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Question by bamncan · Apr 12, 2020 at 10:21 AM · array of gameobjectsloopingindexoutofrangeexception

Getting older elements of an Array/List and looping to the latest elements if index is less than zero

Hello,

I'm trying to figure out the logic for grabbing older elements of a List (array).

I have an array that stores a gameobject in repetition. For the sake of argument, let's say it stores a game object every frame for up to a total count of 7 frames. So the 7th frame is stored on array[6] and the 8th frame would overwrite the object at array[0].

How would I grab the 3rd and 6th oldest elements given the current index of the current element being written?

so say current index of the current frame is storing into index 2 (array[2]), the history would be index 1, 0, 6, 5, 4, 3. So how could I calculate that I would need array[6] and array[3]?

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Answer by bamncan · Apr 13, 2020 at 01:07 AM

For now, I just had to create a switch statement since I haven't figured out an algebraic method to automatically do it yet:

 int third = 0;
 int sixth = 3;
 switch (index) {
     case 0:
         third = 5; sixth = 2;
         break;
     case 1:
         third = 6; sixth = 3;
         break;
     case 2:
         third = 0; sixth = 4;
         break;
     case 3:
         third = 1; sixth = 5;
         break;
     case 4:
         third = 2; sixth = 6;
         break;
     case 5:
         third = 3; sixth = 0;
         break;
     case 6:
         third = 4; sixth = 1;
         break;
 }
 
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