Java Extra Credit assignments


1.  Take any of the BallBox applets.
     Replace the calls to fillOval with a call to fillTriangle that you will write.
     Write a fillTriangle() method.  It should have the signature

     private void fillTriangle(int x, int y, int side) 

     where x and y are the position of the lower left point, and side is
     the length of the one of its sides in pixels.   

     Draw a right triangle by drawing a bunch of lines one
     pixel apart.
     Use a for loop.
     The longest line is at the bottom, the top line is one pixel.
     Each line should be one smaller than the one above it.

2.  Draw a chessboard with filled black and red squares.
     If you use your old chessboard applet, then gut the paint routine (take out
       the insides)
    
     First draw one square. I suggest 15 pixels on a side.
     Use fillRect.

     Now draw a row of 8 squares, with alternating colors.
     You will need a for loop, and move each square over (in x direction)
     by 15 pixels.

     Use an if statement to set what color to draw.

     Here is a routine that you can use to help decide what color to draw.
     
     private boolean isOdd(int num) {
             return (num % 2) == 1;
     }

     This will return true if num is odd and false if num is even.

     Now use a for loop to draw 8 rows.  Each new row needs to be
     moved down (y direction) by 15 pixels.