Camera Movement

I wrote this script for camera movement, now it goes with the mouse movement in the X and Y, and it zoom IN and OUT... BUT now i have 2 problems:
1- I can't force the movement to stop by the end of my terrain in the X,Y.
2- I want to control the zoom IN and OUT, cause it keeps zooming with the mouse wheel.
How can I restrict those 2 options.. !!! (Thanks)

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class MoveCamera : MonoBehaviour {
5.  
6.     public GameObject cameraObject;
7.     public float speed = 1;
8.  
9.     // Use this for initialization
10.     void Start () {
11.  
12.     }
13.  
14.     // Update is called once per frame
15.     void Update () {
16.         if (Input.GetAxis ("Mouse ScrollWheel") > 0) {
17.             cameraObject.transform.position= new Vector3(cameraObject.transform.position.x, cameraObject.transform.position.y +(1*speed) ,    cameraObject.transform.position.z);
18.         }
19.         if (Input.GetAxis ("Mouse ScrollWheel") < 0){
20.             cameraObject.transform.position= new Vector3(cameraObject.transform.position.x, cameraObject.transform.position.y -(1*speed) , cameraObject.transform.position.z);
21.         }
22.         if (Input.mousePosition.x >= (Screen.width * 0.9)){
23.             cameraObject.transform.position = new Vector3(cameraObject.transform.position.x +(1*speed),cameraObject.transform.position.y, cameraObject.transform.position.z);
24.         }
25.         if (Input.mousePosition.x <= (Screen.width*0.1)){
26.             cameraObject.transform.position = new Vector3 (cameraObject.transform.position.x -(1*speed),cameraObject.transform.position.y, cameraObject.transform.position.z);
27.         }
28.         if (Input.mousePosition.y >= (Screen.height * 0.9)){
29.             cameraObject.transform.position = new Vector3(cameraObject.transform.position.x, cameraObject.transform.position.y, cameraObject.transform.position.z + (1* speed));
30.         }
31.         if (Input.mousePosition.y <= (Screen.height * 0.1)){
32.                 cameraObject.transform.position = new Vector3(cameraObject.transform.position.x, cameraObject.transform.position.y, cameraObject.transform.position.z - (1*speed));
33.         }
34.     }
35. }
36.  
37.  

 

If you have a limiting values in mind, I think Mathf.Min and Mathf.Max might be the solutions you are looking for. Alternatively you could add && (Condition) to your if statements.

 

I'd either use a separate pair of "if" statement (one for x and one for y), or use two Mathf.Clamp() statements (again, one for x direction and the other for y).

 

Thank you all .. i used Mathf.Clamp for X and Z..

Code (JavaScript):

1. function Update () {
2.  
3.      var xMove : float = Input.GetAxis("Horizontal") * Time.deltaTime * 20;
4.      transform.Translate(Vector3(xMove,0,0));
5.      transform.position.x = Mathf.Clamp(transform.position.x, -120, 120);
6.      transform.position.z = Mathf.Clamp(transform.position.z, -206, 25);

but Mathf, still can't use it for the mouse scroll .. when i tried, the camera acted weird and the scene disappeared.. any workout for this !!