Harry Potter Scratch Game

Name: Harry Potter Scratch Game
Uploaded: 2017-07-22T10:43:50+00:00
Duration: PTM16S28
Channel: Mervyn Spencer
Description: Harry Potter Scratch Game

Harry Potter Scratch Game
Pranali Choubal Kunal Shah Barb Ericson Dec 2007 Harry Potter Scratch Game

The Game Use the arrow keys to move Harry Potter to catch the golden snitch to avoid being hit by the bludger Harry Potter Scratch Game

Getting Started Start Scratch Delete the cat Click on scissors and then the cat or right click on the cat and pick delete Harry Potter Scratch Game

Change the Background Click on the stage to select it Click on the Backgrounds tab Click on the import button Harry Potter Scratch Game

Select New Background Navigate to the HarryPotter folder Select the Stadium and click OK Harry Potter Scratch Game

The Stage is Set Harry Potter Scratch Game

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 Harry Potter Scratch Game

The Game so Far Harry Potter Scratch Game

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 Harry Potter Scratch Game

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 In Scratch you can click on numbers and type in new numbers. When you drag blocks out a white line will appear to show you where the block will go when you drop it. Harry Potter Scratch Game

The Scratch Stage The Scratch stage is 480 pixels wide and 360 pixels high. 180 y decreases y increases -240 240 x decreases x increases X increases to the right and decreases to the left. Y increases going up and decreases going down. -180 Harry Potter Scratch Game

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 Try it and see Harry fly around the stadium when you press the arrow keys. Harry Potter Scratch Game

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 Harry Potter Scratch Game

Harry and the Snitch Harry Potter Scratch Game

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 Harry Potter Scratch Game

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 Click on OK Names for variables in Scratch can have spaces in them. Harry Potter Scratch Game

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" Be sure that you drop the set Snitches Caught to 0 block when the white line shows that it will be connected to the when green flag clicked block. You can check this by clicking and dragging on the when green flag clicked and check that both blocks move. Harry Potter Scratch Game

Messages Scripts can receive 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 Harry Potter Scratch Game

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 Harry Potter Scratch Game

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 When the snitch is caught it should hide and then add 1 to the number of snitches caught variable. Then it should go to a random location on the screen (avoiding the top of the screen since the variables are shown there). Then show the snitch and play a sound. Harry Potter Scratch Game

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 Harry Potter Scratch Game

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 Right click on the if block and pick "duplicate" and add to all the other scripts for Harry Potter Harry Potter Scratch Game

Catching the Snitch Right click on the if block and select duplicate Drop the copy on the other scripts Move the scripts to see them better If you run out of room scroll bars will appear. Use these to see the rest of the scripts. Harry Potter Scratch Game

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 Harry Potter Scratch Game

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 if you have won these don't need to execute If the user has won the game there is no need to move the snitch and show it and play a sound. Harry Potter Scratch Game

Winning the Game drag in a "blank = blank" from Number drag in "Snitches Caught" to the first blank area from Variables click on second blank area and type in 10 drag in a broadcast block Create new message "Won" Harry Potter Scratch Game

Telling the User Click on Stage Click on Backgrounds Click on Import Navigate to HarryPotter folder Select Congrats click on OK We will tell the user s/he won by changing the background on the stage. This is like dropping a curtain on a real stage. It changes the background of the stage but the actors are still on the stage. Harry Potter Scratch Game

Stage Scripts Click on Stage and Scripts Set the initial background to the stadium when the green flag is clicked from Looks When the stage receives a Won message from Control switch background to Congrats Harry Potter Scratch Game

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 then click on the snitch sprite and scripts to check the copy worked Harry Potter Scratch Game

When Game Starts If the user wins and Harry and the Snitch hide when you restart the game they won't show again if you start a new game Add "when green flag clicked" show to: Harry Golden Snitch Harry Potter Scratch Game

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 Harry Potter Scratch Game

Add Lives Variable Click on Variables Click on Make a variable Enter Lives Drag display to top right Harry Potter Scratch Game

Start with 3 Lives Click on Stage Click on Scripts Add "set Lives to 0" Click on 0 and change to 3 Harry Potter Scratch Game

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 Harry Potter Scratch Game

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 use a stop all block to stop all scripts Use a repeat block to repeat some actions a given number of times We call items that allow you to repeat blocks a loop or iteration. Harry Potter Scratch Game

Bludger Scripts When the green flag is clicked loop forever set x to 260 hide the bludger wait for some random amount of time between 3 and 5 seconds show the bludger Glide to the opposite side x is -260 random y from -145 to 145 A forever loop will stop when the stop all scripts. Harry Potter Scratch Game

Bludger Scripts When the green flag is clicked, loop forever check if touching Harry play a sound reduce the number of lives check if lost lives = 0 wait till not touching Harry or you will die quickly If you don't wait till you aren't touching Harry this loop will repeat and you will end the game very quickly. Harry Potter Scratch Game

Tell User Game Over Click on Stage Click on Backgrounds Click on Import Select HarryPotter folder Select Game Over Click OK Harry Potter Scratch Game

New Stage Script Click on Scripts Add "when I receive Lost" from Control Add "switch background Game Over" from Looks Add "stop all" Add "stop all" to the end of when receive "Won" script too The stop all will stop other scripts even if they have a forever loop. Harry Potter Scratch Game

Hide Sprites When Lose When the game is lost hide Harry hide the Snitch Harry Potter Scratch Game

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 Harry Potter Scratch Game

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 Add a script to the stage When the green flag is clicked Loop forever playing the theme and waiting for it to finish Make the Bludger come from any direction and glide across to the opposite side Add Beaters who can hit the Bludger away Using the space key Add a time limit That counts done Harry Potter Scratch Game

Harry Potter Scratch Game

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