question: @ Override protected void paintComponent ( Graphics g ) { int fadeX = 0 ; int blankX = getWidth ( ) / 3 ; int bigRectW = getWidth ( ) / 3 ; g . setColor ( largeRectColors [ colorIndex ] ) ; g . fillRect ( 0 , 0 , bigRectW , getHeight ( ) ) ; g . setColor ( Color . WHITE ) ; g . fillRect ( bigRectW , 0 , bigRectW , getHeight ( ) ) ; int bigRectX = 2 * bigRectW ; int smallRectW = 4 ; int smallRectH = 4 ; int smallRectX = bigRectX + ( bigRectW / 2 ) - ( smallRectW / 2 ) ; int smallRectY = ( getHeight ( ) / 2 ) - ( smallRectH / 2 ) ; g . setColor ( Color . BLACK ) ; g . fillRect ( 2 * getWidth ( ) / 3 , 0 , getWidth ( ) / 3 , getHeight ( ) ) ; g . setColor ( smallRectColors [ colorIndex ] ) ; g . fillRect ( smallRectX , smallRectY , smallRectW , smallRectH ) ; }
target:  Displays our component with the animating colors of the areas on the  left and right, separated by an area of white in the middle