PHP / GD – 裁剪和调整图像大小
发布时间：2020-12-13 18:00:36 所属栏目：PHP教程 来源：网络整理
导读：我编写了一个函数,将图像裁剪为给定的宽高比,最后调整大小并将其输出为JPG： ?phpfunction Image($image,$crop = null,$size = null){ $image = ImageCreateFromString(file_get_contents($image)); if (is_resource($image) === true) { $x = 0; $y = 0; $w
|
我编写了一个函数,将图像裁剪为给定的宽高比,最后调整大小并将其输出为JPG：
<?php
function Image($image,$crop = null,$size = null)
{
$image = ImageCreateFromString(file_get_contents($image));
if (is_resource($image) === true)
{
$x = 0;
$y = 0;
$width = imagesx($image);
$height = imagesy($image);
/*
CROP (Aspect Ratio) Section
*/
if (is_null($crop) === true)
{
$crop = array($width,$height);
}
else
{
$crop = array_filter(explode(':',$crop));
if (empty($crop) === true)
{
$crop = array($width,$height);
}
else
{
if ((empty($crop[0]) === true) || (is_numeric($crop[0]) === false))
{
$crop[0] = $crop[1];
}
else if ((empty($crop[1]) === true) || (is_numeric($crop[1]) === false))
{
$crop[1] = $crop[0];
}
}
$ratio = array
(
0 => $width / $height,1 => $crop[0] / $crop[1],);
if ($ratio[0] > $ratio[1])
{
$width = $height * $ratio[1];
$x = (imagesx($image) - $width) / 2;
}
else if ($ratio[0] < $ratio[1])
{
$height = $width / $ratio[1];
$y = (imagesy($image) - $height) / 2;
}
/*
How can I skip (join) this operation
with the one in the Resize Section?
*/
$result = ImageCreateTrueColor($width,$height);
if (is_resource($result) === true)
{
ImageSaveAlpha($result,true);
ImageAlphaBlending($result,false);
ImageFill($result,ImageColorAllocateAlpha($result,255,127));
ImageCopyResampled($result,$image,$x,$y,$width,$height,$height);
$image = $result;
}
}
/*
Resize Section
*/
if (is_null($size) === true)
{
$size = array(imagesx($image),imagesy($image));
}
else
{
$size = array_filter(explode('x',$size));
if (empty($size) === true)
{
$size = array(imagesx($image),imagesy($image));
}
else
{
if ((empty($size[0]) === true) || (is_numeric($size[0]) === false))
{
$size[0] = round($size[1] * imagesx($image) / imagesy($image));
}
else if ((empty($size[1]) === true) || (is_numeric($size[1]) === false))
{
$size[1] = round($size[0] * imagesy($image) / imagesx($image));
}
}
}
$result = ImageCreateTrueColor($size[0],$size[1]);
if (is_resource($result) === true)
{
ImageSaveAlpha($result,true);
ImageAlphaBlending($result,true);
ImageFill($result,ImageColorAllocate($result,255));
ImageCopyResampled($result,$size[0],$size[1],imagesx($image),imagesy($image));
header('Content-Type: image/jpeg');
ImageInterlace($result,true);
ImageJPEG($result,null,90);
}
}
return false;
}
?>
该功能按预期工作,但我正在创建一个非必需的GD图像资源,我该如何解决它？我试过加入两个电话,但我必须做一些错误的计算. <?php
/*
Usage Examples
*/
Image('http://upload.wikimedia.org/wikipedia/commons/4/47/PNG_transparency_demonstration_1.png','1:1','600x');
Image('http://upload.wikimedia.org/wikipedia/commons/4/47/PNG_transparency_demonstration_1.png','2:1','2:','250x300');
?>
非常感谢任何帮助,谢谢.
您必须修改调整大小代码,而不是基于要开始的裁剪图像.由于您希望一次性进行裁剪和调整大小,因此您需要单独计算它.
<?php
function Image($image,$crop = ':',$size = null) {
$image = ImageCreateFromString(file_get_contents($image));
if (is_resource($image)) {
$x = 0;
$y = 0;
$width = imagesx($image);
$height = imagesy($image);
// CROP (Aspect Ratio) Section
$crop = array_filter(explode(':',$crop));
if (empty($crop)) {
$crop = [$width,$height];
} else {
$crop[0] = $crop[0] ?: $crop[1];
$crop[1] = $crop[1] ?: $crop[0];
}
$ratio = [$width / $height,$crop[0] / $crop[1]];
if ($ratio[0] > $ratio[1]) {
$width = $height * $ratio[1];
$x = (imagesx($image) - $width) / 2;
} else {
$height = $width / $ratio[1];
$y = (imagesy($image) - $height) / 2;
}
// Resize Section
if (is_null($size)) {
$size = [$width,$height];
} else {
$size = array_filter(explode('x',$size));
if (empty($size)) {
$size = [imagesx($image),imagesy($image)];
} else {
$size[0] = $size[0] ?: round($size[1] * $width / $height);
$size[1] = $size[1] ?: round($size[0] * $height / $width);
}
}
$result = ImageCreateTrueColor($size[0],$size[1]);
if (is_resource($result)) {
ImageSaveAlpha($result,$height);
ImageInterlace($result,90);
}
}
return false;
}
header('Content-Type: image/jpeg');
Image('http://upload.wikimedia.org/wikipedia/commons/4/47/PNG_transparency_demonstration_1.png','600x');
?>
（编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |