@Override
public void onDraw(Canvas canvas)
{
    int startX, startY, stopX, stopY;
    startY = stopY = 100;
    startX = 100;
    stopX = 200;
    this.paint = new Paint();
    //this.path = new Path();
    this.matrix = canvas.getMatrix();
    this.paint.setColor(Color.BLUE);
    this.paint.setStrokeWidth(4);

    this.matrix.setRotate(180, startX, startY);
    canvas.concat(this.matrix);
    /*this.matrix.setTranslate(startX, 0);
    canvas.concat(this.matrix);*/

    canvas.drawLine(startX, startY, stopX, stopY, this.paint);

    canvas.setMatrix(new Matrix());
    //canvas.drawCircle(200, 200, 50, paint);
}

this.matrix.setRotate(180, startX, startY);
canvas.save();
canvas.concat(this.matrix);
canvas.drawLine(startX, startY, stopX, stopY, this.paint);
canvas.restore();

Matrix m = new Matrix();       //Declaring a new matrix
    float[] vecs = {7, 3};    //Declaring an end-point of the line

   /*Declaring the initial values of the matrix
     according to the theory of the 3
     dimensional chicken in 2D space
    There is also 4D chicken in 3D space*/

    float[] initial = {1, 0, 0, 0, 1, 0, 0, 0, 1};
    m.setValues(initial);
    float[] tmp = new float[9];    //Debug array of floats
    m.setRotate(90, 4.0f, 3.0f);    //Rotating by 90 degrees around the (4, 3) point
/*Mapping our vector to the matrix.
  Similar to the multiplication of two
  matrices 3x3 by 1x3.
  In our case they are (matrix m after rotating) multiplied by
  (7)
  (3)
  (1) according to the theory*/

  m.mapPoints(vecs);

    for(float n : vecs)
    {
        Log.d("VECS", "" + n);     //Some debug info
    }

    m.getValues(tmp);
    for(float n : tmp)
    {
        Log.d("TMP", "" + n);      //also debug info
    }