Double Key Press?

ID:951143
 
Aug 28 2012, 8:51 am
Keywords: double, key, press, tap
(See the best response by GreatFisher.)
Hi guys, is it possible to check if the player has pressed the key twice in a row? I'm trying to incorporate a 'dash' feature where it throws the player forward when they double-press a key.

Is there a built in proc or something for this? If not, what's the most efficient way to code one?

Thanks
Aug 28 2012, 8:54 am
Best response
You could use Forum_Account's keyboard library, make a variable to store the last key pressed and check it against the next key pressed. You could then possibly make a proc called double press or something like that to handle the behavior of that double press. You may also want to reset the variable to null after like a second.
Aug 28 2012, 10:50 am
Okay thanks that worked. Atm I've got:

            var/d = 0
            var/last_key

            if(keys["north"]) 
                d |= NORTH
                last_key = "north"
                if(last_key == "north")
                    src << "double press"
                    last_key = "reset"

            step(mob, d)
            spawn(10) 
                if(last_key == "reset")
                    last_key = "reset"
                    src<<"[last_key]"


It works fine, the problem is if the user holds the same key down, it counts it as them pressing it again instead.

Could someone write me a code to check if the key is being held down? Don't add it into my code please, I'd rather learn myself.

Thanks
Aug 28 2012, 11:22 am
Keep a list of keys held. On KeyDown, add the key to the list. Take it out on KeyUp.
Aug 28 2012, 11:36 am
Thanks I'll try that out.
Aug 29 2012, 9:27 am
Using Forum_account's Keyboard library, you have access to the key_down() and key_up() events. For double-tapping, you really only need to worry about key_down(), but it depends on what you mean by double-tapping. Here's what I've done:
mob
    var
        tmp
            last_key        //  What key was pressed?
            double_tap_time //  When should it be pressed again to count as a double-tap?
            double_tap_sensitivity = 2  // How long can you take? 

    key_down(key)
        if(last_key == key && world.time < double_tap_time)
            double_tap(key)

        else
            last_key = key
            double_tap_time = world.time + double_tap_sensitivity
        ..()

    proc/double_tap(key)
        src << "You double-tapped [key]!"

The key-downs of a key must happen no more than 1/5th of a second apart. The double_tap(key) event is triggered when a successful double-tap has been performed.
Sep 8 2012, 5:33 am
Thanks that worked great.