PHPのお勉強！

PHP TOP
PHP 8.4.2 Released!

    imagesetstyle

    (PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

    imagesetstyle — 線描画用のスタイルを設定する

    説明

    imagesetstyle(GdImage $image, array $style): bool

    imagesetstyle() は、特別な IMG_COLOR_STYLED または色を有するイメージの線 IMG_COLOR_STYLEDBRUSHED を描画する際に (imageline() と imagepolygon() のような) 全ての線描画関数で使用されるスタイルを設定します。

    パラメータ

    image

    imagecreatetruecolor()のような画像作成関数が返す GdImage オブジェクト。

    style

    はピクセルの配列です。定数 IMG_COLOR_TRANSPARENT を使用すると、透明なピクセルを追加できます。 style は空の配列にしてはいけません。

    戻り値

    成功した場合に true を、失敗した場合に false を返します。

    例

    以下の例は、キャンバスの左上から右下隅に破線を描画するスクリプトです。

    例1 imagesetstyle() の例

    <?php
    header    ("Content-type: image/jpeg");
    $im = imagecreatetruecolor(100, 100);
    $w = imagecolorallocate($im, 255, 255, 255);
    $red = imagecolorallocate($im, 255, 0, 0);

    /* 5 ピクセルの赤線と 5 ピクセルの白線の破線を描画します */
    $style = array($red, $red, $red, $red, $red, $w, $w, $w, $w, $w);
    imagesetstyle($im, $style);
    imageline($im, 0, 0, 100, 100, IMG_COLOR_STYLED);

    /* imagesetstyle を併用した imagesetbrush() を使用して happy face の線を描画します */
    $style = array($w, $w, $w, $w, $w, $w, $w, $w, $w, $w, $w, $w, $red);
    imagesetstyle($im, $style);

    $brush = imagecreatefrompng("http://www.libpng.org/pub/png/images/smile.happy.png");
    $w2 = imagecolorallocate($brush, 255, 255, 255);
    imagecolortransparent($brush, $w2);
    imagesetbrush($im, $brush);
    imageline($im, 100, 0, 0, 100, IMG_COLOR_STYLEDBRUSHED);

    imagejpeg($im);
    imagedestroy($im);
    ?>

    上の例の出力は、 たとえば以下のようになります。

    出力例 : imagesetstyle()

    参考

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes 7 notes

    up
    1
    Michael_Todd_335 at yahoo dot com
    17 years ago
    Watch out! If you pass imagesetstyle() an empty array as the second argument, it will crash your server!
    I was messing with it just earlier and accidentally did so, and the page took a good minute to process, when my Apache server came up with the good ol' Windows 'Send Error Report' window.
    up
    0
    dazbert
    7 years ago
    To clarify, for lines where the thickness is greater than 1, the total length of the $style array needs to be an exact divisor of the length of the line.

    This is because the pattern is repeated lengthways and wraps onto the second row of pixels, causing staggering to occur.

    So if you have 5 red and 5 white pixels, and you want a line length of 55 pixels, either change the length to a multiple of 10, or change the dashes to, say, 6 red and 5 white.
    up
    0
    Anonymous
    12 years ago
    a shortcut for basic dashed lines, making it easy to adjust the lengths:

    <?php

    $length1     = 20;
    $length2 = 10;
    $style = array_merge(array_fill(0, $length1, $red), array_fill(0, $length2, $w));
    imagesetstyle($im, $style);

    ?>
    up
    -1
    Wander
    17 years ago
    Function to make a line with random fading:

    <?php
    function fading_line($img,$sx,$sy,$ex,$ey){
    $r=rand(0,5);$g=rand(0,5);$b=rand(0,5);
    $l=sqrt((($ex-$sx)*($ex-$sx))+(($ey-$sy)*($ey-$sy)));
    for(    $i=0;$i<$l;$i++){
    $a = array(255-((255/$l)*$i), 255,0,(255/$l)*$i/2,(255/$l)*$i,(255-((255/$l)*$i))/2);
    $style[]=imagecolorallocate($img,$a[$r],$a[$g],$a[$b]);
    }
    imagesetstyle($img,$style);
    imageline($img,$sx,$sy,$ex,$ey,IMG_COLOR_STYLED);
    }

    fading_line($img,10,20,490,40); // image, start x, start y, end x, end y
    ?>
    up
    -1
    Cruz at FtUC dot net
    18 years ago
    When lines drawn with imagesetstyle seem to produce a thin white line only, make sure antialiasing is disabled.

    <?
    imageantialias($im, false);
    $style = array($gridxcolor, $gridxcolor, IMG_COLOR_TRANSPARENT, IMG_COLOR_TRANSPARENT);
    imagesetstyle($im, $style);
    imageline($im, $x, 0, $x, $ymax+5, IMG_COLOR_STYLED);
    imageantialias($im, true);
    ?>

    Setstyle and Antialias don't go together.
    up
    -2
    php at imperium dot be
    14 years ago
    Be aware that styles are applied towards the width of the line instead of linear.
    To convert a style to be used for thick lines you can use the function below:

    <?php
    /*
    ImageStyleThicken(<aStyle>,<iThickness>) --> <aThickStyle>

    <aStyle> is the style array for a thickness of 1 (see imagesetstyle()).
    <iThickness> is the new thickness to apply (see imagesetthickness()).

    <aThickStyle> is the style array suitable for the given thickness.
    */
    function ImageStyleThicken($_1,$_2) {
    $a = array();
    foreach (    $_1 as $x) {
    $i = $_2;
    do     $a[] = $x; while (--$i>0); }
    return     $a;
    }
    ?>
    up
    -1
    zackbloom at gmail dot com
    19 years ago
    Use this to set the style to any combination of pixels.
    You can pass as many modifiers as you wish.
    Use the format [num]r[red]g[green]b[blue].

    For example:

    $im=dashed($im,"4r255g0b0","2r0g255b0","5r0g0b255");
    imageline($im, 0, 0, 600, 600, IMG_COLOR_STYLED);

    function dashed($im){
    $size = func_num_args();
    for($i = 0; $i < $size; $i++){
    $arg = func_get_arg($i);
    if(!is_resource($arg)){
    $r=substr($arg,strpos($arg,"r")+1,
    strpos($arg,"g")-strpos($arg,"r")-1);
    $g=substr($arg,strpos($arg,"g")+1,
    strpos($arg,"b")-strpos($arg,"g")-1);
    $b=substr($arg,strpos($arg,"b")+1,
    strlen($arg)-strpos($arg,"b"));
    $color = imagecolorallocate($im,$r,$g,$b);
    $x = substr($arg,0,strpos($arg,"r"));
    $vals[$i] = array_fill(0,$x,$color);
    }
    }
    for($k=0;$k<count($vals)+1;$k++)
    if(array_key_exists($k,$vals)) $prop=array_merge($prop,$vals[$k]);
    imagesetstyle($im, $prop);
    return $im;
    }
    ＋add a note