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Packages/com.arongranberg.aline/ExampleScenes~/Example1_Gizmos/GizmoCharacterExample.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using Drawing;
+
+namespace Drawing.Examples {
+	[HelpURL("http://arongranberg.com/aline/documentation/stable/gizmocharacterexample.html")]
+	public class GizmoCharacterExample : MonoBehaviourGizmos {
+		public Color gizmoColor = new Color(1.0f, 88/255f, 85/255f);
+		public Color gizmoColor2 = new Color(79/255f, 204/255f, 237/255f);
+
+		public float movementNoiseScale = 0.2f;
+		public float startPointAttractionStrength = 0.05f;
+		public int futurePathPlotSteps = 100;
+		public int plotStartStep = 10;
+		public int plotEveryNSteps = 10;
+
+		float seed;
+		Vector3 startPosition;
+		void Start () {
+			seed = Random.value * 1000;
+			startPosition = transform.position;
+		}
+
+		Vector3 GetSmoothRandomVelocity (float time, Vector3 position) {
+			// Use perlin noise to get a smoothly varying vector
+			float t = time * movementNoiseScale + seed;
+			var dx = 2*Mathf.PerlinNoise(t, t + 5341.23145f) - 1;
+			var dy = 2*Mathf.PerlinNoise(t + 92.9842f, -t + 231.85145f) - 1;
+			var velocity = new Vector3(dx, 0, dy);
+
+			// Make a weak attractor to the start position of the agent. To make sure the agent doesn't move too far out of view
+			velocity += (startPosition - position) * startPointAttractionStrength;
+			velocity.y = 0;
+			return velocity;
+		}
+
+		void PlotFuturePath (float time, Vector3 position) {
+			float dt = 0.05f;
+
+			for (int i = 0; i < futurePathPlotSteps; i++) {
+				var v = GetSmoothRandomVelocity(time + i*dt, position);
+
+				var idx = i - plotStartStep;
+				if (idx >= 0 && idx % plotEveryNSteps == 0) {
+					Draw.Arrowhead(position, v, 0.1f, gizmoColor);
+				}
+				position += v.normalized * dt;
+			}
+		}
+
+		// Update is called once per frame
+		void Update () {
+			PlotFuturePath(Time.time, transform.position);
+			Vector3 velocity = GetSmoothRandomVelocity(Time.time, transform.position);
+			transform.rotation = Quaternion.LookRotation(velocity);
+			transform.position += transform.forward * Time.deltaTime;
+		}
+
+		public override void DrawGizmos () {
+			using (Draw.InLocalSpace(transform)) {
+				Draw.WireCylinder(Vector3.zero, Vector3.up, 2, 0.5f, gizmoColor);
+				Draw.ArrowheadArc(Vector3.zero, Vector3.forward, 0.55f, gizmoColor);
+				Draw.Label2D(Vector3.zero, gameObject.name, 14, LabelAlignment.TopCenter.withPixelOffset(0, -20), gizmoColor2);
+			}
+		}
+	}
+}