Hands-On Game Development with Rust/

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Creating Obstacles

Creating Obstacles

Learn how to add walls as obstacles for the player.

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The other key objective of Flappy Dragon is dodging obstacles. Let’s add walls to the game, with gaps that the dragon can fly through. Begin by adding another struct to the program:

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struct Obstacle {
  x: i32,
  gap_y: i32,
  size: i32
}

Obstacles have an x value, defining their position in world-space (to match the player’s world-space x value). The gap_y variable defines the center of the gap through which the dragon may pass. size defines the length of the gap in the obstacle.

We’ll need to define a constructor for the obstacle:

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impl Obstacle {
  fn new(x: i32, score: i32) -> Self {
    let mut random = RandomNumberGenerator::new();
    Obstacle {
      x,
      gap_y: random.range(10, 40),
      size: i32::max(2, 20 - score)
    }
  }

Computers aren’t great at generating genuinely ...