[英]php - imagecopyresampled
我正在尝试使用jcrop
允许用户创建其图像的缩略图,它将为190x190 pixels
。
jcrop
似乎正在工作,并向我发送了正确的坐标。 但是, imagecopyresampled
似乎表现得非常不可预测,并且无法满足我的期望。 这是我的代码:
$destWidth = $destHeight = 190;
$jpeg_quality = 90;
$path = Yii::app()->basePath."/../images/user/";
$src = $path.$model->image;
$img_src = imagecreatefromjpeg($src);
$img_dest = ImageCreateTrueColor( $destWidth, $destHeight );
imagecopyresampled(
$img_dest, //destination image
$img_src, //source image
0, //top left coordinate of the destination image in x direction
0, //top left coordinate of the destination image in y direction
$_POST['x'], //top left coordinate in x direction of source image that I want copying to start at
$_POST['y'], //top left coordinate in y direction of source image that I want copying to start at
$destWidth, //190, thumbnail width
$destHeight, //190, thumbnail height
$_POST['w'], //how wide the rectangle from the source image we want thumbnailed is
$_POST['h'] //how high the rectangle from the source image we want thumbnailed is
);
imagejpeg($img_dest,$path."thumbs/test.jpg",$jpeg_quality);
我很不知所措,我检查了四个$_POST
变量都正确输入了,但是由于某种原因,我无法获得正确的缩略图。 我可以肯定地说的是,缩略图通常放大得太多,并且我想从其开始的左上角没有被使用。
这是我的最终源代码。 我发现我的CSS与我的代码冲突,因为它允许的最大高度为550px,最大宽度为700px。 这会导致较大的图像具有错误的宽度和/或高度。 因此,在这些情况下,我必须根据图像的纵横比以及CSS如何调整其大小来添加一个乘数。
$destWidth = $destHeight = 190;
$jpeg_quality = 90;
$path = Yii::app()->basePath."/../images/user/";
$src = $path.$model->image;
$img_src = imagecreatefromjpeg($src);
$img_dest = ImageCreateTrueColor( $destWidth, $destHeight );
//
// IMPORTANT!!
// If you change the max-width or max-height in the css, you MUST change them here too!!
//
$maxWidth = 700;
$maxHeight = 550;
$srcWidth = imagesx($img_src);
$srcHeight = imagesy($img_src);
$srcRatio = $srcWidth/$srcHeight;
$mult = 1;
//if the image is wider than the max allowed width AND has a wider aspect ratio than a max height + max width image
if ($srcWidth > $maxWidth && $srcRatio > $maxWidth/$maxHeight) {
$mult = $srcWidth/$maxWidth;
//else if the image is taller than the max height
} else if ($srcHeight > $maxHeight) {
$mult = $srcHeight/$maxHeight;
}
imagecopyresampled(
$img_dest, //destination image
$img_src, //source image
0, //top left coordinate of the destination image in x direction
0, //top left coordinate of the destination image in y direction
$_POST['x']*$mult, //top left coordinate in x direction of source image that I want copying to start at
$_POST['y']*$mult, //top left coordinate in y direction of source image that I want copying to start at
$destWidth, //190, thumbnail width
$destHeight, //190, thumbnail height
$_POST['w']*$mult, //how wide the rectangle from the source image we want thumbnailed is
$_POST['h']*$mult //how high the rectangle from the source image we want thumbnailed is
);
imagejpeg($img_dest,$path."thumbs/$model->image",$jpeg_quality);
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