设置后，Imagick无法反映重力 [英] Imagick not reflects the gravity once it is set

问题描述

我正在尝试翻译下面的Imagemagick命令行代码

I am trying to translate the following piece of Imagemagick command line code

 convert tmpI.mpc -gravity center -crop ${ww}x${hc}+0+0 +repage

如下

$tmpIC->setGravity(imagick::GRAVITY_CENTER);
$tmpIC->cropImage($ww, $hc, 0, 0);
$tmpIC->setImagePage($tmpIC->getImageWidth(), $tmpIC->getImageHeight(), 0, 0);

但是设置或不设置重力没有区别.请告诉我我的这段代码有什么问题

but setting or not setting the gravity makes no difference. Please tell me what is wrong with the piece of code I have

裁剪前图像的宽度和高度为

Width and Height of the image before cropping are

tmpIC->getImageWidth() = 479
tmpIC->getImageHeight() = 599

ww和hc的值是

ww=479
hc=479

以及裁剪后图像的宽度和高度如下

and the width and height of the image after cropping are as follows

tmpIC->getImageWidth() = 479
tmpIC->getImageHeight() = 479

推荐答案

在Imagick中，并非所有ImageMagick命令都可以直接转换为相同的命名命令.

Not all of the ImageMagick commands can be converted directly to the same named commands in Imagick.

在您的情况下，引力命令的映射效果不是很好-但是您可以通过一个单独的cropImage函数调用来完成将图像裁剪到中心的相同效果:

In your case, the gravity command doesn't map very well - but the same effect of cropping the image to the centre can be done by yourself in a single cropImage function call:

$tmpIC->cropImage(
    $ww,
    $hc,
    $startX = ($tmpIC->getImageWidth() - $ww) / 2,
    $startY = ($tmpIC->getImageHeight() - $hc) / 2
);

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