distanceFrom method
Calculates the square of the Euclidean distance from another color.
The distance is calculated using the rgb channels and ignores the alpha channel.
Implementation
int distanceFrom(Color other) {
return math.pow(other.red - red, 2) +
math.pow(other.blue - blue, 2) +
math.pow(other.green - green, 2) as int;
}