Part2 Maze Runner : Menggunakan Custom Blok

Summary

In this tutorial, the instructor demonstrates how to program a cat sprite to navigate a maze using Scratch. The process begins with setting up the cat sprite's size and position before programming its movements. Using keyboard arrow keys, the cat can move in four directions—right, left, up, and down. The script includes key components like custom blocks, motion commands, and event triggers. The tutorial also addresses preventing the cat from crossing maze boundaries by detecting and reacting to a black line. This step-by-step guide empowers users to practice and refine their Scratch programming skills.

Takeaways

• 😀 The tutorial teaches how to program a cat sprite to move through a maze in Scratch.
• 😀 Before starting, open the Scratch application (either online or offline) and load the project file (usually ending in .SB3).
• 😀 The default sprite (Sprite 1) is renamed to 'cat' and resized to fit the maze area.
• 😀 The cat's position is adjusted using the X and Y coordinates, similar to the Cartesian coordinate system.
• 😀 The 'when green flag clicked' event is used to trigger the script, starting the program when the green flag is clicked.
• 😀 The 'show' block from the 'Looks' category ensures the cat sprite is visible during the game.
• 😀 The cat is programmed to move using the arrow keys, starting with the 'right' direction using custom blocks in Scratch.
• 😀 The custom block 'right' is defined to move the cat to the right by detecting the 'right arrow' key and changing its direction and costume.
• 😀 Similar programming steps are followed for the left, up, and down directions, using 'define' and 'duplicate' blocks to streamline the process.
• 😀 To prevent the cat from crossing the maze's black boundary, an 'if' block is used to detect the black color and stop the cat from moving through it.
• 😀 The tutorial concludes by programming the cat's movement restrictions within the maze and encourages viewers to practice the code themselves.

Q & A

What is the main objective of the tutorial in the script?

The main objective is to teach how to program a cat sprite to move through a maze in Scratch, using basic programming blocks and controls.

Why is the cat sprite size adjusted in the tutorial?

The size of the cat sprite is adjusted to fit the maze area, making it easier for the sprite to move through the maze without obstructing the paths.

What is the purpose of the 'when green flag clicked' event block in the Scratch program?

The 'when green flag clicked' event block triggers the execution of the entire script when the green flag in Scratch is clicked, starting the program.

How are the cat sprite's initial position coordinates determined?

The initial position of the cat sprite is set using the X and Y coordinates, which are taken from the visible coordinate axes in Scratch, with X indicating horizontal position and Y indicating vertical position.

What does the 'forever' block do in the Scratch program?

The 'forever' block ensures that the actions inside it keep repeating indefinitely while the game is running, creating a loop that continuously moves the cat sprite.

What is the purpose of the 'custom block' in the program?

The 'custom block' is used to simplify the coding process by grouping multiple blocks of code into one block, making the program easier to manage and reuse.

Why are the arrow keys used to control the cat sprite's movement?

The arrow keys are used to control the cat sprite's movement to make the game interactive, allowing the player to move the cat sprite in different directions using the keyboard.

How is the cat sprite made to move to the right and left in the program?

The cat sprite is programmed to move right when the right arrow key is pressed and to move left when the left arrow key is pressed. The movement is achieved by changing the X position of the sprite.

What is the significance of the 'point in direction' block in controlling the cat sprite?

The 'point in direction' block adjusts the orientation of the cat sprite to face the correct direction, either to the right or left, depending on the user's input.

How does the program prevent the cat sprite from crossing the black lines in the maze?

The program uses a conditional 'if' block with the 'touching color' sensing block to detect if the cat sprite touches the black line, and then it moves the sprite back, preventing it from crossing the line.