设置PDF的默认缩放级别

Question

我想使用jsPDF设置PDF中显示的图像的默认缩放级别。 我试图将其设置为75％或“实际大小”。 但它没有得到确定。

我还使用了resizeImg()但是没有设置缩放级别。

这是HTML：

<span class="col-sm-3 padding0">
    <button id="downloadModel" class="btn btn-md btn-default"
            style="height:100px;width: 210px" 
            ng-click="downloadWorkModel()">
          Download Work Model
    </button>
</span>

CODE：

$scope.downloadWorkModel= function(){
 var image = new Image();
            var width, height;
            image.onload = function() {
                width= this.width;
                height= this.height;
                width = width*4;
                document.body.appendChild(this);
                image = resizeImg(this, width, height);
                console.log("image width: " + width);
                console.log("image height: " +height);
                var pdf = new jsPDF("l", "mm", [image.width, image.height]);
                pdf.addImage(this, 'png', 0, 0);
                pdf.save('workModel.pdf');
};


 function resizeImg (image, origW, origH)
    {
      var resize = 100; // resize amount in percentage
      //var mouseX = event.x;
      //var mouseY = event.y;
      var newH   = origH * (resize / 100);
      var newW   = origW * (resize / 100);

      // Set the new width and height
      image.style.height = newH;
      image.style.width  = newW;

      var c = image.parentNode;

      // Work out the new center
      c.scrollLeft = ((resize / 100)) - (newW / 2) / 2;
      c.scrollTop  = ((resize / 100)) - (newH / 2) / 2;
      return image;
    }

PDF格式的默认图像视图