View difference between Paste ID: Vty3vhnY and MQvSDt1F

 local version = "1.0" -- String declaration. We can do this before the GetInfo callin (event).
 function widget:GetInfo()
     return {
       name      = "Ez Selector " .. version, -- .. means to combine two strings. The second string, 'version' (see above) is added to the end of this string.
       desc      = "Selects units when a user presses a certain key.",
       author    = "_Shaman",
       date      = "May 19, 2016",
       license   = "None",
       layer     = 15,
       enabled   = true,
     }
   end -- All widgets/gadgets need this to run. You can declare variables before it though. This tells the engine this is a widget.
 
   --config--
 local debug = false
 local color = {raider = {0.25,0.41,1},
                 assault = {0.86,0.08,0.24},
                 skirm = {0.25,0.55,0.13},
                 arty = {0.8,0.68,0},
                 riot = {0,0.81,0.82},
                 none = {1,1,1},
                 growth = {0.19,0.5,0.08},
                 shrink = {1,0.08,0.58},} -- OpenGL uses floating points instead of 255 (float = decimal num)
 local keypresses = {raider = 113,
                     assault = 97,
                     skirm = 116,
                     arty = 120,
                     riot = 122,
                     plus = 91, -- increased radius.
                     minus = 93, -- decrease radius. Change these as desired.
                     } -- Table. Format is Key = Value. 113.115.100.102.103
 
 local triggerkeys = {}
 triggerkeys[keypresses.raider] = 1
 triggerkeys[keypresses.assault] = 1
 triggerkeys[keypresses.skirm] = 1
 triggerkeys[keypresses.arty] = 1
 triggerkeys[keypresses.riot] = 1
 local rad = 150
 local on = false
 local ontype = "none" -- we'll use ontype and on to talk to gameframe and drawworld.
 local unittypes = {raider = {
                     armpw = 1,
                     corak = 1,
                     corgator = 1,
                     amphraider3 = 1,
                     corpyro = 1,
                     corsh = 1,
                     subraider = 1,
                     armpw = 1,
                     },
                    assault = {
                     armzeus = 1,
                     armorco = 1,
                     spiderassault = 1,
                     corgol = 1,
                     correap = 1,
                     shipraider = 1,
                     amphassault = 1,
                     corraid = 1,
                     corthud = 1,
                     corcan = 1,
                     hoverassault = 1,
                     funnelweb = 1,
                    },
                    skirm = {
                     armrock = 1,
                     armsptk = 1,
                     slowmort = 1,
                     corstorm = 1,
                     shipskirm = 1,
                     amphfloater = 1,
                     cormist = 1,
                    },
                    arty = {
                     armham = 1,
                     armraven = 1,
                     armsnipe = 1,
                     shieldarty = 1,
                     firewalker = 1,
                     corgarp = 1,
                     armmerl = 1,
                     cormart = 1,
                     trem = 1,
                     armcrabe = 1,
                     subarty = 1,
                     shiparty = 1,
                     corbats = 1,
                     reef = 1,
                     armmanni = 1,
                    },
                    riot = {
                     armwar = 1,
                     cormak = 1,
                     spiderriot = 1,
                     arm_venom = 1,
                     jumpblackhole = 1,
                     corsumo = 1,
                     corlevlr = 1,
                     tawf114 = 1,
                     amphriot = 1,
                     amphraider2 = 1,
                     shiptorp = 1,
                     dante = 1,
                     hoverriot = 1,
                    }
                   }
 
 local selection = {}
 local selected = {}
 local checked = {}
 local radchanged = false
 local originalrad = rad
 local radchangeddrawtime = 0
 local lastrelease = -1
 
 function widget:KeyPress(key, mods, isRepeat) -- This callin is triggered whenever the user presses a key.
   if key == keypresses.plus then
     if radchanged == false then
       originalrad = rad
     end
     rad = rad+10
     radchanged = true
     radchangeddrawtime = 12
   end
   if key == keypresses.minus and rad > 10 then
     rad = rad-10
     radchanged = true
     radchangeddrawtime = 12
   end
   if isRepeat == false and debug then
     Spring.Echo("game_message: key: " .. key)
   end
   if key == keypresses.raider and isRepeat and ontype == "none" then --Here keypresses.raider is the same as keypresses["raider"]. This is how you look up values in a table.
     on = true -- we're using this variable to talk to KeyRelease and DrawWorld. This way then they know we're working on getting a selection going.
     ontype = "raider"
   end
   if key == keypresses.skirm and isRepeat and ontype == "none" then
     on = true
     ontype = "skirm"
   end
   if key == keypresses.assault and isRepeat and ontype == "none" then
     on = true
     ontype = "assault"
   end
   if key == keypresses.arty and isRepeat and ontype == "none" then
     on = true
     ontype = "arty"
   end
   if key == keypresses.riot and isRepeat and ontype == "none" then
     on = true
     ontype = "riot"
   end
 end
 
 function widget:GameFrame(f) -- called once every frame. This is so we don't keep looking for units every keypress.
   if radchanged and radchangeddrawtime > 0 then
     radchangeddrawtime = radchangeddrawtime - 1
     if radchangeddrawtime == 0 then
       radchanged = false
     end
   end
   if f%2 == 0 then -- % means the remainers left after divided by the second number. here it's framenum divided by 2. So this happens every 2nd frame.
   if on and ontype ~= "none" then
     local x,y = Spring.GetMouseState()
     local _,pos = Spring.TraceScreenRay(x,y,true)
     if type(pos) == "table" then -- prevent crashing from attempting to index a number value. The above seems to give random numbers sometimes.
       x = pos[1];y = pos[3];pos = nil -- ; is effectively a new line in LUA. This just makes your code look nicer.
     else
       if Spring.ValidUnitID(pos) then
         x,_,y = Spring.GetUnitPosition(pos)
       elseif Spring.ValidFeatureID(pos) then
         x,_,y = Spring.GetFeaturePosition(pos)
       end
     end
     if x ~= nil and y ~= nil then
       for _,id in pairs(Spring.GetUnitsInCylinder(x,y,rad,Spring.GetMyTeamID())) do -- Here we're skipping the creation of the table altogether in favor of just plugging in the results of 'getunitsincylinder'
         if checked[id] == nil and unittypes[ontype][UnitDefs[Spring.GetUnitDefID(id)].name] and not selected[id] then -- Here we're using LUA's if true or exists logic. This says 'if this unit's unitdefid exists as a value in this table AND it's not a key in selected, then do this. This means units must match on the table and be a unique unit
           if debug then Spring.Echo("game_message: Selected " .. id) end
           selection[#selection+1] = id
           selected[id] = id
         end
         checked[id] = 1
       end
     end
   end
 end
 end
 
 function widget:KeyRelease(key) -- Called whenever user stops pressing a key.
   if triggerkeys[key] and on then
     on = false
     ontype = "none"
     Spring.SelectUnitArray(selection,false)
     selection = {} -- clear the table.
     selected = {}
     checked = {}
   end
 end
 
 function widget:DrawWorld() -- this is used for openGL stuff.
   if on or radchanged then
     local x,y = Spring.GetMouseState()
     local _,pos = Spring.TraceScreenRay(x,y,true)
     x,y = nil
     if type(pos) == "number" then -- prevent crashing from attempting to index a number value. The above seems to give random numbers sometimes.
       if Spring.ValidUnitID(pos) then
         local id = pos
         pos = {}
         pos[1],pos[2],pos[3] = Spring.GetUnitPosition(id)
         id = nil
       elseif Spring.ValidFeatureID(pos) then
         local id = pos
         pos = {}
         pos[1],pos[2],pos[3] = Spring.GetFeaturePosition(id)
       end
     end
     if on then
       if type(pos) == "table" and pos[1] ~= nil and pos[2] ~= nil then
         gl.PushMatrix() --This is the start of an openGL function.
         gl.LineStipple(true)
         gl.LineWidth(3.0)
         gl.Color(color[ontype][1],color[ontype][2],color[ontype][3],1)
         gl.DrawGroundCircle(pos[1], pos[2], pos[3], rad, 40) -- draws a simple circle.
         gl.Translate(pos[1],pos[2],pos[3])
         gl.Billboard()
         gl.Text("Selecting " .. ontype,-25,-25,12,"v") -- Displays text. First value is the string, second is a modifier for x (in this case it's x-25), third is a modifier for y, fourth is the size, then last is a modifier for the text itself. "v" means vertical align.
         gl.Color(1,1,1,1) -- we have to reset what we did here.
         gl.LineWidth(1.0)
         gl.LineStipple(false)
         gl.PopMatrix() -- end of function. Have to use this with after a push!
       end
     end
   if radchanged and not on and type(pos) == "table" and originalrad then
     gl.PushMatrix()
     gl.LineWidth(3.0)
     gl.Color(1,1,1,1)
     gl.DrawGroundCircle(pos[1],pos[2],pos[3],originalrad,40)
     if rad > originalrad then
       gl.Color(color["growth"][1],color["growth"][2],color["growth"][3],1)
     else
       if rad < originalrad then
         gl.Color(color["shrink"][1],color["shrink"][2],color["shrink"][3],1)
       else
         gl.Color(1,1,1,1)
       end
     end
     gl.LineStipple(true)
     gl.DrawGroundCircle(pos[1],pos[2],pos[3],rad,40)
     gl.LineStipple(false)
     gl.Translate(pos[1],pos[2],pos[3])
     gl.Billboard()
     gl.Text("New Radius: " .. rad .. "(Was: " .. originalrad .. ", change:" .. rad-originalrad .. ")",-100,-25,12,"v")
     gl.LineWidth(1.0)
     gl.Color(1,1,1,1)
     gl.PopMatrix()
   end
   pos = nil
 end
 if #selection > 0 then -- Draw circles around selected units. #tablename is the length of the ordered table (or last consecutive value)
   local pos = {}
     for i=1,#selection do -- do this for every entry in the ordered table. i is the incremental value. i=1 means that the first value is 1. i increases by 1 (or a third value if provided eg 1,5,0.25 would do 1 + 0.25 every execution) with every execution and will continue until i == #selection. i=1,#table is very useful for doing things to every entry in an ordered table.
       if Spring.ValidUnitID(selection[i]) then
         pos[1],pos[2],pos[3] = Spring.GetUnitPosition(selection[i])
         gl.PushMatrix()
         gl.LineWidth(3.0)
         gl.Color(color[ontype][1],color[ontype][2],color[ontype][3],1)
         gl.DrawGroundCircle(pos[1],pos[2],pos[3],40,40)
         gl.Color(1,1,1,1)
         gl.PopMatrix()
       end
     end
   end
 end