我想在 PHP 中创建一个小函数，它接受颜色、形状、透明度等参数并输出 PNG 图像。我听说过 PHP GD 库，但我想知道如何创建像 soon.media.mit.edu 这样有创意的东西
【问题讨论】：
This is a good example，您几乎可以使用these functions 完成所有操作。虽然可能，但创建一个像你描述的那样的图像会非常困难，因为我用渐变、循环和颜色做了一些奇怪的东西。
如果您想根据某些参数动态制作这样的图像，您始终可以事先在 Photoshop 中创建图像，然后根据用户选择的内容叠加它们。
您可以享受很多乐趣。
编辑：哦，顺便说一句，如果您有兴趣 giving an invalid parameter shows some of the python code 负责创建图像并导致错误。这是了解代码的好地方。
第二次编辑：这只是我用这种技术所做的事情。请记住，这是很久以前的事了。它接受基于查询字符串的名称，并且基本上会执行一些包含大量随机数的循环。
这是源代码，对于任何愚蠢的代码/引用，我深表歉意。这是很久以前写的，我相信当时我大约 14 岁（可能有很多缺陷）。
<?php
header("Content-type:image/jpeg");
$array=array("I am a monument to all your sins", "Currently making pizza","Best before 12/7/09", "Farming Onions");
function imagettftext_cr(&$im, $size, $angle, $x, $y, $color, $fontfile, $text)
{
// retrieve boundingbox
$bbox = imagettfbbox($size, $angle, $fontfile, $text);
// calculate deviation
$dx = ($bbox[2]-$bbox[0])/2.0 - ($bbox[2]-$bbox[4])/2.0; // deviation left-right
$dy = ($bbox[3]-$bbox[1])/2.0 + ($bbox[7]-$bbox[1])/2.0; // deviation top-bottom
// new pivotpoint
$px = $x-$dx;
$py = $y-$dy;
return imagettftext($im, $size, $angle, $px, $y, $color, $fontfile, $text);
}
$image = imagecreate(500,90);
$black = imagecolorallocate($image,0,0,0);
$grey_shade = imagecolorallocate($image,40,40,40);
$white = imagecolorallocate($image,255,255,255);
$text = $array[rand(0,sizeof($array)-1)];
// Local font files, relative to script
$otherFont = 'army1.ttf';
$font = 'army.ttf';
if($_GET['name'] == ""){ $name = "Sam152";}else{$name= $_GET['name'];}
$name = substr($name, 0, 25);
//BG text for Name
while($i<10){
imagettftext_cr($image,rand(2,40),rand(0,50),rand(10,500),rand(0,200),$grey_shade,$font,$name);
$i++;
}
//BG text for saying
while($i<10){
imagettftext_cr($image,rand(0,40),rand(90,180),rand(100,500),rand(200,500),$grey_shade,$otherFont,$text);
$i++;
}
// Main Text
imagettftext_cr($image,35,0,250,46,$white,$font,$name);
imagettftext_cr($image,10,0,250,76,$white,$otherFont,$text);
imagejpeg($image);
?>
【讨论】：
这是我之前用来生成具有两个名称的图像的代码，这些名称是从查询字符串参数中接受的。我使用准备好的背景图片并将名称放在上面。
<?php
// Print two names on the picture, which accepted by query string parameters.
$n1 = $_GET['n1'];
$n2 = $_GET['n2'];
Header ("Content-type: image/jpeg");
$image = imageCreateFromJPEG("images/someimage.jpg");
$color = ImageColorAllocate($image, 255, 255, 255);
// Calculate horizontal alignment for the names.
$BoundingBox1 = imagettfbbox(13, 0, 'ITCKRIST.TTF', $n1);
$boyX = ceil((125 - $BoundingBox1[2]) / 2); // lower left X coordinate for text
$BoundingBox2 = imagettfbbox(13, 0, 'ITCKRIST.TTF', $n2);
$girlX = ceil((107 - $BoundingBox2[2]) / 2); // lower left X coordinate for text
// Write names.
imagettftext($image, 13, 0, $boyX+25, 92, $color, 'ITCKRIST.TTF', $n1);
imagettftext($image, 13, 0, $girlX+310, 92, $color, 'ITCKRIST.TTF', $n2);
// Return output.
ImageJPEG($image, NULL, 93);
ImageDestroy($image);
?>
要在页面上显示生成的图像，您可以执行以下操作：
<img src="myDynamicImage.php?n1=bebe&n2=jake" />
【讨论】：
不是“用 PHP 做”的直接答案，但您可以调用一些强大的命令行软件从 PHP。特别是ImageMagick 将绘制包括厨房水槽在内的所有内容。它还具有可用于“带外”处理的“后端”脚本（即，在请求完成后执行图像处理（更快的用户反馈）或在深夜资源紧张时分批执行的优势。高峰时间。
【讨论】：
这是一个简单的例子：
<?php
$your_text = "Helloooo Worldddd";
$IMG = imagecreate( 250, 80 );
$background = imagecolorallocate($IMG, 0,0,255);
$text_color = imagecolorallocate($IMG, 255,255,0);
$line_color = imagecolorallocate($IMG, 128,255,0);
imagestring( $IMG, 10, 1, 25, $your_text, $text_color );
imagesetthickness ( $IMG, 5 );
imageline( $IMG, 30, 45, 165, 45, $line_color );
header( "Content-type: image/png" );
imagepng($IMG);
imagecolordeallocate($IMG, $line_color );
imagecolordeallocate($IMG, $text_color );
imagecolordeallocate($IMG, $background );
imagedestroy($IMG);
exit;
?>
【讨论】：
这并不完全是您要查找的内容，但我编写了一个脚本以将动态颜色层插入透明图像。你用单色图像“层”设置它并运行它，给它一个十六进制颜色代码。该脚本重新着色您的图层并将它们合并为一个图像以呈现。这是代码；希望你能从中得到一些用处。
function hexLighter($hex, $factor = 30) {
$new_hex = '';
$base['R'] = hexdec($hex{0}.$hex{1});
$base['G'] = hexdec($hex{2}.$hex{3});
$base['B'] = hexdec($hex{4}.$hex{5});
foreach ($base as $k => $v) {
$amount = 255 - $v;
$amount = $amount / 100;
$amount = round($amount * $factor);
$new_decimal = $v + $amount;
$new_hex_component = dechex($new_decimal);
$new_hex .= sprintf('%02.2s', $new_hex_component);
}
return $new_hex;
}
// Sanitize/Validate provided color variable
if (!isset($_GET['color']) || strlen($_GET['color']) != 6) {
header($_SERVER['SERVER_PROTOCOL'] . ' 400 Bad Request', true, 400);
exit(0);
}
if (file_exists( "cache/{$_GET['color']}.png" )) {
header( 'Content-Type: image/png' );
readfile( "cache/{$_GET['color']}.png" );
exit(0);
}
// Desired final size of image
$n_width = 50;
$n_height = 50;
// Actual size of source images
$width = 125;
$height = 125;
$image = imagecreatetruecolor($width, $height);
imagesavealpha($image, true);
imagealphablending($image, false);
$n_image = imagecreatetruecolor($n_width, $n_height);
imagesavealpha($n_image, true);
imagealphablending($n_image, false);
$black = imagecolorallocate($image, 0, 0, 0);
$transparent = imagecolorallocatealpha($image, 255, 255, 255, 127);
imagefilledrectangle($image, 0, 0, $width, $height, $transparent);
$layers = array();
$layers_processed = array();
$layers[] = array( 'src' => 'layer01.gif', 'level' => 0 ); // Border
$layers[] = array( 'src' => 'layer02.gif', 'level' => 35 ); // Background
$layers[] = array( 'src' => 'layer03.gif', 'level' => 100 ); // White Quotes
foreach ($layers as $idx => $layer) {
$img = imagecreatefromgif( $layer['src'] );
$processed = imagecreatetruecolor($width, $height);
imagesavealpha($processed, true);
imagealphablending($processed, false);
imagefilledrectangle($processed, 0, 0, $width, $height, $transparent);
$color = hexLighter( $_GET['color'], $layer['level'] );
$color = imagecolorallocate($image,
hexdec( $color{0} . $color{1} ),
hexdec( $color{2} . $color{3} ),
hexdec( $color{4} . $color{5} )
);
for ($x = 0; $x < $width; $x++)
for ($y = 0; $y < $height; $y++)
if ($black === imagecolorat($img, $x, $y))
imagesetpixel($processed, $x, $y, $color);
imagecolortransparent($processed, $transparent);
imagealphablending($processed, true);
array_push($layers_processed, $processed);
imagedestroy( $img );
}
foreach ($layers_processed as $processed) {
imagecopymerge($image, $processed, 0, 0, 0, 0, $width, $height, 100);
imagedestroy( $processed );
}
imagealphablending($image, true);
imagecopyresampled($n_image, $image, 0, 0, 0, 0, $n_width, $n_height, $width, $height);
imagealphablending($n_image, true);
header( 'Content-Type: image/png' );
imagepng( $n_image, "cache/{$_GET['color']}.png" );
imagepng( $n_image );
// Free up memory
imagedestroy( $n_image );
imagedestroy( $image );
如果您想了解有关该代码的更多信息，我的blog 上有详细说明。
【讨论】：
这是我使用动态文本创建动态 png 图像的功能... 并且可以称为-
<img src="create_image.php?s=008080_F_1000_200&t=Sample%20Image%20Drawn%20By%20PHP" alt="GD Library Example Image" >
这里是 create_image.php，它提供了请求的图像...
<?php
$setting = isset($_GET['s']) ? $_GET['s'] : "FFF_111_100_100";
$setting = explode("_",$setting );
$img = array();
switch ($n = count($setting)) {
case $n > 4 :
case 3:
$setting[3] = $setting[2];
case 4:
$img['width'] = (int) $setting[2];
$img['height'] = (int) $setting[3];
case 2:
$img['color'] = $setting[1];
$img['background'] = $setting[0];
break;
default:
list($img['background'],$img['color'],$img['width'],$img['height']) = array('F','0',100,100);
break;
}
$background = explode(",",hex2rgb($img['background']));
$color = explode(",",hex2rgb($img['color']));
$width = empty($img['width']) ? 100 : $img['width'];
$height = empty($img['height']) ? 100 : $img['height'];
$string = (string) isset($_GET['t']) ? $_GET['t'] : $width ."x". $height;
header("Content-Type: image/png");
$image = @imagecreate($width, $height)
or die("Cannot Initialize new GD image stream");
$background_color = imagecolorallocate($image, $background[0], $background[1], $background[2]);
$text_color = imagecolorallocate($image, $color[0], $color[1], $color[2]);
imagestring($image, 5, 5, 5, $string, $text_color);
imagepng($image);
imagedestroy($image);
function hex2rgb($hex) {
// Copied
$hex = str_replace("#", "", $hex);
switch (strlen($hex)) {
case 1:
$hex = $hex.$hex;
case 2:
$r = hexdec($hex);
$g = hexdec($hex);
$b = hexdec($hex);
break;
case 3:
$r = hexdec(substr($hex,0,1).substr($hex,0,1));
$g = hexdec(substr($hex,1,1).substr($hex,1,1));
$b = hexdec(substr($hex,2,1).substr($hex,2,1));
break;
default:
$r = hexdec(substr($hex,0,2));
$g = hexdec(substr($hex,2,2));
$b = hexdec(substr($hex,4,2));
break;
}
$rgb = array($r, $g, $b);
return implode(",", $rgb);
}
【讨论】：
这是一个简单的使用示例：
<?php
$your_text = "Helloooo Worldddd";
$IMG = imagecreate( 250, 80 );
$background = imagecolorallocate($IMG, 0,0,255);
$text_color = imagecolorallocate($IMG, 255,255,0);
$line_color = imagecolorallocate($IMG, 128,255,0);
imagestring( $IMG, 10, 1, 25, $your_text, $text_color );
imagesetthickness ( $IMG, 5 );
imageline( $IMG, 30, 45, 165, 45, $line_color );
header( "Content-type: image/png" );
imagepng($IMG);
imagecolordeallocate($IMG, $line_color );
imagecolordeallocate($IMG, $text_color );
imagecolordeallocate($IMG, $background );
imagedestroy($IMG);
exit;
?>
【讨论】：
您也可以使用Imagick。它在性能方面可能比 GD 库更好。
// Create new object
$im = new Imagick();
// Create new image with properties
$im->newImage( 1000, 1000, '#FF0000' );
// Write texts on it
$text_draw = new ImagickDraw();
$text_draw->setFont( 'path/to/font' );
$text_draw->setFontSize( 150 );
$text_draw->setStrokeColor('#fff');
$text_draw->setFillColor('#C0C0C0');
$im->setImageFormat( "png" );
$im->writeImage( 'path/to/save/filename.png' );
$img->destroy();
【讨论】：