processing と scala で弾をまっすぐ飛ばすサンプル

main.scala

import processing.core._

object Main extends processing.core.PApplet {
  import PConstants._

  val pos = new PVector()

  val bullets = scala.collection.mutable.ArrayBuffer[PVector]()
    
  override def setup() {
    size(800, 400)
  }

  override def draw() {
    background(0, 0, 0)

    pos.x = mouseX
    pos.y = mouseY    
    
    fill(255, 0, 0)
    ellipseMode(CENTER)
    ellipse(pos.x, pos.y, 30, 30)

    bullets foreach {
      b =>
      b.y -= 20
      
      fill(255, 255, 0)      
      ellipse(b.x, b.y, 15, 15)
    }  
  }

  override def mousePressed() {
    bullets += new PVector(pos.x, pos.y)
  }
  
  def main(args: Array[String]) = runSketch()
}