getTransform method
Implementation
Matrix4 getTransform(int index) {
final distance = centerIndex - index;
var transform = Matrix4.identity()
..setEntry(3, 2, 0.007)
..rotateY(skewAngle * distance)
..scale(1.25, 1.25, 1.25);
if (index == centerIndex) transform..scale(1.05, 1.05, 1.05);
return transform;
}