Step 1: Create an Algorithm We create algorithms to find solutions to problems. In this case, you are writing an algorithm to complete the new addition to your app. You can either create a flowchart using word processing software or a free website like draw.io, or you can write it in pseudocode in a word processing document. Step 2: Add a New Sprite Log in to App Inventor 2 and open the app that you created in the lessons. In Designer mode, create a second sprite and upload a suitable image for it. In Blocks mode, use the block that will detect when your second sprite has been collided into, and add another block that will make the second sprite invisible. Step 3: Add a Clock Next, add a clock component to your app. In Designer mode, drag over the clock component from the Sensor category. Change the time interval (in Properties) to 100. Let’s use the clock component to make the second sprite move horizontally across the screen. In Block mode, add the following blocks to your program: App Inventor 2 is licensed under the Creative Commons Attribution 4.0 International license (CC BY 4.0). Hint: Remember to match the colors with their drawers. So, for the blue block above, look in the blue Math drawer. Change one of the blocks above to make the second sprite move diagonally rather than horizontally. Step 4: Test and Debug Test your app on the emulator or on an Android device. Debug (fix) any glitches that you notice.
Step 1: Create an Algorithm
1. Define the problem: The app needs to have a new addition where a second sprite is added and moves horizontally or diagonally across the screen.
2. Determine the requirements:
a. Add a new sprite to the app.
b. Allow detection of collision between the first and second sprite.
c. When detected, make the second sprite invisible.
d. Add a clock component to control the movement of the second sprite.
e. Set the time interval of the clock to 100 milliseconds.
f. Move the second sprite horizontally across the screen.
g. Optionally, make changes to move the second sprite diagonally.
h. Test and debug any glitches or errors.
Step 2: Add a New Sprite
1. Open App Inventor 2 and the app that needs the additional second sprite.
2. In Designer mode, create a new sprite by adding an image that is suitable for it.
3. In Blocks mode, use the appropriate block to detect collision between the first and second sprite.
4. Add a block that will make the second sprite invisible on collision.
Step 3: Add a Clock
1. Add a clock component to the app by dragging it from the Sensor category in Designer mode.
2. Change the time interval of the clock in its Properties to 100 milliseconds.
3. Use the clock component to make the second sprite move horizontally across the screen.
4. In Blocks mode, add the necessary blocks to the program according to the algorithm:
When Clock1.Timer do
Move second sprite horizontally +10 units // replace with appropriate blocks for horizontal movement
Optional: Change one of the blocks to make the second sprite move diagonally rather than horizontally.
Step 4: Test and Debug
1. Test the app on the emulator or an Android device.
2. Observe and identify any glitches or errors in the functionality of the added second sprite.
3. Debug and fix any issues that are noticed, ensuring smooth movement and proper collision detection of the sprites.
Can you make an example
Sure! Here's an example algorithm for adding a new sprite and making it move diagonally in an app:
Step 1: Create an Algorithm
1. Define the problem: The app needs to have a new sprite that moves diagonally across the screen.
2. Determine the requirements:
a. Add a new sprite to the app.
b. Allow detection of collision between the first and second sprite.
c. When detected, make the second sprite invisible.
d. Add a clock component to control the movement of the second sprite.
e. Set the time interval of the clock to 100 milliseconds.
f. Move the second sprite diagonally across the screen.
g. Test and debug any glitches or errors.
Step 2: Add a New Sprite
1. Open App Inventor 2 and the app that needs the additional second sprite.
2. In Designer mode, create a new sprite by adding an image that is suitable for it.
3. In Blocks mode, use the "when Sprite1.CollidedWith(Sprite2)" block to detect collision between the first and second sprite.
4. Add the "Sprite2.Hide" block to make the second sprite invisible on collision.
Step 3: Add a Clock
1. Add a clock component to the app by dragging it from the Sensor category in Designer mode.
2. Change the time interval of the clock in its Properties to 100 milliseconds.
3. Use the clock component to make the second sprite move diagonally across the screen.
4. In Blocks mode, add the following blocks to the program:
When Clock1.Timer do
Move Sprite2 diagonally +10 units horizontally and +10 units vertically
Step 4: Test and Debug
1. Test the app on the emulator or an Android device.
2. Observe and identify any glitches or errors in the functionality of the added second sprite.
3. Debug and fix any issues that are noticed, ensuring smooth movement, proper collision detection, and visibility of the sprites.