php生成缩略图,文本转换成图形
这是一款老外的经典的php生成缩略图类函数,文件灵活实用,可以生成任何风格的图片,并且可以把文本转换成图形.
php生成缩略图,文本转换成图形实例代码如下:
<?php
/*copyright : smart-info limited. all right reserved.
author : jacky cheung
version : 1.1
create date : 24 september 2008
last modify : 15 march 2009
*/
class gd {
var $font_face = "";
var $text = "";
var $size = 12;
var $color = "#000000";
var $angle = 0;
var $width = 0;
var $height = 0;
var $line_height = 0;
var $type = "png";
var $chmod = 0777;
var $bg_color = "#ffffff";
var $quality = 95;
var $antialias = true;
var $x = 0;
var $y = 0;
/*___| convert text to image |___*/
public function text2image($font_face = "", $text = "", $attributes = false, $width = 0, $all = false) {
$this->font_face = $font_face;
$this->text = $text;
$this->width = $width;
$this->size = 12;
$this->color = "#000000";
$this->angle = 0;
$this->line_height = 0;
$this->setprop($attributes);
if ($this->width == 0) {
return $this->convert_text2image($this->text, $this->check_text_width($this->text));
} else {
// word wrap
if ($all === false) {
$text = split(" ", $this->text);
$text = $this->word_wrap($this->text, $this->width, "<br>");
$text = split("<br>", $text);
} else if ($all === true) {
$temp = array();
for ($i = 0; $i < strlen($this->text); $i++) {
array_push($temp, mb_substr($this->text, $i, 1, "utf-8"));
}
$text = array();
$count_width = 0;
$i = 0;
foreach ($temp as $k => $t) {
$prop = $this->check_text_width($t);
if ($count_width + floatval($prop["width"]) < $this->width) {
$text[$i] = $text[$i] . $t;
$count_width+= floatval($prop["width"]);
} else {
$count_width = 0;
$i++;
$text[$i] = "";
}
}
}
$img = array();
foreach ($text as $k => $t) {
$img[$k] = $this->convert_text2image($t, $this->check_text_width($t));
}
$w = 0;
$h = 0;
foreach ($img as $k => $v) {
$w = (imagesx($img[$k]) > $w) ? imagesx($img[$k]) : $w;
if ($this->line_height == 0) $h+= imagesy($img[$k]);
else $h+= ($k < count($img) - 1) ? $this->line_height : imagesy($img[$k]);
}
$base_img = $this->createtransparent($w, $h);
$locy = 0;
foreach ($img as $k => $v) {
if ($k > 0) {
$locy = ($this->line_height == 0) ? $locy + imagesy($img[$k]) : $locy + $this->line_height;
}
$base_img = $this->attachgdimage($img[$k], $base_img, array(
"x" => 0,
"y" => $locy
));
}
return $base_img;
}
}
private function word_wrap($str, $width, $break) {
$formatted = '';
$position = - 1;
$prev_position = 0;
$last_line = - 1;
/// looping the string stop at each space
while ($position = mb_stripos($str, " ", ++$position, 'utf-8')) {
if ($position > $last_line + $width + 1) {
$formatted.= mb_substr($str, $last_line + 1, $prev_position - $last_line - 1, 'utf-8') . $break;
$last_line = $prev_position;
}
$prev_position = $position;
}
/// adding last line without the break
$formatted.= mb_substr($str, $last_line + 1, mb_strlen($str) , 'utf-8');
return $formatted;
}
public function convert_text2image($text, $prop) {
$im = imagecreatetruecolor($prop["width"], $prop["height"]);
$rgb = $this->getrgb($this->color);
$color = imagecolorallocate($im, $rgb["red"], $rgb["green"], $rgb["blue"]);
$img = $this->createtransparent($prop["width"], $prop["height"]);
imagettftext($img, $this->size, $this->angle, 0, $prop["height"] - abs($prop["top"]) , $color, $this->font_face, $text);
return $img;
}
public function check_text_width($text) {
$prop = array();
$bbox = imagettfbbox($this->size, $this->angle, $this->font_face, $text);
$prop["left"] = $bbox[0];
$prop["right"] = $bbox[2];
$prop["top"] = $bbox[1];
$prop["bottom"] = $bbox[7];
$padding = 2;
$prop["width"] = abs($prop["left"]) + abs($prop["right"]) + $padding;
$prop["height"] = abs($prop["top"]) + abs($prop["bottom"]) + $padding;
return $prop;
}
/*___| save to image file |___*/
public function save($gdimage, $filename, $attributes = false) {
$this->type = "png";
$this->chmod = 0777;
$this->bg_color = "#ffffff";
$this->quality = 95;
$this->antialias = true;
$this->setprop($attributes);
// process
switch (strtolower($this->type)) {
case "jpeg":
case "jpg":
$gdimage = $this->createbackground($gdimage, imagesx($gdimage) , imagesy($gdimage));
imagejpeg($gdimage, $filename, $this->quality);
break;
case "gif":
$gdimage = $this->createbackground($gdimage, imagesx($gdimage) , imagesy($gdimage));
imagegif($gdimage, $filename);
break;
case "png":
default:
imagepng($gdimage, $filename);
break;
}
chmod($filename, $this->chmod);
}
/*___| create gd background image |___*/
public function createbackground($gdimage, $width, $height) {
$img = imagecreatetruecolor($width, $height);
$rgb = $this->getrgb($this->bg_color);
$color = imagecolorallocate($img, $rgb["red"], $rgb["green"], $rgb["blue"]);
imagefill($img, 0, 0, $color);
imagecopyresampled($img, $gdimage, 0, 0, 0, 0, $width, $height, $width, $height);
return $img;
}
/*___| create gd transparent image |___*/
public function createtransparent($width, $height) {
$img = imagecreatetruecolor($width, $height);
imagealphablending($img, false);
imagesavealpha($img, true);
$transparent = imagecolorallocatealpha($img, 0, 0, 0, 127);
imagefilledrectangle($img, 0, 0, $width, $height, $transparent);
imagecopyresampled($img, $img, 0, 0, 0, 0, $width, $height, $width, $height);
return $img;
}
/*___| load image |___*/
public function createimagefrom($filename, $alpha = true) {
if (function_exists("exif_imagetype")) {
if (exif_imagetype($filename) == imagetype_jpeg) {
return $this->createfromjpeg($filename);
} else if (exif_imagetype($filename) == imagetype_gif) {
return $this->createfromgif($filename);
} else if (exif_imagetype($filename) == imagetype_png) {
return $this->createfrompng($filename, $alpha);
}
} else {
if (strstr(strtoupper($filename) , ".jpg") || strstr(strtoupper($filename) , ".jpeg")) {
return $this->createfromjpeg($filename);
} else if (strstr(strtoupper($filename) , ".gif")) {
return $this->createfromgif($filename);
} else if (strstr(strtoupper($filename) , ".png")) {
return $this->createfrompng($filename, $alpha);
}
}
return false;
}
private function createfromjpeg($filename) {
return imagecreatefromjpeg($filename);
}
private function createfromgif($filename) {
return imagecreatefromgif($filename);
}
private function createfrompng($filename, $alpha = true) {
if ($alpha) {
list($width, $height) = getimagesize($filename);
$png_img = imagecreatefrompng($filename);
$img = imagecreatetruecolor($width, $height);
imagealphablending($img, false);
imagesavealpha($img, true);
imagecopyresampled($img, $png_img, 0, 0, 0, 0, $width, $height, $width, $height);
} else {
$img = imagecreatefrompng($filename);
}
return $img;
}
/*___| attach background image |___*/
public function attachbackgroundimage($gdimage, $filename, $attributes = false) {
$this->x = 0;
$this->y = 0;
$this->setprop($attributes);
$img = $this->createimagefrom($filename);
imagecopyresampled($img, $gdimage, $this->x, $this->y, 0, 0, imagesx($gdimage) , imagesy($gdimage) , imagesx($gdimage) , imagesy($gdimage));
return $img;
}
/*___| attach image |___*/
public function attachimage($source, $target, $filename, $image_attributes = false, $attributes = false) {
$source_img = $this->createimagefrom($source);
$target_img = $this->attachbackgroundimage($source_img, $target, $attributes);
$this->save($target_img, $filename, $image_attributes);
}
/*___| attach gd image resource |___*/
public function attachgdimage($gd_source, $gd_target, $attributes = false) {
$this->x = 0;
$this->y = 0;
$this->width = 0;
$this->height = 0;
$this->setprop($attributes);
imagealphablending($gd_target, true);
imagealphablending($gd_source, true);
imagecopy($gd_target, $gd_source, $this->x, $this->y, 0, 0, imagesx($gd_source) , imagesy($gd_source));
return $gd_target;
}
/*___| get rgb color |___*/
public function getrgb($hex) {
$rgb["red"] = hexdec(substr($hex, 1, 2));
$rgb["green"] = hexdec(substr($hex, 3, 2));
$rgb["blue"] = hexdec(substr($hex, 5, 2));
return $rgb;
}
/*___| set properties |___*/
private function setprop($attributes = false) {
if ($attributes) {
foreach ($attributes as $key => $value) {
$k = strtoupper($key);
$this->$k = $value;
}
}
}
}
//开源代码phprm.com
//调用 方法代码如下:
$imgresize = new imagetransform();
$imgresize->sourcefile = $source . $file;
$imgresize->targetfile = $destination . $file;
$imgresize->chmodvalue = 0777;
$imgresize->resizetowidth = $tw;
$imgresize->resizetoheight = $th;
$imgresize->jpegoutputquality = 100;
$imgresize->resizeifsmaller = false;
$imgresize->resize();教程网址:http://www.phprm.com/tuxiang/fs4473.html
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