Question

我正在使用Fabric.js在画布上工作。完成后，我将其扩展到上传所需的大小，因为画布的工作区必须适合屏幕，我的实际上传文件需要大约。宽14,000像素，高8,750像素。如果我创建一个图像，它会在几秒钟内创建它而不会出现问题。当我尝试使用jsPDF创建PDF时，它会崩溃。

这适用于从Fabric.js画布创建图像：

class Person < ActiveRecord::Base
  scope :closest, ->(point) {
    return nil unless point # How can I return the ActiveSupport::Relation here?
    # other code goes below
  }
end

这无法创建PDF /崩溃浏览器：

var dataURL = canvas.toDataURL({
                format: 'png',
                multiplier: 20                
            })

 document.write('<img src="' + dataURL + '"/>');

Answer 1

鉴于您的图像尺寸，这在客户端完成的任务太简单了正如上面的解决方案试图指出的那样，无论您使用何种技术，都需要在服务器端进行此操作。

Answer 2

JQuery Code:
First you get active object of canvas the go throw
dataArray.push({
                    "objFlipX" : obj_Tshirt_canv.item(i).getFlipX(),
                    "objFlipY" : obj_Tshirt_canv.item(i).getFlipY(),
                    "objWidth" : obj_Tshirt_canv.item(i).getWidth(),
                    "bojHeight" : obj_Tshirt_canv.item(i).getHeight(),
                    "objOriginX" : obj_Tshirt_canv.item(i).getLeft(),
                    "objOriginY" : obj_Tshirt_canv.item(i).getTop(),
                    "objImgSrc" : obj_Tshirt_canv.item(i).getSrc(),
                    "objAngel" : obj_Tshirt_canv.item(i).getAngle(),
                    "objScalex" : obj_Tshirt_canv.item(i).getScaleX(),
                    "objScaley" : obj_Tshirt_canv.item(i).getScaleY(),
                    "objType" : 'image'
                });
$.ajax({
            url : " ",
            type : "POST",
            data : {
                dataArray : dataArray
            },
            cache : false,
            success : function(data) {

                alert("data update successfully");
                hideLoder();
            },
            error : function(xhr, status, error) {
                alert("Not Successfull");
            }
        });
Now crate php file and create object of fpdf like
require ('fpdf.php');
$aaa = $_REQUEST['action'];
$aaa();
function createpdf() {
    $size = Array(840, 990);
    $data = $_REQUEST['dataArray'];
    $width = 280;
    $height = 330;
    $_actualratioWid = 840 / $width;
    $_actualratioHig = 990 / $height;
    $fpdfObj = new FPDF("p", "pt", $size);
    $fpdfObj -> AddPage();
    foreach ($data as $key => $value) {
        $x = $value[objOriginX] * $_actualratioWid;
        $y = $value[objOriginY] * $_actualratioHig;
        $height = $value[bojHeight] * $_actualratioHig;
        $width = $value[objWidth] * $_actualratioHig;
        $_flipx = ($value[objFlipX]);
        $_flipy = ($value[objFlipY]);
        $imgsrc = $value[objImgSrc];
        $dataTppe = $value[objType];
        $rotation = $value[objAngel];
        $color=$value[objcol];
        $randomString = MyStringr();
        $_filename1 = $_SERVER["DOCUMENT_ROOT"] . "path" . $randomString . ".png";
        if ($value[objType] === 'text' && $value[objval] != " ") {//new code to be imp
            $image_src = $_SERVER["DOCUMENT_ROOT"] . " path". $randomString . ".png";
            exec('convert -background transparent -depth 8 -size 500 -fill "' . $color .'" -pointsize 70  label:"' . $value[objval] .'" "'. $image_src.'"');
            $fpdfObj -> Image($image_src, $x, $y);
        } else {// work done
            $imgsrc = str_replace(" path", $_SERVER["DOCUMENT_ROOT"], $imgsrc);
            if ($_flipx == "false" && $_flipy == "false") {
                $fpdfObj -> Image($imgsrc, $x, $y, $height, $width);
            } else if ($_flipy == "true" && $_flipx == "false") {
                    exec(' convert "' . $value[objImgSrc] . '" -flip  ' . $_filename1);
                    $fpdfObj -> Image($_filename1, $x, $y, $height, $width);
            }
            else if($_flipx== "true" && $_flipy=="false")
            {   exec(' convert "' . $value[objImgSrc] . '" -flop ' . $_filename1);
                $fpdfObj -> Image($_filename1, $x, $y, $height, $width);
            }
        }//end else
    }//foreach
    while (true)//generate random file name when cart is added by user in tool
    {
        $filename = uniqid('AddCart', true) . '.pdf';`enter code here`
        if (!file_exists(sys_get_temp_dir() . $filename))
            break;
    }
    $fpdfObj -> Output($_SERVER["DOCUMENT_ROOT"] . "path " . $filename);
}//end createpdf ()
function MyStringr()//return random file name
{
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $randstring = '';
    for ($i = 0; $i < 10; $i++) {
        $randstring = $characters[rand(0, strlen($characters))];
    }
    return $randstring;
}

将画布转换为PDF会导致浏览器崩溃

2 个答案: