[Unity 3D] 白板功能(切換筆色,清除和恢復筆畫)和擷取螢幕畫面

結果呈現如下:

SCREEN SHOT : Unity 3D目前螢幕擷取方式有兩種

第一種 : 

使用Unity 3D現成的Application.CaptureScreenshot("pic.png")函式來完成螢幕畫面的擷取，圖片儲存路徑預設為Application.persistentDataPath

第二種 :

使用ReadPixel的方式來完成螢幕畫面的擷取，程式碼如下：

public Camera mainCamera;
IEnumerator ScreenCapture() {
     //在擷取畫面之前請等到所有的Camera都Render完
     yield return new WaitForEndOfFrame();
     Texture2D texture = new Texture2D((int)mainCamera.pixelWidth, (int)mainCamera.pixelHeight);
     //擷取全部畫面的資訊
     texture.ReadPixels(new Rect(0, 0, (int)mainCamera.pixelWidth, (int)mainCamera.pixelHeight),0,0, false);
     texture.Apply();
}

螢幕擷取後，儲存圖片：

void SaveTextureToFile(Texture2D texture, string fileName) {
     byte[] bytes = texture.EncodeToPNG();
     string filePath = Application.dataPath + "/" + fileName + ".png";
     using (FileStream fs = File.Open(filePath, FileMode.Create)) {
          BinaryWriter binary = new BinaryWriter(fs);
          binary.Write(bytes);
     }
}

程式碼參考自 -> http://www.iverv.com/2014/04/unityscreenshot.html

範例檔下載https://drive.google.com/file/d/0B3H9vBZjIBruT1pwd3Z0TGQ4R28/view?usp=sharing

螢幕畫面擷取後儲存的路徑分類:

Application.dataPath

建議視窗開發中用的路徑：

windows:  /Assets

IPone: Application/???/Name.app/Data

Android: /data/app/Name.apk

Application.persistentDataPath

Contains the path to a persistent data directory (Read Only).

平台中的公開目錄，文件持久性的保存不會因為應用程式更新或升級而刪除

windows:  C:/Users/xxxx/AppData/LocalLow/CompanyName/ProductName

IPone: Application/???/Documents

Android: /data/data/Name/files

Application.streamingAssetsPath

專案目錄下面的 Assets/StreamingAssets

windows:   /Assets/StreamingAssets

IPone: Application/???/Name.app/Data/Raw

Android: jar:file:///data/app/Name.apk/!/assets

Application.temporaryCachePath

Contains the path to a temporary data / cache directory (Read Only).

平台的快取儲存路徑

windows: C:/Users/xxxx/AppData/Local/Temp/CompanyName/ProductName

IPone: Application/???/Library/Caches

Android:  /data/data/Name/cache