Unity - Scripting API: EditorGUILayout.CurveField

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Returns

AnimationCurve The curve edited by the user.

Create an animation on the different axis and assign it to a GameObject.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;public class FollowCurve : EditorWindow
{
    AnimationCurve curveX = AnimationCurve.Linear(0, 0, 10, 10);
    AnimationCurve curveY = AnimationCurve.Linear(0, 0, 10, 10);
    AnimationCurve curveZ = AnimationCurve.Linear(0, 0, 10, 10);
    [MenuItem("Examples/Create Curve For Object")]
    static void Init()
    {
        FollowCurve window = (FollowCurve)EditorWindow.GetWindow(typeof(FollowCurve));
        window.Show();
    }
    void OnGUI()
    {
        curveX = EditorGUILayout.CurveField("Animation on X", curveX);
        curveY = EditorGUILayout.CurveField("Animation on Y", curveY);
        curveZ = EditorGUILayout.CurveField("Animation on Z", curveZ);
        if (GUILayout.Button("Generate Curve"))
            AddCurveToSelectedGameObject();
    }
    void  AddCurveToSelectedGameObject()
    {
        if (Selection.activeGameObject)
        {
            FollowAnimationCurve comp =
                Selection.activeGameObject.AddComponent<FollowAnimationCurve>();
            comp.SetCurves(curveX, curveY, curveZ);
        }
        else
        {
            Debug.LogError("No Game Object selected for adding an animation curve");
        }
    }
}

And the script that works with the example: