Pipe Fantasy (Part 2)

This is the second part of the Pipe Fantasy project. You will add the "goo"and display the

list of incoming pipes.However,instead of starting the goo-flow automatically,the user will click to propagate the goo after all pipes are placed.This approach will make the

game easier to implement for now.So,the game works as follows:

1 Click to place pipes on tiles (HW 6)

2 When all incoming pipes are exhausted,click to move the goo by one tile (HW 8)

The following example illustrates the goo-flow:

In this example,the goo flows into a Cross pipe from left and flows out to right,and later flows   into    the   Cross    pipe    from   top    and   flows    out   from    bottom.

Before You Start …

Here are a few things to keep in mind before you start working on it:

1 Everything we said about Part 1 still applies!

2 This assignment will ask you to build on top of your solution to Part 1.So,make sure you have a working solution to Part 1 before you start.To help you with this,we will  be hosting a help session for Part 1.

Goo Flow

Important: You should complete and test every part before proceeding to the next part. If you don't,you are very likely to end up with an unfixable program.

In Pipe Fantasy,the goo starts from a starting pipe on the grid.A starting pipe is a pipe

that only has an opening in one direction.Moreover,the player does not place the pipe

with a click:its location is set when the game begins.

Task 1: Modify your data definition for pipe to include starting pipes.

Test your code:all existing check-expects should work.

Task 2: Modify your definition for pipe->image as follows:

;;pipe->image:Pipe    Integer   Integer   Boolean    ->Image

;;Draws   the   given   pipe   on   a   square   tile    with   length   tile-side-length. The    width

;;of   the    pipe   is   pipe-width.Pipe-width    should    be   less    than    tile-side-length.

;;If filled?then draw the pipe with goo.

(define(pipe->image pipe tile-side-length pipe-width filled?)

…)

Make all necessary changes to support starting pipes and the modified pipe->image function.

Test your code:all existing check-expects should work. You should run the game and

verify that it continues to work as before.You have added support for starting pipes and goo,but are not using them.

Task 3: Goo flows through the pipes on the grid,starting from the starting pipe.The starting pipe is considered to have goo from the beginning.The goo continues to

propagate in the direction of the opening until it reaches either:

·An  empty  cell,

·The  boundary  of  the  grid,or

·A pipe that does not have an opening towards the direction of the flow.

Design data called GooFlow that represents the path taken by the goo and the direction in which    it    is    flowing.You    can     modify    existing    data    if    you    wish,but     it    isn't    necessary    to    do

SO.

Test your code:all existing check-expects should work. You should run the game and

verify that it continues to work as before.You have designed GooFlow but are not using it.

Task   4:  Write    a    function    grid-goo-propagate:GooFlow    Grid   ->GooFlow   that    moves   the   goo forward by one tile.If the goo is stuck,produce the same goo.