1 files changed, 24 insertions, 0 deletions
diff --git a/src/main/scala/sims/collision/Pair.scala b/src/main/scala/sims/collision/Pair.scala
new file mode 100644
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+++ b/src/main/scala/sims/collision/Pair.scala
@@ -0,0 +1,24 @@
+/*
+ * Simple Mechanics Simulator (SiMS)
+ * copyright (c) 2009 Jakob Odersky
+ * made available under the MIT License
+*/
+
+package sims.collision
+
+import sims.dynamics._
+
+/**Pair of shapes.*/
+case class Pair(s1: Shape, s2: Shape){
+  
+  override def equals(other: Any) = { //overriden to prevent removal during "GridDetector.getPairs" 
+    other match {
+      case Pair(a, b) => ((a eq this.s1) && (b eq this.s2)) || ((b eq this.s1) && (a eq this.s2))  
+      case _ => false
+    }
+  }
+}
+
+object Pair {
+	implicit def pair2Tuple(x: Pair) = (x.s1, x.s2)
+}