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Hi, welcome back.

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In this lecture, we will complete our game and adding a bouncing poll arcade game like Pong Game are

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based on a frame based animation where the screen is refreshed every specific milliseconds and moving

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sprites are doing by using X and Y coordinates or axis.

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And they have a variety vector V, X and VI, which is specified the Delta and vectors to apply to X

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and Y coordinates or position or axis of as between two friends.

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So to move the Sprite across the game, display or screen, it will need to bounce against a Sprite

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or against the edge of the screen or the game play.

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So we will copy the code and the battle module and it in a new file.

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And name it as bull, but by then it that last name from bottle to glass bowl with the capital and we

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will add after the line of code that draws correct.

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Mesud.

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Self-taught velocity equals.

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A list of rendang between two parenthesis rendang, four and eight, and Ron it.

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Minus eight and a close saw, self-taught, wealthy, when Ekwall, a list of two ran, then it off

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to table four and eight or minus eight and a so Zahran then, which is part of a random module, will

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it chose between four and a four varity Hendrick's zero or minus eight and a four velvety index one.

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So we will add this in bold statement from random and bold rond in it.

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Now we will add a function that will upgrade the ball.

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Velocity has the following and it will take one parameter which is self.

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So def update between two parentheses self column.

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And inside this function, we will add self-doubt, recht dot x.

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Plus, equal self-doubt, first index zero.

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And for the movement or the validity of the bowl ads, the X, Y or the Y position will be as the following

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self-taught Recht not Y plus equal self-doubt versity between two square brackets, one and X number

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one, OK.

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Finally, we want to add a function to Zabol class that will make our ball bounce.

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And we'll take also self as the only parameter, so Jeff Ball underscored bouncing between two parentheses

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self column and inside this function we will add self-doubt.

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Where's the index number zero equal minus self see?

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And zero and self-taught versity.

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Between two square brackets, one equal self-doubt versity.

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And that's number one, then we will add the ball to the game that by five and the following using the

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object of class, so we will import the class pool as a falling from pole balls ball with B capital.

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Then we will add the ball to the ball boy as a foul ball will equal the ball class opposite ball ekwall

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ball with capital B between two parentheses Y and Tony and Tony.

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This will be the colour and width and the height of the ball rectangle, so ball, dot, dot, x equals

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four hundred and ball the dot Y equals two hundred.

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Now we will add the sprite of our ball and the following.

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So sprites underscored last dot at between two parentheses ball.

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Now we will add the ball bouncing algorithm which will control the two methods of the ball class.

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But first we will add an after statement which contain event type or another, even the type.

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Has the following F even type equal by game dot K down column and inside this F statement, we will

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add another nested F statement as the following f even Doti will equal by game the K capital under score

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x small column.

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So game underscore on equal falls.

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Now we can add the ball bouncing algorithm at the following after as bright as update method f statement

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ball dot dot x more than or equal seven hundred add column for ball dot t of index zero equal minus

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ball.

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That was the.

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Of Index zero.

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So Zabol that wrecked that X.

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If equal or more than seven.

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Hundred and eighty bexell.

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The validity of index zero will equal mine as well as the.

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Of Index zero, Zabol will move in another or the opposite position and we will return the X and Y position

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of the ball as the following Zabol Lautrec but to be equal 400 and the ball to attract the Y to be two

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hundred.

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Zabol will return to the position that it was in at the beginning of the game.

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And we will copy this statement for time.

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OK?

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But we change in the second time that the ball got wrecked, that X less than or equal to then add the

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column and we will let the rest of the F statement as it is.

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Then adding that's her statement as the following involved dot, red dot, why more than five hundred

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and eighty so self dot Melasti.

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But in here, we will change the index to be.

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One.

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Then we will add.

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Another statement, which is a false statement, if both dot dot, why more than not more than less

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than zero collomb.

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So the dot was the one equal minus the the one.

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And we can change zero to be do.

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And check the identity of our good.

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And add the fifth statement as a following, if I gave that Sprite Dot Cleide underscore must.

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Missile and inside this missile, we will add two parameters, which are bold, bright and better.

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One is bright.

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Or.

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By game dot dot Cleide underscore mask.

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Ball and puggle to.

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And at Collomb.

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Then inside the statement, we will add.

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Ball bouncing.

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Method which exist inside.

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Zable class.

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Hold the ball, goodbye.

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Five.

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As you see.

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Now we can build out Rosie to check.

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If our game run correctly or not.

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So let's build our Rosie.

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After building our music, we have an air of.

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As you see.

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So we will.

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Solve this error the following.

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The error due to adding self parameter outside the ball.

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That by five or Polglase.

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So we will add more.

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And instead of self so bold that wealthy, not self, not wealthy, we will change all.

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They're mistaken.

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Or the ad by mistake self-doubt fallacy and change it to Paul Valency.

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And run our project again.

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We will get another error that we have no attributes of pygame called gay.

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Underscore X.

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So we will it sends even the time to even dot gay, which contain by game dot gay, underscore X and

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run our project again and we get another Aros.

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Which as we at gays small, which is incorrect by game dot k capital, underscore X small and run out

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again and get other errors, which is an error in moving up and moving down methods of the battles.

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So we will head over the battle.

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Goodbye file to check this error, which is due to.

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Number of bexell.

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I'm not.

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Assigned to the the threat we by mistake or.

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Commit an error.

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By adding Bexell.

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And instead of number of pics, so we will change it to number of pixels.

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And go to bonke dot, buy and build our product again, it will run.

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Without re importing the Zabol, so this.

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This error is due to we add the position of the ball that wrecked X due time without remembering to

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add X and Y, so we will add X and Y and the ball, the track position.

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To be X equals four hundred and Y equal two hundred.

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Also, we will change the speed of the game or the speed of the ball to be six instead of seven.

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But we have another mistake or error.

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That's all.

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Only.

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Balance and one direction without.

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Making another angle of the reverse direction, this will be solved and the following year will change

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the weight of the middle line, then we will change the method of bouncing self-support velocity of

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an X one equal self-taught velocity and X one and build our Brusic to get the following rhythm.

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And also, will it change the update method as the following to be said would attract dot y plus equals

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self-taught, wealthy and x1 and run our project again.

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And our game will run fine without any errors and with the ball, the correct ball movement.

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And the correct ball bouncing algorithm, as you see, and we need to change some numbers and battle

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Dobi and the weather moving down massive.

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So self the track that way, more than four hundred seventy five column.

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And inside the statement itself, dot, dot y equals four hundred seventy five and bailed out again

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to run our game and it will run correctly without any error.

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And with the correct ball movement and bouncing.

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We can also change these numbers to four hundred and sixty which more appropriate.

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And we will check that by building our project again as the following to run correctly without any error

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and with the most and the best ball movement and bouncing.

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As you see at this moment.

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We reached the end of this lecture.

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We enjoyed this lecture and get all of that.

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Thank you for watching and thank you for being here.

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See you next lecture.