G12_C6_For_Teacher

Bullet Firing

Activity Flow	Slide No.	Topic	Time
TA	4-8	Last class revision+quiz	1 min
	9-13	State of Bullets	6 min
	14-18	TA1: Adding bullets to Spaceship	6 min
	19-21	Firing of Bullets	8 min
SA	22-26	SA1: Fire the bullets, when bullets are in ready state	8 min
Wrap Up	27-30	Wrap Up Quiz	5 min
	31-32	SAA1: Resolve swinging problem of Bullets
	33-34	Creation of application that shows time table of daily routine of students
	35	Thank You!

Class Structure

Slide No.	Topic
9-13	State of Bullets
14-18	TA1: Adding bullets to Spaceship
19-21	Firing of Bullets
25	SA1 solution: Fire the bullets, when bullets are in ready state
32	SAA1 solution: Resolve swinging problem of Bullets
34	SAA2 solution

Preparation and Reference

Prerequisites

FOR STUDENTS

Computer with Internet connection.
Spyder IDE installed.
"pygame" package installed.

FOR TEACHER

Computer with Internet connection.
Latest browser installed.
"pygame" package installed.
Spyder IDE installed.

What we did in the last class?

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(WARM-UP QUIZ)

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Which syntax is correct to add a new value at the end of list?

A

list.append(value)

list.insert(value)

Q.1 A

list.add(value)

B

C

append function of the list is used to add the items at the end of the list. So option A is correct.

D

list.addItem(value)

What would be the output of the following?

B

Integer number between 4 to 10

decimal number

between 3.5 to 10.0

Q.2 A

Error

B

C

randint() generates only integral numbers. It never works with real values. So it will throw an error.

D

Combination of integral and decimal value from 3.5 to 10

import random

print(random.randint(3.5,10))

Same images

Game Feature to be added

In today's class, we will add bullets to the spaceship and create a firing feature.

Bullet has two states

The Game State that we are going to develop:

1. Creation of Bullet (that is Ready State)

2. Firing of Bullet

What is State?

What is State?

Ready State

Moving State

When an object changes its position/behavior it is called changing of state.

Flow of program

1. Drawing a rectangle as a bullet.

2. Change it to ready state.

3. Set its position near the spaceship/player.

4. Add an event on which bullet will fire so change the state of the bullet to fire state.

5.If the bullet is in a fire state move the location of the bullet.

6. If the bullet crosses the boundary of the game window, set the bullet in a ready state.

GREAT!

Same images

https://bit.ly/2SYJKEU

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Teacher Activity

Step 1 - Bullet creation

Game loop

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Solution link:https://bit.ly/3w4qjIi

enemycount=10
enemies=[]
evlx=[]
evly=[]

bullet=pygame.Rect(200,200,5,5)

bulletState="ready"

for i in range(1,enemycount):

Creating rectangle for bullet

Set the state of the bullet to ready. That means bullet is ready to fire.

Same images

Step 2 - Check the ready state of bullet

       if event.key ==pygame.K_RIGHT:
            change = -6
       if event.key == pygame.K_UP:
            forward = True
            
   if bulletState == "ready":

      bullet.x=player.x
      
      bullet.y=player.y
      
pygame.draw.rect(screen,(225,225,15),bullet)

Check the state of the bullet, if it is in ready state

Set the x position of the bullet close to position of player's x and y-axis

Draw the rectangle to show the bullet on screen

Output Bullet in ready state

The bullet is not close to player. How to fix this?

if bulletState == "ready":

      bullet.x=player.x+20
      bullet.y=player.y+24

Add a number in x and y axis to hide the bullet

Step 3: Set the location of bullet near spaceship

if bulletState == "ready":
       bullet.x=player.x+15
       bullet.y=player.y+15

if bulletState == "ready":
       bullet.x=player.x+20
       bullet.y=player.y+20

How to fire a bullet?

That's great! When the user presses the space bar and the bullet is in a ready state.

Step 4 - Fire bullet on event

 if event.key == pygame.K_UP:
        forward = True
        
      if event.key == pygame.K_SPACE and bulletState=="ready":
       
          bulletState="fired"
      
    if bulletState == "ready":
      bullet.x=player.x+20
      bullet.y=player.y+24
      
     if bulletState=="fired":
     
   bullet.x ,bullet.y = newxy(bullet.x, bullet.y, 20 , angle)

Check if the user presses the space bar and state

of the bullet is in ready.

Check if this is fired state, call newxy(), and find the new position of the bullet.

Output

Hey, after firing once,

the bullet is not going back in the ready state. So it is not firing again. How to solve this?

Same images

Hint 1: Check the boundaries when we fire the bullet. The bullet's x and y-axis should neither be less than 0 nor more than the game window, 400x600.

Student Activity 1 : https://bit.ly/3w4qjIi

Task: Fire the bullets when bulltes is in ready state.

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Hint 3: Add a number for the y-axis to hide the bullet similar to x-axis as shown here.

if bulletState == "ready":

       bullet.x=player.x+20

Hint 2: Change the state of bullet from fire to ready state after hitting the boundaries like bulletstate="ready"

#in place of "_" Write your number
if bullet.y< _ or bullet.x< _ or bullet.y>_ or bullet.x>_:

Output of Student Activity

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Student Activity 1: https://bit.ly/3jkiGe8

if bulletState=="fired":
      bullet.x ,bullet.y = newxy(bullet.x, bullet.y, 20 , bangle)
      
  #change bullet state back to ready when it moves out
  
  if bullet.y<0 or bullet.x<0 or bullet.y>600 or bullet.x>400:
    bulletState="ready"
  
  pygame.draw.rect(screen,(225,225,15),bullet)        
   
  i=0

if bulletState == "ready":
       bullet.x=player.x+20
       bullet.y=player.y+24

What will change for an object when its state changes?

Velocity

Life of object

Q.1

Behaviour

Object Type

When an object changes its state, its behaviour changes. Just like when we fire the bullet, it changes its state from ready to fire state.

Suppose the window size of the game is 400x600.

The object should return after hitting the boundaries of the game window.

What would be the condition for the same?

object.y<0 or object.x<0 or object.y>600 or object.x>400

object.y>0 or object.x<0 or object.y>600 or object.x<400

object.y<0 or object.x>0 or object.y>600 or object.x<400

object.y>0 or object.x>0 or object.y<600 or object.x<400

Q 2

0 400

0 600

Hint:

1. Check the angle of the spaceship.

2. Prepare a new angle of the bullet. Depending angle of spaceship

3. call newxy(bullet.x, bullet.y, 20 , angle), with new angle.

Task: In the given student activity, we faced a problem that when the spaceship was rotating frequently and firing, the bullet was swinging. So how to resolve the problem?

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Output :

ADDITIONAL ACTIVITY - 1

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ADDITIONAL ACTIVITY - 1 SOLUTION

 if bulletState == "ready":
       bullet.x=player.x+20
       bullet.y=player.y+24
     
       bangle=angle  
      
  if bulletState=="fired":
  
       bullet.x ,bullet.y = newxy(bullet.x, bullet.y, 20 , bangle)

Solution : https://bit.ly/3A5pYIy

Hint:

1.Create a list of time-table

2. run for loop and fetch time from time table list

3. check fetched data from timetable

4. Print appropriate message

Task: Create an application where the application will show time-table of daily routine of students.

Same images

https://bit.ly/3qzQ6qJ

ADDITIONAL ACTIVITY - 2

Same images

ADDITIONAL ACTIVITY - 2

ADDITIONAL ACTIVITY - 2 SOLUTION

timetable=["21-5","6-7","8-15",'16-17','18-20','20-21']
for i in timetable:
    if i=="21-5":
        print("Sleeping Time "+i)
    elif i=="6-7":
        print("WakeUp Time "+i)
    elif i=="8-15"   :
        print("School Time "+i)
    elif i=="16-17":
        print("Rest Time  " +i)
    elif i=="18-20":
        print("Playing Time "+ i)
    elif i=="20-21":
        print("Home and Dinner Time "+ i)

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Activity	Activity Name	Link
Teacher Activity 1	Bullet Creation
Teacher Activity 2	Bullet Firing
Student Template	Bullet Creation
AA1	Bullet Swing
AA2	Function firing

Links Table

https://bit.ly/3w4qjIi

http://https://bit.ly/3jkiGe8

https://bit.ly/3w4qjIi

https://bit.ly/3A5pYIy

https://bit.ly/3qzQ6qJ

Copy of G12_C6_New_For_Teacher

By anjali_sharma

Copy of G12_C6_New_For_Teacher

Bullet Firing

Class Structure

Preparation and Reference

Prerequisites

FOR STUDENTS

Computer with Internet connection.

Spyder IDE installed.

"pygame" package installed.

FOR TEACHER

Computer with Internet connection.

Latest browser installed.

"pygame" package installed.

Spyder IDE installed.

What we did in the last class?

(WARM-UP QUIZ)

Which syntax is correct to add a new value at the end of list?

A

Q.1

A

B

C

D

What would be the output of the following?

B

Q.2

A

B

C

D

Game Feature to be added

Flow of program

GREAT!

How to fire a bullet?

ADDITIONAL ACTIVITY - 1

ADDITIONAL ACTIVITY - 1 SOLUTION

ADDITIONAL ACTIVITY - 2

ADDITIONAL ACTIVITY - 2

ADDITIONAL ACTIVITY - 2

ADDITIONAL ACTIVITY - 2 SOLUTION

Copy of G12_C6_New_For_Teacher

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