src/net/habraun/kong/Ball.scala

   1 /*
   2         Copyright (c) 2008, 2009 Hanno Braun <hanno@habraun.net>
   3
   4         Licensed under the Apache License, Version 2.0 (the "License");
   5         you may not use this file except in compliance with the License.
   6         You may obtain a copy of the License at
   7
   8                 http://www.apache.org/licenses/LICENSE-2.0
   9
  10         Unless required by applicable law or agreed to in writing, software
  11         distributed under the License is distributed on an "AS IS" BASIS,
  12         WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13         See the License for the specific language governing permissions and
  14         limitations under the License.
  15 */
  16
  17
  18
  19 package net.habraun.kong
  20
  21
  22
  23 import net.phys2d.math._
  24 import net.phys2d.raw._
  25 import net.phys2d.raw.shapes._
  26
  27
  28
  29 class Ball(startingX: Int, startingY: Int) {
  30
  31         private val r = new Random
  32
  33         val body = new Body(new Circle(Ball.radius), Ball.mass)
  34         body.setDamping(0)
  35         body.setFriction(0)
  36         body.setRestitution(1)
  37         body.setRotatable(false)
  38         body.setMaxVelocity(400, 400)
  39
  40
  41
  42         def init {
  43                 val mod = (r: Random) => (r.nextInt(2) + 1) * 2 - 3 // result: -1 or +1
  44                 val vel = (r: Random, min: Int, factor: Float) => (r.nextInt(101) + min) * factor
  45
  46                 val xMod = mod(r)
  47                 val yMod = mod(r)
  48                 val xVel = xMod * vel(r, 100, 3)
  49                 val yVel = yMod * vel(r, 0, 2)
  50
  51                 body.adjustVelocity(new Vector2f(body.getVelocity).negate)
  52                 body.adjustVelocity(new Vector2f(xVel, yVel))
  53                 body.setPosition(startingX, startingY)
  54         }
  55 }
  56
  57
  58
  59 object Ball {
  60         val radius = 5
  61         val mass = 1
  62 }