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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@275914 c90b9560-bf6c-de11-be94-00142212c4b1
232 lines
6.8 KiB
XML
232 lines
6.8 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.16 $ -->
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<refentry xml:id="function.imagecopyresized" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>imagecopyresized</refname>
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<refpurpose>Copy and resize part of an image</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>bool</type><methodname>imagecopyresized</methodname>
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<methodparam><type>resource</type><parameter>dst_image</parameter></methodparam>
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<methodparam><type>resource</type><parameter>src_image</parameter></methodparam>
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<methodparam><type>int</type><parameter>dst_x</parameter></methodparam>
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<methodparam><type>int</type><parameter>dst_y</parameter></methodparam>
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<methodparam><type>int</type><parameter>src_x</parameter></methodparam>
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<methodparam><type>int</type><parameter>src_y</parameter></methodparam>
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<methodparam><type>int</type><parameter>dst_w</parameter></methodparam>
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<methodparam><type>int</type><parameter>dst_h</parameter></methodparam>
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<methodparam><type>int</type><parameter>src_w</parameter></methodparam>
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<methodparam><type>int</type><parameter>src_h</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>imagecopyresized</function> copies a rectangular
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portion of one image to another image.
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<parameter>dst_image</parameter> is the destination image,
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<parameter>src_image</parameter> is the source image identifier.
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</para>
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<para>
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In other words, <function>imagecopyresized</function> will take an
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rectangular area from <parameter>src_image</parameter> of width
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<parameter>src_w</parameter> and height <parameter>src_h</parameter> at
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position (<parameter>src_x</parameter>,<parameter>src_y</parameter>)
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and place it in a rectangular area of <parameter>dst_image</parameter>
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of width <parameter>dst_w</parameter> and height <parameter>dst_h</parameter>
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at position (<parameter>dst_x</parameter>,<parameter>dst_y</parameter>).
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</para>
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<para>
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If the source and destination coordinates and width and heights
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differ, appropriate stretching or shrinking of the image fragment
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will be performed. The coordinates refer to the upper left
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corner. This function can be used to copy regions within the
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same image (if <parameter>dst_image</parameter> is the same as
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<parameter>src_image</parameter>) but if the regions overlap the
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results will be unpredictable.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>dst_im</parameter></term>
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<listitem>
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<para>
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Destination image link resource.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>src_im</parameter></term>
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<listitem>
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<para>
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Source image link resource.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>dst_x</parameter></term>
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<listitem>
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<para>
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x-coordinate of destination point.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>dst_y</parameter></term>
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<listitem>
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<para>
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y-coordinate of destination point.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>src_x</parameter></term>
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<listitem>
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<para>
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x-coordinate of source point.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>src_y</parameter></term>
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<listitem>
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<para>
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y-coordinate of source point.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>dst_w</parameter></term>
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<listitem>
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<para>
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Destination width.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>dst_h</parameter></term>
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<listitem>
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<para>
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Destination height.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>src_w</parameter></term>
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<listitem>
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<para>
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Source width.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>src_h</parameter></term>
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<listitem>
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<para>
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Source height.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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&return.success;
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>Resizing an image</title>
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<para>
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This example will display the image at half size.
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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// File and new size
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$filename = 'test.jpg';
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$percent = 0.5;
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// Content type
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header('Content-type: image/jpeg');
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// Get new sizes
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list($width, $height) = getimagesize($filename);
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$newwidth = $width * $percent;
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$newheight = $height * $percent;
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// Load
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$thumb = imagecreatetruecolor($newwidth, $newheight);
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$source = imagecreatefromjpeg($filename);
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// Resize
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imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
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// Output
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imagejpeg($thumb);
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?>
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]]>
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</programlisting>
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&example.outputs.similar;
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<mediaobject>
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<imageobject>
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<imagedata fileref="en/reference/image/figures/imagecopyresized.jpg"/>
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</imageobject>
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</mediaobject>
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<para>
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The image will be output at half size, though better
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quality could be obtained using <function>imagecopyresampled</function>.
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</para>
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</example>
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</para>
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</refsect1>
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<refsect1 role="notes">
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&reftitle.notes;
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<note>
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<para>
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There is a problem due to palette image limitations (255+1 colors).
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Resampling or filtering an image commonly needs more colors than 255, a
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kind of approximation is used to calculate the new resampled pixel and its
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color. With a palette image we try to allocate a new color, if that
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failed, we choose the closest (in theory) computed color. This is
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not always the closest visual color. That may produce a weird result, like
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blank (or visually blank) images. To skip this problem, please use a
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truecolor image as a destination image, such as one created by
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<function>imagecreatetruecolor</function>.
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</para>
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</note>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<function>imagecopyresampled</function>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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