G11_C2_For TeacherReference

Variable and Conditional programming

Activity Flow	Slide No.	Topic	Time
TA	5-6	Warm-up Quiz	1 min
	7	Recap	1 min
	8-11	Understanding variables	5 min
	12	Arithmetic operations	3 min
	13-15	TA - Coding (ball movement)	3 min
SA	16-19	SA-coding (ball movement)	4 min
TA	20-24	Decision Making	5 min
	25-27	TA - Coding (ball movement with restriction)	3 min
	28-31	SA - Coding (ball movement with restriction)	5 min
Wrap - Up	32-34	Quiz	2 min
	35	Additional Activity	10 min

Slide No.	Topic
14	TA Code- Ball movement
18	SA Code- Ball movement
26	TA Code- Ball movement with restrictions
30	SA Code- Ball movement with restrictions
37	Additional Activity 1- Code
39	Additional Activity 2- Code

Class Structure

Preparation and Reference

Prerequisites

FOR TEACHER

FOR STUDENTS

1. Computer with an Internet connection.

2. The latest browser installed.

3. Spyder IDE.

4. Projector to present the screen

1. Computer with an Internet connection.

2. The latest browser installed.

(WARM-UP QUIZ)

Q1.

B

Rect(x,y,width,height)

pygame.Rect(x,y,width,height)

pygame.rect(x,y,width,height)

A

pygame.Rect(x,y,width,height)

B

C

Option B is the correct syntax for creating a rectangle. We pass the x-position followed by the y-position, then the width and the height of the rectangle.

Choose the correct command for creating a rectangle in python.

What is the correct order to see a rectangle on screen?

A. Draw the rectangle on the screen.

B. Create a rectangle object

C. Pass the x coordinate , y coordinate, width and height.

Q2.

B

A-B-C

B-C-A

A-C-B

A

B-C-A

B

C

Option B is the correct. We first create the rectangle object using the pygame.Rect() command. Then we pass the required parameters. Finally to see the rectangle, we need to draw the rectangle on the screen

Revision :

Data in our daily lives

Processing Data

Sender

Back Office

Receiver

Is the human memory enough?

Sender

Back Office

Receiver

How does the computer store our data?

Computer

Mother Board

Memory Slots

Mathematical Operations on Variables

Addition

Subtraction

Division

Multiplication

import pygame
pygame.init() 
WHITE = (255,255,255)
DARKBLUE = (36,90,190)
LIGHTBLUE = (0,176,240)
size=(600,600)
screen = pygame.display.set_mode(size)
pygame.display.set_caption("Breakout Game")
paddle=pygame.Rect(300,500,60,10)
ball=pygame.Rect(200,250,10,10)
ballx=1
bally=1
carryOn = True
while carryOn:
    for event in pygame.event.get(): # User did something
            if event.type == pygame.QUIT: # If user clicked close
                  carryOn = False # Flag that we are done so we exit this loop             
    screen.fill(DARKBLUE)
    
    pygame.draw.rect(screen,LIGHTBLUE,paddle)
    ball.x=ball.x+ballx
    ball.y=ball.y+bally
    pygame.draw.rect(screen,WHITE ,ball)
    pygame.time.wait(20)
    pygame.display.flip()
pygame.quit()

http://bit.ly/g11c2t1

Output :

Expected Output:

Altering Movement Direction

How to make the ball move in the diagonally upward direction?


paddle=pygame.Rect(300,500,60,10)
ball=pygame.Rect(200,250,10,10)
ballx=1
bally=1

Hint:

Alter values of ballx and bally

https://bit.ly/g11c2s1

import pygame
pygame.init() 
WHITE = (255,255,255)
DARKBLUE = (36,90,190)
LIGHTBLUE = (0,176,240)
size=(600,600)
screen = pygame.display.set_mode(size)
pygame.display.set_caption("Breakout Game")
paddle=pygame.Rect(300,500,60,10)
ball=pygame.Rect(200,250,10,10)
ballx=-1
bally=-1
carryOn = True
while carryOn:
    for event in pygame.event.get(): # User did something
            if event.type == pygame.QUIT: # If user clicked close
                  carryOn = False # Flag that we are done so we exit this loop             
    screen.fill(DARKBLUE)
    
    pygame.draw.rect(screen,LIGHTBLUE,paddle)
    ball.x=ball.x+ballx
    ball.y=ball.y+bally
    pygame.draw.rect(screen,WHITE ,ball)
    pygame.time.wait(20)
    pygame.display.flip()
pygame.quit()

Fault in our game!!

Ball moves out and disappears!!

Decision making

> 60?

Logical operations

Greater than

Lesser than

Equals to

How the computer makes decisions?

age>60?

True

age>60?

True

age>60:

discount=200

tab space

colon

Syntax:

import pygame
pygame.init() 
WHITE = (255,255,255)
DARKBLUE = (36,90,190)
LIGHTBLUE = (0,176,240)
size=(600,600)
screen = pygame.display.set_mode(size)
pygame.display.set_caption("Breakout Game")
paddle=pygame.Rect(300,500,60,10)
ball=pygame.Rect(200,250,10,10)
ballx=-1
bally=-1
carryOn = True
while carryOn:
    for event in pygame.event.get(): # User did something
            if event.type == pygame.QUIT: # If user clicked close
                  carryOn = False # Flag that we are done so we exit this loop             
    screen.fill(DARKBLUE)
    
    pygame.draw.rect(screen,LIGHTBLUE,paddle)
    ball.x=ball.x+ballx
    ball.y=ball.y+bally
    if ball.x>=590:
      ballx=-ballx
    if ball.x<=10:
      ball.x=-ballx
    pygame.draw.rect(screen,WHITE ,ball)
    pygame.time.wait(20)
    pygame.display.flip()
pygame.quit()

http://bit.ly/g11c2t2

Output:

import pygame
pygame.init() 
WHITE = (255,255,255)
DARKBLUE = (36,90,190)
LIGHTBLUE = (0,176,240)
size=(600,600)
screen = pygame.display.set_mode(size)
pygame.display.set_caption("Breakout Game")
paddle=pygame.Rect(300,500,60,10)
ball=pygame.Rect(200,250,10,10)
ballx=-1
bally=-1
carryOn = True
while carryOn:
    for event in pygame.event.get(): # User did something
            if event.type == pygame.QUIT: # If user clicked close
                  carryOn = False # Flag that we are done so we exit this loop             
    screen.fill(DARKBLUE)
    
    pygame.draw.rect(screen,LIGHTBLUE,paddle)
    ball.x=ball.x+ballx
    ball.y=ball.y+bally
    if ball.x>=590:
      ballx=-ballx
    if ball.x<=10:
      ball.x=-ballx
      
    if ball.y>=590:
      bally=-bally
    if ball.y<=10:
      ball.y=-bally
      
    pygame.draw.rect(screen,WHITE ,ball)
    pygame.time.wait(20)
    pygame.display.flip()
pygame.quit()

http://bit.ly/g11c2s2

Expected output

(WRAP-UP QUIZ)

Choose the correct output

Error

Q.1

x=5
if x<10:
print(x+4*10)

B

45

90 A

Error

B

C

Option B is correct. There is an indentation error as the if statement should be followed by a tab space before each statement under the loop

Choose the correct output

True

Q.2

B

No output

12 A

True

B

C

x=10
x=x+6/3
if x==12:
  print("True")

According to Bodmas division will be executed first before addition, so the equation will be solved as:

x=10+2 x=12

Hence the logical check will print True.

So option B is correct.

Expected Output:

Paddle movement

SAA-1

How will you make the paddle move?

Hint:

- Paddle will only move in x direction.

-Create "paddlex" variable

-Increment the paddle's x coordinate.

paddlex=2

paddle.x+=paddlex

https://bit.ly/3deEZ0T

import pygame

ballx=-1
bally=-1
paddlex=1
carryOn = True
while carryOn:
    for event in pygame.event.get(): # User did something
            if event.type == pygame.QUIT: # If user clicked close
                  carryOn = False # Flag that we are done so we exit this loop             
    screen.fill(DARKBLUE)
    paddle.x=paddle.x+paddlex
    
    pygame.draw.rect(screen,LIGHTBLUE,paddle)
    ball.x=ball.x+ballx
    ball.y=ball.y+bally

SAA1 solution

SAA-2

Restricting paddle movement

How will you restrict the paddle within the screen?

Hint:

-Screen ranges from 0 to 600 in width.

-Paddle length is 60.

-So paddlex coordinate should be between 0 and 540.

-Similarly:

if paddle.x<0:
  paddlex=-paddlex

if paddle.x>540:
  paddlex=-paddlex

Expected Output:

import pygame
pygame.init() 
WHITE = (255,255,255)
DARKBLUE = (36,90,190)
LIGHTBLUE = (0,176,240)
size=(600,600)
screen = pygame.display.set_mode(size)
pygame.display.set_caption("Breakout Game")
paddle=pygame.Rect(300,500,60,10)
ball=pygame.Rect(200,250,10,10)
ballx=-1
bally=-1
paddlex=1
carryOn = True
while carryOn:
    for event in pygame.event.get(): # User did something
            if event.type == pygame.QUIT: # If user clicked close
                  carryOn = False # Flag that we are done so we exit this loop             
    screen.fill(DARKBLUE)
    paddle.x=paddle.x+paddlex

    if paddle.x>=540:
        paddlex=-paddlex
    if paddle.x<=60:
        paddlex=-paddlex
    
    pygame.draw.rect(screen,LIGHTBLUE,paddle)
    ball.x=ball.x+ballx
    ball.y=ball.y+bally
    if ball.x>=590:
      ballx=-ballx
    if ball.x<=10:
      ball.x=-ballx
      
    if ball.y>=590:
      bally=-bally
    if ball.y<=10:
      ball.y=-bally
      
    pygame.draw.rect(screen,WHITE ,ball)
    pygame.time.wait(20)
    pygame.display.flip()
pygame.quit()

SAA2 solution

Links Table

Activity	Activity Name	Link
Teacher Activity 1	Ball Movement
Teacher Activity 2	Ball Movement with restrictions
Teacher Activity 2(S)	Teacher Activity 2 solution
Student Activity 1	Ball Movement
Teacher activity 3	Ball Movement with restrictions
Teacher Activity 3(S)	Teacher Activity 3 solution
Student Additional Activity 1	Paddle Movement
Teacher activity 4	Paddle Movement (Student Additional Activity 1-Solution)
Teacher activity 3	Paddle Movement with restrictions (Student Additional Activity 2-Solution)

http://bit.ly/g11c2t1

http://bit.ly/g11c2t2

http://bit.ly/g11c2s1

http://bit.ly/g11c2s2

http://bit.ly/g11c2sa1

http://bit.ly/g11c2sa2

https://bit.ly/3deEZ0T

https://bit.ly/3vYRXq6

Copy of G11_C2

By anjali_sharma