Student Instructions

Reverse the Gears

The gears are back. They already spin when you press the space bar, but now you'll want to reverse them when you're not spinning it.

Do This

• Makes the gears spin opposite of the direction that they do when the space bar is pressed.

Student Instructions

Random Around Point

Now that you can make the bee follow the mouse, lets make a bee fly around the mouse as shown in the picture on the right. In order to do this, you will need to add a random amount between -50 and 50 to the mouseX or mouseY.

Do This

You already have a bee sprite that follows the mouse.

• Update the x and y location to be randomly close to the mouse.
  • Add a random number between -50 and 50 to the World.mouseX and World.mouseY.
• If necessary, use the World.frameRate block to slow down the animation and find the best frame rate.

Challenge: Add 3 more bees that follow the mouse in the same way to make a swarm of bees.

Student Instructions

Student Instructions

Student Instructions

Mouse Clicks

Keypresses are great, but sometimes you want users to interact through mouse clicks. There's a new block called mouseDown which, similar to keyDown, checks whether the left or right mouse buttons is being pressed. If you are using a computer with a mouse or trackpad that has only one button, you'll want to always use mouseDown("left").

Do This

Here's a program that drops a balloon down the screen - you're going to program the mouse button to raise the balloon back up while it's clicked.

• Add an if else statment that checks for mouseDown.
• Inside the conditional, move the balloon up one pixel if the mouse is down. Otherwise, move the balloon down.

Hint: You'll need to move the code that drops the balloon for this to work - you only want it to run if mouseDown is false

Challenge: Can you make the balloon drift randomly to the left and right as it rises and falls?

Student Instructions

Responding to a Single Click

Earlier we learned that keyWentDown and keyWentUp can be used to respond to a keypress a single time. The blocks mouseWentUp and mouseWentDown allow you to do that for the mouse!

Do This

Let's make a simple game that counts how many times you've clicked. We've already provided a variable clicks that you can use to track how many times the user has clicked.

• Add a conditional that checks if the mouse went down.
• Inside your conditional, add to the clicks variable.

Challenge: Can you add a sprite that responds to mouseWentDown as well? Add an image of your choice and increase the sprite's size each time the mouse is clicked.

Student Instructions

mouseDidMove

We can also use Boolean expressions to check whether or not the mouse has moved. The mouseDidMove block will return false if the mouse is still, but true if the mouse has been moving.

Do This

Right now, this program just displays a salt shaker sprite. You'll need to use mouseDidMove so that you can "shake" the salt by moving the mouse back and forth.

• Add a conditional that checks if mouseDidMove.
• If the conditional is true, rotate the salt sprite randomly to the left or right.

Challenge: Can you keep track of how many times the mouseDidMove shakes the salt, and then rotate it right side up after 100 shakes?

Student Instructions

Free Play

Use what you've learned to create whatever you like. When you're finished, you can click to send your creation to a friend, or to send it to your Projects Gallery.