How do you make it so if you hold down the button, a blast gets larger and does more damage??

Hi Tim,

What you're trying to accomplish is simple and the answer previous to this by chexy doesn't answer your question.You want the blast to keep growing when you keep holding down the key, and you need to use booleans for that. You make a boolean true upon clicking, and make it false upon ending the click. And while the boolean is true, you need to run a function that increases the size. Here, I'll just show you how to do it using UserInputService.

local uis = game:GetService("UserInputService");
local players = game:GetService("Players");
local player = players.LocalPlayer;
local holding_down = false;

uis.InputBegan:Connect(function(obj, gp)
    if obj.KeyCode == Enum.KeyCode.Q and not gp then
        holding_down = true;
        local part; -- Define the part somehow and I'm going to assume this part's had it's appropriate properties set.

        while holding_down and wait() do
            part.Size = part.Size + Vector3.new(.1, .1, .1); -- Adds this to the size while the key is being held.
        end
    end
end)

uis.InputEnded:Connect(function(obj, gp)
    if obj.KeyCode == Enum.KeyCode.Q and not gp then
        holding_down = false;
    end
end)

Well, I hope I helped and have a wonderful day/night.

Thanks,

Best regards,

~~ KingLoneCat

You can use UserInputService or ContextActionService for keybinding. Here's to start you off; This is a LocalScript:

local uis = game:GetService('UserInputService')

uis.InputBegan:Connect(function(key, gpe)
        -- When a key is pressed, this event is fired
        if key.KeyCode == Enum.KeyCode.F then --A check to see if the player pressed the 'F' key
               -- increase dmg and size of fireball
        end
end)

uis.InputEnded:Connect(function(key, gpe) then
       -- If a player has let go of a key, this event is fired.
       if key.KeyCode == Enum.KeyCode.F then --A check to see if the 'F' key was let go of
              -- Release the fireball and deal some damage to the player it hit, if it has
       end
end