Help me Assignment 2 pro 1

gistfile1.txt

import java.awt.Color;

public class MovingRectangle {
    
    /**
     * method: showAnimation
     * This method shows an animation in which a rectangle moves around, inside and close to
     * the edges of an open window.
     * Eveytime the rectangle changes the moving direction, its color is changed
     * to the next color in the specified array. If there is no more color in the array,
     * go back to the first color.
     *
     * The method must check for valid parameters, that is:
     * - the rectangle must fit inside the window.
     * - the color array must contain at least 1 color.
     *
     * @param windowHeight: the height of the window
     * @param windowWidth: the width of the window
     * @param recHeight: the height of the rectangle
     * @param recWidth: the width of the rectangle
     * @param colors: the array of Colors
     */
    
    public static void showAnimation(int windowHeight, int windowWidth,
            int recHeight, int recWidth, Color[] colors) {
        
        // 1. Check for valid parameters
        // ------------------------------
        // Write your code here to check for valid parameters
        // if the parameters are not valid, just print out an error message and
        // exit.
        
        
        // 2. Start showing the animation
        // You are supposed to replace the code inside the while loop.
        // The code here is just to show you how to draw and erase a rectagle 
        // by calling method retangle().
        // Please follow the requirements in the assignments to show the animation
        // correctly.
        how to check the parameter ??
       
        while (Mosaic.isOpen()) {
            // Draw the rectangle in color c, pause so the user can see it, then
            // redraw the same rectangle in black, effectively erasing the
            // the colored rectangle.
            for (int i = 1; i<5;i++){Color c = Color[i];} //i try ramdom color by using array but it is not work
          
            // color of the rectangle
            for (int i = 1;i<=300;i=i+10){
            rectangle(0, i, recHeight, recWidth, c);
            Mosaic.delay(50);
            rectangle(0, i, recHeight, recWidth, Color.BLACK);
            Mosaic.delay(50);}
            Color d= Color.BLUE;
            for (int i = 1;i<=290;i=i+10){
            rectangle(i, 290, recHeight, recWidth, d);
            Mosaic.delay(50);
            rectangle(i, 290, recHeight, recWidth, Color.BLACK);
            Mosaic.delay(50);}
            for (int i = 300;i>=0;i=i-10){
            rectangle(290, i, recHeight, recWidth, c);
            Mosaic.delay(50);
            rectangle(290, i, recHeight, recWidth, Color.BLACK);
            Mosaic.delay(50);}
            for (int i = 300;i>=0;i=i-10){
            rectangle(i, 0, recHeight, recWidth, c);
            Mosaic.delay(50);
            rectangle(i, 0, recHeight, recWidth, Color.BLACK);
            Mosaic.delay(50);}
            
            // Now, adjust the parameters to get ready to draw the next rectangle
            // ....
        } // end while()
        
    } // end showAnimation()
    
    
    
    /**
     * Draws the outline of a rectangle in the window by setting
     * the color of each little square on that rectangle;
     * @param top is the starting row of the rectangle
     * @param left is the starting column
     * @param height is the number of rows in the rectangle
     * @param width is the number of columns
     * @param r red component of the color
     * @param g green component of the color
     * @param b blue component of the color
     */
    
    static void rectangle(int top, int left, int height, int width, Color c) {
        
        // Your job is to write the code for this method
        // The code below just colors the corners of the rectangle.
        // You have to draw the whole outline of it.
        
        Mosaic.setColor(top, left, c); // top left corner
        for (int i = 0;i<=8;i++)
        {
            Mosaic.setColor(top,left+i,c);
           
        }
      
        Mosaic.setColor(top, left + width - 1, c); // top right corner  	}
        for (int i = 0;i<=8;i++)
        {
            Mosaic.setColor(top+i,left+width-1,c);
           
        }
        Mosaic.setColor(top + height - 1, left, c); // bottom left corner
        for (int i = 0;i<=8;i++)
        {
            Mosaic.setColor(top + height - 1, left+i, c);
           
        }
       Mosaic.setColor(top + height - 1, left+width-1, c);
       for(int i =0; i<=8;i++){
       Mosaic.setColor(top + height - 1-i, left, c); // bottom right corner
       }
       
    } // end rectangle()
    
} // end class MovingSquare