Android圖片處理基礎方式

位圖副本的操作步驟

1. 得到原始圖片的對象
   * Bitmap srcBitmap = BitmapFactory.decodeFile(“/mnt/sdcard/tu1.jpg”);

2. 創建圖片對象的副本(空白副本)
   *Bitmap copyedBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), srcBitmap.getConfig());

3. 創建畫板對象
   *Canvas canvas = new Canvas(copyedBitmap);

4. 創建畫筆
   *Paint paint = new Paint();
   *paint.setColor(Color.BLACK);

5. 作畫

   • canvas.drawBitmap(srcBitmap, matrix, paint);
   • // matrix : 位圖矩陣對象,用來對圖片精選縮放平移等效果的

   縮放

   Matrix matrix = new Matrix();
   matrix.setScale(0.6f, 0.6f);//縮放比例

   平移

   Matrix matrix = new Matrix();
   matrix.settranslate(100,100);//平移距離

   旋轉

   Matrix matrix = new Matrix();
   matrix.setRotate(180,srcBitmap.getWidth()/2, srcBitmap.getHeight()/2);/角度和中心點

   鏡面特效

   Matrix matrix = new Matrix();
   matrix.setScale(-1, 1);
   matrix.postTranslate(srcBitmap.getWidth(), 0);

   倒影特效

   Matrix matrix = new Matrix();
   matrix.setScale(1, -1);
   matrix.postTranslate(0, srcBitmap.getHeight());