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Eduardo Gurgel 2017-03-18 16:53:48 +13:00
parent 40ffbe9c7c
commit 5038d26bf9
2 changed files with 77 additions and 2 deletions
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72
lib/vivid/slpfa.ex
View file

@ -11,6 +11,76 @@ defmodule Vivid.SLPFA do
@moduledoc false
end
@doc """
iex> use Vivid
...> frame = Frame.init(16, 16, RGBA.black)
...> polygon = Polygon.init([Point.init(1, 1), Point.init(4, 1), Point.init(4, 7), Point.init(11, 7), Point.init(11, 1), Point.init(14, 1), Point.init(14, 14), Point.init(1, 14)])
...> Frame.push(frame, polygon, RGBA.white)
...> |> to_string
" \n" <>
" @@@@@@@@@@@@@@ \n" <>
" @ @ \n" <>
" @ @ \n" <>
" @ @ \n" <>
" @ @ \n" <>
" @ @ \n" <>
" @ @ \n" <>
" @ @@@@@@@@ @ \n" <>
" @ @ @ @ \n" <>
" @ @ @ @ \n" <>
" @ @ @ @ \n" <>
" @ @ @ @ \n" <>
" @ @ @ @ \n" <>
" @@@@ @@@@ \n" <>
" \n"
iex> use Vivid
...> frame = Frame.init(16, 16, RGBA.black)
...> polygon = Polygon.init([Point.init(1, 1), Point.init(4, 1), Point.init(4, 7), Point.init(11, 7), Point.init(11, 1), Point.init(14, 1), Point.init(14, 14), Point.init(1, 14)]) |> Vivid.SLPFA.fill |> Group.init
...> Frame.push(frame, polygon, RGBA.white)
...> |> to_string
" \n" <>
" \n" <>
" @@@@@@@@@@@@ \n" <>
" @@@@@@@@@@@@ \n" <>
" @@@@@@@@@@@@ \n" <>
" @@@@@@@@@@@@ \n" <>
" @@@@@@@@@@@@ \n" <>
" @@@@@@@@@@@@ \n" <>
" @@@@@@@@@@@@ \n" <>
" @@ @@ \n" <>
" @@ @@ \n" <>
" @@ @@ \n" <>
" @@ @@ \n" <>
" @@ @@ \n" <>
" @@ @@ \n" <>
" \n"
iex> use Vivid
...> frame = Frame.init(16, 16, RGBA.black)
...> polygon = Polygon.init([Point.init(1, 1), Point.init(4, 1), Point.init(4, 7), Point.init(11, 7), Point.init(11, 1), Point.init(14, 1), Point.init(14, 14), Point.init(1, 14)])
...> inside = polygon |> Vivid.SLPFA.fill |> Group.init
...> Frame.push(frame, polygon, RGBA.white)
...> |> Frame.push(inside, RGBA.white)
...> |> to_string
" \n" <>
" @@@@@@@@@@@@@@ \n" <>
" @@@@@@@@@@@@@@ \n" <>
" @@@@@@@@@@@@@@ \n" <>
" @@@@@@@@@@@@@@ \n" <>
" @@@@@@@@@@@@@@ \n" <>
" @@@@@@@@@@@@@@ \n" <>
" @@@@@@@@@@@@@@ \n" <>
" @@@@@@@@@@@@@@ \n" <>
" @@@@ @@@@ \n" <>
" @@@@ @@@@ \n" <>
" @@@@ @@@@ \n" <>
" @@@@ @@@@ \n" <>
" @@@@ @@@@ \n" <>
" @@@@ @@@@ \n" <>
" \n"
"""
def fill(%Polygon{vertices: vertices}=polygon) do
vertices
|> create_edge_table
@ -57,7 +127,7 @@ defmodule Vivid.SLPFA do
active
|> Stream.chunk(2)
|> Enum.reduce(points, fn [a0, a1], points ->
Enum.reduce(a0.x..a1.x, points, fn x, points ->
Enum.reduce(a0.x+1..a1.x-1, points, fn x, points ->
MapSet.put(points, Point.init(x, y))
end)
end)

5
test/vivid/slpfa_test.exs Normal file
View file

@ -0,0 +1,5 @@
defmodule Vivid.SLPFATest do
use ExUnit.Case
doctest Vivid.SLPFA
end