A critical issue in function _setDots
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samiswt commented
A variable named position in _setDots function defined a parametric formula of a circle. Left property of position should be X coordinate and top should be Y, then the parametric formula of the circle should be:
left: radius * cos(angle) + origin.x;
top: radius * sin(angle) + origin.y;
Since circle is a symmetric shape, so you will never catch the issue.