generatePoints method
Implementation
@override
void generatePoints() {
var innerArc = Arc(
startAngle: startAngle,
angle: angle,
radius: innerRadius,
arcCenter: arcCenter,
);
var outerArc = Arc(
startAngle: startAngle,
angle: angle,
radius: outerRadius,
arcCenter: arcCenter,
);
outerArc.reversePoints();
appendPoints(innerArc.points);
addLineTo(outerArc.points.first);
appendPoints(outerArc.points);
addLineTo(innerArc.points.first);
}