var chart = new d3Kit.SvgChart('#chart', {  
  initialWidth: 720,
  initialHeight: 500,
  margin: { top: 30, right: 30, bottom: 30, left: 30 },
  offset: { x: 0.5, y: 0.5 } // add little offset for sharp-edge rendering
});

chart.rootG.append('circle')
  .attr('cx', 40)
  .attr('cy', 40)
  .attr('r', 30)