PHP - 在参考点上旋转图像

问题描述：

我想知道是否可以使用参考点旋转图像.

I am wondering if it is possible to rotate an image using a reference point.

例如，将此图像旋转 30 度:

For example, rotating this image by 30 degrees:

而不是:

我想要:

表示在左下角旋转图像.

which means rotating the image on the bottom-left point.

如果需要，我会将矩形重叠到原始图像上，然后根据需要旋转它.

I would do this overlapping the rectangle to the original image if needed, and rotating it as needed only after.

答

ImageMagick 扩展可以做到这一点，使用 DISTORTION_SCALEROTATETRANSLATE 选项.您可能需要稍微调整坐标和角度以满足您的需要.

The ImageMagick extension can do this, using the DISTORTION_SCALEROTATETRANSLATE option. You might need to tweak the coordinates and angle a bit to fit your needs.

<?php
$im = new Imagick('sample.png'); 

$args = array( 
    0, // X-point
    300, // Y-point
    1,   // Scale
    -45, // Rotation
); 

$im->distortImage(Imagick::DISTORTION_SCALEROTATETRANSLATE, $args, false);

$im->setImageFormat('png');
file_put_contents('rotated.png', (string) $im);

PHP - 在参考点上旋转图像

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