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Harry Potter Game

Harry Potter Game. Pranali Choubal Kunal Shaw Barb Ericson Dec 2007. The Game. Use the arrow keys to move Harry Potter to catch the golden snitch to avoid being hit by the bludger. Getting Started. Start Scratch Delete the cat Click on scissors and then the cat

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Harry Potter Game

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  1. Harry Potter Game Pranali Choubal Kunal Shaw Barb EricsonDec 2007 Adventures in Animation

  2. The Game • Use the arrow keys to move Harry Potter • to catch the golden snitch • to avoid being hit by the bludger Adventures in Animation

  3. Getting Started • Start Scratch • Delete the cat • Click on scissors and then the cat • or right click on the cat and pick delete Adventures in Animation

  4. Change the Background • Click on the stage to select it • Click on the Backgrounds tab • Click on the import button Adventures in Animation

  5. Select New Background • Navigate to HarryPotter folder Select the Stadium and click OK Adventures in Animation

  6. The Stage is Set Adventures in Animation

  7. Add Harry Potter • Click on the folder with a star on it to add a sprite from a file • Navigate to the HarryPotter folder • Add Harry Adventures in Animation

  8. The Game so Far Adventures in Animation

  9. Scratch is Event Driven • You can make things happen when events occur • such as a key is pressed • the green flag is clicked on • a message is received Adventures in Animation

  10. Making Harry Move • Click on the Scripts Tab • Click on Control and drag out • when space key pressed • Change to left arrow key • Click on Looks and drag out • switch to costume • Change to Harry_Left • Click on Motion and drag out • change x by 1 • click on 1 and change to -4 Adventures in Animation

  11. The Scratch Stage • The Scratch stage is 480 pixels wide and 360 pixels high. 180 -240 240 -180 Adventures in Animation

  12. Add Other Key Scripts • When right arrow • change to Harry_Right costume • change x by 4 • When down arrow • change y by -4 • When up arrow • change y by 4 Adventures in Animation

  13. Add the Golden Snitch • Click on the folder with a star on it to add a sprite from a file • Navigate to the HarryPotter folder • Add the snitch Adventures in Animation

  14. Harry and the Snitch Adventures in Animation

  15. Snitch Behavior • In a 'normal' Quidditch game the game is over when the snitch is caught • But, in this game you will have to catch 10 snitches to win. • you will need to keep track of the number caught • Each time the snitch is caught it will hide and reappear in a new random location Adventures in Animation

  16. Variables • To remember how many snitches were caught we will need a variable • the value stored in a variable can change (vary) • Click on the Variables button • Then click on Make a Variable • Enter a name for the variable • Use the default of For all sprites Adventures in Animation

  17. Starting • Scratch games and animations usually start when you click the green flag • Click on Stage to select it • Click on Scripts to program • Click on Control to see the control blocks • Drag the "when green flag clicked" block out • Click on Variables • drag the "set Snitches Caught to 0" Adventures in Animation

  18. Messages • Scripts can wait for messages and broadcast messages • blocks are in the Control area • Click on the snitch sprite, then Scripts then Control • To create a message drag out the "when I receive" and click on the down arrow • then on new… • Give the message the name Caught • click on OK Adventures in Animation

  19. More about Messages • Broadcasting and receiving messages is how sprites communicate with each other • it doesn't cause anything to be printed or appear • it does execute scripts that receive the message • All broadcasted messages should have one or more sprites that receive the message Adventures in Animation

  20. Responding to Caught • Hide the snitch • drag hide from Looks • Add one to the number of snitches caught • drag from Variables • Change the x and y values • drag from motion • replace values with random numbers • from Number • Show the snitch • drag from Looks • Play a sound • drag from Sound Adventures in Animation

  21. Conditional Execution • Sometimes we want to execute a block or several blocks if some condition is true • use sensing blocks or number blocks that return true or false • these have 6 sides (hexagon) • The snitch is captured if Harry is touching it • Use an if from Control to check if Harry is touching the snitch sprite Adventures in Animation

  22. Catching the Snitch • If the Harry Potter sprite is touching the snitch sprite • add if • from Control • add "touching …" and change to "Sprite3" • from Sensing • Broadcast the Caught message • from Control • Right click on if part and pick "duplicate" • and add to all the other scripts for Harry Potter Adventures in Animation

  23. Catching the Snitch • Right click on the if touching sprite3 and select duplicate • Drop the copy on the other scripts • Move the scripts to see them better Adventures in Animation

  24. More on Conditionals • Sometimes we want to execute some blocks if a condition is true and other blocks if it is false • Use a if and else block from Control for this Adventures in Animation

  25. Winning the Game • In the snitch script that receives the caught message • drag in a if and else • from Control • place it after the change Snitches Caught by 1 • move the last 3 tiles into the else part Adventures in Animation

  26. Winning the Game • drag in a "blank = blank" • from Number • drag in "Snitches Caught" • from Variables • click on second blank and type in 10 • drag in a broadcast tile • Create new message "Won" Adventures in Animation

  27. Telling the User • Click on Stage • Click on Backgrounds • Click on Import • Navigate to HarryPotter folder • Select Congrats • click on OK Adventures in Animation

  28. Stage Scripts • Click on Stage and Scripts • Set the initial background to the stadium • when the green flag is clicked • from Looks • When receive Won message • from Control • switch background to Congrats • from Looks Adventures in Animation

  29. Hide Other Sprites • If the user has won • hide the other sprites • Harry Potter • Snitch • You can click on the "when I receive Won" • and drag it to the snitch sprite to copy it Adventures in Animation

  30. When Game Starts • If the user wins and Harry and the Snitch hide when you restart the game • they won't show again • Add "when green flag clicked" show to: • Harry • Golden Snitch Adventures in Animation

  31. Making it Harder • add a Bludger • if the Bludger hits Harry he "dies" • start with 3 lives • lose a life each time Harry dies • if Harry loses all 3 lives you lose the game Adventures in Animation

  32. Add Lives Variable • Click on Variables • Click on Make a variable • Enter Lives • Drag display to top right Adventures in Animation

  33. Start with 3 Lives • Click on Stage • Click on Scripts • Add "set Lives to 0" • Click on 0 and change to 3 Adventures in Animation

  34. Painting a Bludger • You can paint a new sprite • click on the paintbrush with a star on it • Click the color • Click the circle shape tool • Click and drag to make the circle • Click on OK Adventures in Animation

  35. Loops • Sometimes you want to repeat blocks until the game ends or something happens • Use a forever block to repeat actions until the game ends • stop all block • Use a repeat block to repeat some actions a given number of times Adventures in Animation

  36. Bludger Scripts • When the green flag is clicked loop forever • set x to 260 • hide • wait for some random amount of time between 3 and 5 seconds • show • Glide to opposite side • x is -260 • random y from -145 to 145 Adventures in Animation

  37. Bludger Scripts • When the green flag is clicked, loop forever • check if touching Harry • play sound • reduce number of lives • check if lost • lives = 0 • wait till not touching Harry Adventures in Animation

  38. Tell User Game Over • Click on Stage • Click on Backgrounds • Click on Import • Select HarryPotter folder • Select Game Over • Click OK Adventures in Animation

  39. New Stage Script • Click on Scripts • Add "when I receive Lost" • from Control • Add "switch background Game Over" • from Looks • Add "stop all" • from Control • Add "stop all" to the end of when receive "Won" script too Adventures in Animation

  40. Hide Sprites When Lose • When the game is lost • hide Harry • hide the Snitch Adventures in Animation

  41. Project Notes • Click on the notepad in the top right corner • Type in project notes • You can upload your project to the Scratch web site • Click on Share! • See it at http://scratch.mit.edu Adventures in Animation

  42. Extensions • Speed up the Bludger each time a snitch has been caught • Will need a variable for "Time to Cross" • Reduce the variable each time each time the snitch is caught • Add background music • Import Theme.wav Adventures in Animation

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