tetris jetpackcompose game

Tetris Jetpackcompose Game

Tetris Game Documentation

• This forms an overview, that summarizes key aspects in the Tetris game.

1. Project Setup

• Dependencies: Ensure that your project is using Jetpack Compose with the required libraries in build.gradle:

  implementation "androidx.compose.ui:ui:1.x.x"
  implementation "androidx.compose.material:material:1.x.x"
  implementation "androidx.compose.ui:ui-tooling:1.x.x"
  implementation "androidx.lifecycle:lifecycle-runtime-ktx:2.x.x"

2. Game Components

• Grid Setup: Define a grid that represents the Tetris board. Use a 2D array or list of lists to track the game state (e.g., filled, empty, block color).

  val grid = Array(20) { Array(10) { 0 } } // 20 rows, 10 columns

• Tetrimino Shapes: Create different block shapes (L, T, I, O, etc.) using 2D arrays. Each block can have rotation states that update as the player rotates the piece.

  val blockI = arrayOf(
      arrayOf(1, 1, 1, 1),
      arrayOf(0, 0, 0, 0)
  )

3. Game Loop

• Use LaunchedEffect with rememberCoroutineScope to create a game loop that controls the game state (block movement, rotation, collision detection, etc.).

LaunchedEffect(Unit) {
    while (true) {
        delay(500L) // Control block speed
        moveBlockDown()
    }
}

4. Rendering the Grid

• Render the Tetris grid using Canvas or Box composables. Each block on the grid can be a colored square.

  Canvas(modifier = Modifier.size(300.dp)) {
      for (row in grid) {
          for (cell in row) {
              if (cell != 0) {
                  drawRect(color = Color.Blue, size = Size(30f, 30f))
              }
          }
      }
  }

5. User Input

• Handle user inputs (left, right, down, rotate) using Modifier.pointerInput or by mapping to hardware buttons like arrow keys.

  Modifier.pointerInput(Unit) {
      detectTapGestures(onDoubleTap = { rotateBlock() })
  }

6. Game Logic

• Collision Detection: Implement logic to detect collisions when a block reaches the bottom or hits another block.
• Line Clearing: Detect full rows, clear them, and drop the above blocks.

  fun clearLines() {
      for (i in grid.indices) {
          if (grid[i].all { it != 0 }) {
              grid.removeAt(i)
              grid.add(0, Array(10) { 0 })
          }
      }
  }

7. Score Tracking

• Keep track of score based on the number of lines cleared. You can display the score using Text composables.

8. State Management

• Use remember and MutableState to manage game state (current block position, grid, score).

  var score by remember { mutableStateOf(0) }

9. Game Over

• Check for a "game over" condition when a new block cannot be placed, then reset or stop the game.

Key Considerations:

• Responsive UI: Use flexible sizing with Modifier.size() to ensure the game looks good across different screen sizes.
• Animations: Jetpack Compose's animation APIs can be used for smoother transitions (e.g., block movements).

Read More On Medium

Extra Articles

Project Time by Wakatime