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<refentry id="cairo_set_alpha">
<refmeta>
<refentrytitle>cairo_set_alpha</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>cairo_set_alpha</refname>
<refpurpose>set opaqueness for painting</refpurpose>
</refnamediv>
<refsynopsisdiv>
<programlisting>
void cairo_set_alpha (<link linkend="cairo_t">cairo_t</link> *cr, double alpha)</programlisting>
<variablelist role="params">
<varlistentry>
<term><parameter>cr</parameter> :</term>
<listitem>
<simpara>a cairo_r</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>alpha</parameter> :</term>
<listitem>
<simpara>an alpha value between 0.0 and 1.0</simpara>
</listitem>
</varlistentry>
</variablelist>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<indexterm>
<primary>functions</primary>
<secondary>cairo_set_alpha</secondary>
</indexterm>
<indexterm>
<primary/>
</indexterm>
If alpha is not between 0.0 and 1.0 it will be restricted to fit.
</para>
</refsect1>
</refentry>
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