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HTML

<script src="https://dl.dropboxusercontent.com/u/20969924/Code/matter.js"></script>
<script src="https://dl.dropboxusercontent.com/u/20969924/Code/decomp.js"></script>

CoffeeScript

Body = Matter.Body
World = Matter.World
Engine = Matter.Engine
Bodies = Matter.Bodies
Vertices = Matter.Vertices

engine = Engine.create document.body
engine.world.gravity.y = 0
engine.world.frictionAir = 0

path_wall = '-50 50, -50 -50, 50 -50, 50 50'
path_cornerSharp = '50 -50, -50 -50, -50 50'
path_cornerRoundOuter = '50 -50, 48.48077392578125 -32.63518142700195, 43.969261169433594 -15.797986030578613, 36.6025390625 0, 26.60444450378418 14.27876091003418, 14.27876091003418 26.60444450378418, 0 36.6025390625, -15.797986030578613 43.969261169433594, -32.63518142700195 48.48077392578125, -50 50, -50 -50, '

vertices_wall = Vertices.fromPath path_wall
vertices_cornerSharp = Vertices.fromPath path_cornerSharp
vertices_cornerRoundOuter = Vertices.fromPath path_cornerRoundOuter

xOffset = 100
yOffset = 100

wall = Bodies.fromVertices xOffset, yOffset, vertices_wall
cornerSharp = Bodies.fromVertices xOffset, yOffset, vertices_cornerSharp
cornerRoundOuter = Bodies.fromVertices xOffset, yOffset, vertices_cornerRoundOuter

wall.isStatic = true
cornerSharp.isStatic = true
cornerRoundOuter.isStatic = true

World.add engine.world, wall
World.add engine.world, cornerSharp
World.add engine.world, cornerRoundOuter

Engine.run engine