Kivy Tutorial #4 - Adding the Ball | Pong Game

In this video we will be adding the ball to our Pong Game

Creating the Pong Ball -

- self: always refer to the current widget
- Size not in ellipse size because when drawing outside it takes the center as reference but when drawing inside canvas it takes left hand side as reference

Steps
1) Create the PongBall class
2) Create the PongBall rule
3) Add the PongBall Widget inside the the PongGame Widget and center it

Moving the ball - Prepare

- NumericProperty - Tell the program that this is a number. Python might need it but if this program is going to run on as a mobile app it needs to know whether is number is an integer or not. Because programming languages like Java are based on it
- ReferenceListProperty - To change or get both of these values at the same time
- Difference between speed and velocity - Velocity also has directions. And to get the direction we need to convert it a vector
- Latest Position = Velocity + Current Position

Next video - Movement Mechanics

#python #kivy #pythongui

[Mayo]

man every indian programming guides shouldve more than 10mil views man, theyve been helping me throughout my college years now thanks alot

[БахтиёржонПашшоев]

Wow that's amazing, it is the best video about Kivy, I can understand everything, even if I don't speak English very good. I wish your videos had a lot views. Keep going. Thank you

[gaviziskind]

Thanks a lot, not really sure why you only have 1.5 views for such a quality video

[prashasthnair]

i am not only learning kivy but also physics :D

[acdundore]

These videos are very informative and well-explained. Thank you so much!

[glintacekuriakose]

" Why am I explaining the joke so much" .. because you are self-conscious XD

[nikolatesla]

Why did you put * before self? What is that for?

[pokeera]

Do self refers to class we are working on?

[AnkitSingh-xcem]

Can we import everything from kivy using single import function?

[knnthrssl]

PLEASE HELP!
When I'm putting the ball to the center, some error happening it said kivy.factory.FactoryExeption: Unknown class <PongBall>

[gelek]

13. # why not self.pos += Vector(*self.velocity) ?
and what does that * mean here?

[TechnoSyke]

How it got its own shape 🙄 ( round in the middle )

[ashutoshtiwary]

It's showing attribute error for the centre_x
Pls help me out

[biuku]

"It's like Inception center..." Hilarious.

[nnx]

can someone say me where is the problem ? i've imported ReferenceListProperty but pycharm says that name 'ReferencelistProperty' is not defined . I know that someone can think that i didn't import protperties, but i did it.

[amrishsandhu]

hey, love your videos! if i may ask, how do u make the rectangles opaque so that the ball/character I create doesn't go through the rectangle u created? I'm trying to create a maze game and would like to incorporate multiple rectangles within to create the maze, and have my character start at the bottom left and reach the exit!

[tarangrover]

Can anyone tell me what stands for root?
why we are using root.width not only width??

[durp]

I might be stupid to ask this, but I am pretty new to this, so Imma ask anyway! He said we are going to import this to android, can we also import it to apple? Or is it only going to be on android?

[dennymmg]

The comment written at 9:18 minutes is pedagogically incorrect. It should have been
# latest position = current velocity * time difference + current position
Of course, it is just a comment. One can ignore it.
In that case, ignore this comment as well.

[adityajha]

you said 11 centers in 36 seconds 3:34 to 4:10