GUI.HorizontalSlider
static function HorizontalSlider(position: Rect, value: float, leftValue: float, rightValue: float): float;
static float HorizontalSlider(Rect position, float value, float leftValue, float rightValue);
static def HorizontalSlider(position as Rect, value as float, leftValue as float, rightValue as float) as float
static function HorizontalSlider(position: Rect, value: float, leftValue: float, rightValue: float, slider: GUIStyle, thumb: GUIStyle): float;
static float HorizontalSlider(Rect position, float value, float leftValue, float rightValue, GUIStyle slider, GUIStyle thumb);
static def HorizontalSlider(position as Rect, value as float, leftValue as float, rightValue as float, slider as GUIStyle, thumb as GUIStyle) as float
Parameters

position Rectangle on the screen to use for the slider.
value The value the slider shows. This determines the position of the draggable thumb.
leftValue The value at the left end of the slider.
rightValue The value at the right end of the slider.
slider The GUIStyle to use for displaying the dragging area. If left out, the horizontalSlider style from the current GUISkin is used.
thumb The GUIStyle to use for displaying draggable thumb. If left out, the horizontalSliderThumb style from the current GUISkin is used.
Returns
float The value that has been set by the user.
Description

A horizontal slider the user can drag to change a value between a min and a max.

	// Draws a horizontal slider control that goes from 0 to 10.
	var hSliderValue : float = 0.0;
	
	function OnGUI () {
		hSliderValue = GUI.HorizontalSlider (Rect (25, 25, 100, 30), hSliderValue, 0.0, 10.0);
	}

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    public float hSliderValue = 0.0F;
    void OnGUI() {
        hSliderValue = GUI.HorizontalSlider(new Rect(25, 25, 100, 30), hSliderValue, 0.0F, 10.0F);
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	public hSliderValue as float = 0.0F

	def OnGUI() as void:
		hSliderValue = GUI.HorizontalSlider(Rect(25, 25, 100, 30), hSliderValue, 0.0F, 10.0F)