I had a lot of fun putting my bowling game together back when you first
brought this up.
I have a Bowling (Game) class, a Frame class, aThrow class and a Score(ing)
class. I made the Throws a class that I put in an OrderedCollection - but
instVars would work as well... the rest of your game should be oblivious to
your 'underpinnings' anyway.
The Bowling class controls the game and cycles through 10 frames, which I
create then house in an OrderedCollection at the start of the game. Frame
has a subclass called Frame10 that is instantiated for the 10th frame of
the game.
Bowling processes each Frame, starting at 1, from the collection, and does
a runFrame (or whatever action name you want). A Frame consists of throws,
1, 2, or 3 - depending on the frame and the result of the first throw.
A throw returns a random number of 'knocked down pins' between 0 (gutter
ball) and the number of pins remaining in the frame (results of a previous
throw). So my Frame always knows -pinsCleared and -pinsRemaining - but it
asks the Throws what they cleared to calculate that info.
After each throw, the Score class runs through the frames to see if
anything additional can be scored...
- i.e. the first throw on frame3 would be added to the 'spare' of frame2
plus the score of frame 1 - to get the frame 2 score. But frame3 cannot
yet be scored.
Then when the frame does the 2nd throw, (as long as it's not a spare), the
3rd frame can also be scored. Scoring was certainly the most
challenging/fun part for me as there are a number of variables to
consider. Scoring would start at frame1 each time it is called and find
the first frame without a score (the running score is stored on the frame),
a frame can be asked what its score is, but it's kindof irrelevant as this
is not shown on a scorecard, and it can't be done it a vacuum... i.e. if I
have a strike or a spare in a frame, what is the frame score? You have to
get the next two throws to figure that out... so I let the Score class do
that and simply update the Frame score instVar once the calculation has
been made.
As soon as Scoreing hits a frame it cannot score, it stops and the Frame
goes on to the next throw, or if it has hit maxThrows for the frame
(frame1-9, maxThrows=2, frame10 maxThrows=3)... some folks call the third
ball a bonus ball, I decided not to.
So, when you get to frame10, we are allowed to have 3 throws if certain
conditions are met -
- your first throw is a strike, or
- your second throw is a spare
... and of course scoring is a bit different for frame10, as well.
I created a simulator with a traceCr output to show my frames and throws.
Frame 1, 8 pins
Throw 1, 6 pins
Throw 2, 2 pins
Score: 8
Frame 2, 9 pins
Throw 1, 0 pins
Throw 2, 9 pins
Score: 17
Frame 3, 7 pins
Throw 1, 5 pins
Throw 2, 2 pins
Score: 24
Frame 4, 9 pins
Throw 1, 8 pins
Throw 2, 1 pins
Score: 33
Frame 5, 5 pins
Throw 1, 3 pins
Throw 2, 2 pins
Score: 38
Frame 6, 6 pins
Throw 1, 5 pins
Throw 2, 1 pins
Score: 44
Frame 7, 9 pins
Throw 1, 4 pins
Throw 2, 5 pins
Score: 53
Frame 8, 8 pins
Throw 1, 1 pins
Throw 2, 7 pins
Score: 61
Frame 9, 3 pins
Throw 1, 3 pins
Throw 2, 0 pins
Score: 64
Frame 10, 15 pins
Throw 1, 4 pins
Throw 2, 6 pins
Throw 3, 5 pins
Score: 79
Final score: 79
Strikes: 0
Spares: 1
Gutters: 2
Timer >> 24.933ms Bowling-runTestGame
I then tried my hand at a GUI - creating a BowlingPresenter, a
ScorecardPresenter, a FramePresenter and a Frame10Presenter, resulting in...
[image: image.png]
I plan to add multi-player (or at least playing against the computer), but
until I figure out how to make the throws be specific about which physical
pins are remaining and the percentages of the next throw clearing them
(much more complex that pure random) - there's not much else I can really
do. So if anyone has direction for me on this, I'd love to try and tackle
it sometime.
Let me know if you have any questions.
Thanks,
Russ
On Mon, Dec 21, 2020 at 5:05 AM r.wobben--- via Pharo-users <
pharo-users@lists.pharo.org> wrote:
> Hello,
>
>
> To come back at this one.
>
> I made a class Bowling and a class Frame which contains two instance
> variables named firstThrow and secondThrow.
>
>
> but I still wonder how do I know which one to fill in.
>
> I can do ` (firstThrow nil?) ` but that feels not right.
>
>
> Is there a more idiomatic solution for this ?
>
>
> Roelof
>
>
>
--
Russ Whaley
whaley.r...@gmail.com
