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<title>Mlpost.MetaPath</title>
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<h1>Module <a href="type_Mlpost.MetaPath.html">Mlpost.MetaPath</a></h1>

<pre><span class="keyword">module</span> MetaPath: <code class="code">sig</code> <a href="Mlpost.MetaPath.html">..</a> <code class="code">end</code></pre><div class="info module top">
MetaPaths: gradually build a path with constraints, get a real
    path at thxe end.<br>
</div>
<hr width="100%">
<br>
MetaPaths are the objects used to describe lines, curves, and
      more generally almost everything that is drawn with Mlpost.
      A path (<code class="code">Path.t</code>) is defined by points and control points.
      A metapath is defined by points (knots) and constraints on the links
      between the points. A metapath is an easy way to define a path gradually
      with only a few points, and apply heuristics afterwards to transform it
      into a real path (using <code class="code">of_metapath</code>).<br>

<pre><span id="TYPEdirection"><span class="keyword">type</span> <code class="type"></code>direction</span> = <code class="type"><a href="Mlpost.Path.html#TYPEdirection">Path.direction</a></code> </pre>
<div class="info ">
A <code class="code">direction</code> is used to put constraints on metapaths:
      <ul>
<li><code class="code">vec p</code> defines a direction by a point (interpreted as a vector)</li>
<li><code class="code">curl f</code> changes the curling factor of the extremity of a metapath;
      higher curling factor means flatter curves</li>
<li><code class="code">noDir</code> means no particular direction</li>
</ul>
<br>
</div>


<pre><span id="VALvec"><span class="keyword">val</span> vec</span> : <code class="type"><a href="Mlpost.Point.html#TYPEt">Point.t</a> -> <a href="Mlpost.MetaPath.html#TYPEdirection">direction</a></code></pre>
<pre><span id="VALcurl"><span class="keyword">val</span> curl</span> : <code class="type">float -> <a href="Mlpost.MetaPath.html#TYPEdirection">direction</a></code></pre>
<pre><span id="VALnoDir"><span class="keyword">val</span> noDir</span> : <code class="type"><a href="Mlpost.MetaPath.html#TYPEdirection">direction</a></code></pre>
<pre><span id="TYPEknot"><span class="keyword">type</span> <code class="type"></code>knot</span> = <code class="type"><a href="Mlpost.Path.html#TYPEknot">Path.knot</a></code> </pre>
<div class="info ">
A <code class="code">knot</code> is the basic element of a metapath, and is simply a point
      with an incoming and outgoing direction constraint<br>
</div>


<pre><span id="VALknotp"><span class="keyword">val</span> knotp</span> : <code class="type">?l:<a href="Mlpost.MetaPath.html#TYPEdirection">direction</a> -><br>       ?r:<a href="Mlpost.MetaPath.html#TYPEdirection">direction</a> -> <a href="Mlpost.Point.html#TYPEt">Point.t</a> -> <a href="Mlpost.MetaPath.html#TYPEknot">knot</a></code></pre><div class="info ">
Build a knot from a point; the optional arguments are the
      incoming directions<br>
</div>

<pre><span id="VALknotlist"><span class="keyword">val</span> knotlist</span> : <code class="type">(<a href="Mlpost.MetaPath.html#TYPEdirection">direction</a> * <a href="Mlpost.Point.html#TYPEt">Point.t</a> * <a href="Mlpost.MetaPath.html#TYPEdirection">direction</a>) list -><br>       <a href="Mlpost.MetaPath.html#TYPEknot">knot</a> list</code></pre>
<pre><span id="TYPEjoint"><span class="keyword">type</span> <code class="type"></code>joint</span> = <code class="type"><a href="Mlpost.Path.html#TYPEjoint">Path.joint</a></code> </pre>
<div class="info ">
A joint is the connection between two knots in a metapath. It is either
      <ul>
<li><code class="code">jLine</code> for a straight line</li>
<li><code class="code">jCurve</code> for a spline curve</li>
<li><code class="code">jCurveNoInflex</code> to avoid inflexion points</li>
<li><code class="code">jTension f1 f2</code> to specify "tension" on the joint; <code class="code">jCurve</code> uses a
      default tension of 1. Higher tension means less "wild" curves</li>
<li><code class="code">jControls p1 p2</code> to explicitely specify control points</li>
</ul>
<br>
</div>


<pre><span id="VALjLine"><span class="keyword">val</span> jLine</span> : <code class="type"><a href="Mlpost.MetaPath.html#TYPEjoint">joint</a></code></pre>
<pre><span id="VALjCurve"><span class="keyword">val</span> jCurve</span> : <code class="type"><a href="Mlpost.MetaPath.html#TYPEjoint">joint</a></code></pre>
<pre><span id="VALjCurveNoInflex"><span class="keyword">val</span> jCurveNoInflex</span> : <code class="type"><a href="Mlpost.MetaPath.html#TYPEjoint">joint</a></code></pre>
<pre><span id="VALjTension"><span class="keyword">val</span> jTension</span> : <code class="type">float -> float -> <a href="Mlpost.MetaPath.html#TYPEjoint">joint</a></code></pre>
<pre><span id="VALjControls"><span class="keyword">val</span> jControls</span> : <code class="type"><a href="Mlpost.Point.html#TYPEt">Point.t</a> -> <a href="Mlpost.Point.html#TYPEt">Point.t</a> -> <a href="Mlpost.MetaPath.html#TYPEjoint">joint</a></code></pre>
<pre><span id="TYPEt"><span class="keyword">type</span> <code class="type"></code>t</span> </pre>
<div class="info ">
The abstract type of metapaths<br>
</div>


<pre><span id="TYPEpath"><span class="keyword">type</span> <code class="type"></code>path</span> = <code class="type"><a href="Mlpost.Path.html#TYPEt">Path.t</a></code> </pre>

<br>
In all the functions below :<ul>
<li>noDir is the default direction</li>
<li>jCurve is the default joint</li>
</ul>
<br>
<br>
<h2 id="2_Labelledmetapathconstructors">Labelled metapath constructors</h2><br>

<pre><span id="VALknot"><span class="keyword">val</span> knot</span> : <code class="type">?l:<a href="Mlpost.MetaPath.html#TYPEdirection">direction</a> -><br>       ?r:<a href="Mlpost.MetaPath.html#TYPEdirection">direction</a> -><br>       ?scale:(float -> <a href="Mlpost.Num.html#TYPEt">Num.t</a>) -> float * float -> <a href="Mlpost.MetaPath.html#TYPEknot">knot</a></code></pre><div class="info ">
Build a knot from a pair of floats<br>
</div>
<div class="param_info"><code class="code">l</code> : an incoming direction</div>
<div class="param_info"><code class="code">r</code> : an outgoing direction</div>
<div class="param_info"><code class="code">scale</code> : a scaling factor applied to the floats</div>

<pre><span id="VALknotn"><span class="keyword">val</span> knotn</span> : <code class="type">?l:<a href="Mlpost.MetaPath.html#TYPEdirection">direction</a> -><br>       ?r:<a href="Mlpost.MetaPath.html#TYPEdirection">direction</a> -><br>       <a href="Mlpost.Num.html#TYPEt">Num.t</a> * <a href="Mlpost.Num.html#TYPEt">Num.t</a> -> <a href="Mlpost.MetaPath.html#TYPEknot">knot</a></code></pre><div class="info ">
Build a knot from a Num.t pair; the optional arguments are as in
      <a href="Mlpost.MetaPath.html#VALknot"><code class="code">MetaPath.knot</code></a><br>
</div>

<pre><span id="VALpath"><span class="keyword">val</span> path</span> : <code class="type">?style:<a href="Mlpost.MetaPath.html#TYPEjoint">joint</a> -><br>       ?scale:(float -> <a href="Mlpost.Num.html#TYPEt">Num.t</a>) -> (float * float) list -> <a href="Mlpost.MetaPath.html#TYPEt">t</a></code></pre><div class="info ">
Build a metapath from a list of pairs of floats<br>
</div>
<div class="param_info"><code class="code">style</code> : the joint style used for all joints in the metapath</div>
<div class="param_info"><code class="code">scale</code> : permits to scale the whole metapath</div>

<pre><span id="VALpathn"><span class="keyword">val</span> pathn</span> : <code class="type">?style:<a href="Mlpost.MetaPath.html#TYPEjoint">joint</a> -><br>       (<a href="Mlpost.Num.html#TYPEt">Num.t</a> * <a href="Mlpost.Num.html#TYPEt">Num.t</a>) list -> <a href="Mlpost.MetaPath.html#TYPEt">t</a></code></pre><div class="info ">
Same as <code class="code">metapath</code>, but uses a <code class="code">Num.t</code> list<br>
</div>

<pre><span id="VALpathk"><span class="keyword">val</span> pathk</span> : <code class="type">?style:<a href="Mlpost.MetaPath.html#TYPEjoint">joint</a> -><br>       <a href="Mlpost.MetaPath.html#TYPEknot">knot</a> list -> <a href="Mlpost.MetaPath.html#TYPEt">t</a></code></pre><div class="info ">
Same as <code class="code">metapath</code>, but uses a knot list<br>
</div>

<pre><span id="VALpathp"><span class="keyword">val</span> pathp</span> : <code class="type">?style:<a href="Mlpost.MetaPath.html#TYPEjoint">joint</a> -> <a href="Mlpost.Point.html#TYPEt">Point.t</a> list -> <a href="Mlpost.MetaPath.html#TYPEt">t</a></code></pre><div class="info ">
Same as <code class="code">metapath</code> but uses a point list<br>
</div>

<pre><span id="VALjointpathk"><span class="keyword">val</span> jointpathk</span> : <code class="type"><a href="Mlpost.MetaPath.html#TYPEknot">knot</a> list -> <a href="Mlpost.MetaPath.html#TYPEjoint">joint</a> list -> <a href="Mlpost.MetaPath.html#TYPEt">t</a></code></pre><div class="info ">
Build a metapath from <code class="code">n</code> knots and <code class="code">n-1</code> joints<br>
</div>

<pre><span id="VALjointpathp"><span class="keyword">val</span> jointpathp</span> : <code class="type"><a href="Mlpost.Point.html#TYPEt">Point.t</a> list -> <a href="Mlpost.MetaPath.html#TYPEjoint">joint</a> list -> <a href="Mlpost.MetaPath.html#TYPEt">t</a></code></pre><div class="info ">
Build a metapath from <code class="code">n</code> points and <code class="code">n-1</code> joints,
      with default directions<br>
</div>

<pre><span id="VALjointpathn"><span class="keyword">val</span> jointpathn</span> : <code class="type">(<a href="Mlpost.Num.html#TYPEt">Num.t</a> * <a href="Mlpost.Num.html#TYPEt">Num.t</a>) list -><br>       <a href="Mlpost.MetaPath.html#TYPEjoint">joint</a> list -> <a href="Mlpost.MetaPath.html#TYPEt">t</a></code></pre>
<pre><span id="VALjointpath"><span class="keyword">val</span> jointpath</span> : <code class="type">?scale:(float -> <a href="Mlpost.Num.html#TYPEt">Num.t</a>) -><br>       (float * float) list -> <a href="Mlpost.MetaPath.html#TYPEjoint">joint</a> list -> <a href="Mlpost.MetaPath.html#TYPEt">t</a></code></pre><div class="info ">
Build a metapath from <code class="code">n</code> float_pairs and <code class="code">n-1</code> joints,
      with default directions<br>
</div>

<pre><span id="VALcycle"><span class="keyword">val</span> cycle</span> : <code class="type">?dir:<a href="Mlpost.MetaPath.html#TYPEdirection">direction</a> -><br>       ?style:<a href="Mlpost.MetaPath.html#TYPEjoint">joint</a> -> <a href="Mlpost.MetaPath.html#TYPEt">t</a> -> <a href="Mlpost.MetaPath.html#TYPEpath">path</a></code></pre><div class="info ">
Close a metapath using direction <code class="code">dir</code> and style <code class="code">style</code><br>
</div>
<br>
<h2 id="2_Primitivemetapathconstructors">Primitive metapath constructors</h2><br>

<pre><span id="VALconcat"><span class="keyword">val</span> concat</span> : <code class="type">?style:<a href="Mlpost.MetaPath.html#TYPEjoint">joint</a> -><br>       <a href="Mlpost.MetaPath.html#TYPEt">t</a> -> <a href="Mlpost.MetaPath.html#TYPEknot">knot</a> -> <a href="Mlpost.MetaPath.html#TYPEt">t</a></code></pre><div class="info ">
Add a knot at the end of a metapath<br>
</div>

<pre><span id="VALstart"><span class="keyword">val</span> start</span> : <code class="type"><a href="Mlpost.MetaPath.html#TYPEknot">knot</a> -> <a href="Mlpost.MetaPath.html#TYPEt">t</a></code></pre><div class="info ">
Create a simple metapath with one knot<br>
</div>

<pre><span id="VALappend"><span class="keyword">val</span> append</span> : <code class="type">?style:<a href="Mlpost.MetaPath.html#TYPEjoint">joint</a> -><br>       <a href="Mlpost.MetaPath.html#TYPEt">t</a> -> <a href="Mlpost.MetaPath.html#TYPEt">t</a> -> <a href="Mlpost.MetaPath.html#TYPEt">t</a></code></pre><div class="info ">
Append a metapath to another using joint <code class="code">style</code><br>
</div>
<br>
<h2 id="2_Predefinedvalues">Predefined values</h2><br>

<pre><span id="VALdefaultjoint"><span class="keyword">val</span> defaultjoint</span> : <code class="type"><a href="Mlpost.MetaPath.html#TYPEjoint">joint</a></code></pre><div class="info ">
The default joint style (<code class="code">JCurve</code>)<br>
</div>
<br>
<h2 id="2_Conversions">Conversions</h2><br>

<pre><span id="VALto_path"><span class="keyword">val</span> to_path</span> : <code class="type"><a href="Mlpost.MetaPath.html#TYPEt">t</a> -> <a href="Mlpost.MetaPath.html#TYPEpath">path</a></code></pre><div class="info ">
Compute the control point of the path
      for a good looking result according to the constraint
      on the direction, tension, curve<br>
</div>

<pre><span id="VALof_path"><span class="keyword">val</span> of_path</span> : <code class="type"><a href="Mlpost.MetaPath.html#TYPEpath">path</a> -> <a href="Mlpost.MetaPath.html#TYPEt">t</a></code></pre><div class="info ">
Obtain a metapath from a path with exactly the same
      control point. p = of_metapath (of_path p) is true but
      not the opposite.<br>
</div>
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