nimcity/src/pong/player.nim

import sdl2

import ../cons

type
    EPlayer {.pure.}= enum
        Human,
        Robot

    Player* {.requiresInit.} = object
        x: float32
        y: float32
        renderer: RendererPtr
        case kind*: EPlayer
        of Human:
            name:string # у человека есть имя
        of Robot:
            id*: int # пример уникального поля для бота

proc NewHuman*(x: float32=0, name:string="user", renderer:RendererPtr): Player =
    assert(name!="", "NewHuman(): name is empty")
    Player(
        kind:Human,
        x: x,
        y: (WindowHeight + PaddleHeight) / 2,
        renderer:renderer,
        name:name,
    )

proc NewRobot*(x: float32=0, renderer:RendererPtr): Player =
    Player(
        kind:Robot,
        x: x,
        y: (WindowHeight + PaddleHeight) / 2,
        renderer:renderer,
        id:100,
    )

proc Stop*(sf:Player)=
    discard

proc update*(sf:var Player, dy, ballY: float32) =
    let speed=300.0
    if ballY>sf.y:
        sf.y = sf.y + dy*speed
    else:
        sf.y = sf.y - dy*speed
    sf.y = max(sf.y, 0)
    sf.y = min(sf.y, WindowHeight - PaddleHeight)
    echo("ballY=", $ballY, " robotY=", $sf.y, " dy=", $dy)

proc update*(sf:var Player, dt: float32)=
    discard


proc draw*(sf: Player) =
    case sf.kind:
    of Human:
        sf.renderer.setDrawColor 255, 0, 0, 255 # red
    of Robot:
        sf.renderer.setDrawColor 0, 0, 255, 255 # blue
    var r = rect(
        cint(sf.x), cint(sf.y),
        cint(PaddleWidth), cint(PaddleHeight)
    )
    sf.renderer.fillRect(r)

proc `x`*(sf:Player):float32{.inline.}=
    return sf.x

proc `y`*(sf:Player):float32{.inline.}=
    return sf.y

proc `y=`*(sf:var Player, val:float32){.inline.}=
    sf.y=val

proc control(sf:var Player){.inline.}=
    if sf.y < 0:
        sf.y=0
    elif sf.y + PaddleHeight > WindowHeight:
        sf.y = WindowHeight - PaddleHeight

proc Down*(sf:var Player, dt:float32){.inline.}=
    # echo("Human.Down(): dt=", (dt*1000).int, " msec")
    sf.y -= PaddleSpeed * dt
    sf.control()

proc Up*(sf:var Player, dt:float32){.inline.}=
    # echo("Human.Up(): dt=", (dt*1000).int, " msec")
    sf.y += PaddleSpeed * dt
    sf.control()