diff --git a/src/cmd/test/main.go b/src/cmd/test/main.go
index 8f86070..7ccbca4 100644
--- a/src/cmd/test/main.go
+++ b/src/cmd/test/main.go
@@ -186,7 +186,8 @@ func (d *Debug) Draw(
 		keyStrs = append(keyStrs, k.String())
 	}
 	
-	if rectMove.Vertices().Contained(rect).Len() > 0 {
+	if rectMove.Vertices().Contained(rect).Len() > 0 ||
+			rect.Vertices().Contained(rectMove).Len() > 0 {
 		keyStrs = append(keyStrs, "THIS IS SHIT")
 	}
 	
diff --git a/src/gx/line.go b/src/gx/line.go
index f3c048e..aeed1a4 100644
--- a/src/gx/line.go
+++ b/src/gx/line.go
@@ -2,6 +2,7 @@ package gx
 
 import (
 	"math"
+	"fmt"
 )
 
 // The type represents mathematical equation of line and line itself.
@@ -25,7 +26,8 @@ type LineSegment [2]Point
 type LineSegments []LineSegment
 
 type Edge = LineSegment
-type Edges []Vertex
+type Edges = LineSegments
+
 
 
 // Check if two LinerPointContainers do cross and return the
@@ -120,3 +122,20 @@ func (ls LineSegment) Len() Float {
 	return math.Sqrt(ls.LenSqr())
 }
 
+func (what LineSegments) Cross(with LineSegments) ([][2]int, Points) {
+	indexes := [][2]int{}
+	points := Points{}
+	for i := range what {
+		for j := range with {
+			p, cross := LinersCross(what[i], with[j])
+			if cross {
+				fmt.Println("in")
+				points = append(points, p)
+				indexes = append(indexes, [2]int{i, j})
+			}
+		}
+	}
+	
+	return indexes, points
+}
+
diff --git a/src/gx/polygon.go b/src/gx/polygon.go
new file mode 100644
index 0000000..154060e
--- /dev/null
+++ b/src/gx/polygon.go
@@ -0,0 +1,16 @@
+package gx
+
+// The type represents polygons.
+// Fuck. The package gets too big.
+// Should split it somehow.
+type Polygon []Point
+
+func (p Polygon) Edges() Edges {
+	ret := Edges{}
+	/*for i := range p {
+		ret = append(ret, Edge{})
+	}*/
+	
+	return ret
+}
+
diff --git a/src/gx/rect.go b/src/gx/rect.go
index d99bb14..c265803 100644
--- a/src/gx/rect.go
+++ b/src/gx/rect.go
@@ -38,13 +38,13 @@ func (r Rectangle) Vertices() Points {
 	return Points{p1, p2, p3, p4}
 }
 
-func (r Rectangle) Edges() LineSegments {
+func (r Rectangle) Edges() Edges {
 	vs := r.Vertices()
 	return LineSegments{
 		LineSegment{vs[0], vs[1]},
 		LineSegment{vs[1], vs[2]},
 		LineSegment{vs[2], vs[3]},
-		LineSegment{vs[4], vs[0]},
+		LineSegment{vs[3], vs[0]},
 	}
 }