Difference between revisions of "Scaling Rotating Mirroring Clipping"

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In [http://source.contextgarden.net/tex/context/base/core-mis.tex core-mis.tex] there are some handy command for graphical text manipulation defined.
+
You can use the commands for text, but also for graphics or other “building blocks”.
  
== \scale ==
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=Scaling=
  
You can insert symbols at a reduced size in the text flow. This example creates a filled square scaled to .5 ex height
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You can insert symbols at a reduced size in the text flow.
  
<texcode>
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<context source=yes>
\definefontsynonym[Dingbats][uzdr]
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\getscaledglyph{.5}{Serif}{a} a \getscaledglyph{2}{Serif}{a}
\definesymbol[filledSq][\getglyph{Dingbats}{\char110}]
+
</context>
\def\FilledSquare%
 
    {\dontleavehmode\scale[height=0.5ex]{\symbol[filledSq]}}
 
</texcode>
 
 
 
In TeX terms, \scale creates a \hbox. If TeX is in vertical
 
mode (as it is when \startlines is in effect, because every line
 
is a paragraph by itself in the mode), then a simple \hbox is
 
not a good enough hint to make it switch to horizontal (paragraph)
 
mode.
 
 
 
Hans then posted a simpler way.
 
<texcode>
 
\getscaledglyph{.5}{Serif}{a}
 
</texcode>
 
  
{{todo|An explanation and example of the <cmd>\scale</cmd> command.}}
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= Mirroring =
 
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<context source=yes>
== \mirror ==
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There is a \mirror{\sl mirorred} {\sl word} in this sentence.
 
 
<texcode>
 
There is a \mirror{\sl mirorred} word in this sentence.
 
</texcode>
 
 
 
<context>
 
There is a \mirror{\sl mirorred} word in this sentence.
 
 
</context>
 
</context>
  
 
<code>\mirror</code> makes a <code>\hbox</code> and mirrors the contents. If you want to have a longer paragraph mirrored, you have to make a <code>\vbox</code> manually.
 
<code>\mirror</code> makes a <code>\hbox</code> and mirrors the contents. If you want to have a longer paragraph mirrored, you have to make a <code>\vbox</code> manually.
  
<texcode>
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<context source=yes>
\mirror{\vbox{Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do:
 
once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it, `and
 
what is the use of a book,' thought Alice `without pictures or conversation?'}}
 
</texcode>
 
 
 
 
 
<context>
 
 
\mirror{\vbox{Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do:  
 
\mirror{\vbox{Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do:  
 
once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it, `and  
 
once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it, `and  
Line 50: Line 22:
 
</context>
 
</context>
  
== \rotate ==
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= Rotating =
  
 
You can rotate something by an arbitrary angle by saying something like  
 
You can rotate something by an arbitrary angle by saying something like  
<texcode>
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<context source=yes>
 
\rotate[rotation=42]{the ultimate answer}
 
\rotate[rotation=42]{the ultimate answer}
</texcode>.
+
</context>
<context>
 
\rotate[rotation=42]{the ultimate answer}
 
</context>.
 
  
 
The rotation angle and the location (which determines around which point the content is rotated) are optional and can also be set by
 
The rotation angle and the location (which determines around which point the content is rotated) are optional and can also be set by
<texcode>
+
 
 +
<context source=yes>
 
\setuprotate[rotation=42,location=normal] % normal is the default
 
\setuprotate[rotation=42,location=normal] % normal is the default
 
\rotate{the ultimate answer}
 
\rotate{the ultimate answer}
</texcode>
+
</context>
 +
 
 +
==Location parameter==
  
 
An example by Hans Hagen showing the influence of <code>location=</code> argument at different angles:
 
An example by Hans Hagen showing the influence of <code>location=</code> argument at different angles:
  
<texcode>
+
<context source=yes>
 
\dostepwiserecurse{0}{359}{45}
 
\dostepwiserecurse{0}{359}{45}
 
   {\startlinecorrection[blank]
 
   {\startlinecorrection[blank]
Line 80: Line 52:
 
       \hbox to .2\hsize{\hss\ruledhbox{\rotate[location=high]  {\ruledhbox{\bfb  (high)}}}}}
 
       \hbox to .2\hsize{\hss\ruledhbox{\rotate[location=high]  {\ruledhbox{\bfb  (high)}}}}}
 
     \stoplinecorrection}
 
     \stoplinecorrection}
</texcode>
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</context>
  
<context>
 
\setuplayout[location=middle,scale=.5]
 
\dostepwiserecurse{0}{359}{45}
 
  {\startlinecorrection[blank]
 
    \hbox
 
      {\expanded{\setuprotate[rotation=\recurselevel]}%
 
      \traceboxplacementtrue
 
      \hbox to .2\hsize{\hss\ruledhbox{\rotate[location=depth] {\ruledhbox{\bfb  (depth)}}}}%
 
      \hbox to .2\hsize{\hss\ruledhbox{\rotate[location=fit]  {\ruledhbox{\bfb    (fit)}}}}%
 
      \hbox to .2\hsize{\hss\ruledhbox{\rotate[location=broad] {\ruledhbox{\bfb  (broad)}}}}%
 
      \hbox to .2\hsize{\hss\ruledhbox{\rotate[location=normal]{\ruledhbox{\bfb (normal)}}}}%
 
      \hbox to .2\hsize{\hss\ruledhbox{\rotate[location=high]  {\ruledhbox{\bfb  (high)}}}}}
 
    \stoplinecorrection}
 
</context>
 
  
 
You can rotate a long paragraph as well.
 
You can rotate a long paragraph as well.
  
{{todo|Some more comments, and an example.}}
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==In a box==
  
 
Depending on the usage you will sometimes probably want to include the content of what you wish to rotate into a box. Compare the following two examples:
 
Depending on the usage you will sometimes probably want to include the content of what you wish to rotate into a box. Compare the following two examples:
  
<texcode>
+
<context source=yes>
 
\setuplayout[width=3cm]
 
\setuplayout[width=3cm]
 
\setuprotate[rotation=180,location=broad]
 
\setuprotate[rotation=180,location=broad]
Line 109: Line 67:
 
a\rotate{e}i\par
 
a\rotate{e}i\par
 
a\rotate{\hbox{e}}i
 
a\rotate{\hbox{e}}i
 +
</context>
 +
 +
==Page dependent landscape figures==
 +
 +
Sometimes, in a double-sided portrait document, you may wish to rotate a landscape figure so that the top is towards the spine of the book – no matter whether it's on an odd or even page. In this case the {{cmd|doifoddpageelse}} command can help:
 +
 +
<texcode>
 +
\rotate[rotation=\doifoddpageelse{90}{270}]{\externalfigure[cow]}
 
</texcode>
 
</texcode>
  
<context>
+
This example is by Wolfgang, from [http://www.ntg.nl/pipermail/ntg-context/2011/059834.html the thread starting here]. The thread contains other solutions to the problem.
\setuplayout[width=3cm]
+
 
\setuprotate[rotation=180,location=broad]
+
=Clipping=
 +
 
 +
You can adjust the size of an element by cropping/clipping its borders:
 +
 
 +
<context source="yes">
 +
\clip[nx=3,ny=3,x=1,y=1]{\externalfigure[cow]}
 +
</context>
  
a\rotate{e}i\par
+
<context source="yes">
a\rotate{\hbox{e}}i
+
\setupcolors[state=start]
 +
\definedfont[SansBold at 20mm]
 +
\baselineskip 0pt % switch off the space between the stripes
 +
\lineskip 0pt
 +
\def\MyLogo{\vbox{\hbox{\CONTEXT}\null}} % null is necessary for the whole bounding box
 +
\clip[ny=3,y=1]{\color[yellow]\MyLogo}
 +
\clip[ny=3,y=2]{\color[orange]\MyLogo}
 +
\clip[ny=3,y=3]{\color[red]\MyLogo}
 
</context>
 
</context>
  
== \clip ===
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see also {{cmd|setupclipping}} and {{cmd|clip}}
 +
 
 +
=Further reading=
 +
 
 +
In [https://source.contextgarden.net/tex/context/base/mkii/core-mis.mkii core-mis.mkii] (for MkII), there are some handy commands for graphical text manipulation defined.
 +
{{todo|What is the equivalent for mkiv ?}}
  
{{todo|(defined in another file)}}
+
[[Category:Basics]]
 +
[[Category:Graphics]]

Revision as of 13:23, 9 August 2020

You can use the commands for text, but also for graphics or other “building blocks”.

Scaling

You can insert symbols at a reduced size in the text flow.

\getscaledglyph{.5}{Serif}{a} a \getscaledglyph{2}{Serif}{a}

Mirroring

There is a \mirror{\sl mirorred} {\sl word} in this sentence.

\mirror makes a \hbox and mirrors the contents. If you want to have a longer paragraph mirrored, you have to make a \vbox manually.

\mirror{\vbox{Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do: 
once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it, `and 
what is the use of a book,' thought Alice `without pictures or conversation?'}}

Rotating

You can rotate something by an arbitrary angle by saying something like

\rotate[rotation=42]{the ultimate answer}

The rotation angle and the location (which determines around which point the content is rotated) are optional and can also be set by

\setuprotate[rotation=42,location=normal] % normal is the default
\rotate{the ultimate answer}

Location parameter

An example by Hans Hagen showing the influence of location= argument at different angles:

\dostepwiserecurse{0}{359}{45}
   {\startlinecorrection[blank]
    \hbox
      {\expanded{\setuprotate[rotation=\recurselevel]}%
       \traceboxplacementtrue
       \hbox to .2\hsize{\hss\ruledhbox{\rotate[location=depth] {\ruledhbox{\bfb  (depth)}}}}%
       \hbox to .2\hsize{\hss\ruledhbox{\rotate[location=fit]   {\ruledhbox{\bfb    (fit)}}}}%
       \hbox to .2\hsize{\hss\ruledhbox{\rotate[location=broad] {\ruledhbox{\bfb  (broad)}}}}%
       \hbox to .2\hsize{\hss\ruledhbox{\rotate[location=normal]{\ruledhbox{\bfb (normal)}}}}%
       \hbox to .2\hsize{\hss\ruledhbox{\rotate[location=high]  {\ruledhbox{\bfb   (high)}}}}}
    \stoplinecorrection}


You can rotate a long paragraph as well.

In a box

Depending on the usage you will sometimes probably want to include the content of what you wish to rotate into a box. Compare the following two examples:

\setuplayout[width=3cm]
\setuprotate[rotation=180,location=broad]

a\rotate{e}i\par
a\rotate{\hbox{e}}i

Page dependent landscape figures

Sometimes, in a double-sided portrait document, you may wish to rotate a landscape figure so that the top is towards the spine of the book – no matter whether it's on an odd or even page. In this case the \doifoddpageelse command can help:

\rotate[rotation=\doifoddpageelse{90}{270}]{\externalfigure[cow]}

This example is by Wolfgang, from the thread starting here. The thread contains other solutions to the problem.

Clipping

You can adjust the size of an element by cropping/clipping its borders:

\clip[nx=3,ny=3,x=1,y=1]{\externalfigure[cow]}

\setupcolors[state=start]
\definedfont[SansBold at 20mm]
\baselineskip 0pt % switch off the space between the stripes
\lineskip 0pt
\def\MyLogo{\vbox{\hbox{\CONTEXT}\null}} % null is necessary for the whole bounding box
\clip[ny=3,y=1]{\color[yellow]\MyLogo}
\clip[ny=3,y=2]{\color[orange]\MyLogo}
\clip[ny=3,y=3]{\color[red]\MyLogo}

see also \setupclipping and \clip

Further reading

In core-mis.mkii (for MkII), there are some handy commands for graphical text manipulation defined.


TODO: What is the equivalent for mkiv ? (See: To-Do List)