制作小地图首先需要两个贴图：第一个贴图是小地图的背景贴图，它应当是从y轴向下俯视截取的贴图；第二个贴图是主角位置贴图，它应当是在背景贴图之上的小型矩形。
1 using UnityEngine;
2 using System.Collections;
3
4 public class smallMap : MonoBehaviour {
5 // Use this for initialization
6 GameObject plane; //大地图地形对象
7 GameObject cube; //大地图主角对象
8 float mapWidth; //大地图的宽度
9 float mapHeight; //大地图的高度
10 //地图边界检查
11 float widthCheck;
12 float heightCheck;
13 //小地图主角位置
14 float mapcube_x = 0;
15 float mapcube_y = 0;
16 //GUI按钮是否被按下
17 bool keyUp;
18 bool keyDown;
19 bool keyLeft;
20 bool keyRight;
21
22 public Texture map; //小地图的贴图
23 public Texture map_cube; //小地图的主角贴图
24 void Start () {
25 plane = GameObject.Find("Plane");
26 cube = GameObject.Find("Cube");
27 float size_x = plane.GetComponent<MeshFilter>().mesh.bounds.size.x; //得到大地图的默认宽度
28 float scale_x = plane.transform.localScale.x; //得到大地图宽度的缩放比例
29 float size_z = plane.GetComponent<MeshFilter>().mesh.bounds.size.z; //得到大地图的默认高度
30 float scale_z = plane.transform.localScale.z; //得到大地图高度的缩放比例
31 mapWidth = size_x * scale_x;
32 mapHeight = size_z * scale_z;
33 widthCheck = mapWidth / 2;
34 heightCheck = mapHeight / 2;
35 check();
36 }
37
38 // Update is called once per frame
39 void Update () {
40
41 }
42
43 void OnGUI() {
44 keyUp = GUILayout.RepeatButton("向前移动");
45 keyDown = GUILayout.RepeatButton("向后移动");
46 keyRight = GUILayout.RepeatButton("向右移动");
47 keyLeft = GUILayout.RepeatButton("向左移动");
48 GUI.DrawTexture(new Rect(Screen.width - map.width, 0, map.width, map.height), map);
49 GUI.DrawTexture(new Rect(mapcube_x, mapcube_y, map_cube.width, map_cube.height), map_cube);
50 }
51
52 void FixedUpdate() {
53 if (keyUp) {
54 cube.transform.Translate(Vector3.forward * Time.deltaTime * 5);
55 check();
56 }
57 if (keyDown) {
58 cube.transform.Translate(-Vector3.forward * Time.deltaTime * 5);
59 check();
60 }
61 if (keyRight) {
62 cube.transform.Translate(Vector3.right * Time.deltaTime * 5);
63 check();
64 }
65 if (keyLeft) {
66 cube.transform.Translate(Vector3.left * Time.deltaTime * 5);
67 check();
68 }
69 }
70
71 void check() {
72 float x = cube.transform.position.x;
73 float z = cube.transform.position.z;
74 if (x < -widthCheck) {
75 x = -widthCheck;
76 }
77 if (x > widthCheck) {
78 x = widthCheck;
79 }
80 if (z < -heightCheck) {
81 z = -heightCheck;
82 }
83 if (z > heightCheck) {
84 z = heightCheck;
85 }
86 mapcube_x = (map.width / mapWidth * x) + ((map.width / 2) - (map_cube.width / 2)) + (Screen.width - map.width);
87 mapcube_y = map.height - ((map.height / mapHeight * z) + (map.height / 2));
88 }
89 }
