Unity中制作游戏的快照游戏支持玩家拍快照

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Unity中制作游戏的快照游戏支持玩家拍快照

有些游戏支持玩家“拍快照”,也就是将游戏的精彩瞬间以图片的形式记录下来的功能。这个功能比较有趣,而且以后的用途也会很广,为此本节打算介绍:截取矩形区域内游戏视图,并将其显示在视图其它区域的方法。具体的操作步骤如下本文选自Unity游戏开发技巧集锦

(1)在Project视图里,创建一个C#脚本文件,并命名为ScreenTexture。在此脚本中编写如下的代码:

  • 01     using UnityEngine;
  • 02     using System.Collections;
  • 03    
  • 04     public class ScreenTexture : MonoBehaviour
  • 05     
  • 06              //公有成员
  • 07              public int photoWidth = 50;                                    //矩形的宽度
  • 08              public int photoHeight = 50;                                  //矩形的高度
  • 09              public int thumbProportion = 25;                          //截图的显示比例
  • 10              public Color borderColor = Color.white;             //矩形框架的颜色
  • 11              public int borderWidth = 2;                                              //矩形框的宽度
  • 12              //私有成员
  • 13              private Texture2D texture;
  • 14              private Texture2D border;
  • 15              private int screenWidth;
  • 16              private int screenHeight;
  • 17              private int frameWidth;
  • 18              private int frameHeight;
  • 19              private bool shoot = false;
  • 20              // 脚本初始化时,调用此函数
  • 21              void Start ()
  • 22              
  • 23                       screenWidth = Screen.width;
  • 24                       screenHeight = Screen.height;
  • 25                       frameWidth = Mathf.RoundToInt(screenWidth * photoWidth * 0.01f);
  • 26                       frameHeight = Mathf.RoundToInt(screenHeight * photoHeight * 0.01f);
  • 27                       texture = new Texture2D (frameWidth,frameHeight,TextureFormat.RGB24,false);
  • 28                       border = new Texture2D (1,1,TextureFormat.ARGB32, false);
  • 29                       border.SetPixel(0,0,borderColor);
  • 30                       border.Apply();
  • 31              
  • 32              // 运行游戏时,每帧都调用此函数
  • 33              void Update ()
  • 34              
  • 35                        //鼠标左键按下的时候
  • 36                       if (Input.GetKeyUp(KeyCode.Mouse0))
  • 37                                 StartCoroutine(CaptureScreen());
  • 38              
  • 39              //在Game视图上,绘制纹理
  • 40              void OnGUI ()
  • 41              
  • 42                        //绘制矩形框的四个边
  • 43                       GUI.DrawTexture(
  • 44                                                   new Rect(
  • 45                                                             (screenWidth*0.5f)-(frameWidth*0.5f) - borderWidth*2,
  • 46                                                             ((screenHeight*0.5f)-(frameHeight*0.5f)) - borderWidth,
  • 47                                                             frameWidth + borderWidth*2,
  • 48                                                             borderWidth),
  • 49                                                   border,ScaleMode.StretchToFill);
  • 50                       GUI.DrawTexture(
  • 51                                                   new Rect(
  • 52                                                             (screenWidth*0.5f)-(frameWidth*0.5f) - borderWidth*2,
  • 53                                                             (screenHeight*0.5f)+(frameHeight*0.5f),
  • 54                                                             frameWidth + borderWidth*2,
  • 55                                                             borderWidth),
  • 56                                                   border,ScaleMode.StretchToFill);
  • 57                       GUI.DrawTexture(
  • 58                                                   new Rect(
  • 59                                                             (screenWidth*0.5f)-(frameWidth*0.5f)- borderWidth*2,
  • 60                                                             (screenHeight*0.5f)-(frameHeight*0.5f),
  • 61                                                             borderWidth,
  • 62                                                             frameHeight),
  • 63                                                   border,ScaleMode.StretchToFill);
  • 64                       GUI.DrawTexture(
  • 65                                                   new Rect(
  • 66                                                             (screenWidth*0.5f)+(frameWidth*0.5f),
  • 67                                                             (screenHeight*0.5f)-(frameHeight*0.5f),
  • 68                                                             borderWidth,
  • 69                                                             frameHeight),
  • 70                                                   border,ScaleMode.StretchToFill);
  • 71                        //绘制矩形框中截取到的Game视图
  • 72                       if(shoot)
  • 73                       
  • 74                                 GUI.DrawTexture(
  • 75                                                   new Rect (
  • 76                                                             10,
  • 77                                                             10,
  • 78                                                             frameWidth*thumbProportion*0.01f,
  • 79                                                             frameHeight*thumbProportion* 0.01f),
  • 80                                                   texture,ScaleMode.StretchToFill);
  • 81                       
  • 82              
  • 83              //截取矩形框里的Game视图
  • 84              IEnumerator CaptureScreen ()
  • 85              
  • 86                       yield return new WaitForEndOfFrame();
  • 87                       texture.ReadPixels(
  • 88                                 new Rect(
  • 89                                          (screenWidth*0.5f)-(frameWidth*0.5f),
  • 90                                (screenHeight*0.5f)-(frameHeight*0.5f),
  • 91                                frameWidth,
  • 92                                          frameHeight),
  • 93                                 0,0);
  • 94                       texture.Apply();
  • 95                       shoot = true;
  • 96              
  • 97     

脚本代码中,40行的OnGUI()函数,使用GUI.DrawTexture()绘制了矩形框,以及矩形框中截取到的游戏视图;84行的CaptureScreen()函数,使用texture.ReadPixels()读取矩形框中的所有像素点,然后存储到texture中。触发“拍照”功能的操作是,在Game视图中的任意位置,单击鼠标左键,即36行代码实现的功能。

(2)将脚本ScreenTexture赋予Main Camera,然后选中Main Camera,在Inspector视图里可以设置脚本组件的一些属性,如图2-19所示本文选自Unity游戏开发技巧集锦


图2-19  Main Camera上ScreenTexture脚本组件的各属性       图2-20  当前的Scene视图

(3)为游戏的场景添加一些几何体,并调整它们各自的位置,如图2-20所示。

(4)运行游戏,当在Game视图中的任意位置,单击鼠标左键的时候,可在视图的左上角看到矩形框中截取到的游戏视图,如图2-21所示本文选自Unity游戏开发技巧集锦


图2-21  运行游戏,查看截图的效果

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