question: private boolean adjustHue ( int x , int y , boolean check ) { double rad = Math . sqrt ( x * x + y * y ) ; int size = getWheelRadius ( ) ; if ( ! check || ( rad >= size - getWheelWidth ( ) && rad < size ) ) { double angle ; if ( x == 0 ) { if ( y > 0 ) { angle = Math . PI / 2.0 ; } else { angle = Math . PI + Math . PI / 2.0 ; } } else { angle = Math . atan ( ( double ) y / ( double ) x ) ; if ( x < 0 ) { angle += Math . PI ; } else if ( angle < 0 ) { angle += 2 * Math . PI ; } } setFlag ( FLAGS_SETTING_COLOR , true ) ; setHue ( ( float ) ( 1.0 - angle / Math . PI / 2 ) , true ) ; setFlag ( FLAGS_SETTING_COLOR , false ) ; setHueAngle ( angle ) ; setSaturationAndBrightness ( getSaturation ( ) , getBrightness ( ) ) ; return true ; } return false ; }
target:  Adjusts the hue based on the passed in location.