getOpacity method
Implementation
double getOpacity(int i) {
double diff = (currentPostion! - i);
if (diff >= -2 && diff <= 2) {
return 1.0;
} else if (diff > -3 && diff < -2) {
return 3 - diff.abs();
} else if (diff > 2 && diff < 3) {
return 3 - diff.abs();
} else {
return 0;
}
}