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Fun4 Eat Apple

In this project, we use an infrared obstacle avoidance module to guide the Beetle sprite to an apple.

After clicking the green flag, swiftly pass your hand over the left obstacle avoidance module (block and quickly remove your hand from in front of the module) to initiate Beetle’s rotation. Once it aligns properly, sweep your hand over the module again to move Beetle forward, ensuring it avoids the black lines on the map. If adjustments or turns are necessary, swipe your hand over the module again to rotate Beetle to the desired angle. Repeat these steps until the Beetle sprite reaches the apple.

Below are the steps for implementing the project. It’s recommended to follow these initially, and once familiar, you may modify the effects as you wish.

1. Draw the Maze Backdrop

Here, we will draw a map backdrop with a red apple on it.

  • First, select a blank backdrop.

    ../../_images/apple_click_backdrop.png

  • Click Backdrops to start drawing the map backdrop. First, rename the backdrop to Maze.

    ../../_images/apple_open_backdrop.png

  • Use the Line tool, set the color to black, width to 4, and start drawing the map. You can design your map based on your ideas; it doesn’t have to be like mine.

    ../../_images/apple_paint_bk_maze2.png

  • Now, draw an apple. Using the Circle tool, draw an ellipse or circle in red with no outline.

    ../../_images/apple_paint_bk_maze3.png

    Note

    You can remove the outline by clicking the Outline window and then using the Remove tool.

    ../../_images/apple_paint_bk_maze4.png

  • Select the Brush tool and choose a color and width to finish drawing the apple.

    ../../_images/apple_paint_bk_maze5.png

2. Draw the Win Backdrop

Now start drawing; refer to the steps below, or draw your backdrop based on your creativity, ensuring it represents a victory.

  • Click the button to add a new backdrop at the bottom, select Paint, and name this backdrop Win.

    ../../_images/apple_paint_bk_win.png

  • Using the Circle tool, draw an ellipse in red with no outline.

    ../../_images/apple_paint_bk_win2.png

  • Then, use the Text tool to write “WIN!”. Set the font color to black and adjust the size and position of the text.

    ../../_images/apple_paint_bk_cus2.png

3. Scripting for the Maze Backdrop

Ensure the backdrop is switched to Maze every time the game starts.

../../_images/apple_switch_backdrop.png

4. Select the Beetle Sprite

  • Delete the default sprite and select the Beetle sprite.

    ../../_images/apple_choose_sprite.png

  • Place the Beetle sprite at the entrance of the Maze backdrop, noting the x, y coordinate values at this point, and resize the sprite to 40%.

    ../../_images/apple_place_sprite.png

5. Scripting for the Beetle Sprite

Now, write a script for the Beetle sprite to move forward and change direction under the control of the left obstacle avoidance module.

  • When the green flag is clicked, set the Beetle angle to 90, and the position to (-124, -113), or use the coordinate values of your placement.

    ../../_images/apple_point_in.png

  • Create the variable flag and set its initial value to -1.

    ../../_images/apple_vable_flag.png

Next, within the [forever] block, use four [if] blocks to manage different scenarios.

  • If the left infrared is blocked, use the [mod] block to toggle the variable flag between 0 and 1 (alternating between 0 for this press and 1 for the next).

    ../../_images/apple_read_ir.png

  • If the flag is 0 (left infrared is blocked), let the Beetle sprite turn clockwise. If the flag is 1 (left infrared is blocked again), the Beetle moves forward. Otherwise, it continues turning clockwise.

    ../../_images/apple_read_flag.png

  • If the Beetle sprite touches black (the black line on the Maze backdrop), the game ends, and the script stops running.

    ../../_images/apple_touch_black1.png

    Note

    Click on the color area in the [Touch color] block and select the eyedropper tool to pick up the color of the black line on the stage. If you choose a random black, this [Touch color] block will not function correctly.

    ../../_images/apple_touch_black.png

  • If the Beetle touches red (also use the straw tool to pick up the red color of the apple), the backdrop switches to Win, indicating the game is successful, and the script stops running.

    ../../_images/apple_touch_red.png

Programming complete, you can now click the green flag to run the script and see if it achieves the desired effect.