imagesetstyle

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

imagesetstyle — 设定画线的风格

说明

bool imagesetstyle ( resource $image , array $style )

imagesetstyle() 设定所有画线的函数（例如 imageline() 和 imagepolygon() ）在使用特殊颜色 IMG_COLOR_STYLED 或者用 IMG_COLOR_STYLEDBRUSHED 画一行图像时所使用的风格。

参数

image: 由图象创建函数(例如 imagecreatetruecolor() )返回的图象资源。
style: 像素组成的数组。你可以通过常量 IMG_COLOR_TRANSPARENT 来添加一个透明像素。

返回值

成功时返回 TRUE ，或者在失败时返回 FALSE 。

范例

下面的示例脚本在画布上从左上角到右下角画一行虚线：

Example #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 );

 
 $style  = array( $red ,  $red ,  $red ,  $red ,  $red ,  $w ,  $w ,  $w ,  $w ,  $w );
 imagesetstyle ( $im ,  $style );
 imageline ( $im ,  0 ,  0 ,  100 ,  100 ,  IMG_COLOR_STYLED );

 
 $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 );
 ?>

以上例程的输出类似于：

参见

imagesetbrush() - 设定画线用的画笔图像
imageline() - 画一条线段

用户评论:

[#1] Anonymous [2012-10-22 16:03:12]

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); ?>

[#2] php at imperium dot be [2010-08-06 07:05:59]

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 function ImageStyleThicken($_1,$_2) { $a = array(); foreach ($_1 as $x) { $i = $_2; do $a[] = $x; while (--$i>0); } return $a; } ?>

[#3] Wander [2007-12-13 11:12:41]

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 ?>

[#4] Michael_Todd_335 at yahoo dot com [2007-06-27 09:40:43]

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.

[#5] Cruz at FtUC dot net [2006-01-15 03:45:00]

When lines drawn with imagesetstyle seem to produce a thin white line only, make sure antialiasing is disabled.

<?php 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.

[#6] zackbloom at gmail dot com [2005-12-06 14:44:28]

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;
}