Question

我想让我的图像旋转更多时间，我不能在onDraw方法中做到这一点，我的代码是：

           options = new BitmapFactory.Options();
    options.inScaled = false;
    options.inJustDecodeBounds = false;
    options.inDither = false;

    options.inScaled = false;
    options.inPreferredConfig = Bitmap.Config.ARGB_8888;

      public void setAddBmpImage(int rotate) {

    byte[] by = getBitmapByte(rotatedBitmap);
    Bitmap source = BitmapFactory.decodeByteArray(by, 0, by.length, options);

     Bitmap bmpSephia = Bitmap.createBitmap(rotatedBitmap.getWidth(),   rotatedBitmap.getHeight(), Bitmap.Config.ARGB_8888);
     Canvas canvas = new Canvas(bmpSephia);
     canvas.rotate(rotate);
     canvas.drawBitmap(source, 0, 0, null);
     rotatedBitmap= bmpSephia;
     imageStartX = (screenWidth / 2 - rotatedBitmap.getWidth() / 2);
        imageStartY = (screenHeight / 2 - rotatedBitmap.getHeight() / 2);
        invalidate();

}

通过图像旋转得非常好，但图像变形，很难看，能不能告诉我原因，并给我一个好方法，谢谢

Answer 1

尝试使用setAntiAlias(true)

Canvas canvas = new Canvas(bmpSephia);
canvas.rotate(rotate);
Paint paint = new Paint();
paint.setAntiAlias(true);
canvas.drawBitmap(source, 0, 0, paint);

或

BitmapDrawable bmdraw = new BitmapDrawable(bmpSephia);
bmdraw.setAntiAlias(true);
Canvas canvas = new Canvas(bmdraw.getBitmap());
canvas.rotate(rotate);

Answer 2

我使用了@ user7777方法，并修改了Paint paint = new Paint（）; paint.setAntiAlias（真）;然后旋转图像旋转的中心，图像变形变小，我看rotate image in around its center point in canvas

旋转图像，但图像颜色暗淡，图像变形

2 个答案: