用unity3d切割图片

1 using UnityEngine;2 using System;3 using System.Collections;4 using System.Xml;5 using System.IO;6 7 public class ClipPic : MonoBehaviour {8 9 Texture2D newTexture;
10 public Texture2D resTexture;
11 Color color;
12
13 string picName;
14 int picPos_x,picPos_y;
15 int picWidth,picHeight;
16
17
18 // Use this for initialization
19 void Start () {
20 XmlDocument xmlDoc &＃61; new XmlDocument();
21 string xml &＃61; Resources.Load("test").ToString();
22 xmlDoc.LoadXml(xml);
23 XmlNode xn &＃61; xmlDoc.SelectSingleNode("Imageset");
24 XmlNodeList xnl &＃61; xn.ChildNodes;
25 foreach (XmlNode xnf in xnl)
26 {
27 XmlElement xe &＃61; (XmlElement)xnf;
28 // Debug.Log("Name&＃61;" &＃43; xe.GetAttribute("Name"));
29 // Debug.Log("\t");
30 // Debug.Log("xpos&＃61;" &＃43; xe.GetAttribute("XPos"));
31 // Debug.Log("\t");
32 // Debug.Log("ypos&＃61;" &＃43; xe.GetAttribute("YPos"));
33 // Debug.Log("\t");
34 // Debug.Log("width&＃61;" &＃43; xe.GetAttribute("Width"));
35 // Debug.Log("\t");
36 // Debug.Log("height&＃61;" &＃43; xe.GetAttribute("Height"));
37 picName &＃61; xe.GetAttribute("Name");
38 picPos_x &＃61; Convert.ToInt32(xe.GetAttribute("XPos"));
39 picPos_y &＃61; Convert.ToInt32(xe.GetAttribute("YPos"));
40 picWidth &＃61; Convert.ToInt32(xe.GetAttribute("Width"));
41 picHeight &＃61; Convert.ToInt32(xe.GetAttribute("Height"));
42 newTexture &＃61; new Texture2D(picWidth,picHeight);
43 for(int m&＃61;picPos_y;m44 {
45 for(int n&＃61;picPos_x;n46 {
47 color &＃61; resTexture.GetPixel(n,resTexture.height-m);
48 newTexture.SetPixel(n-picPos_x,picHeight-(m-picPos_y),color);
49 }
50 }
51 newTexture.Apply();
52 byte[] b &＃61; newTexture.EncodeToPNG();
53 File.WriteAllBytes("Assets/Resources/out/"&＃43;picName&＃43;".png",b);
54 }
55
56 }
57
58 }

需求&＃xff1a;把图片的像素中不为alpha的部分切出来保存成单个图片。之前打算用Texture2D.GetPixel()遍历整张图片&＃xff0c;判断每一个像素的alpha是否为0&＃xff0c;接着对每一个像素判断是否为临界的像素点&＃xff0c;最后用new一个Texture2D用Texture2D.SetPixel()赋值像素的RGBA。但是存在一种特殊的情况&＃xff0c;那就是想要截取的图片中有alpha&＃61;0的时候&＃xff0c;这个方法就蛋疼了。于是乎又另图思路&＃xff0c;结合CEImagesetEditor这个开源的工具来完成这个工作&＃xff0c;虽然这种方法不够"智能"&＃xff0c;但是截取的很准确。用CEImagesetEditor工具定位要截取的位置和大小后能生成一个XML文件&＃xff0c;这个文件包含要截取图片的名字、位置以及大小。XML文件形如&＃xff1a;
"1.0" encoding&＃61;"UTF-8"?>"test" Imagefile&＃61;"test\roomlist.tga" >"name" XPos&＃61;"190" YPos&＃61;"59" Width&＃61;"60" Height&＃61;"25" />"photo" XPos&＃61;"32" YPos&＃61;"48" Width&＃61;"127" Height&＃61;"206" />"sumbit" XPos&＃61;"55" YPos&＃61;"264" Width&＃61;"65" Height&＃61;"38" />


接着依次做的事情有&＃xff1a;解析XML文件&＃xff0c;新建Texture2D&＃xff0c;根据XML的信息遍历制定的区域&＃xff0c;获取指定区域的像素RGBA值&＃xff0c;RGBA赋值给Texture2D&＃xff0c;保存到当前工程的某一目录中。1 using UnityEngine;2 using System;3 using System.Collections;4 using System.Xml;5 using System.IO;6 7 public class ClipPic : MonoBehaviour {8 9 Texture2D newTexture;
10 public Texture2D resTexture;
11 Color color;
12
13 string picName;
14 int picPos_x,picPos_y;
15 int picWidth,picHeight;
16
17
18 // Use this for initialization
19 void Start () {
20 XmlDocument xmlDoc &＃61; new XmlDocument();
21 string xml &＃61; Resources.Load("test").ToString();
22 xmlDoc.LoadXml(xml);
23 XmlNode xn &＃61; xmlDoc.SelectSingleNode("Imageset");
24 XmlNodeList xnl &＃61; xn.ChildNodes;
25 foreach (XmlNode xnf in xnl)
26 {
27 XmlElement xe &＃61; (XmlElement)xnf;
28 // Debug.Log("Name&＃61;" &＃43; xe.GetAttribute("Name"));
29 // Debug.Log("\t");
30 // Debug.Log("xpos&＃61;" &＃43; xe.GetAttribute("XPos"));
31 // Debug.Log("\t");
32 // Debug.Log("ypos&＃61;" &＃43; xe.GetAttribute("YPos"));
33 // Debug.Log("\t");
34 // Debug.Log("width&＃61;" &＃43; xe.GetAttribute("Width"));
35 // Debug.Log("\t");
36 // Debug.Log("height&＃61;" &＃43; xe.GetAttribute("Height"));
37 picName &＃61; xe.GetAttribute("Name");
38 picPos_x &＃61; Convert.ToInt32(xe.GetAttribute("XPos"));
39 picPos_y &＃61; Convert.ToInt32(xe.GetAttribute("YPos"));
40 picWidth &＃61; Convert.ToInt32(xe.GetAttribute("Width"));
41 picHeight &＃61; Convert.ToInt32(xe.GetAttribute("Height"));
42 newTexture &＃61; new Texture2D(picWidth,picHeight);
43 for(int m&＃61;picPos_y;mm)
44 {
45 for(int n&＃61;picPos_x;nn)
46 {
47 color &＃61; resTexture.GetPixel(n,resTexture.height-m);
48 newTexture.SetPixel(n-picPos_x,picHeight-(m-picPos_y),color);
49 }
50 }
51 newTexture.Apply();
52 byte[] b &＃61; newTexture.EncodeToPNG();
53 File.WriteAllBytes("Assets/Resources/out/"&＃43;picName&＃43;".png",b);
54 }
55
56 }
57
58 }
PS:图片坐标原点不同&＃xff0c;CEImagesetEditor在图片左上角&＃xff1b;Unity3d在图片左下角。