imagesetstyle

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

imagesetstyle — 设定线条的样式

说明

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

imagesetstyle() 设定所有线条函数（例如 imageline() 和 imagepolygon()）在使用特殊颜色 IMG_COLOR_STYLED 或者颜色为 IMG_COLOR_STYLEDBRUSHED 绘制图像线条的样式。

参数

image: 由图象创建函数(例如imagecreatetruecolor())返回的 GdImage 对象。
style: 像素颜色组成的数组。可以通过常量 IMG_COLOR_TRANSPARENT 来添加透明像素。注意 style 不能是空 array。

返回值

成功时返回 true，或者在失败时返回 false。

示例

下面的示例脚本在画布上从左上角到右下角画一行虚线：

示例 #1 imagesetstyle() 例子

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

/* 画一条虚线，5 个红色像素，5 个白色像素 */
$style = array($red, $red, $red, $red, $red, $w, $w, $w, $w, $w);
imagesetstyle($im, $style);
imageline($im, 0, 0, 100, 100, IMG_COLOR_STYLED);

/* 用 imagesetbrush() 和 imagesetstyle 画一行笑脸 */
$style = array($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);
?>

以上示例的输出类似于：

参见

imagesetbrush() - 为线条设置笔刷图像
imageline() - 绘制直线

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User Contributed Notes 7 notes

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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.

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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.

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-1

Wander ¶

16 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
?>

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-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.

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-1

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);

?>

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-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;

}

?>

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-1

zackbloom at gmail dot com ¶

18 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;
}

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