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A mazing Game

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A mazing Game

  1. 1. A Mazing Game
  2. 2. Starter Activity: Maze Games Check out the maze style games: http://scratch.mit.edu/tagged/shared/maze A Mazing Game
  3. 3. A Mazing Game In this lesson you will use algorithms to help code a solution that uses conditional statements to make a program loop. You will create a maze style game. Lesson  Understand the use of an algorithm to develop a solution to a problem  Translate an algorithm into code  Use conditional statements Objectives
  4. 4. Introduction You are going to create a simple game where the player guides an ‘explorer’ character around a maze using the arrow keys. The game will end when the explorer rescues its friend in the middle. A Mazing Game
  5. 5. Watch the video Maze which is in the programming in scratch folder in Groupwork to learn how to create the game. A Mazing Game
  6. 6. Task 6: Setting the Scene Set up the game by importing the stage costume (Maze) and two sprites – an explorer and a friend for the explorer to rescue. N.B The maze is already in the backgrounds folder Don’t do any more at this point. A Mazing Game
  7. 7. The Importance of Design Before you make anything – a house, a car or a computer program – you should start with a design. There are two important parts to most programs – the interface (how it looks) and the code – you design these separately. A Mazing Game
  8. 8. The easiest way to design the interface is by sketching it out on paper. To design the code, the easiest way is to write out a list of steps you want the code to perform in English. This is known as an algorithm. Algorithms let programmers concentrate on what the code has to do, instead of how to do it on the computer. A Mazing Game
  9. 9. Designing the Solution Think about the two main things that you will need to code: 1. Moving the explorer around the maze 2. Getting the explorer to rescue its friend The table on the next slide shows an algorithm for moving the explorer around the maze and the Scratch code that does the same thing. A Mazing Game
  10. 10. Algorithm for moving explorer Code when the flag is clicked repeat forever if right arrow key is pressed point right move 5 steps if left arrow key is pressed point left move 5 steps if up arrow key is pressed point up move 5 steps if down arrow key is pressed point down move 5 steps if explorer touches the same colour as the maze wall
  11. 11. Task 7: Moving the Explorer Using a combination of the algorithm and the code, develop your game so that you are able to move the explorer around the maze. Use of the video is forbidden from this point onwards. A Mazing Game
  12. 12. Algorithm for moving explorer Code when the flag is clicked repeat forever if right arrow key is pressed point right move 5 steps if left arrow key is pressed point left move 5 steps if up arrow key is pressed point up move 5 steps if down arrow key is pressed point down move 5 steps if explorer touches the same colour as the maze wall
  13. 13. Test your game to see if it works If it doesn’t see if you can identify the problem. A Mazing Game
  14. 14. Task 8: Rescuing the Explorers Friend From this algorithm, see if you can create the code for the friend sprite! A Mazing Game Algorithm for reaching centre of maze Code for friend sprite when the flag is clicked show sprite repeat forever if touching explorer sprite say “Thank you!” hide sprite stop all scripts Code this one yourself!
  15. 15. Test your game to see if it works If it doesn’t see if you can identify the problem. A Mazing Game
  16. 16. Plenary: Question 1 A programmer creates a maze game like the one you’ve just created. Unfortunately, the character doesn’t move as expected. What mistake has the programmer made? A Mazing Game
  17. 17. Plenary: Look at the two examples of code. Do they perform the same task? A Mazing Game Question 2
  18. 18. Plenary: Question 3 The code adjacent controls a sprite going round a maze. If the sprite touches the side of the maze (the colour blue), it returns to its starting position of -150, 150. Unfortunately, the sprite sometimes touches the walls of the maze and returns to the start when the player doesn’t expect. What mistake has the programmer made? A Mazing Game
  19. 19. Plenary: Question 4 In this example, the sprite is supposed to return to the centre of the maze when it touches the sides (coloured blue); however, it only does this sometimes. What mistake has the programmer made? A Mazing Game
  20. 20. A Mazing Game Keywords  Understand the use of an algorithm to develop a solution to a problem  Translate an algorithm into code  Use conditional statements Objectives  Loop  Sprites  Interface  Code  Indented  Conditional Statements  Collision Detection  Repetition   

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