unity实现按住鼠标选取区域截图

本文实例为大家分享了unity按住鼠标选取区域截图的具体代码，供大家参考，具体内容如下

private int capbeginx;
private int capbeginy;
private int capfinishx;
private int capfinishy;
 
public image showimg;
 
// use this for initialization
void start () {
    
  }
  
  // update is called once per frame
  void update () {
    if (input.getmousebuttondown (0)) {
      vector3 mousepos = input.mouseposition;
      vector2 beginpos = new vector2 (mousepos.x, mousepos.y);
      capbeginx = (int)mousepos.x;
      capbeginy = (int)mousepos.y;
    }
 
    if (input.getmousebuttonup (0)) {
      vector3 mousepos = input.mouseposition;
      vector2 finishpos = new vector2 (mousepos.x, mousepos.y);
      capfinishx = (int)mousepos.x;
      capfinishy = (int)mousepos.y;
      //重新计算截取的位置
      int capleftx = (capbeginx < capfinishx) ? capbeginx : capfinishx;
      int caprightx = (capbeginx < capfinishx) ? capfinishx : capbeginx;
      int caplefty = (capbeginy < capfinishy) ? capbeginy : capfinishy;
      int caprighty = (capbeginy < capfinishy) ? capfinishy : capbeginy;
 
      rect rect=new rect(capleftx,caplefty,caprightx,caprighty);
      startcoroutine( captrue (rect));
    }
  }
 
  ienumerator captrue(rect rect){
 
    int t_width = mathf.abs (capfinishx - capbeginx);
    int t_length = mathf.abs (capfinishy - capbeginy);
 
    yield return new waitforendofframe ();
    texture2d t = new texture2d(t_width , t_length,textureformat.rgb24, true);//需要 
     正确设置好图片保存格式 
    t.readpixels(rect, 0, 0, false);//按照设定区域读取像素；注意是以左下角为原点读取 
    t.apply(); 
    byte[] byt = t.encodetopng(); 
    file.writeallbytes(application.datapath + time.time + ".png", byt); 
 
    sprite target = sprite.create (t, new rect(0, 0, t_width, t_length), vector2.zer);
    showimg.sprite = target;
  }

小编为大家分享一段unity实现截屏功能的代码，供大家参考：

public class screenshot : monobehaviour 
{

  void onscreenshotclick()
  {
    //得到当前系统时间
    system.datetime now = system.datetime.now;
    string times = now.tostring();
    //去掉前后空格
    times = times.trim();
    //将斜杠替换成横杠
    times = times.replace("/", "-");

    string filename = "arscreenshot" + times + ".png";
    //判断该平台是否为安卓平台
    if (application.platform == runtimeplatform.android)
    {
      //参数依次为 屏幕宽度 屏幕高度 纹理格式 是否使用映射
      texture2d texture = new texture2d(screen.width, screen.height, textureformat.rgb24, false);
      //读取贴图
      texture.readpixels(new rect(0, 0, screen.width, screen.height), 0, 0);
      //应用截屏
      texture.apply();
      //将对象序列化
      byte[] bytes = texture.encodetopng();
      //设定存储到的手机文件夹路径
      string destination = "/sdcard/dcim/screenshots";
      //如果不存在该文件夹
      if (!directory.exists(destination))
      {
        //创建该文件夹
        directory.createdirectory(destination);
      }
      string pathsave = destination + "/" + filename;
      file.writeallbytes(pathsave, bytes);
    }
  }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。