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c030e2adf7
- All id attributes are now xml:id - Add docbook namespace to all root elements - Replace <ulink /> with <link xlink:href /> - Minor markup fixes here and there git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@238160 c90b9560-bf6c-de11-be94-00142212c4b1
266 lines
7.2 KiB
XML
266 lines
7.2 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.11 $ -->
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<refentry xml:id="function.imagecopyresampled" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>imagecopyresampled</refname>
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<refpurpose>Copy and resize part of an image with resampling</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>imagecopyresampled</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>imagecopyresampled</function> copies a rectangular
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portion of one image to another image, smoothly interpolating pixel
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values so that, in particular, reducing the size of an image still
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retains a great deal of clarity.
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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>Simple example</title>
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<para>
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This example will resample an image to half its original 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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// The file
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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 dimensions
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list($width, $height) = getimagesize($filename);
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$new_width = $width * $percent;
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$new_height = $height * $percent;
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// Resample
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$image_p = imagecreatetruecolor($new_width, $new_height);
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$image = imagecreatefromjpeg($filename);
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imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
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// Output
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imagejpeg($image_p, null, 100);
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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="figures/image.imagecopyresampled.png"/>
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</imageobject>
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</mediaobject>
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</example>
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</para>
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<para>
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<example>
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<title>Resampling an image proportionally</title>
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<para>
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This example will display an image with the maximum width,
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or height, of 200 pixels.
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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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// The file
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$filename = 'test.jpg';
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// Set a maximum height and width
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$width = 200;
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$height = 200;
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// Content type
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header('Content-type: image/jpeg');
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// Get new dimensions
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list($width_orig, $height_orig) = getimagesize($filename);
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$ratio_orig = $width_orig/$height_orig;
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if ($width/$height > $ratio_orig) {
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$width = $height*$ratio_orig;
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} else {
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$height = $width/$ratio_orig;
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}
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// Resample
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$image_p = imagecreatetruecolor($width, $height);
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$image = imagecreatefromjpeg($filename);
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imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
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// Output
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imagejpeg($image_p, null, 100);
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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="figures/image.imagecopyresampled_2.png"/>
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</imageobject>
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</mediaobject>
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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>imagecopyresized</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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