C++ Allegro 5 Made Easy Tutorial 38 - Joysticks and Controllers Video Lecture | Allegro: A Complete Guide - Game Development

hello everybody and welcome to your 38th
Allegro 5 tutorial and this tutorial
we're going to be learning about
joysticks and controllers okay so
whatever using controllers or joysticks
running the external device used for
movement or whatever in our game it is
representing represented by a joystick
in Allegro okay so what we want to do
first of all before we even use a
joystick we need to install the joystick
okay so a island-style joystick and if
you're wondering about we're just coal
is taken from my steam alas the previous
tutorial okay so all to to be honest we
don't need to or me let me create a
joystick let most of the keyboard we
don't have to make an on instance of the
keyboard so let's get rid of this code
right here and now so first I'm going to
be showing you how to handle joystick
events and then we're gonna get into how
to do like our real-time joystick input
okay so first of all oh there's there's
different this for different event types
for that row there's a leg row event
joystick button down button up axis and
configuration okay so button down is
obvious if they press up and down or
whatever detects that if they press one
and they release it then that's for
button up
so first of all I included the iostream
at the top the program including the
iostream and what we're gonna do is
we're going to use that to display to
our console window or where our choice
is set up now I'm for my joystick I'm
using my ps3 controller now if you have
a ps3 or xbox 360 controller then you
can download something called motion joy
and with motion joy you'll be able to
configure your controller to make it con
like a gamepad and you can set it for
different things you can make it a mouse
button whatever bar set to gamepad and I
said the different gamepad buttons and
stuff I want right
so if I press this right here and I read
this program
oh there's something I forgot to erase
hopefully that's it
nope okay I got it over to this code
right here okay so let's try this one
last time okay so don't worry about the
map right here focus on the console
window right here okay so I'm when I
press a different button button we see
the the button now you press the number
button now we press so for example when
I press the X button I see the number
two when I approach the triangle when I
see the number zero and accept cetera
but notice that when I press a triangle
button it's set to button one right but
think of these as like one when are you
putting a button they're stored in an
array
okay so button 1 is indeed in the array
index zero so when we press button one
where the identity of that is zero and
that's gonna be important when we get
into real time input with this stuff
okay so let me close this down and let
me close the game window okay so we got
that we know how to detect button
presses and it's good that we know how
to detect by impressions for example say
you have a option screen where they can
change the configuration of their
buttons or whatever for your game to say
you want them to if they want to change
the movement or can change the
controller output then you could detect
what button they press and then change
it to change the new button that you're
detecting for input to that new button
they inputted anyways so now we're just
going to be checking for access
employment and I said okay before the
SUV see all I said event access position
the reason being is that
for Oh where's the program I had open oh
I don't know where I put it
okay so anyways I put it for that
emotion joy that I set it so that the X
and y-axis axes right here so this is X
positive and this is X negative so that
access my I think is represented by the
number 0 so if we if we print out events
our joystick axis whenever we press the
left or right button we're gonna get one
number and if we press the up or down
button we're gonna get next number but
you want to distinguish them distinguish
them differently okay so that's what we
do joystick position so if we go if I go
into motion joy right now I see that
this is alright as positive left is
negative and down is positive and up is
negative okay you just configure it
around any way you want so if I go right
here in my program we need to see the
screen okay so when I press the right
button we get a positive number right
and when I let go the number is zero
meaning that do at the station and
nothing is being pressed
whenever the left part and I get a
negative number because it's an X
negative so we know it's a negative
number and then when I press the UP
button we get a negative number and when
I press the down button we get a
positive number
okay so then in your game for example if
you want to if you were detecting a
certain axis you could say like let me
change the axis right now just to show
you something so the Machine 2 axis and
we run the program
so when I press when I press down or up
I get one and when I first left to right
I get zero so if you're running a game
or whatever and you want to take the
tech left and right movement you could
say if access is equal to zero and
position is equal to the petitioners
less than zero therefore you know the
moving left and you save access is equal
to zero and position is greater than
zero then you know the moving right etc
etc okay so now we learn how to detect
access input so now it's time to get
into some some real time input okay
so if we go to what we need to do is we
need to create a joystick right I like a
little joystick and being a pointer and
we do a loose tic and just like a raised
they go from zero cetera et cetera so
since I only have one joystick I said
the joystick I did is zero okay and we
create a joystick state and I forgot to
mention just for like the joysticks
don't forget to register the event
source yeah but that sure you guys
should know that so what I'm gonna print
out here to the screen is the number of
buttons that the joystick has and this
is just a number of joysticks we
currently have and that should that's
that values one okay so just with just
like with a real-time keyboard state
need to get the joystick state all we
put the joystick in there and then we we
store the current drastic state in the
and the joystick variable so this is
sort of different than the the gate key
state the keyboard getting the keyboard
key state when we get a keyboard key
state all we store is the the value into
this key element is key state what what
I'll get Joystiq State does is that it
stores it contacts a snapshot from that
joystick and puts it into this since
there's different joysticks and stuff
like that you
only gonna use one keyboard in the game
but you can use multiple you can use
multiple choice in the game right so
that's what you have to specify which
joystick ID you're trying to get from
and then it's during that snapshot into
the joy into our entire joystick state
so what we're gonna do is that we say
that if events that that equals to the
timer what we're gonna do is we're gonna
say if joy state dot button that button
1 then we we're gonna redraw the map
okay we're gonna do the same thing as we
did the last tutorial so what is button
1 well remember as I was saying that
this door does an array so if we go
right here button 1 is going to be in
the array are 0 and button 2 is gonna be
in the array in the array 1 so when I
press the circle key when I change the
map it's gonna reload the map on the
right person circle key so just to show
you guys so you guys don't think I'm
lying
so we have our map file right here and
I'm going to go and change where's Matt
far okay I'm gonna go and change the map
a bit okay so I change the map let's go
back to our program
so now I am pressing a whole bunch of
buttons I don't know if you can hear me
pressing buttons there's a whole bunch
of ones on my controller when I click
circle we see the map change okay so
that's how you can get real-time input
with your with your buttons okay so as
for we learn about we know about buttons
so as for the axes if we do that we see
you see a stick and for those of you
don't know what the stick is basically
it's kind of like which acts kind of
like which analog stick you're using
right so I don't know Foley I don't know
like to the fullest extent on how it's
used but basically I noticed that when I
set this to like this this the regular
direction and I said
is to like our X or whatever blah blah
blah so if I said it's our x+ or
whatever so this will like this will
signify the right stick and this also is
signified the first stick right so for
example so what I mean do I say it stick
0 and then after when we do that we see
an axis so I believe zeroes of the x
axis 1 is the y axis and I believe that
2 would be the z axis so we want to
check for the if you want to check for
the left axis instead of doing this
stuff we're going to draw to the screen
to see what we get so we're going to say
joy state dot stick x is 0 and end the
line so let me run this program so if I
press right on the analog or left an
analog or yeah any of if I press it
right on the d-pad or left on the d-pad
we get a value and I first read on the
I'm along you get one first left you get
a negative number if I press up I don't
know why I'm getting all those numbers
when I press up when I push down maybe
cuz not perfectly down yeah but when I
do it down like mine do it towards the
right side I get towards one value and
say when I move left I get a negative
value right
so that is for left and right and if I
was to set the axes 2 to 1 then it would
check for the Y value so check for up
and down up and down so check for both
of them
ok so yeah we could do that and if you
want to check for the right stick I said
that to one I don't check for the left
and right so I don't know what's working
for the left analog I don't know what's
going on or maybe because I kind of
messed up with I messed with this a bit
not really sure what I did but just to
have this function
ally with the analogues and stuff I
would just set the stick to zero and
have the x-axis is zero and the y axis
for one and then if you're using the z
axis and you use the three for the CIS
to for this y axis
well that's it for this tutorial hope
you enjoyed it thanks for watching and
bye