疾光电影：一条电光穿一串

SL:DrawLightning(x1, y1, x2, y2, { jitter = 10, layer = 2 })

fx-linebolt

local LineBolt = {}
local KEY = { CHARGE = 0.55, LIFE = 0.3 }

local function BuildBolt(x1, y1, x2, y2, seg)
    local pts = { { x = x1, y = y1 } }
    for i = 1, seg do
        local t = i / (seg + 1)
        local mx = x1 + (x2 - x1) * t
        local my = y1 + (y2 - y1) * t
        -- 垂直方向随机偏移, 主干仍然笔直
        local nx, ny = (y2 - y1), -(x2 - x1)
        local len = math.sqrt(nx * nx + ny * ny)
        local amp = math.random(-5, 5)
        pts[#pts + 1] = { x = mx + nx / len * amp, y = my + ny / len * amp }
    end
    pts[#pts + 1] = { x = x2, y = y2 }
    return pts
end

function LineBolt.Cast(self_, targets)
    SL:PlayActorAct(self_, "cast")
    -- 预警虚线
    SL:PlayGroundFx("aim_line", SL:GetValue("aimY"), KEY.CHARGE)
    SL:ScheduleOnce(function()
        local x1 = SL:GetValue("actorX", self_) + 22
        local y1 = SL:GetValue("actorY", self_) - 56
        local pts = BuildBolt(x1, y1, 660, y1, 16)
        SL:DrawLightningPts(pts, { layer = 2, width = SL:GetValue("boltWidth") })
        SL:ScreenShake(0.26, 5)
        -- 沿线同帧结算
        for _, t in ipairs(targets) do
            SL:DeductHp(t, 31)
            SL:ShowHitNum(t, 31, "bolt")
            SL:PlayBurst(SL:GetValue("actorX", t),
                         SL:GetValue("actorY", t) - 58, "violet", 16)
            SL:PlayActorAct(t, "stuck")
        end
        SL:ScheduleOnce(function()
            SL:ClearLightning()
        end, KEY.LIFE)
    end, KEY.CHARGE)
end

return LineBolt