https://edutechnica.com/lib/vml-circle-element.js

1jvm.VMLCircleElement = function(config, style){
2  jvm.VMLCircleElement.parentClass.call(this, 'oval', config, style);
3};
4
5jvm.inherits(jvm.VMLCircleElement, jvm.VMLShapeElement);
6
7jvm.VMLCircleElement.prototype.applyAttr = function(attr, value){
8  switch (attr) {
9    case 'r':
10      this.node.style.width = value*2+'px';
11      this.node.style.height = value*2+'px';
12      this.applyAttr('cx', this.get('cx') || 0);
13      this.applyAttr('cy', this.get('cy') || 0);
14      break;
15    case 'cx':
16      if (!value) return;
17      this.node.style.left = value - (this.get('r') || 0) + 'px';
18      break;
19    case 'cy':
20      if (!value) return;
21      this.node.style.top = value - (this.get('r') || 0) + 'px';
22      break;
23    default:
24      jvm.VMLCircleElement.parentClass.prototype.applyAttr.call(this, attr, value);
25  }
26};