player = {
  x = 100,
  y = 100,
  angle = 0
}
speed = 200

function love.load()
end

function love.update(dt)
    if love.keyboard.isDown("space") then
        player.x = player.x + dt * math.sin(player.angle) * speed
        player.y = player.y - dt * math.cos(player.angle) * speed
    end
    if love.keyboard.isDown("left") then
        player.angle = player.angle - dt
    elseif love.keyboard.isDown("right") then
        player.angle = player.angle + dt
    end
end

FRONT_SIZE = 20
BACK_SIZE = 20
ship_shape = {
  0, -FRONT_SIZE,
  -10, BACK_SIZE,
  10, BACK_SIZE
}

function love.draw()
  love.graphics.setColor(0, 0.6, 0.0)
  love.graphics.push()
  love.graphics.translate(player.x, player.y)
  love.graphics.rotate(player.angle)
  love.graphics.polygon('line', ship_shape)
  love.graphics.pop()
end