mirror of
https://github.com/yogstation13/Yogstation.git
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1c0355a19d
* Added a generic (array based) heap data structure * Changed A* to use a heap open set instead of a priority queue * Fixed A* not checking for already processed turfs * Fixed A* number of traversed nodes not being updated on new route * Changed the heuristic proc for every A* calls to /turf/proc/Distance_cardinal, since A* now only progress in cardinal directions
83 lines
1.7 KiB
Plaintext
83 lines
1.7 KiB
Plaintext
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//////////////////////
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//PriorityQueue object
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//////////////////////
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//an ordered list, using the cmp proc to weight the list elements
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/PriorityQueue
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var/list/L //the actual queue
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var/cmp //the weight function used to order the queue
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/PriorityQueue/New(compare)
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L = new()
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cmp = compare
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/PriorityQueue/proc/IsEmpty()
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return !L.len
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//return the index the element should be in the priority queue using dichotomic search
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/PriorityQueue/proc/FindElementIndex(atom/A)
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var/i = 1
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var/j = L.len
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var/mid
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while(i < j)
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mid = round((i+j)/2)
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if(call(cmp)(L[mid],A) < 0)
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i = mid + 1
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else
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j = mid
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if(i == 1 || i == L.len) //edge cases
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return (call(cmp)(L[i],A) > 0) ? i : i+1
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else
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return i
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//add an element in the list,
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//immediatly ordering it to its position using dichotomic search
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/PriorityQueue/proc/Enqueue(atom/A)
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if(!L.len)
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L.Add(A)
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return
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L.Insert(FindElementIndex(A),A)
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//removes and returns the first element in the queue
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/PriorityQueue/proc/Dequeue()
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if(!L.len)
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return 0
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. = L[1]
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Remove(.)
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//removes an element
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/PriorityQueue/proc/Remove(atom/A)
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return L.Remove(A)
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//returns a copy of the elements list
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/PriorityQueue/proc/List()
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. = L.Copy()
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//return the position of an element or 0 if not found
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/PriorityQueue/proc/Seek(atom/A)
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. = L.Find(A)
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//return the element at the i_th position
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/PriorityQueue/proc/Get(i)
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if(i > L.len || i < 1)
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return 0
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return L[i]
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//replace the passed element at it's right position using the cmp proc
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/PriorityQueue/proc/ReSort(atom/A)
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var/i = Seek(A)
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if(i == 0)
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return
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while(i < L.len && call(cmp)(L[i],L[i+1]) > 0)
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L.Swap(i,i+1)
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i++
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while(i > 1 && call(cmp)(L[i],L[i-1]) <= 0) //last inserted element being first in case of ties (optimization)
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L.Swap(i,i-1)
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i-- |