var screen_width = Math.round(Global.GetScreenSize()[0]);
var screen_length = Math.round(Global.GetScreenSize()[1]);
function HSVtoRGB(h, s, v)
{
    var r, g, b, i, f, p, q, t;

    i = Math.floor(h * 6);
    f = h * 6 - i;
    p = v * (1 - s);
    q = v * (1 - f * s);
    t = v * (1 - (1 - f) * s);

    switch (i % 6)
    {
        case 0: r = v, g = t, b = p; break;
        case 1: r = q, g = v, b = p; break;
        case 2: r = p, g = v, b = t; break;
        case 3: r = p, g = q, b = v; break;
        case 4: r = t, g = p, b = v; break;
        case 5: r = v, g = p, b = q; break;
    }

    return { r: Math.round(r * 255), g: Math.round(g * 255), b: Math.round(b * 255) };
}

function onDrawEvent()
{
    var colors = HSVtoRGB(Global.Realtime() * UI.GetValue("Misc", "JAVASCRIPT", "Script items", "Rainbow Line Speed"), 1, 1);
    //up
    Render.GradientRect(0, 0, screen_width/2, 5, 1, [colors.g, colors.b, colors.r, 255], [colors.r, colors.g, colors.b, 255]);
    Render.GradientRect(screen_width/2, 0, screen_width/2, 5, 1, [colors.r, colors.g, colors.b, 255], [colors.b, colors.r, colors.g, 255]);
    //left
    Render.GradientRect(0, 0, 5, screen_length, 0, [colors.g, colors.b, colors.r, 255], [colors.r, colors.g, colors.b, 255]);
    //right
    Render.GradientRect(screen_width-5, 0, 5, screen_length, 0, [colors.b, colors.r, colors.g, 255], [colors.g, colors.b, colors.r, 255]);
    //down
    Render.GradientRect(screen_width/2, screen_length-5, screen_width/2, 5, 1, [colors.b, colors.r, colors.g, 255], [colors.g, colors.b, colors.r, 255]);
    Render.GradientRect(0, screen_length-5, screen_width/2, 5, 1, [colors.r, colors.g, colors.b, 255], [colors.b, colors.r, colors.g, 255]);
}

Global.RegisterCallback("Draw", "onDrawEvent");
UI.AddSliderFloat("Rainbow Line Speed", 0.01, 1.0);
UI.SetValue("Misc", "JAVASCRIPT", "Script items", "Rainbow Line Speed", 0.1);