如何在缩放纸张时在jointjs上翻译动态添加的SVG动画

var graph = new joint.dia.Graph();
var paper = new joint.dia.Paper({
    el: document.getElementById('paper'),
    model: graph,
    width: 800,
    height: 600,
    gridSize: 10
});

var svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
paper.el.appendChild(svg);

var rect = document.createElementNS('http://www.w3.org/2000/svg', 'rect');
rect.setAttribute('x', 50);
rect.setAttribute('y', 50);
rect.setAttribute('width', 100);
rect.setAttribute('height', 100);
rect.setAttribute('fill', 'blue');
svg.appendChild(rect);

var draw = SVG(svg);

var rect = draw.rect(100, 100).fill('blue');
rect.animate(1000).scale(2);