V(v1.x+c/2, v2.y), V(v1.x+c, v2.y) }, -- TL
{ type="segment"; V(v1.x+c, v2.y), v3}, -- T
{ type="segment"; v3, v4}, -- P
{ type="segment"; v4, v5}, --P
{ type="segment"; v5, V(v2.x-c, v2.y)}, -- T
V(v1.x+c/2, v2.y), V(v1.x+c, v2.y) }, -- TL
{ type="segment"; V(v1.x+c, v2.y), v3}, -- T
{ type="segment"; v3, v4}, -- P
{ type="segment"; v4, v5}, --P
{ type="segment"; v5, V(v2.x-c, v2.y)}, -- T