如何通过 CropperJS 获取裁剪图像的坐标？

Question

我正在使用 cropper JS 裁剪我的图像。我能够获得 canvas 的宽度和高度，但是，需要知道裁剪图像的坐标（X 和 Y）。

这是我的代码-

(function () {


  //getting ratio
  function getImageRatio(sourceCanvas) {
    var canvas = document.createElement('canvas');
    var context = canvas.getContext('2d');
    var width = sourceCanvas.width;
    var height = sourceCanvas.height;



    canvas.width = width;
    canvas.height = height;


    context.beginPath();
    context.arc(width / 2, height / 2, Math.min(width, height) / 2, 0, 2 * Math.PI);
    context.strokeStyle = 'rgba(0,0,0,0)';
    context.stroke();
    context.clip();
    context.drawImage(sourceCanvas, 0, 0, width, height);

    return canvas;
  }




  window.addEventListener('DOMContentLoaded', function () {
    var image = document.getElementById('image');
    var button = document.getElementById('button');
    var result = document.getElementById('result');
    var croppable = false;
    var cropper = new Cropper(image, {
      aspectRatio: 1,
      viewMode: 1,
      built: function () {
        croppable = true;
      }
    });

    button.onclick = function () {
      var croppedCanvas;
      var roundedCanvas;
      var roundedImage;

      if (!croppable) {
        return;
      }

      // Crop
      croppedCanvas = cropper.getCroppedCanvas();


      console.log(getImageRatio(croppedCanvas));

    };

  });

})();

任何想法，如何获得裁剪图像的坐标，以便我可以通过 PHP 裁剪该图像。

Answer 1

所以，如果我理解正确的话，你正在寻找 method getData。

它将 return 这些属性，如文档所述：

x: the offset left of the cropped area
y: the offset top of the cropped area
width: the width of the cropped area
height: the height of the cropped area
rotate: the rotated degrees of the image
scaleX: the scaling factor to apply on the abscissa of the image
scaleY: the scaling factor to apply on the ordinate of the image

虽然，我建议看一下文档的这一部分： https://github.com/fengyuanchen/cropper#getcroppedcanvasoptions

具体在这部分：

After then, you can display the canvas as an image directly, or use HTMLCanvasElement.toDataURL to get a Data URL, or use HTMLCanvasElement.toBlob to get a blob and upload it to server with FormData if the browser supports these APIs.

如果由于某些浏览器限制而无法使用 toBlob 方法（您始终可以添加 polyfill），您可以使用 toDataUrl 获取图像而不是 canvas (IE9+) .并将其发送到已经裁剪的后端服务。为此，您需要执行以下操作：

var formData = new FormData();
formData.append('image', canvas.toDataURL());

您可以在 caniuse 中查看 formData 浏览器支持

希望对您有所帮助！

如何通过 CropperJS 获取裁剪图像的坐标？

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