1 files changed, 28 insertions, 0 deletions
diff --git a/public/assets/javascripts/rectangles/engine/shapes/polyline.js b/public/assets/javascripts/rectangles/engine/shapes/polyline.js
index 65e22ad..579d0ea 100644
--- a/public/assets/javascripts/rectangles/engine/shapes/polyline.js
+++ b/public/assets/javascripts/rectangles/engine/shapes/polyline.js
@@ -46,6 +46,32 @@ var Polyline = Fiber.extend(function(base){
 	  var clone = this.instantiate()
 	  clone.points = this.points.concat()
 	}
+	exports.getSegment = function(segment){
+	  var seg = [
+	    this.points[segment.head],
+	    this.points[segment.tail],
+	  ]
+	  if (segment.head == 0) {
+	    seg.push( this.lastPoint() )
+	  }
+	  else if (segment.tail == this.points.length-1) {
+	    seg.push( this.firstPoint() )
+	  }
+	  return seg
+	}
+	exports.cloneSegment = function(segment){
+	  return this.getSegment(segment).map(function(point){ return point.clone() })
+	}
+	exports.translateSegment = function(src, dest, dx, dy){
+    dest[0].a = src[0].a + dx
+    dest[0].b = src[0].b + dy
+    dest[1].a = src[1].a + dx
+    dest[1].b = src[1].b + dy
+    if (src.length == 3) {
+      dest[2].a = src[2].a + dx
+      dest[2].b = src[2].b + dy
+    }
+	}
 	exports.hasPointNear = function(p){
 	  var point
     for (var i = 0; i < this.points.length; i++){
@@ -156,10 +182,12 @@ var Polyline = Fiber.extend(function(base){
   exports.serialize = function(){
     return {
       type: this.type(),
+      closed: this.closed,
       points: this.points.map(function(point){ return [point.a, point.b] }),
     }
   }
   exports.deserialize = function(data){
+    this.closed = data.closed || false
     this.points = (data.points || data).map(function(point){ return new vec2(point[0], point[1]) })
   }
   exports.reset = function(){