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Core.lua
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Core.lua
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------------------------------------------
-- Create references to important objects
------------------------------------------
Services = {
Workspace = Game:GetService 'Workspace';
Players = Game:GetService 'Players';
Debris = Game:GetService 'Debris';
MarketplaceService = Game:GetService 'MarketplaceService';
ContentProvider = Game:GetService 'ContentProvider';
SoundService = Game:GetService 'SoundService';
UserInputService = Game:GetService 'UserInputService';
TestService = Game:GetService 'TestService';
Selection = Game:GetService 'Selection';
CoreGui = Game:GetService 'CoreGui';
HttpService = Game:GetService 'HttpService';
ChangeHistoryService = Game:GetService 'ChangeHistoryService';
JointsService = Game.JointsService;
};
Assets = {
DarkSlantedRectangle = 'http://www.roblox.com/asset/?id=127774197';
LightSlantedRectangle = 'http://www.roblox.com/asset/?id=127772502';
ActionCompletionSound = 'http://www.roblox.com/asset/?id=99666917';
ExpandArrow = 'http://www.roblox.com/asset/?id=134367382';
UndoActiveDecal = 'http://www.roblox.com/asset/?id=141741408';
UndoInactiveDecal = 'http://www.roblox.com/asset/?id=142074557';
RedoActiveDecal = 'http://www.roblox.com/asset/?id=141741327';
RedoInactiveDecal = 'http://www.roblox.com/asset/?id=142074553';
DeleteActiveDecal = 'http://www.roblox.com/asset/?id=141896298';
DeleteInactiveDecal = 'http://www.roblox.com/asset/?id=142074644';
ExportActiveDecal = 'http://www.roblox.com/asset/?id=141741337';
ExportInactiveDecal = 'http://www.roblox.com/asset/?id=142074569';
CloneActiveDecal = 'http://www.roblox.com/asset/?id=142073926';
CloneInactiveDecal = 'http://www.roblox.com/asset/?id=142074563';
PluginIcon = 'http://www.roblox.com/asset/?id=142287521';
GroupLockIcon = 'http://www.roblox.com/asset/?id=175396862';
GroupUnlockIcon = 'http://www.roblox.com/asset/?id=160408836';
GroupUpdateOKIcon = 'http://www.roblox.com/asset/?id=164421681';
GroupUpdateIcon = 'http://www.roblox.com/asset/?id=160402908';
};
-- The ID of the tool model on ROBLOX
ToolAssetID = 142785488;
Tool = script.Parent;
Player = Services.Players.LocalPlayer;
Mouse = nil;
-- Set tool or plugin-specific references
if plugin then
ToolType = 'plugin';
GUIContainer = Services.CoreGui;
-- Create the toolbar button
ToolbarButton = plugin:CreateToolbar( 'Building Tools by F3X' ):CreateButton( '', 'Building Tools by F3X', Assets.PluginIcon );
elseif Tool:IsA 'Tool' then
ToolType = 'tool';
GUIContainer = Player:WaitForChild 'PlayerGui';
end;
------------------------------------------
-- Load external dependencies
------------------------------------------
RbxUtility = LoadLibrary 'RbxUtility';
-- Preload external assets
for ResourceName, ResourceUrl in pairs( Assets ) do
Services.ContentProvider:Preload( ResourceUrl );
end;
repeat wait( 0 ) until _G.gloo;
Gloo = _G.gloo;
Tool:WaitForChild 'HttpInterface';
Tool:WaitForChild 'Interfaces';
------------------------------------------
-- Define functions that are depended-upon
------------------------------------------
function _findTableOccurrences( haystack, needle )
-- Returns the positions of instances of `needle` in table `haystack`
local positions = {};
-- Add any indexes from `haystack` that have `needle`
for index, value in pairs( haystack ) do
if value == needle then
table.insert( positions, index );
end;
end;
return positions;
end;
function _round( number, places )
-- Returns `number` rounded to the number of decimal `places`
-- (from lua-users)
local mult = 10 ^ ( places or 0 );
return math.floor( number * mult + 0.5 ) / mult;
end
function _cloneTable( source )
-- Returns a deep copy of table `source`
-- Get a copy of `source`'s metatable, since the hacky method
-- we're using to copy the table doesn't include its metatable
local source_mt = getmetatable( source );
-- Return a copy of `source` including its metatable
return setmetatable( { unpack( source ) }, source_mt );
end;
function _getAllDescendants( Parent )
-- Recursively gets all the descendants of `Parent` and returns them
local descendants = {};
for _, Child in pairs( Parent:GetChildren() ) do
-- Add the direct descendants of `Parent`
table.insert( descendants, Child );
-- Add the descendants of each child
for _, Subchild in pairs( _getAllDescendants( Child ) ) do
table.insert( descendants, Subchild );
end;
end;
return descendants;
end;
function _pointToScreenSpace( Point )
-- Returns Vector3 `Point`'s position on the screen when rendered
-- (kudos to stravant for this)
local point = Services.Workspace.CurrentCamera.CoordinateFrame:pointToObjectSpace( Point );
local aspectRatio = Mouse.ViewSizeX / Mouse.ViewSizeY;
local hfactor = math.tan( math.rad( Services.Workspace.CurrentCamera.FieldOfView ) / 2 )
local wfactor = aspectRatio * hfactor;
local x = ( point.x / point.z ) / -wfactor;
local y = ( point.y / point.z ) / hfactor;
local screen_pos = Vector2.new( Mouse.ViewSizeX * ( 0.5 + 0.5 * x ), Mouse.ViewSizeY * ( 0.5 + 0.5 * y ) );
if ( screen_pos.x < 0 or screen_pos.x > Mouse.ViewSizeX ) or ( screen_pos.y < 0 or screen_pos.y > Mouse.ViewSizeY ) then
return nil;
end;
if Services.Workspace.CurrentCamera.CoordinateFrame:toObjectSpace( CFrame.new( Point ) ).z > 0 then
return nil;
end;
return screen_pos;
end;
function _cloneParts( parts )
-- Returns a table of cloned `parts`
local new_parts = {};
-- Copy the parts into `new_parts`
for part_index, Part in pairs( parts ) do
new_parts[part_index] = Part:Clone();
end;
return new_parts;
end;
function _replaceParts( old_parts, new_parts )
-- Removes `old_parts` and inserts `new_parts`
-- Remove old parts
for _, OldPart in pairs( old_parts ) do
OldPart.Parent = nil;
end;
-- Insert `new_parts
for _, NewPart in pairs( new_parts ) do
NewPart.Parent = Services.Workspace;
NewPart:MakeJoints();
end;
end;
function _splitString( str, delimiter )
-- Returns a table of string `str` split by pattern `delimiter`
local parts = {};
local pattern = ( "([^%s]+)" ):format( delimiter );
str:gsub( pattern, function ( part )
table.insert( parts, part );
end );
return parts;
end;
function _getChildOfClass( Parent, class_name, inherit )
-- Returns the first child of `Parent` that is of class `class_name`
-- or nil if it couldn't find any
-- Look for a child of `Parent` of class `class_name` and return it
if not inherit then
for _, Child in pairs( Parent:GetChildren() ) do
if Child.ClassName == class_name then
return Child;
end;
end;
else
for _, Child in pairs( Parent:GetChildren() ) do
if Child:IsA( class_name ) then
return Child;
end;
end;
end;
return nil;
end;
function _getChildrenOfClass( Parent, class_name, inherit )
-- Returns a table containing the children of `Parent` that are
-- of class `class_name`
local matches = {};
if not inherit then
for _, Child in pairs( Parent:GetChildren() ) do
if Child.ClassName == class_name then
table.insert( matches, Child );
end;
end;
else
for _, Child in pairs( Parent:GetChildren() ) do
if Child:IsA( class_name ) then
table.insert( matches, Child );
end;
end;
end;
return matches;
end;
function _HSVToRGB( hue, saturation, value )
-- Returns the RGB equivalent of the given HSV-defined color
-- (adapted from some code found around the web)
-- If it's achromatic, just return the value
if saturation == 0 then
return value;
end;
-- Get the hue sector
local hue_sector = math.floor( hue / 60 );
local hue_sector_offset = ( hue / 60 ) - hue_sector;
local p = value * ( 1 - saturation );
local q = value * ( 1 - saturation * hue_sector_offset );
local t = value * ( 1 - saturation * ( 1 - hue_sector_offset ) );
if hue_sector == 0 then
return value, t, p;
elseif hue_sector == 1 then
return q, value, p;
elseif hue_sector == 2 then
return p, value, t;
elseif hue_sector == 3 then
return p, q, value;
elseif hue_sector == 4 then
return t, p, value;
elseif hue_sector == 5 then
return value, p, q;
end;
end;
function _RGBToHSV( red, green, blue )
-- Returns the HSV equivalent of the given RGB-defined color
-- (adapted from some code found around the web)
local hue, saturation, value;
local min_value = math.min( red, green, blue );
local max_value = math.max( red, green, blue );
value = max_value;
local value_delta = max_value - min_value;
-- If the color is not black
if max_value ~= 0 then
saturation = value_delta / max_value;
-- If the color is purely black
else
saturation = 0;
hue = -1;
return hue, saturation, value;
end;
if red == max_value then
hue = ( green - blue ) / value_delta;
elseif green == max_value then
hue = 2 + ( blue - red ) / value_delta;
else
hue = 4 + ( red - green ) / value_delta;
end;
hue = hue * 60;
if hue < 0 then
hue = hue + 360;
end;
return hue, saturation, value;
end;
function _IdentifyCommonItem(Items)
-- Returns the common item in table `Items`, or `nil` if
-- they vary
local CommonItem = nil;
for ItemIndex, Item in pairs(Items) do
-- Set the initial item to compare against
if ItemIndex == 1 then
CommonItem = Item;
-- Check if this item is the same as the rest
else
-- If it isn't the same, there is no common item, so just stop right here
if Item ~= CommonItem then
return nil;
end;
end;
end;
-- Return the common item
return CommonItem;
end;
function CreateSignal()
-- Returns a ROBLOX-like signal for connections (RbxUtility's is buggy)
local Signal = {
Connections = {};
Connect = function ( Signal, Handler )
table.insert( Signal.Connections, Handler );
local ConnectionController = {
Handler = Handler;
Disconnect = function ( Connection )
local ConnectionSearch = _findTableOccurrences( Signal.Connections, Connection.Handler );
if #ConnectionSearch > 0 then
local ConnectionIndex = ConnectionSearch[1];
table.remove( Signal.Connections, ConnectionIndex );
end;
end;
};
-- Add compatibility aliases
ConnectionController.disconnect = ConnectionController.Disconnect;
return ConnectionController;
end;
Fire = function ( Signal, ... )
for _, Connection in pairs( Signal.Connections ) do
Connection( ... );
end;
end;
};
-- Add compatibility aliases
Signal.connect = Signal.Connect;
Signal.fire = Signal.Fire;
return Signal;
end;
------------------------------------------
-- Prepare the UI
------------------------------------------
-- Wait for all parts of the base UI to fully replicate
if ToolType == 'tool' then
local UIComponentCount = (Tool:WaitForChild 'UIComponentCount').Value;
repeat wait( 0.1 ) until #_getAllDescendants( Tool.Interfaces ) >= UIComponentCount;
end;
------------------------------------------
-- Create data containers
------------------------------------------
ActiveKeys = {};
CurrentTool = nil;
function equipTool( NewTool )
-- If it's a different tool than the current one
if CurrentTool ~= NewTool then
-- Run (if existent) the old tool's `Unequipped` listener
if CurrentTool and CurrentTool.Listeners.Unequipped then
CurrentTool.Listeners.Unequipped();
end;
CurrentTool = NewTool;
-- Recolor the handle
if ToolType == 'tool' then
Tool.Handle.BrickColor = NewTool.Color;
end;
-- Highlight the right button on the dock
for _, Button in pairs( Dock.ToolButtons:GetChildren() ) do
Button.BackgroundTransparency = 1;
end;
local Button = Dock.ToolButtons:FindFirstChild( getToolName( NewTool ) .. "Button" );
if Button then
Button.BackgroundTransparency = 0;
end;
-- Run (if existent) the new tool's `Equipped` listener
if NewTool.Listeners.Equipped then
NewTool.Listeners.Equipped();
end;
end;
end;
function cloneSelection()
-- Clones the items in the selection
-- Make sure that there are items in the selection
if #Selection.Items > 0 then
local item_copies = {};
-- Make a copy of every item in the selection and add it to table `item_copies`
for _, Item in pairs( Selection.Items ) do
local ItemCopy = Item:Clone();
ItemCopy.Parent = Services.Workspace;
table.insert( item_copies, ItemCopy );
end;
-- Replace the selection with the copied items
Selection:clear();
for _, Item in pairs( item_copies ) do
Selection:add( Item );
end;
local HistoryRecord = {
copies = item_copies;
unapply = function ( self )
for _, Copy in pairs( self.copies ) do
if Copy then
Copy.Parent = nil;
end;
end;
end;
apply = function ( self )
Selection:clear();
for _, Copy in pairs( self.copies ) do
if Copy then
Copy.Parent = Services.Workspace;
Copy:MakeJoints();
Selection:add( Copy );
end;
end;
end;
};
History:add( HistoryRecord );
-- Play a confirmation sound
local Sound = RbxUtility.Create "Sound" {
Name = "BTActionCompletionSound";
Pitch = 1.5;
SoundId = Assets.ActionCompletionSound;
Volume = 1;
Parent = Player or Services.SoundService;
};
Sound:Play();
Sound:Destroy();
-- Highlight the outlines of the new parts
coroutine.wrap( function ()
for transparency = 1, 0.5, -0.1 do
for Item, SelectionBox in pairs( SelectionBoxes ) do
SelectionBox.Transparency = transparency;
end;
wait( 0.1 );
end;
end )();
end;
end;
function deleteSelection()
-- Deletes the items in the selection
if #Selection.Items == 0 then
return;
end;
local selection_items = _cloneTable( Selection.Items );
-- Create a history record
local HistoryRecord = {
targets = selection_items;
parents = {};
apply = function ( self )
for _, Target in pairs( self.targets ) do
if Target then
Target.Parent = nil;
end;
end;
end;
unapply = function ( self )
Selection:clear();
for _, Target in pairs( self.targets ) do
if Target then
Target.Parent = self.parents[Target];
Target:MakeJoints();
Selection:add( Target );
end;
end;
end;
};
for _, Item in pairs( selection_items ) do
HistoryRecord.parents[Item] = Item.Parent;
Item.Parent = nil;
end;
History:add( HistoryRecord );
end;
function prismSelect()
-- Selects all the parts within the area of the selected parts
-- Make sure parts to define the area are present
if #Selection.Items == 0 then
return;
end;
local parts = {};
-- Get all the parts in workspace
local workspace_parts = {};
local workspace_children = _getAllDescendants( Services.Workspace );
for _, Child in pairs( workspace_children ) do
if Child:IsA( 'BasePart' ) and not Selection:find( Child ) then
table.insert( workspace_parts, Child );
end;
end;
-- Go through each part and perform area tests on each one
local checks = {};
for _, Item in pairs( workspace_parts ) do
checks[Item] = 0;
for _, SelectionItem in pairs( Selection.Items ) do
-- Calculate the position of the item in question in relation to the area-defining parts
local offset = SelectionItem.CFrame:toObjectSpace( Item.CFrame );
local extents = SelectionItem.Size / 2;
-- Check the item off if it passed this test (if it's within the range of the extents)
if ( math.abs( offset.x ) <= extents.x ) and ( math.abs( offset.y ) <= extents.y ) and ( math.abs( offset.z ) <= extents.z ) then
checks[Item] = checks[Item] + 1;
end;
end;
end;
-- Delete the parts that were used to select the area
local selection_items = _cloneTable( Selection.Items );
local selection_item_parents = {};
for _, Item in pairs( selection_items ) do
selection_item_parents[Item] = Item.Parent;
Item.Parent = nil;
end;
-- Select the parts that passed any area checks
for _, Item in pairs( workspace_parts ) do
if checks[Item] > 0 then
Selection:add( Item );
end;
end;
-- Add a history record
History:add( {
selection_parts = selection_items;
selection_part_parents = selection_item_parents;
new_selection = _cloneTable( Selection.Items );
apply = function ( self )
Selection:clear();
for _, Item in pairs( self.selection_parts ) do
Item.Parent = nil;
end;
for _, Item in pairs( self.new_selection ) do
Selection:add( Item );
end;
end;
unapply = function ( self )
Selection:clear();
for _, Item in pairs( self.selection_parts ) do
Item.Parent = self.selection_part_parents[Item];
Selection:add( Item );
end;
end;
} );
end;
function toggleHelp()
-- Make sure the dock is ready
if not Dock then
return;
end;
-- Toggle the visibility of the help tooltip
Dock.HelpInfo.Visible = not Dock.HelpInfo.Visible;
end;
function getToolName( tool )
-- Returns the name of `tool` as registered in `Tools`
local name_search = _findTableOccurrences( Tools, tool );
if #name_search > 0 then
return name_search[1];
end;
end;
function isSelectable( Object )
-- Returns whether `Object` is selectable
if not Object or not Object.Parent or not Object:IsA( "BasePart" ) or Object.Locked or Selection:find( Object ) or Groups:IsPartIgnored( Object ) then
return false;
end;
-- If it passes all checks, return true
return true;
end;
function IsVersionOutdated()
-- Returns whether this version of Building Tools is out of date
-- Check the most recent version number
local AssetInfo = Services.MarketplaceService:GetProductInfo( ToolAssetID, Enum.InfoType.Asset );
local VersionID = AssetInfo.Description:match( '%[Version: (.+)%]' );
local CurrentVersionID = ( Tool:WaitForChild 'Version' ).Value;
-- If the most recent version ID differs from the current tool's version ID,
-- this version of the tool is outdated
if VersionID ~= CurrentVersionID then
return true;
end;
-- If it's up-to-date, return false
return false;
end;
-- Provide initial HttpService availability info
HttpAvailable, HttpAvailabilityError = Tool.HttpInterface:WaitForChild('Test'):InvokeServer();
-- Keep track of the latest HttpService availability status
-- (which is only likely to change while in Studio, using the plugin)
if ToolType == 'plugin' then
Services.HttpService.Changed:connect( function ()
HttpAvailable, HttpAvailabilityError = Tool.HttpInterface:WaitForChild('Test'):InvokeServer();
end );
end;
local StartupNotificationsShown = false;
function ShowStartupNotifications()
-- Make sure the startup notifications are only shown once
if StartupNotificationsShown then
return;
end;
StartupNotificationsShown = true;
-- Create the main container for notifications
local NotificationContainer = Tool.Interfaces.BTStartupNotificationContainer:Clone();
-- Add the right notifications
if not HttpAvailable and HttpAvailabilityError == 'Http requests are not enabled' then
NotificationContainer.HttpDisabledWarning.Visible = true;
end;
if not HttpAvailable and HttpAvailabilityError == 'Http requests can only be executed by game server' then
NotificationContainer.SoloWarning.Visible = true;
end;
if IsVersionOutdated() then
if ToolType == 'tool' then
NotificationContainer.ToolUpdateNotification.Visible = true;
elseif ToolType == 'plugin' then
NotificationContainer.PluginUpdateNotification.Visible = true;
end;
end;
local function SetContainerSize()
-- A function to position the notifications in the container and
-- resize the container to fit all the notifications
-- Keep track of the lowest extent of each item in the container
local LowestPoint = 0;
local Notifications = NotificationContainer:GetChildren();
for NotificationIndex, Notification in pairs( Notifications ) do
-- Position each notification under the last one
Notification.Position = UDim2.new(
Notification.Position.X.Scale,
Notification.Position.X.Offset,
Notification.Position.Y.Scale,
( LowestPoint == 0 ) and 0 or ( LowestPoint + 10 )
);
-- Calculate the lowest point of this notification
local VerticalEnd = Notification.Position.Y.Offset + Notification.Size.Y.Offset;
if Notification.Visible and VerticalEnd > LowestPoint then
LowestPoint = VerticalEnd;
end;
end;
NotificationContainer.Size = UDim2.new(
NotificationContainer.Size.X.Scale,
NotificationContainer.Size.X.Offset,
0,
LowestPoint
);
end;
SetContainerSize();
-- Have the container start from the center/bottom of the screen
local HCenterPos = ( UI.AbsoluteSize.x - NotificationContainer.Size.X.Offset ) / 2;
local VBottomPos = UI.AbsoluteSize.y + NotificationContainer.Size.Y.Offset;
NotificationContainer.Position = UDim2.new( 0, HCenterPos, 0, VBottomPos );
NotificationContainer.Parent = UI;
local function CenterNotificationContainer()
-- A function to center the notification container
-- Animate the container to slide up to the absolute center of the screen
local VCenterPos = ( UI.AbsoluteSize.y - NotificationContainer.Size.Y.Offset ) / 2;
NotificationContainer:TweenPosition(
UDim2.new( 0, HCenterPos, 0, VCenterPos ),
Enum.EasingDirection.Out,
Enum.EasingStyle.Quad,
0.2
);
end;
CenterNotificationContainer();
-- Add functionality to the notification UIs
for _, Notification in pairs( NotificationContainer:GetChildren() ) do
if Notification.Visible then
Notification.OKButton.MouseButton1Click:connect( function ()
Notification:Destroy();
SetContainerSize();
CenterNotificationContainer();
end );
Notification.HelpButton.MouseButton1Click:connect( function ()
Notification.HelpButton:Destroy();
Notification.ButtonSeparator:Destroy();
Notification.OKButton:TweenSize(
UDim2.new( 1, 0, 0, 22 ),
Enum.EasingDirection.Out,
Enum.EasingStyle.Quad,
0.2
);
Notification.Notice:Destroy();
Notification.Help.Visible = true;
Notification:TweenSize(
UDim2.new(
Notification.Size.X.Scale, Notification.Size.X.Offset,
Notification.Size.Y.Scale, Notification.Help.NotificationSize.Value
),
Enum.EasingDirection.Out,
Enum.EasingStyle.Quad,
0.2,
true,
function ()
SetContainerSize();
CenterNotificationContainer();
end
);
end );
end;
end;
-- Get rid of the notifications if the user unequips the tool
if ToolType == 'tool' then
Tool.Unequipped:connect( function ()
if NotificationContainer.Visible then
NotificationContainer.Visible = false;
NotificationContainer:Destroy();
end;
end );
end;
end;
-- Keep some state data
clicking = false;
selecting = false;
click_x, click_y = 0, 0;
override_selection = false;
SelectionBoxes = {};
SelectionExistenceListeners = {};
SelectionBoxColor = BrickColor.new( "Cyan" );
TargetBox = nil;
-- Keep a container for temporary connections
-- from the platform
Connections = {};
-- Make sure the UI container gets placed
UI = RbxUtility.Create "ScreenGui" {
Name = "Building Tools by F3X (UI)"
};
if ToolType == 'tool' then
UI.Parent = GUIContainer;
elseif ToolType == 'plugin' then
UI.Parent = Services.CoreGui;
end;
Dragger = nil;
function updateSelectionBoxColor()
-- Updates the color of the selectionboxes
for _, SelectionBox in pairs( SelectionBoxes ) do
SelectionBox.Color = SelectionBoxColor;
end;
end;
Selection = {
["Items"] = {};
-- Provide events to listen to changes in the selection
["Changed"] = RbxUtility.CreateSignal();
["ItemAdded"] = RbxUtility.CreateSignal();
["ItemRemoved"] = RbxUtility.CreateSignal();
["Cleared"] = RbxUtility.CreateSignal();
-- Provide a method to get an item's index in the selection
["find"] = function ( self, Needle )
-- Look through all the selected items and return the matching item's index
for item_index, Item in pairs( self.Items ) do
if Item == Needle then
return item_index;
end;
end;
-- Otherwise, return `nil`
end;
-- Provide a method to add items to the selection
["add"] = function ( self, NewPart )
-- Make sure `NewPart` is selectable
if not isSelectable( NewPart ) then
return false;
end;
-- Make sure `NewPart` isn't already in the selection
if #_findTableOccurrences( self.Items, NewPart ) > 0 then
return false;
end;
-- Insert it into the selection
table.insert( self.Items, NewPart );
-- Add its SelectionBox if we're in tool mode
if ToolType == 'tool' then
SelectionBoxes[NewPart] = Instance.new( "SelectionBox", UI );
SelectionBoxes[NewPart].Name = "BTSelectionBox";
SelectionBoxes[NewPart].Color = SelectionBoxColor;
SelectionBoxes[NewPart].Adornee = NewPart;
SelectionBoxes[NewPart].Transparency = 0.5;
end;
-- Remove any target selection box focus
if NewPart == TargetBox.Adornee then
TargetBox.Adornee = nil;
end;
-- Make sure to remove the item from the selection when it's deleted
SelectionExistenceListeners[NewPart] = NewPart.AncestryChanged:connect( function ( Object, NewParent )
if NewParent == nil then
Selection:remove( NewPart );
end;
end );
-- Provide a reference to the last item added to the selection (i.e. NewPart)
self:focus( NewPart );
-- Fire events
self.ItemAdded:fire( NewPart );
self.Changed:fire();
end;
-- Provide a method to remove items from the selection
["remove"] = function ( self, Item, Clearing )
-- Make sure selection item `Item` exists
if not self:find( Item ) then
return false;
end;
-- Remove `Item`'s SelectionBox
local SelectionBox = SelectionBoxes[Item];
if SelectionBox then
SelectionBox:Destroy();
end;
SelectionBoxes[Item] = nil;
-- Delete the item from the selection
table.remove( self.Items, self:find( Item ) );
-- If it was logged as the last item, change it
if self.Last == Item then
self:focus( ( #self.Items > 0 ) and self.Items[#self.Items] or nil );
end;
-- Delete the existence listeners of the item
SelectionExistenceListeners[Item]:disconnect();
SelectionExistenceListeners[Item] = nil;
-- Fire events
self.ItemRemoved:fire( Item, Clearing );
self.Changed:fire();
end;
-- Provide a method to clear the selection
["clear"] = function ( self )
-- Go through all the items in the selection and call `self.remove` on them
for _, Item in pairs( _cloneTable( self.Items ) ) do
self:remove( Item, true );
end;
-- Fire events
self.Cleared:fire();
end;
-- Provide a method to change the focus of the selection
["focus"] = function ( self, NewFocus )
-- Change the focus
self.Last = NewFocus;
-- Fire events
self.Changed:fire();
end;
};
------------------------------------------
-- WARNING: MICROOPTIMIZED CODE
------------------------------------------
-- Create shortcuts to certain things that are expensive to call constantly
local cframe_new = CFrame.new;
local table_insert = table.insert;
local cframe_toWorldSpace = CFrame.new().toWorldSpace;
local math_min = math.min;
local math_max = math.max;
function calculateExtents(Items, StaticExtents, JustExtents)
-- Returns the size and position of a boundary box that covers the extents
-- of the parts in table `Items`
-- Make sure there's actually any parts given
local RandomItem;
local ItemCount = 0;