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Well done!
You have completed C# Objects!
You have completed C# Objects!
Preview
The game is finished. Let's make a level and play it.
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Now let's make a level and play the game.
0:00
This is where we'll go
back to the main method.
0:02
In most real life games,data about
each level would be stored in a file.
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When the player chooses to play a level,
it would read from the file, and
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the map, path, invader, and level objects
would be created using that data.
0:13
For the time, being instead of
reading this information from a file,
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we'll create the level
object right here in main.
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We already have a map and
a path created so let's keep those.
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We'll need to create an array of invaders.
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We'll have four in this level.
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So I'll say invader,
array, call it invader,
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call invaders, then create
a new Invader pass of the path,
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and then I'll copy this three more times.
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We'll construct a level called Level1 and
pass in the invaders.
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Again, in real life players would pick
where to place towers by clicking
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on the map.
1:06
Our game doesn't have a graphical
element to it yet, so we can't do that.
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Instead, we could use the console to let
players select where to place towers.
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If you like,
you can code this up yourself.
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If you've taken the prerequisites for
this course,
1:20
then you've already learned everything
you need to know, in order to do that.
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For now, we'll create and assign the
towers their locations directly in code,
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and then pass them to the level object.
1:30
I encourage you to make improvements to
the tree house defense game on your own,
1:33
as you see fit.
1:36
It's very good practice, and
you'll understand even more about why
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object-oriented programming makes
changing and extending existing code so
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straightforward.
1:45
Let's create an array of towers here.
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So, let me create a new tower in
the array and give it a MapLocation.
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Right now,
our towers only have a range of one, so
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we'll need to place them
right beside the path.
2:04
The path is on row two of the map so
let's place them on row three.
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So I'll out the first one at 1, 3.
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Then I'll just copy this, paste it
a couple times, and change the x value.
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I'll put the 2nd one on x equals 3,
and the 3rd one at x equals 5.
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Now we can set the tower
property on the level.
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We can set this property like so.
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Another way you'll see properties being
set on the objects is in a property
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initialization list.
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This is handy, when you want
to set a property on an object
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immediately after the object is created.
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To do, that you just add some
curly braces right here.
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Now I can just say towers = towers.
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And, don't need this line.
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You can only do this at the time
the object is being constructed.
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This only works with properties.
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If we had other properties, we could list
them here, and separate them by commas.
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Also, there's no need for
a semi-colon here.
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Now we can call play.
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Play returns true, if the player won.
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So, we'll store that in a boolean
variable called playerWon.
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Finally, let's print the game's
outcome to the screen.
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We could write an if else statement,
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to print two different messages to the
screen, depending on if the player won.
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Or, by using the ternary if operator, we
can do it all in the single line like so.
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So Console.WriteLine first
will say player space
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then will concatenate whether
the player won or lost.
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So use the ternary if operator here.
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We'll put it all in some parentheses.
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So say if playerWon,
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then we'll have it say won,
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make that a lowercase w,
else will have it say lost.
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When the program runs
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the level will be created in
the play method will be executed.
4:20
The invaders will start
marching down the path, and
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as they get close to the towers,
the towers will shoot at them.
4:27
When the play method returns, we'll know
if we placed enough towers at the right
4:31
places on the map, to stop the invaders
from getting to the end of the path.
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Let's try it out.
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First we'll need to compile and
run the game.
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So at the end of our compile statement,
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I'll type && mono TreehouseDefense.exe.
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All right we won!
4:55
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