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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
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<meta name="generator" content=
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<title>RMagick: RVG Reference: Transforms</title>
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<h6 id="header">RMagick User's Guide and Reference</h6>
<div class="nav">
« <a href="rvgshape.html">Prev</a> | <a href=
"index.html">Contents</a> | <a href=
"index.html">Next</a> »
</div>
<h1>The transform methods</h1>
<div id="toc">
<h2>Table of Contents</h2>
<h3>About the transform methods</h3>
<h3>Transform methods</h3>
<ul>
<li><a href="#matrix">matrix</a></li>
<li><a href="#rotate">rotate</a></li>
<li><a href="#scale">scale</a></li>
<li><a href="#skewX">skewX</a></li>
<li><a href="#skewY">skewY</a></li>
<li><a href="#translate">translate</a></li>
</ul>
</div>
<div class="subhd">
<h2>About the transform methods</h2>
</div>
<div class="intro">
<p>The default coordinate system has its origin in the
upper-left corner. The positive x-axis extends to the right.
The positive y-axis extends downward. You can change this
coordinate system by using one or more of the transform methods
described on this page. This image shows the default coordinate
system.</p>
<p><a href=
"javascript:popup('InitialCoords.rb.html')"><img src="ex/InitialCoords.gif"
title="Click to see the example script" alt=
"initial coordinates example" /></a></p>
<p>This image shows a drawing without transformations.</p>
<p><a href="javascript:popup('OrigCoordSys.rb.html')"><img src=
"ex/OrigCoordSys.gif" title="Click to see the example script"
alt="a drawing without transformations" /></a></p>
<p>The transform methods are defined in the <a href=
"rvg.html">RVG</a>, <a href="rvggroup.html">RVG::Group</a>, and
<a href="rvguse.html">RVG::Use</a> classes. You can also chain
these methods to the <a href="rvgshape.html">shape methods</a>
and to the <a href="rvgimage.html">image</a> method.</p>
</div>
<div class="subhd">
<h2>Transform methods</h2>
</div>
<div class='sig'>
<h4 id='matrix'>matrix</h4>
<p><span class="arg">obj</span>.matrix(<span class=
"arg">sx</span>, <span class="arg">rx</span>, <span class=
"arg">ry</span>, <span class="arg">sy</span>, <span class=
"arg">tx</span>, <span class="arg">ty</span>) ->
<span class="arg">obj</span></p>
</div>
<div class="desc">
<h5>Description</h5>
<p>Replaces the current transformation matrix with a new matrix
having the specified values. See the <a href=
"http://www.w3.org/TR/SVG11/coords.html#TransformAttribute">SVG
standard</a> for more information.</p>
<h5>Arguments</h5>
<dl>
<dt>sx, sy</dt>
<dd>The scale factor in the <em>x</em>-dimension and
<em>y</em>-dimension, measured in user coordinates.</dd>
<dt>rx, ry</dt>
<dd>The amount of rotation about the x-axis and y-axis,
measured in degrees.</dd>
<dt>tx, ty</dt>
<dd>The translation on the <em>x</em>-axis and the
<em>y</em>-axis, measured in user coordinates.</dd>
</dl>
</div>
<div class='sig'>
<h4 id='rotate'>rotate</h4>
<p><span class="arg">obj</span>.rotate(<span class=
"arg">angle</span>[, <span class="arg">cx</span>, <span class=
"arg">cy</span>]) -> <span class="arg">obj</span></p>
</div>
<div class="desc">
<h5>Description</h5>
<p>Rotates the axes about the origin or, if <span class=
"arg">cx</span> and <span class="arg">cy</span> are present,
about the specified point.</p>
<h5>Arguments</h5>
<dl>
<dt>angle</dt>
<dd>The amount of rotation. Positive angles rotate clockwise,
negative angles rotate counter-clockwise.</dd>
<dt>cx, cy</dt>
<dd>If present, the point to rotate about.</dd>
</dl>
<h5>Example</h5>
<p>See <a href="#scale">scale</a>.</p>
</div>
<div class='sig'>
<h4 id='scale'>scale</h4>
<p><span class="arg">obj</span>.scale(<span class=
"arg">sx</span>[, <span class="arg">sy</span>]) ->
<span class="arg">obj</span></p>
</div>
<div class="desc">
<h5>Description</h5>
<p>Scales the axes.</p>
<h5>Arguments</h5>
<dl>
<dt>sx</dt>
<dd>The amount of scaling on the <em>x</em>-axis.</dd>
<dt>sy</dt>
<dd>If present, the amount of scaling on the <em>y</em>-axis.
Otherwise defaults to <span class="arg">sx</span>.</dd>
</dl>
<h5>Example</h5>
<p><a href="javascript:popup('RotateScale.rb.html')"><img src=
"ex/RotateScale.gif" title="Click to see the example script"
alt="rotate and scale example" /></a></p>
</div>
<div class='sig'>
<h4 id='skewX'>skewX</h4>
<p><span class="arg">obj</span>.skewX(<span class=
"arg">angle</span>) -> <span class="arg">obj</span></p>
</div>
<div class="desc">
<h5>Description</h5>
<p>Skews the <em>x</em>-axis.</p>
<h5>Arguments</h5>
<dl>
<dt>angle</dt>
<dd>The skew amount, measured in degrees.</dd>
</dl>
<h5>Example</h5>
<p>See <a href="#skewY">skewY</a></p>
</div>
<div class='sig'>
<h4 id='skewY'>skewY</h4>
<p><span class="arg">obj</span>.skewY(<span class=
"arg">angle</span>) -> <span class="arg">obj</span></p>
</div>
<div class="desc">
<h5>Description</h5>
<p>Skews the <em>y</em>-axis.</p>
<h5>Arguments</h5>
<dl>
<dt>angle</dt>
<dd>The skew amount, measured in degrees.</dd>
</dl>
<h5>Example</h5>
<p><a href="javascript:popup('Skew.rb.html')"><img src=
"ex/Skew.gif" title="Click to see the example script" alt=
"skewX and skewY example" /></a></p>
</div>
<div class='sig'>
<h4 id='translate'>translate</h4>
<p><span class="arg">obj</span>.translate(<span class=
"arg">tx</span>[, <span class="arg">ty</span>]) ->
<span class="arg">obj</span></p>
</div>
<div class="desc">
<h5>Description</h5>
<p>Moves the origin.</p>
<h5>Arguments</h5>
<dl>
<dt>tx</dt>
<dd>The location of the new origin on the x-axis.</dd>
<dt>ty</dt>
<dd>The location of the new origin on the y-axis. If omitted,
defaults to <span class="arg">tx</span>.</dd>
</dl>
<h5>Example</h5>
<p><a href="javascript:popup('NewCoordSys.rb.html')"><img src=
"ex/NewCoordSys.gif" title="Click to see the example script"
alt="translate example" /></a></p>
</div>
<p class="spacer"> </p>
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"index.html">Contents</a> | <a href="index.html">Next</a>
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