php-doc-en/reference/pdf/functions/pdf-shading.xml

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  <refentry id="function.pdf-shading">
   <refnamediv>
    <refname>pdf_shading</refname>
    <refpurpose>Define blend</refpurpose>
   </refnamediv>
   <refsect1 role="description">
    &reftitle.description;
     <methodsynopsis>
      <type>int</type><methodname>pdf_shading</methodname>
      <methodparam><type>resource</type><parameter>pdfdoc</parameter></methodparam>
      <methodparam><type>string</type><parameter>shtype</parameter></methodparam>
      <methodparam><type>float</type><parameter>x0</parameter></methodparam>
      <methodparam><type>float</type><parameter>y0</parameter></methodparam>
      <methodparam><type>float</type><parameter>x1</parameter></methodparam>
      <methodparam><type>float</type><parameter>y1</parameter></methodparam>
      <methodparam><type>float</type><parameter>c1</parameter></methodparam>
      <methodparam><type>float</type><parameter>c2</parameter></methodparam>
      <methodparam><type>float</type><parameter>c3</parameter></methodparam>
      <methodparam><type>float</type><parameter>c4</parameter></methodparam>
      <methodparam><type>string</type><parameter>optlist</parameter></methodparam>
     </methodsynopsis>
    <para>
     Defines a blend from the current fill color to another color.
     For axial shadings, (<parameter>x0</parameter>, <parameter>y0</parameter>)
     and (<parameter>x1</parameter>, <parameter>y1</parameter>) are the
     coordinates of the starting and ending points of the shading. For radial
     shadings these points specify the centers of the starting and ending
     circles. <parameter>c1</parameter>, <parameter>c2</parameter>, 
     <parameter>c3</parameter>, and <parameter>c4</parameter> are the color
     values of the shading endpoint, interpreted in the current fill color
     space in the same way as the color parameters in
     <function>pdf_setcolor</function>.
    </para>
    <para>
     This function returns a shading handle that can be used in subsequent calls to <function>pdf_shading_pattern</function> and <function>pdf_shfill</function>.
    </para>
    <para>
     This function requires PDF 1.4 or above.
    </para>
   </refsect1>
  </refentry>

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