contain method
Implementation
bool contain(Offset localPosition) {
Path path = Path();
for (var i = 0; i < line.length; i++) {
var l = line[i];
if (i == 0) {
path.moveTo(l.dx, l.dy);
} else {
path.lineTo(l.dx, l.dy);
}
}
path.close();
return path.contains(localPosition);
}