You are going to screenshot all of your work into a Powerpoint file.

To download the PowerPoint by clicking on the image below

To save your powerpoint go to:

File explorer

-> Year 9 Common Area :S

-> You can save here

-> Computer Science

-> Term 3

-> Lesson 3

Save the Powerpoint file: as your name

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Complete Task 1 in your Powerpoint

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Events in pygame:

All games have interaction with the user, in computing these are known as Interrupt Events.

The code that checks if the user has done something is called an Event Listener.

When a specific event is heard by the Event Listener, an action is then performed by the Event Handler code.

If we look carefully at the template you will see that the event of the user closing the window is already handled. We'll add some more event handlers in this lesson, to make our game more interactive.

Task 1

Add the print(event) statement to your code:

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Run your code, then move the mouse around inside the pyGame window and press some keys on the keyboard.

Look in the shell/interpreter window, located in the bottom section of the Thonny window or in the terminal window for Python IDLE.

You might see output like this:

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Try holding the CTRL, ALT or SHIFT keys while pushing other keys. The interpreter window output will now change slightly to show that the keys have been modified.

KeyUp and KeyDown are different events. What's the difference?

Task 2

Look at the example below then copy and paste the lines from the Thonny/Python console in the bottom window which show the events returned for each of the following:

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Example:

Right mouse button clicked/released

<Event(1025-MouseButtonDown {'pos': (113, 439), 'button': 3, 'window': None})>

<Event(1026-MouseButtonUp {'pos': (113, 439), 'button': 3, 'window': None})>

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1. Left mouse button pressed/released
2. W key pressed
3. Up arrow pressed

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When you are finished screenshot your working code into your Learning Journal

Lets first make our square we are going to move around we will do this using variables for all its values.

Add this line of code to your program under ## your code starts here

screen.fill(black)
pygame.draw.rect(screen, green, (XPos, YPos, squareWidth, SquareHeight))

Now lets put in the values for the variables for our square

XPos = 100
YPos = 100
Speed = 5
squareWidth = 20
SquareHeight = 20

Run your code to make sure it works

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Key Moves

In order for us to check if a key has been pressed we need to first look for a KEY DOWN event.

Activity

Add this line of code to your program under ## your code starts here

Now press your left arrow key and see what happens

Extension Task

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Add some more if statements to your code so that you can move your square up down and right using the key codes pygame.K_RIGHT, pygame.K_UP, pygame.K_DOWN

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When you are finished screenshot your working code into your Learning Journal

Finding the edges of the screen

Just like last week When our square gets to the edge of our screen it disappears.

We want the whole square to stay on the screen To do that we need to check the two different x-cordinates at either side of the screen.

Task

1. Set the value of Xpos or Ypos so that our square does not move whenever it gets to to the edge of the screen

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2. Can you to take into account the width of our square to keep the whole square on our screen when it is at the SCREENWIDTH and SCREENHEIGHT values

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3. When you are finished screenshot your working code into your Learning Journal

Changing speed

Can we change the value of Speed by using a key press?

Task

1. Change the value of Speed by - 1 whenever we press the a key pygame.K_a
2. Change the value of squareSpeed back to a positive number whenever another key of your choice is pressed.

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When you are finished screenshot your working code into your Learning Journal