补间可以实现两个图形之间颜色、形状、大小、位置等的线性变化。
例如A...AB...BC...C，其中A、B、C是三幅图片，两个A的宽分别是10cm和50cm，两个A之间共5帧，那么使用补间操作后，A图片的宽分别是10cm、20cm、30cm、40cm、50cm，B和C图片的宽度计算同理。对于A...ABC...C或者A...ABBC...C这种情况，B不进行补间操作。
下面新建一个控制台处理程序，添加图片类ImageClass.cs。
public class ImageClass
{
//宽
public int Width { get; set; }
//高
public int Height { get; set; }
//模拟判断是否是同一张图片
public string Path { get; set; }
public ImageClass(int _width,int _height,string _path)
{
Width = _width;
Height = _height;
Path = _path;
}
}新建图片帧类ImgFrameClass.cs。
public class ImgFrameClass
{
public ImageClass FramesImg { get; set; }
public int Frames { get; set; }//图片位于的帧数
public ImgFrameClass(ImageClass _frameImg, int _frames)
{
FramesImg = _frameImg;
Frames = _frames;
}
}新建补间算法类，需要引用Newtonsoft.Json。
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace TweenDemo
{
public class Utility
{
public static List<ImgFrameClass> SetTween(List<ImgFrameClass> _imgFrameList)
{
List<ImgFrameClass> imgFrameResultList = new List<ImgFrameClass>();
List <ImgFrameClass> imgFrameList = DeepCopyWithSerialization(_imgFrameList);
//定义两个游标,初始化为相邻游标
int b = 0, a = 1;
int len = imgFrameList.Count;
//存在相同元素的个数
int count = 0;
string samePath = string.Empty;
while (a < len)
{
ImgFrameClass itemb = imgFrameList[b];
ImgFrameClass itema = imgFrameList[a];
while (b >= 0 && a < len && (imgFrameList[b].FramesImg.Path == imgFrameList[a].FramesImg.Path))
{
samePath = imgFrameList[b].FramesImg.Path;
while (a < len && (imgFrameList[a].FramesImg.Path == samePath))
{
a++;
}
count = count + 2;
}
if (count != 0)
{
ImgFrameClass tweenStartItem = imgFrameList[b];
ImgFrameClass tweenStopItem = imgFrameList[a - 1];
//添加初始图片
imgFrameResultList.Add(tweenStartItem);
ImageClass tweenStartImg = DeepCopyWithSerialization(tweenStartItem.FramesImg);
ImageClass tweenStopImg = DeepCopyWithSerialization(tweenStopItem.FramesImg);
double tweenFrame = tweenStopItem.Frames - tweenStartItem.Frames;
double tweenImgW = (double)(tweenStopImg.Width - tweenStartImg.Width) / tweenFrame;
double tweenImgH = (double)(tweenStopImg.Height - tweenStartImg.Height) / tweenFrame;
int coutStart = tweenStartItem.Frames;
int coutStop = tweenStopItem.Frames;
//插入补间图片
for (int i = coutStart + 1; i < coutStop; i++)
{
ImageClass tweenAddImg = new ImageClass((int)(tweenStartImg.Width + tweenImgW * (i - coutStart)), (int)(tweenStartImg.Height + tweenImgH * (i - coutStart)),samePath);
imgFrameResultList.Add(new ImgFrameClass(tweenAddImg,i));
}
//添加末尾图片
imgFrameResultList.Add(tweenStopItem);
}
else
{
imgFrameResultList.Add(imgFrameList[b]);
}
//不满足则正常移动游标，都向前移动一个，相同元素的个数置0
b = a++;
count = 0;
}
return imgFrameResultList;
}
public static T DeepCopyWithSerialization<T>(T obj)
{
string json = JsonConvert.SerializeObject(obj);
T copy = JsonConvert.DeserializeObject<T>(json);
return copy;
}
}
}模拟生成AAAAABBBBCBB结构的数据，Main函数如下：
static void Main(string[] args)
{
//模拟生成测试数据
List<ImgFrameClass> imgFrameList = new List<ImgFrameClass>();
imgFrameList.Add(new ImgFrameClass(new ImageClass(10, 10, "A"),1));
imgFrameList.Add(new ImgFrameClass(new ImageClass(50, 50, "A"), 5));
imgFrameList.Add(new ImgFrameClass(new ImageClass(10, 10, "B"), 6));
imgFrameList.Add(new ImgFrameClass(new ImageClass(80, 80, "B"), 9));
imgFrameList.Add(new ImgFrameClass(new ImageClass(10, 10, "C"), 10));
imgFrameList.Add(new ImgFrameClass(new ImageClass(10, 10, "B"), 11));
imgFrameList.Add(new ImgFrameClass(new ImageClass(30, 30, "B"), 12));
List<ImgFrameClass> imgFrameResultList = Utility.SetTween(imgFrameList);
foreach (ImgFrameClass item in imgFrameResultList)
{
Console.WriteLine(string.Format("Img{0},width:{1},height:{2}", item.FramesImg.Path, item.FramesImg.Width, item.FramesImg.Height));
}
Console.ReadLine();
}运行结果：
