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app.elm
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app.elm
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module Main exposing (..)
import Html exposing (Html,div,fieldset,label,input,button)
import Html.App as App
import Html.Events exposing (onClick)
import Svg exposing (..)
import Svg.Attributes exposing (..)
import Mouse exposing (..)
import List exposing (foldr,intersperse,map)
main : Program Never
main =
App.program
{ init = init
, view = view
, update = update
, subscriptions = subs
}
type Action =
CircleCenter
| CircleRadius
| DrawPolygon
type alias CircleSpec = {
center : Mouse.Position
, radius : Int
}
type alias Model = {
positions : List Mouse.Position
, currentAction : Action
, currentCircleSpec : CircleSpec
, circles : List CircleSpec
}
type ObjectType =
Polygon
| Circle
type Msg =
NoOp
| MouseMsg Mouse.Position
| SwitchTo ObjectType
| Clear
init : (Model, Cmd Msg)
init = (Model [] CircleCenter (CircleSpec {x=0,y=0} 0) [], Cmd.none)
update : Msg -> Model -> (Model, Cmd Msg)
update msg model =
case msg of
MouseMsg pos ->
case model.currentAction of
CircleCenter ->
if (pos.x <= 500 && pos.y <= 500)
then
let
newCircleSpec = CircleSpec pos 0
m = { model | currentCircleSpec = newCircleSpec }
in
({ m
| currentAction = CircleRadius
}
, Cmd.none)
else
(model, Cmd.none)
CircleRadius ->
let
c = model.currentCircleSpec
newCircleSpec = { c | radius = (distance pos c.center) }
m = { model | currentAction = CircleCenter }
in
({ m
| circles = model.circles ++ [newCircleSpec]
}
, Cmd.none)
DrawPolygon ->
({ model
| positions = model.positions ++ [pos]
}
, Cmd.none)
SwitchTo Circle ->
({ model
| currentAction = CircleCenter
}
, Cmd.none)
SwitchTo Polygon ->
({ model
| currentAction = DrawPolygon
}
, Cmd.none)
Clear ->
let
m = { model | positions = [] }
m2 = { m | circles = [] }
in
( m2
, Cmd.none
)
NoOp ->
(model
, Cmd.none)
distance : Mouse.Position -> Mouse.Position -> Int
distance pos1 pos2 =
let
xd = abs ((toFloat pos1.x) - (toFloat pos2.x))
yd = abs ((toFloat pos1.y) - (toFloat pos2.y))
in
truncate (sqrt (((*) xd xd) + ((*) yd yd)))
subs : Model -> Sub Msg
subs _ = Sub.batch [Mouse.clicks MouseMsg]
view : Model -> Html Msg
view model =
let
drawBlackPoint = drawPoint "#000000"
drawOrangePolygon = drawPolygon "#F0AD00"
middlePoint = case model.currentAction of
CircleRadius ->
let
point = model.currentCircleSpec.center
x' = (/) (toFloat point.x) 1
y' = (/) (toFloat point.y) 1
in
[drawPoint "#FF0000" (truncate x') (truncate y')]
_ -> []
in
div
[]
[ svg
[ width "500"
, height "500"
, viewBox "0 0 500 500"
]
(
[ drawOrangePolygon model.positions
]
++
(List.concat (map (\c -> drawCircle c) model.circles))
++
middlePoint
)
, fieldset
[]
[
--radio "Polygon" (SwitchTo Polygon)
--, radio "Circle" (SwitchTo Circle)
--,
button [onClick Clear] [text "Clear"]
]
]
drawCircle : CircleSpec -> List (Svg msg)
drawCircle circle' =
let
x = circle'.center.x
y = circle'.center.y
radius = circle'.radius
in
dc x y radius 0 0
dc : Int -> Int -> Int -> Int -> Int -> List (Svg msg)
dc x0 y0 x y err =
let
points =
[drawPoint "#000000" (x0 + x) (y0 + y)] ++
[drawPoint "#000000" (x0 + y) (y0 + x)] ++
[drawPoint "#000000" (x0 - y) (y0 + x)] ++
[drawPoint "#000000" (x0 - x) (y0 + y)] ++
[drawPoint "#000000" (x0 - x) (y0 - y)] ++
[drawPoint "#000000" (x0 - y) (y0 - x)] ++
[drawPoint "#000000" (x0 + y) (y0 - x)] ++
[drawPoint "#000000" (x0 + x) (y0 - y)]
y' = y + 5
err' = err + (1 + ((*) y 2))
in
if (x+5 < y')
then
[]
else
if (((*) 2 (err' - x)) + 1 > 0)
then
points ++ (dc x0 y0 (x-5) y' (err' + (1 - ((*) 2 x))))
else
points ++ (dc x0 y0 x y' err')
drawCircle' : CircleSpec -> Svg msg
drawCircle' circle' =
circle
[ cx (toString circle'.center.x)
, cy (toString circle'.center.y)
, r (toString circle'.radius)
]
[
]
radio : String -> msg -> Html msg
radio value msg =
label
[
]
[ input [ type' "radio", name "font-size", onClick msg ] []
, text value
]
drawPolygon : String -> List Mouse.Position -> Svg msg
drawPolygon color' positions =
polygon
[ fill color'
, points (pointsToSvgString positions)
]
[]
drawPoint : String -> Int -> Int -> Svg msg
drawPoint color' x' y' =
rect
[fill color'
, x (toString ((*) x' 1))
, y (toString ((*) y' 1))
, width "5", height "5"
]
[]
pointsToSvgString : List Mouse.Position -> String
pointsToSvgString positions =
let
stringMapper = (\n -> (toString n.x) ++ "," ++ (toString n.y))
listOfStrings = List.map stringMapper positions
interspersedStrings = List.intersperse " " listOfStrings
in
foldr (++) "" interspersedStrings