luapoly/test_poly.lua at master · spoonless/luapoly · GitHub

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--[[

luapoly by David Gayerie

]]--

local LuaUnit = require "luaunit"
local new_poly = require "poly"

TestPoly = {}

function TestPoly:test_push_pop_coord()
  poly = new_poly()

  poly:push_coord(1,2)

  assert_equals(poly:get_coord_count(), 1)
  assert_equals(poly, {1,2})

  x, y = poly:get_coord(1)
  assert_equals(x, 1)
  assert_equals(y, 2)

  poly:pop_coord()
  assert_equals(poly, {})
end

function TestPoly:test_revert_winding()
  poly = new_poly{0,0,1,1,1,0,0,0}

  assert(poly:is_cw())

  poly:revert_winding()

  assert(not poly:is_cw())
  assert_equals(poly, {0,0,1,0,1,1,0,0})
end

function TestPoly:test_revert_winding_when_poly_not_closed()
  poly = new_poly{0,0,1,1,1,0}

  poly:revert_winding()

  assert_equals(poly, {0,0,1,0,1,1})
end

function TestPoly:test_close_poly()
  poly = new_poly{0,0,1,0,1,1}

  assert(not poly:is_closed())

  poly:close()
  assert(poly:is_closed())
  assert_equals(poly:get_coord(4), poly:get_coord(1))
end

function TestPoly:test_is_convex()
  poly = new_poly{0,0,1,0,1,1}

  assert(not poly:is_convex())

  poly:close()

  assert(poly:is_convex())
end

function TestPoly:test_is_not_convex()
  poly = new_poly{0,0,1,0,1,1,.6,.5}

  assert(not poly:is_convex())

  poly:close()

  assert(not poly:is_convex())
end

function TestPoly:test_is_cw()
  poly = new_poly{0,0,1,1,1,0}
  poly:close()

  assert(poly:is_cw())
end

function TestPoly:test_is_ccw()
  poly = new_poly{0,0,1,0,1,1}
  poly:close()

  assert(not poly:is_cw())
end

function TestPoly:test_get_triangles_when_poly_is_triangle()
  poly = new_poly{0,0,1,1,1,0}
  poly:close()

  local triangles = poly:get_triangles()
  assert_equals(triangles, {{3,1,2}})
end

function TestPoly:test_get_triangles_when_poly_is_convex()
  poly = new_poly{0,0,0,1,1,1,1,0}
  poly:close()

  local triangles = poly:get_triangles()
  assert_equals(triangles, {{4,1,2},{3,4,2}})
end

function TestPoly:test_get_triangles_when_poly_is_concave()
  poly = new_poly{0,0,.5,.2,1,1,1,0}
  poly:close()

  local triangles = poly:get_triangles()
  assert_equals(triangles, {{4,1,2},{2,3,4}})
end

function TestPoly:test_get_triangles_when_poly_is_star()
  poly = new_poly{-.5,.5,0,5,.5,.5,5,0,.5,-.5,0,-5,-.5,-.5,-5,0}
  poly:close()

  local triangles = poly:get_triangles()
  assert_equals(triangles, {{7,8,1},{5,6,7},{4,5,7},{7,1,2},{7,2,3},{3,4,7}})
end

TestIndexedPoly = {}

function TestIndexedPoly:test_indexed_poly()
  indexed_poly = IndexedPoly.new(5)

  assert_equals(indexed_poly:previous(1), 5)
  assert_equals(indexed_poly:next(1), 2)

  assert_equals(indexed_poly:previous(2), 1)
  assert_equals(indexed_poly:next(2), 3)

  assert_equals(indexed_poly:previous(3), 2)
  assert_equals(indexed_poly:next(3), 4)

  assert_equals(indexed_poly:previous(4), 3)
  assert_equals(indexed_poly:next(4), 5)

  assert_equals(indexed_poly:previous(5), 4)
  assert_equals(indexed_poly:next(5), 1)

  indexed_poly:remove(1)

  assert_equals(indexed_poly:previous(2), 5)
  assert_equals(indexed_poly:next(2), 3)

  assert_equals(indexed_poly:previous(3), 2)
  assert_equals(indexed_poly:next(3), 4)

  assert_equals(indexed_poly:previous(4), 3)
  assert_equals(indexed_poly:next(4), 5)

  assert_equals(indexed_poly:previous(5), 4)
  assert_equals(indexed_poly:next(5), 2)
end

function TestIndexedPoly:test_get_triangle()
  indexed_poly = IndexedPoly.new(5)

  assert_equals(indexed_poly:get_triangle(1), {5,1,2})
  assert_equals(indexed_poly:get_triangle(-1), {3,4,5})
end

LuaUnit:run()