From 97da432c35b8c7aaf9dd2c39e2aa4b1f55f36065 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Wed, 27 Jan 2021 16:15:06 +0800
Subject: +behaviour designer

---
 .../Runtime/Composites/RandomSequence.cs           | 103 +++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 Client/Assets/Behavior Designer/Runtime/Composites/RandomSequence.cs

(limited to 'Client/Assets/Behavior Designer/Runtime/Composites/RandomSequence.cs')

diff --git a/Client/Assets/Behavior Designer/Runtime/Composites/RandomSequence.cs b/Client/Assets/Behavior Designer/Runtime/Composites/RandomSequence.cs
new file mode 100644
index 00000000..0d4e2223
--- /dev/null
+++ b/Client/Assets/Behavior Designer/Runtime/Composites/RandomSequence.cs	
@@ -0,0 +1,103 @@
+using UnityEngine;
+using System.Collections.Generic;
+
+namespace BehaviorDesigner.Runtime.Tasks
+{
+    [TaskDescription("Similar to the sequence task, the random sequence task will return success as soon as every child task returns success.  " +
+                     "The difference is that the random sequence class will run its children in a random order. The sequence task is deterministic " +
+                     "in that it will always run the tasks from left to right within the tree. The random sequence task shuffles the child tasks up and then begins " +
+                     "execution in a random order. Other than that the random sequence class is the same as the sequence class. It will stop running tasks " +
+                     "as soon as a single task ends in failure. On a task failure it will stop executing all of the child tasks and return failure. " +
+                     "If no child returns failure then it will return success.")]
+    [HelpURL("http://www.opsive.com/assets/BehaviorDesigner/documentation.php?id=31")]
+    [TaskIcon("{SkinColor}RandomSequenceIcon.png")]
+    public class RandomSequence : Composite
+    {
+        [Tooltip("Seed the random number generator to make things easier to debug")]
+        public int seed = 0;
+        [Tooltip("Do we want to use the seed?")]
+        public bool useSeed = false;
+
+        // A list of indexes of every child task. This list is used by the Fischer-Yates shuffle algorithm.
+        private List<int> childIndexList = new List<int>();
+        // The random child index execution order.
+        private Stack<int> childrenExecutionOrder = new Stack<int>();
+        // The task status of the last child ran.
+        private TaskStatus executionStatus = TaskStatus.Inactive;
+
+        public override void OnAwake()
+        {
+            // If specified, use the seed provided.
+            if (useSeed) {
+                Random.InitState(seed);
+            }
+
+            // Add the index of each child to a list to make the Fischer-Yates shuffle possible.
+            childIndexList.Clear();
+            for (int i = 0; i < children.Count; ++i) {
+                childIndexList.Add(i);
+            }
+        }
+
+        public override void OnStart()
+        {
+            // Randomize the indecies
+            ShuffleChilden();
+        }
+
+        public override int CurrentChildIndex()
+        {
+            // Peek will return the index at the top of the stack.
+            return childrenExecutionOrder.Peek();
+        }
+
+        public override bool CanExecute()
+        {
+            // Continue exectuion if no task has return failure and indexes still exist on the stack.
+            return childrenExecutionOrder.Count > 0 && executionStatus != TaskStatus.Failure;
+        }
+
+        public override void OnChildExecuted(TaskStatus childStatus)
+        {
+            // Pop the top index from the stack and set the execution status.
+            if (childrenExecutionOrder.Count > 0) {
+                childrenExecutionOrder.Pop();
+            }
+            executionStatus = childStatus;
+        }
+
+        public override void OnConditionalAbort(int childIndex)
+        {
+            // Start from the beginning on an abort
+            childrenExecutionOrder.Clear();
+            executionStatus = TaskStatus.Inactive;
+            ShuffleChilden();
+        }
+
+        public override void OnEnd()
+        {
+            // All of the children have run. Reset the variables back to their starting values.
+            executionStatus = TaskStatus.Inactive;
+            childrenExecutionOrder.Clear();
+        }
+
+        public override void OnReset()
+        {
+            // Reset the public properties back to their original values
+            seed = 0;
+            useSeed = false;
+        }
+
+        private void ShuffleChilden()
+        {
+            // Use Fischer-Yates shuffle to randomize the child index order.
+            for (int i = childIndexList.Count; i > 0; --i) {
+                int j = Random.Range(0, i);
+                int index = childIndexList[j];
+                childrenExecutionOrder.Push(index);
+                childIndexList[j] = childIndexList[i - 1];
+                childIndexList[i - 1] = index;
+            }
+        }
+    }
+}
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