如何使用PHP ImageMagic / Imagick从JSON /数据数组（宽度，高度，x，y，天使）创建大型（高质量300dpi）图像
2022-08-30 16:45:51
我使用FabricJs在Canvas上创建了一个设计（270x470），其中包含一些图片和文本，然后我通过fabricJS的canvas以JSON格式导出所有图片/文本信息。toJSON（）方法，现在我需要使用Imagick在PHP中的高质量（2790x4560）图像上重新绘制该设计。
JSON data上述设计数组，其中包含所有对象的信息，如大小，位置，角度等。
{
"width": "2790",
"height": "4560",
"json_data": {
"objects": [{
"type": "image",
"originX": "left",
"originY": "top",
"left": "5",
"top": "105",
"width": "260",
"height": "260",
"scaleX": "1",
"scaleY": "1",
"angle": "0",
"opacity": "1",
"src": "http:\\example.com/images/098f20be9fb7b66d00cb573acc771e99.JPG",
}, {
"type": "image",
"originX": "left",
"originY": "top",
"left": "5",
"top": "229.5",
"width": "260",
"height": "11",
"scaleX": "1",
"scaleY": "1",
"angle": "0",
"opacity": "1",
"src": "http:\\example.com/images/aeced466089d875a7c0dc2467d179e58.png",
}, {
"type": "image",
"originX": "left",
"originY": "top",
"left": "51.07",
"top": "135.58",
"width": "260",
"height": "11",
"scaleX": "1",
"scaleY": "1",
"angle": "47.41",
"opacity": "1",
"src": "http:\\example.com/images/910ce024d984b6419d708354bf3641a3.png",
}, {
"type": "image",
"originX": "left",
"originY": "top",
"left": "139.71",
"top": "104.97",
"width": "260",
"height": "11",
"scaleX": "1",
"scaleY": "1",
"angle": "89.65",
"opacity": "1",
"src": "http:\\example.com/images/88e096a82e5f8a503a71233addaff64c.png",
}, {
"type": "image",
"originX": "left",
"originY": "top",
"left": "230.78",
"top": "146.93",
"width": "260",
"height": "11",
"scaleX": "1",
"scaleY": "1",
"angle": "134.98",
"src": "http:\\example.com/images/d2c0ec738c1fec827381cfeb600bd87d.png",
}, {
"type": "image",
"originX": "left",
"originY": "top",
"left": "265.01",
"top": "240.19",
"width": "260",
"height": "11",
"scaleX": "1",
"scaleY": "1",
"angle": "179.86",
"opacity": "1",
"src": "http:\\example.com/images/3f0bc771261860d917e0ad6d09cb2064.png",
}],
"background": "#FF00FF"
}}
在这里，我的代码片段用于使用JSON数据Array在PHP中生成高质量图像
error_reporting(E_ALL | E_STRICT);
try {
$id = $_GET['id']; // Design ID
define('DS', DIRECTORY_SEPARATOR);
$jsonDir = dirname(__FILE__) . DS . 'media' . DS . 'designs';
$printData = json_decode(file_get_contents($jsonDir . DS . $id . '.json'));
} catch (Exception $e) {
echo $e->getMessage();
}
try {
$print = new Imagick();
$print->setResolution(300, 300);
$background = (empty($printData->json_data->background)) ? 'transparent' : $printData->json_data->background;
$print->newImage($printData->width, $printData->height, new ImagickPixel($background));
$print->setImageFormat('png32');
$print->setImageUnits(imagick::RESOLUTION_PIXELSPERCENTIMETER);
} catch (Exception $e) {
echo $e->getMessage();
}
// Re-Scaling each Image/Text for Larger Canvas/Image
foreach ($printData->json_data->objects as $i => $object) {
if ($object->type == 'image') {
addImage($object, $print, $printData);
} else {
addText($object, $print, $printData);
}
}
try {
// Saving High Quality Image in (300 dpi)
$fileDir = dirname(__FILE__) . DS . 'media' . DS . 'prints';
if (!file_exists($fileDir) || !is_dir($fileDir)) {
if (!mkdir($fileDir))
die("Could not create directory: {$fileDir}\n");
}
$saved = $print->writeimage($fileDir . DS . $id . '.png');
header('Content-type: image/png');
echo $print;
} catch (Exception $e) {
echo $e->getMessage();
}
addImage（）;
function addImage($object, $print, $printData) {
try {
$widthScale = ($printData->width / 270);
$heightScale = ($printData->height / 470);
$fileDir = dirname(__FILE__) . DS . 'media' . DS . 'original' . DS;
$src = new Imagick($fileDir . basename($object->src));
$size = $src->getImageGeometry();
$resizeWidth = ($object->width * $object->scaleX) * $widthScale;
$resizeHeight = ($object->height * $object->scaleY) * $heightScale;
$src->resizeImage($resizeWidth, $resizeHeight, Imagick::FILTER_LANCZOS, 1);
$sizeAfterResize = $src->getImageGeometry();
$src->rotateImage(new ImagickPixel('none'), $object->angle);
$sizeAfterRotate = $src->getImageGeometry();
if (!$object->angle) {
$left = $object->left * $widthScale;
$top = $object->top * $heightScale;
} else {
switch ($object->angle) {
case $object->angle > 315:
$left = ($object->left * $widthScale);
$top = ($object->top * $heightScale);
break;
case $object->angle > 270:
$left = ($object->left * $widthScale);
$top = ($object->top * $heightScale);
break;
case $object->angle > 225:
$left = ($object->left * $widthScale);
$top = ($object->top * $heightScale);
break;
case $object->angle > 180:
$left = ($object->left * $widthScale);
$top = ($object->top * $heightScale);
break;
case $object->angle > 135:
$left = ($object->left * $widthScale);
$top = ($object->top * $heightScale);
break;
case $object->angle > 90:
$left = ($object->left * $heightScale) - ($sizeAfterRotate['width'] / 2);
$top = ($object->top * $heightScale) - ($sizeAfterRotate['width'] / 2);
break;
case $object->angle > 45:
$left = ($object->left * $widthScale) - $size['height'] * $widthScale;
$top = ($object->top * $heightScale) - $size['height'] * $heightScale;
break;
default:
$left = $object->left * $widthScale;
$top = $object->top * $heightScale;
break;
}
}
$print->compositeImage($src, Imagick::COMPOSITE_DEFAULT, $left, $top);
} catch (Exception $e) {
echo $e->getMessage();
}
}
我的输出结果（90%）与上述解决方案一起存在，但是正如我们所看到的，一些图像（蓝色数字线）没有放在确切的位置，这应该看起来像第一个设计图像
基本上，我试图做的是，“在循环中调用add图像方法进行缩放 - 旋转 - 将每个图像定位在打印图像（300DPi）上
我不确定我错过了什么来获得精确的偏移（新的x，y坐标/位置/左上）后旋转图像在Imagick或我正在旋转对象后缩放然后组成
或者可能是像Math.PI这样的数学公式:)
问题是：如何根据缩放后的旋转度/角度计算新的偏移/位置？
我希望发布的片段对每个人都有用。
