【跟我一起学Unity3D】代码中切割图片并且加载帧序列动画

标签：unity3d   序列帧   切图   

在Cocos2dx中，对大图的处理已经封装好了一套自己的API，但是在Unity3D中貌似没有类似的API，或者说我没找到。不过这也在情理之中，毕竟Unity3D是做3D的，要切割图片的地方还是很少的。

因为我用Unity3D主要是用于做2D游戏的（PS：很蛋疼吧？我也觉得），所以就不得不考虑切图和播放序列帧这两个在2D上常见的功能了，下面废话不多说。我的任务是把下面这张图切割成16块，并且按照动画的序列播放出来。

查Unity3D的使用手册的过程中，我发现了一个类：Texture2D，他是继承Texture的，主要是用于创建2D纹理的，非常符合切图的需要。

首先，我们需要加载大图，加载大图有一个非常简单的方法，就是创建一个public的Texture2D类成员变量，然后在编辑器中直接拖动到上去给他赋值就可以了。

当然也可以采用动态加载图片资源的方法，这种方法比较麻烦，需要把图片先转换成二进制流，然后赋值给Texture2D

	//加载图片资源
	void LoadTexture()
	{
		using (FileStream file = File.Open (Application.dataPath + "/Textures/Player.png", FileMode.Open))
		{
			using (BinaryReader reader = new BinaryReader(file))
			{
				m_texPlayer = new Texture2D (192, 256, TextureFormat.ARGB4444, false);
				texture.LoadImage (reader.ReadBytes((int)file.Length));
			}
		}
	}

下面是第一步：

        for (int i = 0; i < m_iMinPicColumnCount; ++i)
        {
            for (int j = 0; j < m_iMinPicRowCount; ++j)
                DePackTexture(i, j);
        }

    //切图
    void DePackTexture(int i, int j)
    {
        int cur_x = i * m_iMinPicWidth;
        int cur_y = j * m_iMinPicHeight;

        Texture2D newTexture = new Texture2D(m_iMinPicWidth, m_iMinPicHeight);

        for (int m = cur_y; m < cur_y + m_iMinPicHeight; ++m)
        {
            for (int n = cur_x; n < cur_x + m_iMinPicWidth; ++n)
            {
                newTexture.SetPixel(n - cur_x, m - cur_y, m_texPlayer.GetPixel(n, m));
            }
        }
        newTexture.Apply();
        m_texPlayers[i, j] = newTexture;
    }

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

下面是帧序列动画，帧序列动画实际上就是将图片按照一定的顺序加载上去，值得注意的是所有的GUI操作一定要放到OnGUI里面。

    void DrawAnimation(Texture[,] tex, Rect rect)
    {
        //绘制当前帧
        GUI.DrawTexture(rect, tex[m_iCurFram, m_iCurAnimation], ScaleMode.StretchToFill, true, 0.0f);
        //计算限制帧的时间
        m_fTime += Time.deltaTime;
        //超过限制帧切换贴图
        if (m_fTime >= 1.0 / m_fFps && m_bStop == false)
        {
            //帧序列切换
            m_iCurFram = ++m_iCurFram % m_iMinPicRowCount;
            //限制帧清空
            m_fTime = 0;
            //超过帧动画总数从第0帧开始
            if (m_iCurFram >= tex.Length)
            {
                m_iCurFram = 0;
            }
        }
    }

using UnityEngine;
using System.Collections;
using System;

public class CTexture : MonoBehaviour
{
    //大图的人
    public Texture2D m_texPlayer;
    //小图的人
    private Texture2D[,] m_texPlayers;
    //当前帧
    private int m_iCurFram;
    //当前动画
    private int m_iCurAnimation;
    //限制帧的时间
    private float m_fTime = 0;

    //小图的宽和高
    public int m_iMinPicWidth = 48;
    public int m_iMinPicHeight = 64;
    //一行有多少个小图
    public int m_iMinPicRowCount = 4;
    //一列有多少个小图
    public int m_iMinPicColumnCount = 4;

    //动画控制
    //暂停
    private bool m_bStop = false;
    //一秒多少帧
    private float m_fFps = 4;

    private string m_sFps = "";

    void Start()
    {
		m_texPlayers = new Texture2D[4, 4];	
		m_iCurAnimation = 0;
        m_sFps = m_fFps.ToString();
		//加载图片资源
		LoadTexture();

        for (int i = 0; i < m_iMinPicColumnCount; ++i)
        {
            for (int j = 0; j < m_iMinPicRowCount; ++j)
                DePackTexture(i, j);
        }
    }

    void Update()
    {
        if(Input.GetKeyDown(KeyCode.A))
        {
            m_iCurAnimation = 2;
        }
        if (Input.GetKeyDown(KeyCode.S))
        {
            m_iCurAnimation = 3;
        }
        if (Input.GetKeyDown(KeyCode.W))
        {
            m_iCurAnimation = 0;
        }
        if (Input.GetKeyDown(KeyCode.D))
        {
            m_iCurAnimation = 1;
        }
    }

    void OnGUI()
    {
        DrawAnimation(m_texPlayers, new Rect(100, 100, m_iMinPicWidth, m_iMinPicHeight));
        
        if(GUI.Button(new Rect(200,20,80,50),"开始/暂停"))
        {
            m_bStop = m_bStop == false ? true : false ;
        }

        m_sFps = GUI.TextField(new Rect(200, 80, 80, 40), m_sFps);
        if (GUI.Button(new Rect(200, 150, 50, 40), "应用"))
        {
            m_fFps = float.Parse(m_sFps);
        }
    }
	
	//加载图片资源
	void LoadTexture()
	{
		using (FileStream file = File.Open (Application.dataPath + "/Textures/Player.png", FileMode.Open))
		{
			using (BinaryReader reader = new BinaryReader(file))
			{
				m_texPlayer = new Texture2D (192, 256, TextureFormat.ARGB4444, false);
				texture.LoadImage (reader.ReadBytes((int)file.Length));
			}
		}
	}

    //切图
    void DePackTexture(int i, int j)
    {
        int cur_x = i * m_iMinPicWidth;
        int cur_y = j * m_iMinPicHeight;

        Texture2D newTexture = new Texture2D(m_iMinPicWidth, m_iMinPicHeight);

        for (int m = cur_y; m < cur_y + m_iMinPicHeight; ++m)
        {
            for (int n = cur_x; n < cur_x + m_iMinPicWidth; ++n)
            {
                newTexture.SetPixel(n - cur_x, m - cur_y, m_texPlayer.GetPixel(n, m));
            }
        }
        newTexture.Apply();
        m_texPlayers[i, j] = newTexture;
    }

    void DrawAnimation(Texture[,] tex, Rect rect)
    {
        //绘制当前帧
        GUI.DrawTexture(rect, tex[m_iCurFram, m_iCurAnimation], ScaleMode.StretchToFill, true, 0.0f);
        //计算限制帧的时间
        m_fTime += Time.deltaTime;
        //超过限制帧切换贴图
        if (m_fTime >= 1.0 / m_fFps && m_bStop == false)
        {
            //帧序列切换
            m_iCurFram = ++m_iCurFram % 4;
            //限制帧清空
            m_fTime = 0;
            //超过帧动画总数从第0帧开始
            if (m_iCurFram >= tex.Length)
            {
                m_iCurFram = 0;
            }
        }
    }
}

【跟我一起学Unity3D】代码中切割图片并且加载帧序列动画

标签：unity3d   序列帧   切图   

原文地址：http://blog.csdn.net/nxshow/article/details/40554391