import from local directory

1 files changed, 32 insertions, 0 deletions

diff --git a/src/main/scala/sims/collision/Polygon.scala b/src/main/scala/sims/collision/Polygon.scala
new file mode 100644
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+++ b/src/main/scala/sims/collision/Polygon.scala
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+/*    _____ _ __  ________    ___                                      *\
+**   / ___/(_)  |/  / ___/   |__ \  Simple Mechanics Simulator 2       **
+**   \__ \/ / /|_/ /\__ \    __/ /  copyright (c) 2011 Jakob Odersky   **
+**  ___/ / / /  / /___/ /   / __/                                      **
+** /____/_/_/  /_//____/   /____/                                      **
+\*                                                                     */
+
+package sims.collision
+
+import sims.math._
+
+/**Common properties of all polygons.*/
+trait Polygon extends Collidable {
+	
+	/**Returns positions of all vertices of this Polygon. Vertices are ordered counter-clockwise.
+   * @return position vectors of the vertices*/
+  def vertices: Seq[Vector2D]
+  
+  /**Returns all sides of this polygon. The sides are ordered counter-clockwise, the first vertex of the side
+   * giving the side index.*/
+  def sides: Seq[Segment] = for (i <- 0 until vertices.length) yield (new Segment(vertices(i), vertices((i + 1) % vertices.length)))
+  
+  /**Returns this polygon's axis aligned bounding box.
+   * @see collision.AABB*/
+  override def aabb = {
+    val xs = vertices.view map (_.x)
+    val ys = vertices.view map (_.y)
+    new AABB(Vector2D(xs.min, ys.min),
+             Vector2D(xs.max, ys.max))
+  }
+
+}
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