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    Imagick::getIteratorIndex

    (PECL imagick 2, PECL imagick 3)

    Imagick::getIteratorIndex — 現在アクティブな画像のインデックスを取得する

    説明

    public Imagick::getIteratorIndex(): int

    Imagick オブジェクト内で現在アクティブな画像のインデックスを取得します。 このメソッドは、ImageMagick バージョン 6.2.9 以降で Imagick をコンパイルした場合に使用可能です。

    パラメータ

    この関数にはパラメータはありません。

    戻り値

    スタック内の画像のインデックスを含む整数値を返します。

    エラー / 例外

    エラー時に ImagickException をスローします。

    例

    例1 Imagick::getIteratorIndex() の使用法

    画像を作成し、インデックスの設定と取得を行います。

    <?php
    $im     = new Imagick();
    $im->newImage(100, 100, new ImagickPixel("red"));
    $im->newImage(100, 100, new ImagickPixel("green"));
    $im->newImage(100, 100, new ImagickPixel("blue"));

    $im->setIteratorIndex(1);
    echo     $im->getIteratorIndex();
    ?>

    参考

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    User Contributed Notes 2 notes

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    1
    Michael O&#39;Connell
    9 years ago
    This will also retrieve which page number of a multipage document (i.e. PDF, PS) file the Imagick instance is currently on.  By default for a PDF it seems to be set to the last page.
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    0
    holdoffhunger at gmail dot com
    12 years ago
    The getIteratorIndex function of the ImageMagick function works on any type of image, but it is built for measuring the number of frames in an animated .gif file.  For non-animated image files, like regular .bmp or .jpg files, this function will always return the number '0', meaning that there is only one frame.  Counting starts from zero with this function, so a .gif file with five different frames will return a value of '4' on this.  Highly repetitive, but psychedelic animated GIF's are often anywhere between 10 and 30 frames, but a .gif file that is nothing more than video footage converted to a datafile may have hundreds of frames.

    According to Wikipedia (in the article for "Graphics Interchange Format"), an animated GIf image is a uses the GIF standard "which allows various images (frames) in the file to be painted with time delays."  This function won't get you the amount of time that delays between each frame, but it will give you the number of unique frames in a .gif file.  This will tell you how complicated or simple the animation may be.

    Is the 'getIteratorIndex' function not working for you?  Try the 'getImageIndex' function, which produces the same exact result.

    Some sample code :

    <?php

                    // Author: holdoffhunger@gmail.com
       
            // Imagick Type
            // ---------------------------------------------

            $imagick_type = new Imagick();
       
                // Open File
            // ---------------------------------------------
           
            $file_to_grab = "image_workshop_directory/test.gif";
       
            $file_handle_for_viewing_image_file = fopen($file_to_grab, 'a+');
       
                // Grab File
            // ---------------------------------------------

            $imagick_type->readImageFile($file_handle_for_viewing_image_file);
       
                // Get Image Type Value
            // ---------------------------------------------
           
            $image_iterator_index = $imagick_type->getIteratorIndex();
       
                // Print Image Type Value
            // ---------------------------------------------
           
            print("Number of Unique Frames in the .GIF File: $image_iterator_index");

    ?>
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