_Curve

local curve = _Curve.new()
curve:addPoint(_Vector2.new( 0,20 ))
curve:addPoint(_Vector2.new( 50,10 ))
curve:addPoint(_Vector2.new( 60,10 ))
curve:addPoint(_Vector2.new( 80,50 ))
curve:addPoint(_Vector2.new( 100,60 ))
curve:addPoint(_Vector2.new( 150,100 ))

_app:onIdle(function(e)
    curve:draw( 100, 100, _Color.White )
end)

_app:onKeyDown(function(key)
if key == _System.Key1 then
        curve.type = _Curve.Straight
    elseif key == _System.Key2 then
        curve.type = _Curve.Hermite
    elseif key == _System.KeyA then
        local point = curve:getValue( 0.5 )
    print( '0.5Value:', point.x, point.y)
    elseif key == _System.KeyS then
        local point = curve:getPoint(2)
        print( '2Point:', point.x, point.y)
    elseif key == _System.KeyD then
        local points = curve:getPoints()
        print( '#Points:', #points)
    end
end)