g9 { radius: 100 angle: 0 },(data, ctx)-> sides = 10 for i in [0 .. sides] a = data.angle + i/sides * Math.PI * 2 r1 = data.radius r2 = r1/2 ctx.point r1 * (Math.cos a), r1 * (Math.sin a) ctx.point r2 * (Math.cos -a), r2 * (Math.sin -a),fill: 'red'