/** * Draws concentric circles around the current aircraft position showing distance. author: rwalker * * @param canvas upon which to draw the circles */ private void drawDistanceRings(Canvas canvas) { /* * Some pre-conditions that would prevent us from drawing anything */ if (null != mPointProjection) { return; } // Tell the rings to draw themselves mService .getDistanceRings() .draw(canvas, mOrigin, mScale, mMovement, mPref.isTrackUp(), mGpsParams); }