So in Final Fantasy 14, you have a cute companion, a Chocobo! You can change the color of your Chocobo:
The default color of the chocobo is Desert Yellow. Players can change the color of their Chocobo by feeding them snacks...
The color value is tracked in RGB, so the default value (Desert Yellow) is 216/180/87.
Different fruit will change the Chocobo color in different ways:
Snack Effect R G B
--------------------- ----------------------------------------------------- ----- ----- -----
Xelphatol Apple Increases red hue, also reduces blue and green hues. +5 -5 -5
Mamook Pear Increases green hue, also reduces blue and red hues. -5 +5 -5
O'Ghomoro Berries Increases blue hue, also reduces green and red hues. -5 -5 +5
Doman Plum Reduces red hue, also increases blue and green hues. -5 +5 +5
Valfruit Reduces green hue, also increases blue and red hues. +5 -5 +5
Cieldalaes Pineapple Reduces blue hue, also increases green and red hues. +5 +5 -5
Han Lemon Restores to default Desert Yellow color
However, you have to take care to avoid going under 0 or over 255 in any hue, or the fruit won't work!
The player has to be careful not to exceed 255 or go below 0 in any of the three RGB values, or the change will fail.
So, my goal is to figure out:
What fruit do I need to feed my Chocobo to get from Hunter Green (40/75/38) to Ink Blue (26/31/39)?
And even better:
What order should the fruit be fed in to avoid going over max?
I think that I can use SWI Prolog's CLPFD library for this! I was thinking I should create relations representing the number of fruits, something like:
zozo = [40,75,38].
goal = [26, 31, 39].
apple(zozo, goal, NumberApples).An apple will change:
- Red + 5
- Green - 5
- Blue - 5
And then I imagine I have to describe how NumberApples is related to the solution, something like...
apple([StartRed, StartGreen, StartBlue], [GoalRed, GoalGreen, GoalBlue], NumApples) :-
GoalRed #= StartRed + (NumApples * 5),
GoalGreen #= StartGreen + (NumApples * -5),
GoalBlue #= StartBlue + (NumApples * -5).And I think we need to have all the fruits represented here...?