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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