Kill popup animation

-- name: Kill Popup
-- author: Adolfjon
-- version: 1.0
-- description: Animated +1 in the middle of the screen on every kill.

ui.color("col", "Colour", color(255, 255, 255))
ui.color("hs", "Headshot colour", color(255, 90, 90))

local pops = {}

local function ease_out(t) return 1 - (1 - t) ^ 3 end

function on_kill(e)
    pops[#pops + 1] = { at = globals.time(), hs = e.headshot, n = e.round_kills }
end

function on_frame()
    local w, h = draw.screen()
    local now = globals.time()
    for i = #pops, 1, -1 do
        local p = pops[i]
        local t = (now - p.at) / 1.2
        if t >= 1 then
            table.remove(pops, i)
        else
            local rise = ease_out(t) * 60
            local scale = t < 0.15 and math.lerp(10, 34, t / 0.15) or 34
            local alpha = t < 0.6 and 255 or 255 * (1 - (t - 0.6) / 0.4)
            local text = p.n > 1 and ("+" .. p.n) or "+1"
            local col = p.hs and ui.get("hs") or ui.get("col")
            local tw, th = draw.text_size(text, scale)
            draw.text_outline(w / 2 - tw / 2, h * 0.42 - rise - th / 2, text, color.alpha(col, alpha), scale)
        end
    end
end