Add graduation color line implementation

[dollplayer2501]

Square graduation color is already impremented.

BUT,
for exxample, X=n, Y=0 and X=0, Y=n are relatively easy, but X=n and Y=n is very hard to impplement for me.
Therefore, in the case of X=n and Y=n, there is a possibility that it will be excluded on the system side.