Light and Darkness (with Turf Changes) in Developer Help

ID:155859
 
Feb 28 2011, 6:17 pm
I am aware that you can set luminosity and so forth and have the map go 'black' in areas you cannot see and surround the player with their field of view - or have an object emit light and have similar aura/field of view.

However, what if you wish to have turf change states instead of simply being black. If I want both a 'Dark' and 'Light' version of a TURF to change with that field of view?

I have created something that does this. However its not perfect, and I am thinking there must be a better way...

turf
        FLOOR
            L1/icon_state       = "Stone_1"
            L2/icon_state       = "Stone_2"
            L3/icon_state       = "Stone_3"
            L4/icon_state       = "Stone_4"
            L5/icon_state       = "Stone_5"
            L6/icon_state       = "Stone_6"

            Entered(atom/M) // Something walked on the turf!
                ..()

                if(icon_state == initial(icon_state)) icon_state = "[icon_state]_L" // Set its icon_state to its original icon_state +_L (the LIGHT version)

                for(var/turf/FLOOR/STONE/S in view(4,src))
                    if(S.icon_state == initial(S.icon_state)) S.icon_state = "[S.icon_state]_L"  // Check 4 tiles around it and set those icon_states to +_L as well

                return

            Exited(atom/M) // Something stepped off the turf
                ..()

                if(icon_state != initial(icon_state)) icon_state = initial(icon_state) // Reset the turfs icon_state back to its initial value

                for(var/turf/FLOOR/STONE/S in view(4,src))
                    if(S.icon_state != initial(S.icon_state)) S.icon_state = initial(S.icon_state)  // Reset the turfs around it in a 4 tile radius back to its initial value

                return


The main issues are, that if two mobs walk towards each other it clashs and the turf will be set to dark/light.

The field of view is not constant.

I want it to behave like the luminosity. You would walk towards a player and their aura would merge with yours. I guess I *could* set some sort of mob reference in the turf so only the original mob can set it back to darkness, which in theory should stop that problem.

However, is there a better way I am overlooking? I have not really had the need for such functions before, and not I am playing around a little and would like to know what other ways there might be to do this - especially if those ways are better and more functional :)
#1 Feb 28 2011, 6:25 pm
Try taking a look at Shadowdarke's sd_DAL library: http://www.byond.com/developer/Shadowdarke/ sd_DynamicAreaLighting

It can do pretty much everything you're asking for. Even if you decide not to use the library itself, you can look at how Shadowdarke went about doing lighting.
#2 Mar 1 2011, 9:27 am (Edited on Mar 1 2011, 9:57 am)
In response to Skyspark (#1)
That's quite a comprehensive lib. I decided it was really too complex for the simple task I wanted, though def useful thanks.

turf
    STONE

        icon = 'floor.dmi'

        icon_state = "DARK"
        luminosity = 0

        var/atom/lightsrc

        Entered(atom/A)

            for(var/turf/STONE/T in view(A.luminosity-2,src)) if(!T.lightsrc)

                if(T.icon_state == initial(T.icon_state))

                    T.icon_state    = "LIGHT"
                    T.lightsrc      = A
            return

        Exited(atom/A)

            for(var/turf/STONE/T in view(A.luminosity-2,src)) if(T.lightsrc == A)

                if(T.icon_state != initial(T.icon_state))

                    T.icon_state    = initial(icon_state)
                    T.lightsrc      = null

            return


Seem's to work quite well. Leaving a nice little 'dark' turf just before total blackness. I decided to work with luminosity instead of against it :)

Would need to work out how to work with opacity etc though. But maybe I can get some info from that LIB on that.

EDIT:

Oh and as long as I make sure an obj uses Move() when its placed, it should cast light too.

If I am pre-placing the Obj/ on the map before hand, I think that I can simply add Move() to its New() and that should do it as well.
#3 Mar 1 2011, 1:57 pm
In response to UnknownDuelist (#2)
You could set different shaded overlay's for each turf?

Just a thought