Well, for one thing, this is not right:
canvas.rotate(angle, X + getWidth() >> 1, Y + getHeight() >> 1);
You should be calling getWidth and getHeight on the bitmap.
Something like this:
canvas.rotate(angle, X + resizedBitmap.getWidth()/2, Y +
resizedBitmap.getHeight()/2);
On Tuesday, September 11, 2012 12:54:59 AM UTC-5, HPP wrote:
>
> Hai thanks for the replys........
>
> I changed my code like
>
> matrix.postScale(scaleWidth, scaleHeight);
> matrix.postRotate(angle, X+centrex , Y+centrey );
> canvas.setMatrix(matrix);
>
> Bitmap resizedBitmap = Bitmap.createBitmap(arrow, 0, 0,
> arrow.getWidth(), arrow.getHeight(), matrix, true);
> canvas.save(Canvas.MATRIX_SAVE_FLAG);
> canvas.rotate(angle, *X + *getWidth() >> 1, *Y +* getHeight() >>
> 1);
> super.dispatchDraw(canvas);
> canvas.drawBitmap(resizedBitmap, X, Y, null); //Draw the arrow on
> the rotated canvas.
> canvas.restore();
>
> But still it's not rotating about the centre.......
>
>
>
> On Tuesday, 11 September 2012 01:49:30 UTC+5:30, bob wrote:
>>
>> canvas.save(Canvas.MATRIX_SAVE_FLAG);
>> canvas.rotate(angle, *X + *getWidth() >> 1, *Y +* getHeight() >> 1);
>> super.dispatchDraw(canvas);
>> canvas.restore();
>>
>> On Monday, September 10, 2012 2:22:15 PM UTC-5, lbendlin wrote:
>>>
>>> canvas.save(Canvas.MATRIX_SAVE_FLAG);
>>> canvas.rotate(angle, getWidth() >> 1, getHeight() >> 1);
>>> super.dispatchDraw(canvas);
>>> canvas.restore();
>>>
>>> On Monday, September 10, 2012 9:18:32 AM UTC-4, Haris wrote:
>>>>
>>>> Hai all
>>>>
>>>> I am trying an application like rotating image with motion
>>>> sensor....My problem is that the image does not rotate about centre
>>>> properly....And my angle range is 0 to 90 and 0 to -90..
>>>> And below is my code.....
>>>>
>>>> public void onDraw(Canvas canvas) {
>>>> super.onDraw(canvas);
>>>> Bitmap arrow =
>>>> BitmapFactory.decodeResource(getResources(),R.drawable.arrow);
>>>> int arrowW = arrow.getWidth();
>>>> int arrowH = arrow.getHeight();
>>>> float scaleWidth = 1;
>>>> float scaleHeight = 1;
>>>> int centrex = arrowW/2;
>>>> int centrey = arrowH/2;
>>>> int X=108;
>>>> int Y=100;
>>>> int angle=0;
>>>>
>>>> Matrix matrix = new Matrix();
>>>> matrix.postScale(scaleWidth, scaleHeight);
>>>>
>>>> matrix.postRotate(angle, X+centrex , Y+centrey );
>>>> Bitmap resizedBitmap = Bitmap.createBitmap(arrow, 0, 0,
>>>> arrow.getWidth(), arrow.getHeight(), matrix, true);
>>>> canvas.save();
>>>> canvas.drawBitmap(resizedBitmap, X, Y, null);
>>>> invalidate();
>>>> }
>>>>
>>>> I am getting the angle values from onCreate method.....Using
>>>> orientation sensor(roll values)..
>>>> But When I rotate the screen my image is rotating but not exactly
>>>> around the image centre.....
>>>>
>>>> Thanks......
>>>>
>>>
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