php_imagick实现图片剪切、旋转、锐化、减色或增加特效的方法

open('a.gif'); $image->resize_to(100,100,'scale_fill'); $image->add_text('1024i.com',10,20); $image->add_watermark('1024i.gif',50); $image->save_to('x.gif'); imagick.class.php

// 析构函数
public function __destruct()
{
if($this->image!==null) $this->image->destroy();
}
// 载入图像
public function open($path)
{
$this->image = new Imagick( $path );
if($this->image)
{
$this->type = strtolower($this->image->getImageFormat());
}
return $this->image;
}

public function crop($x=0,$y=0,$width=null,$height=null)
{
if($width==null) $width = $this->image->getImageWidth()-$x;
if($height==null) $height = $this->image->getImageHeight()-$y;
if($width<=0 || $height<=0) return;

if($this->type=='gif')
{
$image = $this->image;
$canvas = new Imagick();

$images = $image->coalesceImages();
foreach($images as $frame){
$img = new Imagick();
$img->readImageBlob($frame);
$img->cropImage($width,$height,$x,$y);
$canvas->addImage( $img );
$canvas->setImageDelay( $img->getImageDelay() );
$canvas->setImagePage($width,0);
}

$image->destroy();
$this->image = $canvas;
}
else
{
$this->image->cropImage($width,$y);
}
}
/*

• 更改图像大小
  $fit: 适应大小方式
  'force': 把图片强制变形成 $width X $height 大小
  'scale': 按比例在安全框 $width X $height 内缩放图片,输出缩放后图像大小 不完全等于 $width X $height
  'scale_fill': 按比例在安全框 $width X $height 内缩放图片，安全框内没有像素的地方填充色,使用此参数时可设置背景填充色 $bg_color = array(255,255,255)(红,绿,蓝,透明度) 透明度(0不透明-127完全透明))
  其它: 智能模能 缩放图像并载取图像的中间部分 $width X $height 像素大小
  $fit = 'force','scale','scale_fill' 时： 输出完整图像
  $fit = 图像方位值 时,输出指定位置部分图像
  字母与图像的对应关系如下:

north_west north north_east

west center east

south_west south south_east

*/
public function resize_to($width = 100,$height = 100,$fit = 'center',$fill_color = array(255,0) )
{

switch($fit)
{
case 'force':
if($this->type=='gif')
{
$image = $this->image;
$canvas = new Imagick();

$images = $image->coalesceImages();
foreach($images as $frame){
$img = new Imagick();
$img->readImageBlob($frame);
$img->thumbnailImage( $width,false );
$canvas->addImage( $img );
$canvas->setImageDelay( $img->getImageDelay() );
}
$image->destroy();
$this->image = $canvas;
}
else
{
$this->image->thumbnailImage( $width,false );
}
break;
case 'scale':
if($this->type=='gif')
{
$image = $this->image;
$images = $image->coalesceImages();
$canvas = new Imagick();
foreach($images as $frame){
$img = new Imagick();
$img->readImageBlob($frame);
$img->thumbnailImage( $width,true );
$canvas->addImage( $img );
$canvas->setImageDelay( $img->getImageDelay() );
}
$image->destroy();
$this->image = $canvas;
}
else
{
$this->image->thumbnailImage( $width,true );
}
break;
case 'scale_fill':
$size = $this->image->getImagePage();
$src_width = $size['width'];
$src_height = $size['height'];

$x = 0;
$y = 0;

$dst_width = $width;
$dst_height = $height;
if($src_width$height > $src_height$width)
{
$dst_height = intval($width$src_height/$src_width);
$y = intval( ($height-$dst_height)/2 );
}
else
{
$dst_width = intval($height$src_width/$src_height);
$x = intval( ($width-$dst_width)/2 );
}
$image = $this->image;
$canvas = new Imagick();

$color = 'rgba('.$fill_color[0].','.$fill_color[1].','.$fill_color[2].','.$fill_color[3].')';
if($this->type=='gif')
{
$images = $image->coalesceImages();
foreach($images as $frame)
{
$frame->thumbnailImage( $width,true );
$draw = new ImagickDraw();
$draw->composite($frame->getImageCompose(),$y,$dst_width,$dst_height,$frame);
$img = new Imagick();
$img->newImage($width,$color,'gif');
$img->drawImage($draw);
$canvas->addImage( $img );
$canvas->setImageDelay( $img->getImageDelay() );
$canvas->setImagePage($width,0);
}
}
else
{
$image->thumbnailImage( $width,true );

$draw = new ImagickDraw();
$draw->composite($image->getImageCompose(),$image);

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