_queue : high = middle else : finalPos = middle + 1 self. finalPos = 0 high = len ( self ) while finalPos < high : middle = ( finalPos + high ) // 2 if tuple < self. If a # tuple with equal priority is encountered, the new tuple is # inserted after it. ''' tuple = # Insert the tuple in sorted position in the queue. _queue ) def enqueue ( self, value, priority = 0.0 ): ''' Append a new element to the queue according to its priority. _queue = def _len_ ( self ): return len ( self. PriorityQueue also features the method adjustPriorities which adds a certain value to all priorities in the queue.Д¬lass PriorityQueue : def _init_ ( self ): self. This uses a sorted array, such that things with the same priority are ordered by their insertion order. Of course, first we need our priority queue. The creature is then allowed to act, after which it is placed back into the queue with its own delay. To represent the passage of time, the active creature's last priority is subtracted from all priority keys in the queue. To execute a turn, a creature is pulled off the queue, along with the priority it was given. Faster creatures have a lower delay, and can be calculated by dividing a base delay value by the creature's speed (watch out for divide-by-zero errors). When the game starts, all creatures on a level (including the player) are inserted into the priority queue with a priority equal to a certain delay. These delays are handled by using a priority queue. Referring to the last example, the player would have twice the speed as the giant slug, and therefore receives half the delay between his or her turns. The turn delay is shorter for faster creatures. Faster creatures may have turns between this delay. When a creature take a turn, there is some delay until it may act again.

To achieve this effect, a creatures speed is thought of giving it a delay between its actions. For example, the player may take two turns for every one turn the giant slug makes, while the player is outrun by the bat who takes three turns for every turn the player makes. When creatures take turns in a roguelike, sometimes it is desireable to have faster creatures to receive more turns relative to other creatures. Events include monster and player actions, and therefore is able to represent the relative speed of different creatures. This is an implementation in Python of a turn scheduling system that uses a priority queue.

1 A priority queue based turn scheduling systemДЄ priority queue based turn scheduling system.

Priority queue python