isPointInsideCircle function
Implementation
bool isPointInsideCircle(Offset point, Offset center, double rradius) {
var radius = rradius * 1.2;
return point.dx < (center.dx + radius) &&
point.dx > (center.dx - radius) &&
point.dy < (center.dy + radius) &&
point.dy > (center.dy - radius);
}