Add brownian behavior

source/Behavior/Behavior.ts

@@ -1,9 +1,11 @@
 import { BehaviorRecorder, IAnyBehaviorRecorder } from "@Model/Behavior";
 import { Template } from "./Template";
 import { Dynamics } from "./Dynamics";
+import { Brownian } from "./Brownian";
 
 const AllBehaviors: IAnyBehaviorRecorder[] = [
-    new BehaviorRecorder(Dynamics)
+    new BehaviorRecorder(Dynamics),
+    new BehaviorRecorder(Brownian)
 ]
 
 /**

source/Behavior/Brownian.ts

@@ -0,0 +1,109 @@
+import { Behavior } from "@Model/Behavior";
+import { Group } from "@Model/Group";
+import { Individual } from "@Model/Individual";
+import { Model } from "@Model/Model";
+
+type IBrownianBehaviorParameter = {
+    maxFrequency: "number",
+	minFrequency: "number",
+	maxStrength: "number",
+	minStrength: "number"
+}
+
+type IBrownianBehaviorEvent = {}
+
+class Brownian extends Behavior<IBrownianBehaviorParameter, IBrownianBehaviorEvent> {
+
+    public override behaviorId: string = "Brownian";
+
+    public override behaviorName: string = "$Title";
+
+    public override iconName: string = "Running";
+
+    public override describe: string = "$Intro";
+
+	public override category: string = "$Physics";
+
+	public override parameterOption = {
+		maxFrequency: {
+			type: "number",
+			name: "$Max.Frequency",
+			defaultValue: 5,
+			numberStep: .1,
+			numberMin: 0
+		},
+		minFrequency: {
+			type: "number",
+			name: "$Min.Frequency",
+			defaultValue: 0,
+			numberStep: .1,
+			numberMin: 0
+		},
+		maxStrength: {
+			type: "number",
+			name: "$Max.Strength",
+			defaultValue: .1,
+			numberStep: .01,
+			numberMin: 0
+		},
+		minStrength: {
+			type: "number",
+			name: "$Min.Strength",
+			defaultValue: 0,
+			numberStep: .01,
+			numberMin: 0
+		}
+	};
+
+    public override terms: Record<string, Record<string, string>> = {
+        "$Title": {
+            "ZH_CN": "布朗运动",
+            "EN_US": "Brownian motion"
+        },
+        "$Intro": {
+            "ZH_CN": "一种无规则的随机运动",
+            "EN_US": "An irregular random motion"
+        },
+		"$Max.Frequency": {
+            "ZH_CN": "最大频率",
+            "EN_US": "Maximum frequency"
+        },
+		"$Min.Frequency": {
+            "ZH_CN": "最小频率",
+            "EN_US": "Minimum frequency"
+        },
+		"$Max.Strength": {
+            "ZH_CN": "最大强度",
+            "EN_US": "Maximum strength"
+        },
+		"$Min.Strength": {
+            "ZH_CN": "最小强度",
+            "EN_US": "Minimum strength"
+        }
+    };
+
+	public effect(individual: Individual, group: Group, model: Model, t: number): void {
+
+		const {maxFrequency, minFrequency, maxStrength, minStrength} = this.parameter;
+
+		let nextTime = individual.getData("Brownian.nextTime") ?? 
+		minFrequency +  Math.random() * (maxFrequency - minFrequency);
+		let currentTime = individual.getData("Brownian.currentTime") ?? 0;
+		
+		currentTime += t;
+		if (currentTime > nextTime) {
+			individual.applyForce(
+				minStrength + (Math.random() * 2 - 1) * (maxStrength - minStrength),
+				minStrength + (Math.random() * 2 - 1) * (maxStrength - minStrength),
+				minStrength + (Math.random() * 2 - 1) * (maxStrength - minStrength)
+			);
+			nextTime = minFrequency +  Math.random() * (maxFrequency - minFrequency);
+			currentTime = 0;
+		}
+
+		individual.setData("Brownian.nextTime", nextTime);
+		individual.setData("Brownian.currentTime", currentTime);
+	}
+}
+
+export { Brownian };

source/Behavior/Template.ts

@@ -1,4 +1,7 @@
 import { Behavior } from "@Model/Behavior";
+import { Group } from "@Model/Group";
+import { Individual } from "@Model/Individual";
+import { Model } from "@Model/Model";
 
 type ITemplateBehaviorParameter = {
     
@@ -16,7 +19,9 @@ class Template extends Behavior<ITemplateBehaviorParameter, ITemplateBehaviorEve
 
     public override describe: string = "$Intro";
 
-    terms: Record<string, Record<string, string>> = {
+    public override category: string = "$Category";
+
+    public override terms: Record<string, Record<string, string>> = {
         "$Title": {
             "ZH_CN": "行为",
             "EN_US": "Behavior"
@@ -26,6 +31,10 @@ class Template extends Behavior<ITemplateBehaviorParameter, ITemplateBehaviorEve
             "EN_US": "This is a template behavior"
         }
     };
+
+    public effect(individual: Individual, group: Group, model: Model, t: number): void {
+        
+    }
 }
 
 export { Template };