Unity Editor Script to Generate Objects in a curve

MakeCoinCurve.cs

using System.IO;
using UnityEngine;
using UnityEditor;
using System.Collections.Generic;

public class MakeCoinCurve : EditorWindow {
    private Vector3 m_startPos;

	private float m_forwardSpeed = 6f;
	private float m_upSpeed = 13.5f;
	private float m_gravity = 45f;
    private List<Vector3> m_curvePts = new List<Vector3>();

	[MenuItem("GameEditor/make coin curve")]
	public static void ShowWindow()
	{
		EditorWindow.GetWindow(typeof(MakeCoinCurve));

	}
	
	void OnGUI()
	{
		EditorGUILayout.BeginVertical();
        m_startPos = EditorGUILayout.Vector3Field("start pos", m_startPos);

		m_forwardSpeed = EditorGUILayout.FloatField("forward speed: ", m_forwardSpeed);
		m_upSpeed = EditorGUILayout.FloatField("up speed: ", m_upSpeed);
		m_gravity = EditorGUILayout.FloatField("gravity: ", m_gravity);
		EditorGUILayout.Space();
		if (GUILayout.Button("make selections curve", GUILayout.Height(20)))
		{
            makeCurvePts();
            float totallength = totalLength();
            makeCurveEqualLength(Selection.gameObjects, totallength);
		}
        if (GUILayout.Button("set Start Position", GUILayout.Height(20)))
        {
            setStartPos(Selection.gameObjects);
        }

		EditorGUILayout.EndVertical();
		
	}

	void makeCurve(GameObject[] gameObjcects)
	{
		int count = gameObjcects.Length;
		if(m_gravity == 0)
		{
			Debug.LogError("gravity == 0");
			return;
		}
		if(count < 2)
			return;

		float totalt = 2 * m_upSpeed/m_gravity;
		float t = 0;
		Vector3 pos = Vector3.zero;
		for (int i = 0; i < count; i++)
		{
			t = totalt * i/(count - 1);
			GameObject obj = gameObjcects[i];
			pos.x = m_forwardSpeed * t;
			pos.y = m_upSpeed * t - m_gravity * t * t/2;
			pos.z = 0;
			obj.transform.localPosition = pos;
		}
	}

    void makeCurvePts()
    {
        m_curvePts.Clear();
        float step = 0.01f;
        float totalt = 2 * m_upSpeed / m_gravity;
        int count = Mathf.CeilToInt( totalt / step);
        float t = 0;
        Vector3 pos = Vector3.zero;
        for (int i = 0; i < count; i++)
        {
            t = totalt * i / (count - 1);
            pos.x = m_forwardSpeed * t;
            pos.y = m_upSpeed * t - m_gravity * t * t / 2;
            pos.z = 0;
            m_curvePts.Add(pos);
        }
    }

    float totalLength()
    {
        float length = 0f;

        for (int i = 1; i < m_curvePts.Count; i++)
        {
           Vector3 seg = m_curvePts[i] - m_curvePts[i - 1];
           length += seg.magnitude;
        }    

        return length;
    }

    void makeCurveEqualLength (GameObject[] gameObjcects, float totalLength)
    {
        int count = gameObjcects.Length;
        if (m_gravity == 0)
        {
            Debug.LogError("gravity == 0");
            return;
        }
        if (count < 2)
            return;

        float averageLen = totalLength / (count-1);
        GameObject obj = gameObjcects[0];
        obj.transform.localPosition = Vector3.zero;
        int j = 1;

        float length = 0f;
        for (int i = 1; i < m_curvePts.Count; i++)
        {
            Vector3 seg = m_curvePts[i] - m_curvePts[i - 1];
            length += seg.magnitude;
            if (length > averageLen)
            {
                obj = gameObjcects[j];
                obj.transform.localPosition = m_curvePts[i];
                j++;
                length = 0;
                if(j == gameObjcects.Length -1)
                {
                    obj = gameObjcects[j];
                    obj.transform.localPosition = m_curvePts[m_curvePts.Count - 1];
                }
            }
        }

        for (int i = 0; i < gameObjcects.Length; i++)
        {
            obj = gameObjcects[i];
            obj.transform.localPosition = obj.transform.localPosition + m_startPos;
        }
    }

    void setStartPos(GameObject[] gameObjcects)
    {
        int count = gameObjcects.Length;
        Vector3 minXPos = Vector3.zero;

        if (count > 0)
            minXPos = gameObjcects[0].transform.localPosition;

        for (int i = 0; i < count; i++)
        {
            GameObject obj = gameObjcects[i];
            if (obj.transform.localPosition.x < minXPos.x)
                minXPos = gameObjcects[i].transform.localPosition;
        }

        m_startPos = minXPos;
    }
}