From adb110d8d8165ed85f1171d7aaa305ae1a144ac1 Mon Sep 17 00:00:00 2001
From: DokaDoka <maxwelljamesmurphy@gmail.com>
Date: Mon, 25 Apr 2022 20:28:10 +1000
Subject: [PATCH] feat(imports/zones): basic glm polygon zones

build on the points structure
---
 imports/zones/client.lua | 103 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 imports/zones/client.lua

diff --git a/imports/zones/client.lua b/imports/zones/client.lua
new file mode 100644
index 0000000..a36bafa
--- /dev/null
+++ b/imports/zones/client.lua
@@ -0,0 +1,103 @@
+local glm = require 'glm'
+local zones = {}
+
+local function removeZone(self)
+	zones[self.id] = nil
+end
+
+local nearby = {}
+local tick
+
+CreateThread(function()
+	while true do
+		local coords = GetEntityCoords(cache.ped)
+		Wait(300)
+		table.wipe(nearby)
+
+		for _, zone in pairs(zones) do
+			local distance = #(coords - zone.polygon:centroid())
+
+			if distance <= zone.inRange then
+				if zone.nearby then
+					nearby[#nearby + 1] = zone
+				end
+
+				if zone.polygon:contains(coords, zone.thickness) then
+					if zone.onEnter and not zone.inside then
+						zone.inside = true
+						zone:onEnter()
+					end
+				elseif zone.inside then
+					if zone.onExit then zone:onExit() end
+					zone.inside = nil
+				end
+			end
+		end
+
+		if not tick then
+			if #nearby > 0 then
+				tick = SetInterval(function()
+					for i = 1, #nearby do
+						nearby[i]:nearby()
+						if nearby[i].debug then
+							nearby[i]:drawPolygon()
+						end
+					end
+				end)
+			end
+		elseif #nearby == 0 then
+			tick = ClearInterval(tick)
+		end
+	end
+end)
+
+return {
+	new = function(points, thickness, data)
+		local id = #zones + 1
+		local self = {
+			id = id,
+			thickness = thickness,
+			polygon = glm.polygon.new(points),
+			remove = removeZone
+		}
+
+		if data then
+			for k, v in pairs(data) do
+				self[k] = v
+			end
+		end
+
+		if self.debug and not self.nearby then
+			self.nearby = function() end
+		end
+
+		local centroid = self.polygon:centroid()
+		local length = #self.polygon
+
+		self.maxDistance = 0
+		for i = 1, length do
+			local difference = #(centroid - points[i])
+			if difference > self.maxDistance then
+				self.maxDistance = difference
+			end
+		end
+
+		self.inRange = self.inRange or self.maxDistance * 1.5
+
+		self.drawPolygon = function()
+			local points = self.polygon()
+			for i = 1, #points do
+				if i == #points then
+					DrawPoly(points[i], points[1], centroid, 255, 0, 0, 50)
+					DrawPoly(points[1], points[i], centroid, 255, 0, 0, 50)
+				else
+					DrawPoly(points[i], points[i + 1], centroid, 255, 0, 0, 50)
+					DrawPoly(points[i + 1], points[i], centroid, 255, 0, 0, 50)
+				end
+			end
+		end
+
+		zones[id] = self
+		return self
+	end
+}