CS106A assignment2 --problem5 BoxesIllusion

/* TODO: Replace these file comments with a description of what your program
 * does.
 */
import acm.program.*;
import acm.graphics.*;

public class BoxesIllusion extends GraphicsProgram {
    /* The number of rows and columns in the grid, respectively. */
    private static final int NUM_ROWS = 5;
    private static final int NUM_COLS = 6;
    
    /* The width and height of each box. */
    private static final double BOX_SIZE = 40;
    
    /* The horizontal and vertical spacing between the boxes. */
    private static final double BOX_SPACING = 10;
    
    /* The default width and height of the window. These constants will tell Java to
     * create a window whose size is *approximately* given by these dimensions. You should
     * not directly use these constants in your program; instead, use getWidth() and
     * getHeight().
     */
    public static final int APPLICATION_WIDTH = 350;
    public static final int APPLICATION_HEIGHT = 300;

    /*
     * BLANK_WIDTH represents the space of the most left to the first raw;
     * BLANK_HEIGHT represents the space of the highest to the first line;
     */
    public static final int BLANK_WIDTH = 30;
    public static final int BLANK_HEIGHT = 20;
    public void run() {
        /*
         * use a double loop to create the boxes illusion 
         */
        for(int i=0;i < NUM_ROWS ;i++){
            for(int j=0;j