Lesson 3 - Frogs and Scratch Shark Attack
Frogs, Field Maps App and Scratch Shark Attack Lesson
| Lesson number | Step by step instructions | Dropbox video link | Teacher resources |
|---|---|---|---|
| Lesson 2a | #Learn to Identify Red-rumped Parrots | 
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| Lesson 2b | #Peron's Tree Frog | 
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| Lesson 2b | #Planting Native Plants using ArcGIS Field Maps | 
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Field Maps App Demo video |
| Lesson 2d | #Scratch Shark Attack Game | 
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Learn to Identify Red-rumped Parrots
- Red-rumped parrots are often found in pairs.
- Males have a red rump.
- Females are olive green.
- They eat grass seeds
Peron's Tree Frog
- Found in swamps, wetlands and lagoons.
- They feed on insects.
- Their call sounds like a twisted laugh.
- They are only 6cm long.
- The frog in the video has climbed a River Bottlebrush (Callistemon sieberi)
Planting Native Plants using ArcGIS Field Maps
- When revegetating waterways we use the Field Maps app to record the location, date and name of native plants.
- This helps us find the plants and also record their growth rate.
- It is very important to do more revegetation around waterways to create more habitat for frogs and other animals.
- Contact your local government if you need help to organise a planting day especially if you want to plant a nature corridor.
Scratch Shark Attack Game
- Open Scratch.
- Click on the scissors tool and delete the cat
- Click on New Sprite
- Click on the Animals folder
- Choose Shark1-a
- Click on the shrink tool and shrink the shark.
- Click on the Costumes tab.
- Select Import to add another Shark costume to create an animation.
- Add Shark2-b and click on OK.
- Now you will have two shark costumes.
- Change the name of sprite to shark
- Click on teh Scripts tab.
- Create the following code block.
- Use the new motion block named point towards
- Click on the dropdown arrow in the point towards block.
- Select mouse pointer
- Run the code by either clicking on the code block or clicking on the green flag
- The shark will now follow the mouse pointer.
- Test the code by adding in move 2 steps.
- Then adding next costume
- Add a wait 0.1 seconds block if you want to slow down the shark.
- Later on we can easily remove this block if the shark is too slow.
- Save the current file.
- Click on File then Save As
- Name the file sharkAttack using Camel Notation
Add other Fish to the Shark Game
- Now its time to add other fish for the Shark to eat.
- Click on Choose new sprite from file
- Add a new fish sprite.
- Use the shrink tool to shrink the fish
- Construct the following code for the fish sprite.
- There is a small line placed on top of the fish sprite.
- This shows the direction the fish will move.
- Move this line so that the fish points in a new direction.
- To make sprites appear and disappear we use the Looks blocks show and hide
[[File:Screen Shot 2023-03-08 at 1.29.30 pm.png | 900px
- Build the following code block for the fish.
- We have added a new loop block named repeat until <touching shark>
- The fish will show itself when the green flag is clicked.
- And the fish will hide if it is eaten by the shark.
Starting the fish sprite from the top left corner
- At the start of every game we need the fish to start at the top left hand corner of the screen (or stage).
- To do this firstly drag the fish to the top left hand corner.
- Then drag the go to x: y: block and place it beneath the When the Green flag is clicked block.
- Now each time you start your game the fish will start in the top left of screen.
Adding a Score to the Game
- To keep score of how many fish the shark eats we can add a score board
- Click on Variables
- Select Make a variable
- Name the variable score
- Ensure it is for All sprites
- Click OK.
- A score board will now appear on the stage.
- You can drag the score board to any position on the stage.
- Drag the change score by 1 block and place it at the end of the fish code block.
- Now every time the shark eats the fish the score will increase by one.
Making the Shark sprite faster
- To make the shark sprite more responsive.
- Remove the wait block.
- Make the shark move 3 steps
Making fish appear Randomly on the Stage =
- To keep the game interesting we need the fish to appear at different locations on the stage each time teh game starts.
- We can use random blocks. Random blocks generate random numbers. Similar to rolling a dice.
- Change the values in the random block to -100 and 100
- We need two random blocks.
- Add one random block for the x axis and the other random block to the y axis in the go to x: y: block.
- Now the fish will appear in a random location on the stage.
Duplicate Fish sprites to make School of Fish
- To make an exact copy of a fish sprite right mouse button click and select duplicate
- You can make as many fish as you need for your game.
- The finished game should look similar to the screen capture below.
