android bit地图对角线旋转和画图

android bitmap对角线旋转和画图
public Bitmap convert(Bitmap mBitmap, int width, int height) {int w = mBitmap.getWidth();int h = mBitmap.getHeight();Bitmap newBitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);Canvas mCanvas = new Canvas(newBitmap);Matrix matrix = new Matrix();matrix.postScale(1, -1);matrix.postRotate(-90);Bitmap mBitmap2 = Bitmap.createBitmap(mBitmap, 0, 0, w, h, matrix, true);mCanvas.drawBitmap(mBitmap2, new Rect(0, 0, mBitmap2.getWidth(), mBitmap2.getHeight()), new Rect(0, 0, width, height), null);return newBitmap;}

? 在Bitmap上画图：

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public Bitmap drawRect(Bitmap bitmap) {Paint paint = new Paint();paint.setColor(Color.RED);paint.setStyle(Style.STROKE);Bitmap newBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);Canvas mCanvas = new Canvas(newBitmap);mCanvas.drawBitmap(bitmap, 0, 0, null);mCanvas.drawRect(0, 0, 20, 20, paint);mCanvas.save(Canvas.ALL_SAVE_FLAG);mCanvas.restore();return newBitmap;}

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