Apps Rotate ellipse on image when rotate the image in Android

[shakatreh87]

I'm having Android code to move, zooming and rotation image. And it working perfect. Now I want to set ellipse on the image and changing it place upon image changes. The ellipse is drawing perfect in moving and zooming cases, but I don't know how to set new points for the ellipse if I rotate the image.
this is the code I'm using:



@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);

if (!isInitialized) {
int w = getWidth();
int h = getHeight();
position.set(w / 2, h / 2);
isInitialized = true;
}

Paint paint = new Paint();

matrix.reset();
matrix.postTranslate(-width / 2.0f, -height / 2.0f);
matrix.postRotate(getDegreesFromRadians(angle));
matrix.postScale(scale, scale);
matrix.postTranslate(position.getX(), position.getY());

canvas.drawBitmap(bitmap, matrix, paint);

try
{
float x=250;
float y=200;

float[] values = new float[9];
matrix.getValues(values);

x =values[Matrix.MSCALE_X]*x+values[Matrix.MTRANS_X];
y =values[Matrix.MSCALE_Y]*y+values[Matrix.MTRANS_Y];

paint.setColor(0xFF007F00);
canvas.drawCircle(x, y, 15, paint);

}
catch(NullPointerException e) {
// Just being lazy here...
}
}

 

[Unforgiven]

I moved this to the Application Development forum to get some better eyes on it.

 

[DaytonaJohn]

Instead of extracting the elements of the Matrix and doing your own matrix calculations, use the mapPoints() method of the Matrix class (that is what the method is for).