Imagick
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Imagick::distortImage

(PECL imagick 2.0.1)

Imagick::distortImage — Distorts an image using various distortion methods

说明

bool Imagick::distortImage ( int $method , array $arguments , bool $bestfit )

Distorts an image using various distortion methods, by mapping color lookups of the source image to a new destination image usually of the same size as the source image, unless 'bestfit' is set to TRUE.

If 'bestfit' is enabled, and distortion allows it, the destination image is adjusted to ensure the whole source 'image' will just fit within the final destination image, which will be sized and offset accordingly. Also in many cases the virtual offset of the source image will be taken into account in the mapping.

此方法在Imagick基于ImageMagick 6.3.6以上版本编译时可用。

参数

method

The method of image distortion. See distortion constants

arguments

The arguments for this distortion method

bestfit

Attempt to resize destination to fit distorted source

返回值

成功时返回 TRUE。

错误／异常

错误时抛出 ImagickException。

范例

Example #1 Using Imagick::distortImage():

Distort an image and display to the browser.

<?php
/* Create new object */
$im = new Imagick();

/* Create new checkerboard pattern */
$im->newPseudoImage(100, 100, "pattern:checkerboard");

/* Set the image format to png */
$im->setImageFormat('png');

/* Fill new visible areas with transparent */
$im->setImageVirtualPixelMethod(Imagick::VIRTUALPIXELMETHOD_TRANSPARENT);

/* Activate matte */
$im->setImageMatte(true);

/* Control points for the distortion */
$controlPoints = array( 10, 10, 
                        10, 5,

                        10, $im->getImageHeight() - 20,
                        10, $im->getImageHeight() - 5,

                        $im->getImageWidth() - 10, 10,
                        $im->getImageWidth() - 10, 20,

                        $im->getImageWidth() - 10, $im->getImageHeight() - 10,
                        $im->getImageWidth() - 10, $im->getImageHeight() - 30);

/* Perform the distortion */                       
$im->distortImage(Imagick::DISTORTION_PERSPECTIVE, $controlPoints, true);

/* Ouput the image */
header("Content-Type: image/png");
echo $im;
?>

以上例程的输出类似于：

Output of example : Using Imagick::distortImage()

参见

Imagick
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用户评论:

DJ Mike (2011-04-11 23:11:07)

Affine

<?php 
$image = new imagick( "opossum.jpg" ); 
$points = array( 
                0,0, 25,25,   
               100,0, 100,50 
               );
$image->setimagebackgroundcolor("#fad888");
$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );
$image->distortImage(  Imagick::DISTORTION_AFFINE, $points, TRUE ); 
header( "Content-Type: image/jpeg" ); 
echo $image;
?>

Affine Projection

<?php 
$image = new imagick( "opossum.jpg" ); 
$points = array( 0.9,0.3,
                -0.2,0.7,
                 20,15 );
$image->setimagebackgroundcolor("#fad888");
$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );
$image->distortImage( Imagick::DISTORTION_AFFINEPROJECTION, $points, TRUE ); 
header( "Content-Type: image/jpeg" ); 
echo $image;
?>

Arc

<?php 
$image = new imagick( "opossum.jpg" ); 
$draw = new imagickdraw(); 
$degrees = array( 180 );
$image->setimagebackgroundcolor("#fad888");
$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );
$image->distortImage( Imagick::DISTORTION_ARC, $degrees, TRUE ); 
header( "Content-Type: image/jpeg" ); 
echo $image;
?>

Rotated Arc

<?php 
$image = new imagick( "opossum.jpg" ); 
$draw = new imagickdraw(); 
$degrees = array( 180, 45, 100, 20 );
$image->setimagebackgroundcolor("#fad888");
$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );
$image->distortImage( Imagick::DISTORTION_ARC, $degrees, TRUE ); 
header( "Content-Type: image/jpeg" ); 
echo $image;
?>

Bilinear

<?php 
$image = new imagick( "opossum.jpg" ); 
$points = array( 
                0,0, 25,25, # top left  
                176,0, 126,0, # top right
                0,135, 0,105, # bottom right 
                176,135, 176,135 # bottum left
                );
$image->setimagebackgroundcolor("#fad888");
$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );
$image->distortImage( Imagick::DISTORTION_BILINEAR, $points, TRUE ); 
header( "Content-Type: image/jpeg" ); 
echo $image;
?>

Perspective

<?php 
$image = new imagick( "opossum.jpg" ); 
$points = array( 
                0,0, 25,25, # top left  
                176,0, 126,0, # top right
                0,135, 0,105, # bottom right 
                176,135, 176,135 # bottum left
                );
$image->setimagebackgroundcolor("#fad888");
$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );
$image->distortImage( Imagick::DISTORTION_PERSPECTIVE, $points, TRUE ); 
header( "Content-Type: image/jpeg" ); 
echo $image;
?>

Scale Rotate Translate

<?php 
$image = new imagick( "opossum.jpg" ); 
$points = array( 
                 1.5, # scale 150%
                 150 # rotate
               );
$image->setimagebackgroundcolor("#fad888");
$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );
$image->distortImage( imagick::DISTORTION_SCALEROTATETRANSLATE, $points, TRUE ); 
header( "Content-Type: image/jpeg" ); 
echo $image;
?>

ashokmca.g at gmail dot com (2011-02-04 02:13:33)

Slide image with shadow using distortImage

<?php

$slideValue = 150;

// Create new object 
$im = new Imagick("grnhrs.jpg");

// Resize 
$im->thumbnailImage(500,400);

// Set the image format to png 
$im->setImageFormat('png');

//Clone the current object
$shadow = $im->clone();

//Set image background color to black (this is the color of the shadow)
$shadow->setImageBackgroundColor( new ImagickPixel( 'black' ) );
 
 //Create the shadow 
$shadow->shadowImage( 80, 10, 5, 5 );

// Fill background area with transparent for image
//VIRTUALPIXELMETHOD_TRANSPARENT
$im->setImageVirtualPixelMethod(Imagick::VIRTUALPIXELMETHOD_ TRANSPARENT);

// Activate matte 
$im->setImageMatte(true);

//Control points for the distortion 
$controlPoints = array( 0, 0,
                        $slideValue, 0,
                        
                        0, $im->getImageHeight(),
                        0, $im->getImageHeight(),
                        
                        $im->getImageWidth(), 0,
                        $im->getImageWidth(), 0,
                        
                        $im->getImageWidth(), $im->getImageHeight(),
                        $im->getImageWidth()-$slideValue, $im->getImageHeight());
                        
// Perform the distortion 
$im->distortImage(Imagick::DISTORTION_PERSPECTIVEPROJECTION, $controlPoints, true);

// Perform the distortion in shadow image
$shadow->distortImage(Imagick::DISTORTION_PERSPECTIVEPROJECTION, $controlPoints, true);

// Imagick::shadowImage only creates the shadow.
// That is why the original image is composited over it 
$shadow->compositeImage( $im, Imagick::COMPOSITE_OVER, 0, 0 );

/* Ouput the image */
header("Content-Type: image/png");
echo $shadow;

?>

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