那些遇到过的问题

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

AZi*_*key 27 php math imagemagick rotation imagick

我使用FabricJs在Canvas上创建了一些带有一些图片和文本的设计(270x470)然后我通过fabricJS的canvas.toJSON()方法以JSON格式导出所有图片/文本信息现在我需要以高质量重新绘制该设计( 2790x4560)使用Imagick在PHP中的图像.

FabricJS设计

上面设计的JSON dataArray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"
}}
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这里是我的代码片段,用于使用JSON dataArray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();
 }
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添加图片();

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();
    }
}
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我的输出结果(90%)是有上述解决方案,但我们可以看到一些图像(蓝色数字线)没有放置在看起来像第一个设计图像的确切位置

Imagick设计

基本上我要做的是,"在循环中调用addImage方法进行缩放 - 旋转 - 在打印图像上定位每个图像(300DPi)

我不知道我错过了什么,以获得精确的偏移(新的x,y坐标/位置/左上)在Imagick中旋转后的图像,或者我在缩放后旋转对象然后撰写

或者可能是像Math.PI这样的数学公式:)

问题是: 如何根据旋转度/刻度后的角度计算新的偏移/位置？

我希望发布的代码段对每个人都有用.

Dan*_*ack 9

这不是一个完整的答案,但你完全错了.

Fabric.js已经有了一种使用canvas.toSVG()函数将画布保存为SVG格式的方法.Imagick可以打开SVG文件,并以任何你想要的质量将它们转换为PNG.

尝试包含图像中包含的位图时会出现问题,例如

"src": "http:\\example.com/images/3f0bc771261860d917e0ad6d09cb2064.png",
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我强烈建议您自己在服务器上下载,而不是让Imagick下载它们.这不仅可以让您更好地控制可能发生的任何错误,还可以限制一些安全风险.允许人们从您的服务器中下载任意数据,然后让具有许多内存访问错误的库使用该数据不是一个好主意.

执行此操作的一般方法是在fabric.js创建SVG之前使用对本地文件名的引用替换图像的src,或者在转换后更加笨拙地执行此操作 - 并且当您执行此替换时生成需要从远程服务器下载的文件列表.

实际的实现细节留作OP的练习.

顺便说一句,有人已经做过这样的合理机会....你有没有彻底搜查过packagist/github？

  • 您应该将其作为单独的问题发布在"为什么Imagick不会转换Fabric生成的SVG"下. (3认同)

AZi*_*key 0

在这里我得到了一个解决方案，也许它会帮助像我一样的其他人

<?php

// AZinkey
ini_set('memory_limit', '1024M'); // may be need increase memory size
ini_set('display_errors', 1); // enable error display
error_reporting(E_ALL); // show all type errors

$id = $_GET['id'];
$file = $id . ".json"; // json file e.g. 1234.json
$printData = json_decode(file_get_contents($file));

$mask = "mask.png"; // a image (4395x4395) which contains 2669x4395 black fill in center
$maskImg = new Imagick($mask);
$d = $maskImg->getImageGeometry();

$maskWidth = $d['width'];
$maskHeight = $d['height'];

// Then reduce any list of integer
$cd = array_reduce(array($maskWidth, 400), 'gcd');
$r1 = $maskWidth / $cd;
$r2 = 400 / $cd;

$newPrintData['r1'] = $r1;
$newPrintData['r2'] = $r2;


try {
    $print = new Imagick();
    $print->setResolution(300, 300);
    $background = (empty($printData->json_data->background)) ? 'transparent' : $printData->json_data->background;
    $print->newImage($maskWidth, $maskHeight, new ImagickPixel($background));

    $print->setImageMatte(TRUE);
    $print->setImageFormat('png32');
    $print->setImageUnits(imagick::RESOLUTION_PIXELSPERCENTIMETER);
} catch (Exception $e) {
    echo $e->getMessage();
}

// create two array for store text & images information separately 
$imageObjects = $textObjects = [];

foreach ($printData->json_data->objects as $object) {
    if ($object->type == 'image') {
        $imageObjects[] = $object;
    } else if ($object->type == 'text') {
        $imageObjects[] = $object;
    }
}
foreach ($imageObjects as $object) {
    addImageToLarge($object, $print, $printData, $newPrintData);
}

foreach ($imageObjects as $object) {
    addTextToLarge($object, $print, $printData, $newPrintData);
}
try {
    $print->setImageFormat('png');
    $saveFile = $id . "_print.json"; // save large image _print.png
    file_put_contents($saveFile, $print);
} catch (Exception $e) {
    echo $e->getMessage();
    exit();
}

function addImageToLarge($object, $print, $printData, $newPrintData) {
    try {
        $src = new Imagick($object->src);
        $size = $src->getImageGeometry();
        $resizeWidth = changeDpi(scale($object->width, $newPrintData['r1'], $newPrintData['r2']) * $object->scaleX);
        $resizeHeight = changeDpi(scale($object->height, $newPrintData['r1'], $newPrintData['r2']) * $object->scaleY);

        $src->resizeImage($resizeWidth, $resizeHeight, Imagick::FILTER_LANCZOS, 1);
        $sizeAfterResize = $src->getImageGeometry();

        $src->rotateImage(new ImagickPixel('none'), $object->angle);
        $sizeAfterRotate = $src->getImageGeometry();

        $left = $object->left < 0 ? -1 * abs(changeDpi(scale($object->left, $newPrintData['r1'], $newPrintData['r2']))) : changeDpi(scale($object->left, $newPrintData['r1'], $newPrintData['r2']));
        $top = $object->top < 0 ? -1 * abs(changeDpi(scale($object->top, $newPrintData['r1'], $newPrintData['r2']))) : changeDpi(scale($object->top, $newPrintData['r1'], $newPrintData['r2']));

        $print->compositeImage($src, Imagick::COMPOSITE_OVER, $left, $top);
    } catch (Exception $e) {
        echo $e->getMessage();
        exit();
    }
}

function addTextToLarge($object, $print, $printData, $newPrintData) {
    $fnt['Times New Roman'] = "font/times_6.ttf";
    $fnt['Arial'] = "font/arial_8.ttf";
    $fnt['Arial Black'] = "font/ariblk_8.ttf";
    $fnt['Comic Sans MS'] = "font/comic_5.ttf";
    $fnt['Courier New'] = "font/cour_5.ttf";
    $fnt['Georgia'] = "font/georgia_5.ttf";
    $fnt['Impact'] = "font/impact_7.ttf";
    $fnt['Lucida Console'] = "font/lucon_3.ttf";
    $fnt['Lucida Sans Unicode'] = "font/l_4.ttf";
    $fnt['Palatino Linotype'] = "font/pala_7.ttf";
    $fnt['Tahoma'] = "font/tahoma_3.ttf";
    $fnt['Trebuchet MS'] = "font/trebuc_3.ttf";
    $fnt['Verdana'] = "font/verdana_5.ttf";

    try {
        $line_height_ratio = $object->lineHeight;
        $resizeWidth = changeDpi(scale($object->width, $newPrintData['r1'], $newPrintData['r2']) * $object->scaleX);
        $resizeHeight = changeDpi(scale($object->height, $newPrintData['r1'], $newPrintData['r2']) * $object->scaleY);

        $print2 = new Imagick();
        $print2->setResolution(300, 300);
        $print2->newImage($resizeWidth, $resizeHeight, "transparent");
        $print2->setImageVirtualPixelMethod(imagick::VIRTUALPIXELMETHOD_BACKGROUND);
        $print2->setImageFormat('png32');
        $print2->setImageUnits(imagick::RESOLUTION_PIXELSPERCENTIMETER);

        // Instantiate Imagick utility objects
        $draw = new ImagickDraw();
        $color = new ImagickPixel($object->fill);

        //$starting_font_size = 100*1.33;
        $font_size = (($object->fontSize * $resizeWidth) / $object->width);

        $draw->setFontWeight(($object->fontWeight == 'bold') ? 600 : 100 );
        $draw->setFontStyle(0);
        $draw->setFillColor($color);

        // Load Font 
        //$font_size = $starting_font_size;
        $draw->setFont($fnt[$object->fontFamily]);
        $draw->setFontSize($font_size);

        $draw->setTextAntialias(true);
        $draw->setGravity(Imagick::GRAVITY_CENTER);

        if ($object->stroke) {
            $draw->setStrokeColor($object->stroke);
            $draw->setStrokeWidth($object->strokeWidth);
            $draw->setStrokeAntialias(true);  //try with and without
        }

        $total_height = 0;

        // Run until we find a font size that doesn't exceed $max_height in pixels
        while (0 == $total_height || $total_height > $resizeHeight) {
            if ($total_height > 0) {
                $font_size--; // we're still over height, decrement font size and try again
            }
            $draw->setFontSize($font_size);

            // Calculate number of lines / line height
            // Props users Sarke / BMiner: http://stackoverflow.com/questions/5746537/how-can-i-wrap-text-using-imagick-in-php-so-that-it-is-drawn-as-multiline-text
            $words = preg_split('%\s%', $object->text, -1, PREG_SPLIT_NO_EMPTY);
            $lines = array();
            $i = 0;
            $line_height = 0;

            while (count($words) > 0) {
                $metrics = $print2->queryFontMetrics($draw, implode(' ', array_slice($words, 0, ++$i)));
                $line_height = max($metrics['textHeight'], $line_height);

                if ($metrics['textWidth'] > $resizeWidth || count($words) < $i) {
                    $lines[] = implode(' ', array_slice($words, 0, --$i));
                    $words = array_slice($words, $i);
                    $i = 0;
                }
            }

            $total_height = count($lines) * $line_height * $line_height_ratio;

            if ($total_height > 0) {

            }
        }
        // Writes text to image
        $x_pos = 0;
        $y_pos = 0;

        for ($i = 0; $i < count($lines); $i++) {
            $print2->annotateImage($draw, $x_pos, $y_pos + ($i * $line_height * $line_height_ratio), $object->angle, $lines[$i]);
        }

        if ($object->flipX == 1)
            $print2->flopImage(); // x
        if ($object->flipY == 1)
            $print2->flipImage(); // y

        $print2->trimImage(0);
        $print2->setImagePage(0, 0, 0, 0);

        $print2->resizeImage($resizeWidth, 0, Imagick::FILTER_CATROM, 0.9, false);

        $left = $object->left < 0 ? -1 * abs(changeDpi(scale($object->left, $newPrintData['r1'], $newPrintData['r2']))) : changeDpi(scale($object->left, $newPrintData['r1'], $newPrintData['r2']));
        $top = $object->top < 0 ? -1 * abs(changeDpi(scale($object->top, $newPrintData['r1'], $newPrintData['r2']))) : changeDpi(scale($object->top, $newPrintData['r1'], $newPrintData['r2']));

        $print->compositeImage($print2, Imagick::COMPOSITE_OVER, $left, $top);

        //header("Content-Type: image/png");
        //echo $print2;exit;
    } catch (Exception $e) {
        echo $e->getMessage();
        exit();
    }
}

//The greatest common divisor (GCD) 
function gcd($a, $b) {
    return $b ? gcd($b, $a % $b) : $a;
}

function changeDpi($px) {
    //return ($px/96)*300;
    return $px;
}

function scale($px, $r1, $r2) {
    return $px * $r1 / $r2;
}
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