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Creating a Simple Game in Scratch

Creating a Simple Game in Scratch. Barb Ericson Georgia Tech. Start up Scratch. Click on Scratch.exe. Delete the Cat. Right click on the cat and pick delete Or click on the cat to select that sprite and then click on the scissors to delete it. Add the Baby.

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Creating a Simple Game in Scratch

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  1. Creating a Simple Game in Scratch Barb Ericson Georgia Tech

  2. Start up Scratch • Click on Scratch.exe

  3. Delete the Cat • Right click on the cat and pick delete • Or click on the cat to select that sprite and then click on the scissors to delete it

  4. Add the Baby • Click on the folder with a star in it • if you hover over it, it says "Choose new sprite from file"

  5. Select the People Folder

  6. Scroll to the Baby • Click on the baby and then OK

  7. Move the Baby • Select the baby and move it to the bottom of the window

  8. Respond to Arrow Keys • Click on Control (orange) and then drag out "when space key pressed"

  9. Respond to Right Arrow • Click on down arrow next to space and select right arrow • Click on Motion (blue) and drag out a "move 10 steps"

  10. Change the move amount • Click on the 10 • it will highlight in blue • Type 5 and enter

  11. Respond to Left Arrow • Click on Control (orange) • Drag out a "when space key pressed" • Change "space" to "left arrow" • Click on Motion • Drag out a "move 10 steps" • Change it to -5 (to move left) • Try out the left and right arrow keys • Does the baby leave the window?

  12. Paint a Ball • Click on the paint brush and star • It will say "Paint new sprite" if you hover over it

  13. Use the Paint Editor • Click on the Ellipse tool

  14. Select a Color

  15. Draw the Ellipse • Click and drag to create the ellipse • Then click on "OK"

  16. Move the ball to the top • Click and drag the ball to the top of the window

  17. Make the Ball Fall • When the green flag is clicked we want the ball to start at the top and fall down • Click on Control (orange) • Drag out a "When green flag clicked"

  18. Start the Ball • Click on Motion (blue) • Drag out go to x # y # • this will always start the ball at the current position • Drag out a "point in direction 90" • and change it to 180 (down)

  19. Make the ball fall • Click on Control (orange) • drag out a "forever" • Click on Motion (blue) • drag out a "move 10 steps" • change it to 1 step • Try it out!

  20. Catch the ball! • If the distance from the center of the ball to the baby is less than the half the size of the ball then it is caught • Let's track how many balls we have caught with a score

  21. Track the score • When we start the game set the score to 0 • Click on Variables (red) • Click on Make a Variable • Name it score

  22. Set score to 0 • Drag the forever down • Drag out a "set score to 0" • Notice the score showing on the window

  23. Did we catch the ball? • From Control drag out an if • We will check if the distance to the baby is less than half the ball size • So click on Number (green) and drag out a "blank < blank"

  24. Distance to baby • Click on Sensing (light blue) • Drag out a "distance to blank" • Change it to sprite1

  25. Half the Size of the Ball • Click on Number • Drag out a "blank / blank" • From Looks drag out a size • Type on second blank and type 2

  26. Increment the score • Click on Variables • drag out a "change score by 1" • Try it out! • is this what you expected?

  27. Reset the ball • Once you catch the ball • move it back to the top of the window • this time to a random x value • between the left edge and right edge • Click on Motion and drag out a "go to x # y #"

  28. Pick a random X value • Click on Number • drag out a "pick random 1 to 10" • drop on the x value • change the 1 to -235 and change 10 to 235 • change the y value to 161

  29. Adding Losing • If the baby doesn't catch the ball it just gets stuck at the bottom of the screen • Let's tell the player that he or she lost

  30. Add text sprite • Click on the Paint new sprite button • Click on the T for text • Move the square to where you want the text • Type You Lost!

  31. Hide the sprite • Click on Control • drag out "when green flag clicked" • Click on Looks • drag out hide

  32. Check if lost • If the ball hits the bottom of the window • the player has lost • Click on Control • drag out an if

  33. Check if at bottom • Click on Numbers • Drag out a "blank < blank" • Click on Motion • drag out a "y position" • Click on the last blank • type in -175

  34. Broadcast a message • Sprites communicate by passing messages • One sprite broadcasts the message • Other sprites can listen for it and react to it when they receive it • Click on Control • drag out "broadcast blank" • click on new – name it lost

  35. Receive Lost • Click on the text sprite • Click on Control • drag out "when I receive blank" • click on the down arrow and select lost • Click on Looks • drag out show • Click on Control • drag out stop all

  36. Record a Sound • Click on the ball sprite • Click on the Sounds tab • Click the Record button • Click the red circle to start • Click the black square to stop • Play with the right arrow

  37. Name the sound • Click in the sound name area and rename it

  38. Play the Sound • Click on Sound • drag out "play sound pop" • drop after increment the score • change pop to yum

  39. Add a Background • Click on stage • Click on the Backgrounds tab • Click on import • Select a new background

  40. Create Instructions • Click on the Show Project Notes in the upper right corner • Add the author and instructions

  41. Share your game • You can share your projects at the scratch web site • http://scratch.mit.edu • Click on the Share! button • You can also download other projects and see how they were created

  42. Other Ideas • Add a sound when you lose • Only catch the ball in the baby's mouth • Add the ability to win • When you reach a certain score • Track the amount of time it takes as well • Speed up the ball over time • Add more sprites to catch • Add a sprite to avoid • killer sprite

  43. Concept Summary • Variables • can hold values and can change value • Forever loops • repeat all the commands inside of them one at a time until the scripts are stopped • Conditionals – ifs • only execute the body of the if when the condition is true • Sprites can pass messages • and receive them • Sprites can react to events • like clicking the green flag and pressing the left or right arrow keys • Sprites can have several scripts, costumes, and sounds

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