
  begintikzpicture
  deflok(-4,0) arc (180:0:4cm) -- +(-2,0) arc (0:180:2cm) -- cycle
  draw lok;
  clip lok;
  shade[ring shading=from red at 2 to white at 2.9]
   (0,0) circle (2) circle (2.9);
   beginscope[on background layer]
  clip lok;
  shade[ring shading=from white at 3.1 to blue at 4]
   (0,0) circle (3.1) circle (4);
   endscope
  endtikzpicture
  enddocument
  

  
  

gives:

as you can see, rings are slightly separated that white transient is thicker. if you prefer narrower white transient, than change radius of outer and inner circles of rings from 2.9 to 3.0 and from 3.1 to 3.0 respectively. with this both rings will touch each other:

share|improve this answer

edited Aug 20 at 8:08

answered Aug 12 at 19:20

Zarko

111k861149

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Maybe the second point of OP's question could be solved with radial shading? (+1 of course)
  – Max
  Aug 12 at 19:31
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @MaxSnippe, huh, i overlooked this, :-(. i will add this asap :-)
  – Zarko
  Aug 12 at 19:33
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @MaxSnippe, adding gradient shading is not so trivial ... it will take me more time :-(.
  – Zarko
  Aug 12 at 19:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  Maybe this question could help? I don't mind, take your time :) I think OP doesn't mind either.
  – Max
  Aug 12 at 19:44
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @ChrisSewell, in this case you need to combine two pairs of circles. i will try to do this tomorrow evening.
  – Zarko
  Aug 12 at 22:06
  

  
  
  
  

 | 
show 5 more comments

up vote
5
down vote

I'd use a color wheel for that. With transform canvas you can rotate it. Here is an animation that may help you pick your favorite rotation angle.

documentclass[tikz, margin=3.14mm]standalone 
usetikzlibraryshadings
begindocument
foreach X in 0,4,...,364
begintikzpicture
clip (-1.5,0) arc(180:0:1.5) -- (2.5,0) arc(0:180:2.5) -- cycle;
shade[shading=color wheel,transform canvas=rotate=X] 
circle (2.5cm);
endtikzpicture
enddocument

share|improve this answer

answered Aug 12 at 22:53

marmot

54.9k459119

• 
  
  
  

  
  

  
  
  
  
  
  

  
  I should maybe add that the color wheel animation appears to be less colorful than it really is (where "really" refers to the pdf version) due to the upload restrictions that limit the number of the GIF to be at most 256.
  – marmot
  Aug 13 at 1:57
  
  

  
  
  
  

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
9
down vote



accepted

edit:

• 
  

  first problem (please, one problem per question :-) )

  
  
  

  if i understand your question correctly, than you try to obtain the following image:

  
  

i interchange the start/end points of arcs and move coordinate (0,0) to the middle of image:

documentclass[tikz, margin=3mm]standalone

begindocument
 begintikzpicture
shade[thin, draw=black, top color=blue,bottom color=red]
(-4,0) arc (180:0:4cm) -- +(-2,0) arc (0:180:2cm) -- cycle;
 endtikzpicture
enddocument

• 
  

  second problem

  
  
  

  it is not trivial. temporary i'm not able to find satisfactory solution with use of arc. simple replace top color=blue,bottom color=red with inner color=red, outer control=blue doesn't gives what cab be described as radial gradient color.

  
  
  

  one way to solve this problem can be use ideas from radial shading as propose May Snippe in his comment below. so far i can only say that solution on such a way require different approach to draw your image:

  
  
  

  documentclass[tikz, margin=3mm]standalone
  
  tikzset
   ring shading/.code args=from #1 at #2 to #3 at #4
   defcolin#1
   defradin#2
   defcolout#3
   defradout#4
   pgfmathsetmacroproportionradin/radout
   pgfmathsetmacroouter.8818cm
   pgfmathsetmacroinner.8818cm*proportion
   pgfmathsetmacroinnerlowinner-0.01pt
   pgfdeclareradialshadingringpgfpoint0cm0cm%
   
   color(0pt)=(white);
   color(innerlow)=(white);
   color(inner)=(#1);
   color(outer)=(#3)
   
   pgfkeysalso/tikz/shading=ring
   ,
  
  
  begindocument
  begintikzpicture
  clip (-4,0) rectangle + (8,4);
  shade[draw,ring shading=from red at 2 to blue at 4]
   (0,0) circle (2) circle (4);
  endtikzpicture
  enddocument
  

  
  

which gives:

• 
  

  three color gradiend coloring, as asked in comment

  
  
  

  it is a little bit more complex, since i compose it from two circles' pairs, from which is the second is drawn on background layer. for this you need to add usetikzlibrarybackgrounds in document preamble and than the document body write for example as:

  
  
  

  begindocument
  begintikzpicture
  deflok(-4,0) arc (180:0:4cm) -- +(-2,0) arc (0:180:2cm) -- cycle
  draw lok;
  clip lok;
  shade[ring shading=from red at 2 to white at 2.9]
   (0,0) circle (2) circle (2.9);
   beginscope[on background layer]
  clip lok;
  shade[ring shading=from white at 3.1 to blue at 4]
   (0,0) circle (3.1) circle (4);
   endscope
  endtikzpicture
  enddocument
  

  
  

gives:

as you can see, rings are slightly separated that white transient is thicker. if you prefer narrower white transient, than change radius of outer and inner circles of rings from 2.9 to 3.0 and from 3.1 to 3.0 respectively. with this both rings will touch each other:

share|improve this answer

edited Aug 20 at 8:08

answered Aug 12 at 19:20

Zarko

111k861149

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Maybe the second point of OP's question could be solved with radial shading? (+1 of course)
  – Max
  Aug 12 at 19:31
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @MaxSnippe, huh, i overlooked this, :-(. i will add this asap :-)
  – Zarko
  Aug 12 at 19:33
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @MaxSnippe, adding gradient shading is not so trivial ... it will take me more time :-(.
  – Zarko
  Aug 12 at 19:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  Maybe this question could help? I don't mind, take your time :) I think OP doesn't mind either.
  – Max
  Aug 12 at 19:44
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @ChrisSewell, in this case you need to combine two pairs of circles. i will try to do this tomorrow evening.
  – Zarko
  Aug 12 at 22:06
  

  
  
  
  

 | 
show 5 more comments

up vote
9
down vote



accepted

edit:

• 
  

  first problem (please, one problem per question :-) )

  
  
  

  if i understand your question correctly, than you try to obtain the following image:

  
  

i interchange the start/end points of arcs and move coordinate (0,0) to the middle of image:

documentclass[tikz, margin=3mm]standalone

begindocument
 begintikzpicture
shade[thin, draw=black, top color=blue,bottom color=red]
(-4,0) arc (180:0:4cm) -- +(-2,0) arc (0:180:2cm) -- cycle;
 endtikzpicture
enddocument

• 
  

  second problem

  
  
  

  it is not trivial. temporary i'm not able to find satisfactory solution with use of arc. simple replace top color=blue,bottom color=red with inner color=red, outer control=blue doesn't gives what cab be described as radial gradient color.

  
  
  

  one way to solve this problem can be use ideas from radial shading as propose May Snippe in his comment below. so far i can only say that solution on such a way require different approach to draw your image:

  
  
  

  documentclass[tikz, margin=3mm]standalone
  
  tikzset
   ring shading/.code args=from #1 at #2 to #3 at #4
   defcolin#1
   defradin#2
   defcolout#3
   defradout#4
   pgfmathsetmacroproportionradin/radout
   pgfmathsetmacroouter.8818cm
   pgfmathsetmacroinner.8818cm*proportion
   pgfmathsetmacroinnerlowinner-0.01pt
   pgfdeclareradialshadingringpgfpoint0cm0cm%
   
   color(0pt)=(white);
   color(innerlow)=(white);
   color(inner)=(#1);
   color(outer)=(#3)
   
   pgfkeysalso/tikz/shading=ring
   ,
  
  
  begindocument
  begintikzpicture
  clip (-4,0) rectangle + (8,4);
  shade[draw,ring shading=from red at 2 to blue at 4]
   (0,0) circle (2) circle (4);
  endtikzpicture
  enddocument
  

  
  

which gives:

• 
  

  three color gradiend coloring, as asked in comment

  
  
  

  it is a little bit more complex, since i compose it from two circles' pairs, from which is the second is drawn on background layer. for this you need to add usetikzlibrarybackgrounds in document preamble and than the document body write for example as:

  
  
  

  begindocument
  begintikzpicture
  deflok(-4,0) arc (180:0:4cm) -- +(-2,0) arc (0:180:2cm) -- cycle
  draw lok;
  clip lok;
  shade[ring shading=from red at 2 to white at 2.9]
   (0,0) circle (2) circle (2.9);
   beginscope[on background layer]
  clip lok;
  shade[ring shading=from white at 3.1 to blue at 4]
   (0,0) circle (3.1) circle (4);
   endscope
  endtikzpicture
  enddocument
  

  
  

gives:

as you can see, rings are slightly separated that white transient is thicker. if you prefer narrower white transient, than change radius of outer and inner circles of rings from 2.9 to 3.0 and from 3.1 to 3.0 respectively. with this both rings will touch each other:

share|improve this answer

edited Aug 20 at 8:08

answered Aug 12 at 19:20

Zarko

111k861149

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Maybe the second point of OP's question could be solved with radial shading? (+1 of course)
  – Max
  Aug 12 at 19:31
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @MaxSnippe, huh, i overlooked this, :-(. i will add this asap :-)
  – Zarko
  Aug 12 at 19:33
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @MaxSnippe, adding gradient shading is not so trivial ... it will take me more time :-(.
  – Zarko
  Aug 12 at 19:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  Maybe this question could help? I don't mind, take your time :) I think OP doesn't mind either.
  – Max
  Aug 12 at 19:44
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @ChrisSewell, in this case you need to combine two pairs of circles. i will try to do this tomorrow evening.
  – Zarko
  Aug 12 at 22:06
  

  
  
  
  

 | 
show 5 more comments

up vote
9
down vote



accepted

up vote
9
down vote



accepted

edit:

• 
  

  first problem (please, one problem per question :-) )

  
  
  

  if i understand your question correctly, than you try to obtain the following image:

  
  

i interchange the start/end points of arcs and move coordinate (0,0) to the middle of image:

documentclass[tikz, margin=3mm]standalone

begindocument
 begintikzpicture
shade[thin, draw=black, top color=blue,bottom color=red]
(-4,0) arc (180:0:4cm) -- +(-2,0) arc (0:180:2cm) -- cycle;
 endtikzpicture
enddocument

• 
  

  second problem

  
  
  

  it is not trivial. temporary i'm not able to find satisfactory solution with use of arc. simple replace top color=blue,bottom color=red with inner color=red, outer control=blue doesn't gives what cab be described as radial gradient color.

  
  
  

  one way to solve this problem can be use ideas from radial shading as propose May Snippe in his comment below. so far i can only say that solution on such a way require different approach to draw your image:

  
  
  

  documentclass[tikz, margin=3mm]standalone
  
  tikzset
   ring shading/.code args=from #1 at #2 to #3 at #4
   defcolin#1
   defradin#2
   defcolout#3
   defradout#4
   pgfmathsetmacroproportionradin/radout
   pgfmathsetmacroouter.8818cm
   pgfmathsetmacroinner.8818cm*proportion
   pgfmathsetmacroinnerlowinner-0.01pt
   pgfdeclareradialshadingringpgfpoint0cm0cm%
   
   color(0pt)=(white);
   color(innerlow)=(white);
   color(inner)=(#1);
   color(outer)=(#3)
   
   pgfkeysalso/tikz/shading=ring
   ,
  
  
  begindocument
  begintikzpicture
  clip (-4,0) rectangle + (8,4);
  shade[draw,ring shading=from red at 2 to blue at 4]
   (0,0) circle (2) circle (4);
  endtikzpicture
  enddocument
  

  
  

which gives:

• 
  

  three color gradiend coloring, as asked in comment

  
  
  

  it is a little bit more complex, since i compose it from two circles' pairs, from which is the second is drawn on background layer. for this you need to add usetikzlibrarybackgrounds in document preamble and than the document body write for example as:

  
  
  

  begindocument
  begintikzpicture
  deflok(-4,0) arc (180:0:4cm) -- +(-2,0) arc (0:180:2cm) -- cycle
  draw lok;
  clip lok;
  shade[ring shading=from red at 2 to white at 2.9]
   (0,0) circle (2) circle (2.9);
   beginscope[on background layer]
  clip lok;
  shade[ring shading=from white at 3.1 to blue at 4]
   (0,0) circle (3.1) circle (4);
   endscope
  endtikzpicture
  enddocument
  

  
  

gives:

as you can see, rings are slightly separated that white transient is thicker. if you prefer narrower white transient, than change radius of outer and inner circles of rings from 2.9 to 3.0 and from 3.1 to 3.0 respectively. with this both rings will touch each other:

share|improve this answer

edited Aug 20 at 8:08

answered Aug 12 at 19:20

Zarko

111k861149

edit:

• 
  

  first problem (please, one problem per question :-) )

  
  
  

  if i understand your question correctly, than you try to obtain the following image:

  
  

i interchange the start/end points of arcs and move coordinate (0,0) to the middle of image:

documentclass[tikz, margin=3mm]standalone

begindocument
 begintikzpicture
shade[thin, draw=black, top color=blue,bottom color=red]
(-4,0) arc (180:0:4cm) -- +(-2,0) arc (0:180:2cm) -- cycle;
 endtikzpicture
enddocument

• 
  

  second problem

  
  
  

  it is not trivial. temporary i'm not able to find satisfactory solution with use of arc. simple replace top color=blue,bottom color=red with inner color=red, outer control=blue doesn't gives what cab be described as radial gradient color.

  
  
  

  one way to solve this problem can be use ideas from radial shading as propose May Snippe in his comment below. so far i can only say that solution on such a way require different approach to draw your image:

  
  
  

  documentclass[tikz, margin=3mm]standalone
  
  tikzset
   ring shading/.code args=from #1 at #2 to #3 at #4
   defcolin#1
   defradin#2
   defcolout#3
   defradout#4
   pgfmathsetmacroproportionradin/radout
   pgfmathsetmacroouter.8818cm
   pgfmathsetmacroinner.8818cm*proportion
   pgfmathsetmacroinnerlowinner-0.01pt
   pgfdeclareradialshadingringpgfpoint0cm0cm%
   
   color(0pt)=(white);
   color(innerlow)=(white);
   color(inner)=(#1);
   color(outer)=(#3)
   
   pgfkeysalso/tikz/shading=ring
   ,
  
  
  begindocument
  begintikzpicture
  clip (-4,0) rectangle + (8,4);
  shade[draw,ring shading=from red at 2 to blue at 4]
   (0,0) circle (2) circle (4);
  endtikzpicture
  enddocument
  

  
  

which gives:

• 
  

  three color gradiend coloring, as asked in comment

  
  
  

  it is a little bit more complex, since i compose it from two circles' pairs, from which is the second is drawn on background layer. for this you need to add usetikzlibrarybackgrounds in document preamble and than the document body write for example as:

  
  
  

  begindocument
  begintikzpicture
  deflok(-4,0) arc (180:0:4cm) -- +(-2,0) arc (0:180:2cm) -- cycle
  draw lok;
  clip lok;
  shade[ring shading=from red at 2 to white at 2.9]
   (0,0) circle (2) circle (2.9);
   beginscope[on background layer]
  clip lok;
  shade[ring shading=from white at 3.1 to blue at 4]
   (0,0) circle (3.1) circle (4);
   endscope
  endtikzpicture
  enddocument
  

  
  

gives:

as you can see, rings are slightly separated that white transient is thicker. if you prefer narrower white transient, than change radius of outer and inner circles of rings from 2.9 to 3.0 and from 3.1 to 3.0 respectively. with this both rings will touch each other:

share|improve this answer

edited Aug 20 at 8:08

answered Aug 12 at 19:20

Zarko

111k861149

share|improve this answer

share|improve this answer

edited Aug 20 at 8:08

edited Aug 20 at 8:08

edited Aug 20 at 8:08

answered Aug 12 at 19:20

Zarko

111k861149

answered Aug 12 at 19:20

Zarko

111k861149

answered Aug 12 at 19:20

Zarko

111k861149

111k861149

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Maybe the second point of OP's question could be solved with radial shading? (+1 of course)
  – Max
  Aug 12 at 19:31
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @MaxSnippe, huh, i overlooked this, :-(. i will add this asap :-)
  – Zarko
  Aug 12 at 19:33
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @MaxSnippe, adding gradient shading is not so trivial ... it will take me more time :-(.
  – Zarko
  Aug 12 at 19:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  Maybe this question could help? I don't mind, take your time :) I think OP doesn't mind either.
  – Max
  Aug 12 at 19:44
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @ChrisSewell, in this case you need to combine two pairs of circles. i will try to do this tomorrow evening.
  – Zarko
  Aug 12 at 22:06
  

  
  
  
  

 | 
show 5 more comments

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Maybe the second point of OP's question could be solved with radial shading? (+1 of course)
  – Max
  Aug 12 at 19:31
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @MaxSnippe, huh, i overlooked this, :-(. i will add this asap :-)
  – Zarko
  Aug 12 at 19:33
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @MaxSnippe, adding gradient shading is not so trivial ... it will take me more time :-(.
  – Zarko
  Aug 12 at 19:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  Maybe this question could help? I don't mind, take your time :) I think OP doesn't mind either.
  – Max
  Aug 12 at 19:44
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @ChrisSewell, in this case you need to combine two pairs of circles. i will try to do this tomorrow evening.
  – Zarko
  Aug 12 at 22:06
  

  
  
  
  

Maybe the second point of OP's question could be solved with radial shading? (+1 of course)
– Max
Aug 12 at 19:31

Maybe the second point of OP's question could be solved with radial shading? (+1 of course)
– Max
Aug 12 at 19:31

1

1

@MaxSnippe, huh, i overlooked this, :-(. i will add this asap :-)
– Zarko
Aug 12 at 19:33

@MaxSnippe, huh, i overlooked this, :-(. i will add this asap :-)
– Zarko
Aug 12 at 19:33

@MaxSnippe, adding gradient shading is not so trivial ... it will take me more time :-(.
– Zarko
Aug 12 at 19:39

@MaxSnippe, adding gradient shading is not so trivial ... it will take me more time :-(.
– Zarko
Aug 12 at 19:39

Maybe this question could help? I don't mind, take your time :) I think OP doesn't mind either.
– Max
Aug 12 at 19:44

Maybe this question could help? I don't mind, take your time :) I think OP doesn't mind either.
– Max
Aug 12 at 19:44

1

1

@ChrisSewell, in this case you need to combine two pairs of circles. i will try to do this tomorrow evening.
– Zarko
Aug 12 at 22:06

@ChrisSewell, in this case you need to combine two pairs of circles. i will try to do this tomorrow evening.
– Zarko
Aug 12 at 22:06

 | 
show 5 more comments

up vote
5
down vote

I'd use a color wheel for that. With transform canvas you can rotate it. Here is an animation that may help you pick your favorite rotation angle.

documentclass[tikz, margin=3.14mm]standalone 
usetikzlibraryshadings
begindocument
foreach X in 0,4,...,364
begintikzpicture
clip (-1.5,0) arc(180:0:1.5) -- (2.5,0) arc(0:180:2.5) -- cycle;
shade[shading=color wheel,transform canvas=rotate=X] 
circle (2.5cm);
endtikzpicture
enddocument

share|improve this answer

answered Aug 12 at 22:53

marmot

54.9k459119

• 
  
  
  

  
  

  
  
  
  
  
  

  
  I should maybe add that the color wheel animation appears to be less colorful than it really is (where "really" refers to the pdf version) due to the upload restrictions that limit the number of the GIF to be at most 256.
  – marmot
  Aug 13 at 1:57
  
  

  
  
  
  

add a comment | 

up vote
5
down vote

I'd use a color wheel for that. With transform canvas you can rotate it. Here is an animation that may help you pick your favorite rotation angle.

documentclass[tikz, margin=3.14mm]standalone 
usetikzlibraryshadings
begindocument
foreach X in 0,4,...,364
begintikzpicture
clip (-1.5,0) arc(180:0:1.5) -- (2.5,0) arc(0:180:2.5) -- cycle;
shade[shading=color wheel,transform canvas=rotate=X] 
circle (2.5cm);
endtikzpicture
enddocument

share|improve this answer

answered Aug 12 at 22:53

marmot

54.9k459119

• 
  
  
  

  
  

  
  
  
  
  
  

  
  I should maybe add that the color wheel animation appears to be less colorful than it really is (where "really" refers to the pdf version) due to the upload restrictions that limit the number of the GIF to be at most 256.
  – marmot
  Aug 13 at 1:57
  
  

  
  
  
  

add a comment | 

up vote
5
down vote

up vote
5
down vote

I'd use a color wheel for that. With transform canvas you can rotate it. Here is an animation that may help you pick your favorite rotation angle.

documentclass[tikz, margin=3.14mm]standalone 
usetikzlibraryshadings
begindocument
foreach X in 0,4,...,364
begintikzpicture
clip (-1.5,0) arc(180:0:1.5) -- (2.5,0) arc(0:180:2.5) -- cycle;
shade[shading=color wheel,transform canvas=rotate=X] 
circle (2.5cm);
endtikzpicture
enddocument

share|improve this answer

answered Aug 12 at 22:53

marmot

54.9k459119

I'd use a color wheel for that. With transform canvas you can rotate it. Here is an animation that may help you pick your favorite rotation angle.

documentclass[tikz, margin=3.14mm]standalone 
usetikzlibraryshadings
begindocument
foreach X in 0,4,...,364
begintikzpicture
clip (-1.5,0) arc(180:0:1.5) -- (2.5,0) arc(0:180:2.5) -- cycle;
shade[shading=color wheel,transform canvas=rotate=X] 
circle (2.5cm);
endtikzpicture
enddocument

share|improve this answer

answered Aug 12 at 22:53

marmot

54.9k459119

share|improve this answer

share|improve this answer

answered Aug 12 at 22:53

marmot

54.9k459119

answered Aug 12 at 22:53

marmot

54.9k459119

answered Aug 12 at 22:53

marmot

54.9k459119

54.9k459119

• 
  
  
  

  
  

  
  
  
  
  
  

  
  I should maybe add that the color wheel animation appears to be less colorful than it really is (where "really" refers to the pdf version) due to the upload restrictions that limit the number of the GIF to be at most 256.
  – marmot
  Aug 13 at 1:57
  
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  

  
  
  
  
  
  

  
  I should maybe add that the color wheel animation appears to be less colorful than it really is (where "really" refers to the pdf version) due to the upload restrictions that limit the number of the GIF to be at most 256.
  – marmot
  Aug 13 at 1:57
  
  

  
  
  
  

I should maybe add that the color wheel animation appears to be less colorful than it really is (where "really" refers to the pdf version) due to the upload restrictions that limit the number of the GIF to be at most 256.
– marmot
Aug 13 at 1:57

I should maybe add that the color wheel animation appears to be less colorful than it really is (where "really" refers to the pdf version) due to the upload restrictions that limit the number of the GIF to be at most 256.
– marmot
Aug 13 at 1:57

add a comment | 

 

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