question: private static float [ ] randomPoints ( Random random , int wavesCount , float width , float shiftCoef ) { float shift ; float [ ] points = new float [ wavesCount + 1 ] ; for ( int i = 0 ; i < points . length ; i ++ ) { if ( i == 0 ) { points [ i ] = - 1 ; } else if ( i == points . length - 1 ) { points [ i ] = 1 ; } else { shift = random . nextFloat ( ) * shiftCoef * width ; shift *= random . nextBoolean ( ) ? 1 : - 1 ; points [ i ] = - 1 + i * width + shift ; } } return points ; }
target:  Generate random points for wave.