php-doc-en/reference/cairo/cairocontext/curveto.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="cairocontext.curveto" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>CairoContext::curveTo</refname>
  <refname>cairo_curve_to</refname>
  <refpurpose>Adds a curve</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <para>&style.oop; (method):</para>
   <methodsynopsis>
   <modifier>public</modifier> <type>void</type><methodname>CairoContext::curveTo</methodname>
   <methodparam><type>float</type><parameter>x1</parameter></methodparam>
   <methodparam><type>float</type><parameter>y1</parameter></methodparam>
   <methodparam><type>float</type><parameter>x2</parameter></methodparam>
   <methodparam><type>float</type><parameter>y2</parameter></methodparam>
   <methodparam><type>float</type><parameter>x3</parameter></methodparam>
   <methodparam><type>float</type><parameter>y3</parameter></methodparam>
   </methodsynopsis>
  <para>&style.procedural;:</para>
  <methodsynopsis>
   <type>void</type><methodname>cairo_curve_to</methodname>
   <methodparam><type>CairoContext</type><parameter>context</parameter></methodparam>
   <methodparam><type>float</type><parameter>x1</parameter></methodparam>
   <methodparam><type>float</type><parameter>y1</parameter></methodparam>
   <methodparam><type>float</type><parameter>x2</parameter></methodparam>
   <methodparam><type>float</type><parameter>y2</parameter></methodparam>
   <methodparam><type>float</type><parameter>x3</parameter></methodparam>
   <methodparam><type>float</type><parameter>y3</parameter></methodparam>
  </methodsynopsis>
  <para>
   Adds a cubic Bezier spline to the path from the current point to position <parameter>x3</parameter>
   ,<parameter>y3</parameter> in user-space coordinates, using <parameter>x1</parameter>,
   <parameter>y1</parameter> and <parameter>x2</parameter>, <parameter>y2</parameter> as the control
   points. After this call the current point will be <parameter>x3</parameter>, <parameter>y3</parameter>.
  </para>
  <para>
    If there is no current point before the call to <methodname>CairoContext::curveTo</methodname>
    this function will behave as if preceded by a call to <methodname>CairoContext::moveTo</methodname>
    (<parameter>x1</parameter>, <parameter>y1</parameter>).
  </para>
 
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>context</parameter></term>
     <listitem>
      <para>
       A valid <classname>CairoContext</classname> object created with
       <methodname>CairoContext::__construct</methodname> or <function>cairo_create</function>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>x1</parameter></term>
     <listitem>
      <para>
       First control point in the x axis for the curve
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>y1</parameter></term>
     <listitem>
      <para>
       First control point in the y axis for the curve
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>x2</parameter></term>
     <listitem>
      <para>
       Second control point in x axis for the curve
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>y2</parameter></term>
     <listitem>
      <para>
       Second control point in y axis for the curve
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>x3</parameter></term>
     <listitem>
      <para>
       Final point in the x axis for the curve
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>y3</parameter></term>
     <listitem>
      <para>
       Final point in the y axis for the curve
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.void;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>&style.oop;</title>
    <programlisting role="php">
<![CDATA[
<?php
$s = new CairoImageSurface(CairoFormat::ARGB32, 100, 100);
$c = new CairoContext($s);

$c->setSourceRgb(0, 0, 0);

$c->paint();

$c->moveTo(10, 50); 
$c->setLineWidth(5);
$c->setSourceRgb(.1, 0, 1);
$c->curveTo(20, 80, 80, 20, 90, 50); 
$c->stroke();

$s->writeToPng(dirname(__FILE__) . '/curveTo.png');
?>
]]>
     </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title>&style.procedural;</title>
    <programlisting role="php">
<![CDATA[
<?php

$s = cairo_image_surface_create(CAIRO_SURFACE_TYPE_IMAGE, 100, 100);
$c = cairo_create($s);

cairo_set_source_rgb($c, 0, 0, 0);

cairo_paint($c);

cairo_move_to($c, 10, 50);
cairo_set_line_width($c, 5);
cairo_set_source_rgb($c, .1, 0, 1);
cairo_curve_to($c, 20, 80, 80, 20, 90, 50);
cairo_stroke($c);

cairo_surface_write_to_png($s, dirname(__FILE__) . '/curve_to.png');
?>
]]>
     </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><methodname>CairoContext::moveTo</methodname></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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