stuff

content/items.xml

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+<items gfxroot="gfx/items/" version="1">
+	<active name="Testing Button" description="For Testing!" gfx="test_button.png" />
+
+	<passive name="Eye of the Subconscious" description="Subconscious Firing" gfx="closed_eye.png" />
+	<passive name="Remote Control" description="RC Bombs" gfx="remote_control.png" />
+	<passive name="Bleeding Edge Tech" description="It's an early prototype..." gfx="bleeding_edge_tech.png" />
+
+	<active name="Action Worm" description="Range Up + Moldable Tears!" gfx="plastic_worm.png" maxcharges="1" />
+</items>

main.lua

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+-- ########################################
+-- BOILERPLATE
+-- ########################################
+
+local mod = RegisterMod("Vazkii's Item Pack", 1);
+local testing = true;
+
+local itemClosedEye = Isaac.GetItemIdByName("Eye of the Subconscious");
+local itemRemoteControl = Isaac.GetItemIdByName("Remote Control");
+local itemBleedingEdgeTech = Isaac.GetItemIdByName("Bleeding Edge Tech");
+local itemPlasticWorm = Isaac.GetItemIdByName("Action Worm");
+
+-- ########################################
+-- TESTING
+-- ########################################
+
+local debug = {};
+local itemTestButton = nil;
+local debuggingItem = nil;
+
+function useTestItem()
+	local player = Isaac.GetPlayer(0);
+	local pos = Isaac.GetFreeNearPosition(player.Position, 1) + Vector(0, 16);
+
+	Isaac.Spawn(EntityType.ENTITY_PICKUP, PickupVariant.PICKUP_COLLECTIBLE, debuggingItem, pos, Vector(0, 0), player);
+end
+
+function debugDisplay()
+	for i=1, #debug do
+		Isaac.RenderText(debug[i], 80, 30 + i * 10, 255, 255, 255, 255);
+	end
+end
+
+if testing then
+	itemTestButton = Isaac.GetItemIdByName("Testing Button");
+	debuggingItem = itemPlasticWorm;
+
+	mod:AddCallback(ModCallbacks.MC_USE_ITEM, useTestItem, itemTestButton);
+	mod:AddCallback(ModCallbacks.MC_POST_RENDER, debugDisplay);
+end
+
+-- ########################################
+-- EYE OF THE SUBCONSCIOUS
+-- ########################################
+
+function updateClosedEye()
+	local player = Isaac.GetPlayer(0);
+
+	if player:HasCollectible(CollectibleType.COLLECTIBLE_BRIMSTONE) or (not player:CanShoot()) then
+		return;
+	end
+
+	local cd = player.MaxFireDelay * 2;
+	if player:HasCollectible(itemClosedEye) then
+		local entities = filter(Isaac.GetRoomEntities(), function(e)
+			return e:IsVulnerableEnemy();
+		end);
+
+		local closest = nil;
+		local dist = 10000;
+
+		for i = 1, #entities do
+			local e = entities[i];
+			player.FireDelay = cd + 1;
+			local diff = e.Position - player.Position;
+			if diff:Length() < dist then
+				closest = e;
+				dist = diff:Length();
+			end	
+		end
+
+		if closest ~= nil and tickCheck(cd) then
+			local diff = closest.Position - player.Position;
+			diff = diff * (10 * player.ShotSpeed / diff:Length());
+
+			if player:HasCollectible(CollectibleType.COLLECTIBLE_TECHNOLOGY) or player:HasCollectible(itemBleedingEdgeTech) then
+				player:FireTechLaser(player.Position, 0, diff, true, false);
+			elseif player:HasCollectible(CollectibleType.COLLECTIBLE_TECH_X) then
+				player:FireTechXLaser(player.Position, diff, 1);
+			else 
+				player:FireTear(player.Position, diff, false, true, false);
+			end
+		end
+	end
+end
+
+mod:AddCallback(ModCallbacks.MC_POST_UPDATE, updateClosedEye);
+
+-- ########################################
+-- REMOTE CONTROL
+-- ########################################
+
+local hasRemoteControl = true;
+
+function updateRemoteControl()
+	local player = Isaac.GetPlayer(0);
+
+	local hadRemoteControl = hasRemoteControl;
+	hasRemoteControl = player:HasCollectible(itemRemoteControl);
+
+	if hasRemoteControl then
+		if (not hadRemoteControl) then
+			player:AddBombs(5);
+		end
+
+		local entities = filter(Isaac.GetRoomEntities(), function(e)
+			return e.Type == EntityType.ENTITY_BOMBDROP;
+		end);
+
+		local joystick = player:GetShootingJoystick() * player.MoveSpeed;
+
+		for i = 1, #entities do
+			local e = entities[i];
+			e:AddVelocity(joystick);
+		end
+	end	
+end
+
+mod:AddCallback(ModCallbacks.MC_POST_UPDATE, updateRemoteControl);
+
+-- ########################################
+-- BLEEDING EDGE TECH
+-- ########################################
+
+local familiars = {
+	FamiliarVariant.ABEL,
+	FamiliarVariant.BBF,
+	FamiliarVariant.BLUEBABYS_ONLY_FRIEND,
+	FamiliarVariant.CAINS_OTHER_EYE,
+	FamiliarVariant.DEAD_BIRD,
+	FamiliarVariant.EVES_BIRD_FOOT,
+	FamiliarVariant.GB_BUG,
+	FamiliarVariant.GEMINI,
+	FamiliarVariant.GUPPYS_HAIRBALL,
+	FamiliarVariant.HUSHY,
+	FamiliarVariant.KING_BABY,
+	FamiliarVariant.LEECH,
+	FamiliarVariant.MULTIDIMENSIONAL_BABY,
+	FamiliarVariant.OBSESSED_FAN,
+	FamiliarVariant.PAPA_FLY,
+	FamiliarVariant.PEEPER,
+	FamiliarVariant.PUNCHING_BAG,
+	FamiliarVariant.ROBO_BABY_2,
+	FamiliarVariant.SCISSORS,
+	FamiliarVariant.SISSY_LONGLEGS,
+	FamiliarVariant.SMART_FLY,
+	FamiliarVariant.SPIDER_MOD,
+	FamiliarVariant.SUCCUBUS
+};
+
+local tech2Item = nil;
+local hasBleedingEdgeTech = true;
+
+function updateBleedingEdgeTech()
+	local player = Isaac.GetPlayer(0);
+
+	local hadBleedingEdgeTech = hasBleedingEdgeTech;
+	hasBleedingEdgeTech = player:HasCollectible(itemBleedingEdgeTech);
+
+	local cd = player.MaxFireDelay * 4;
+	if hasBleedingEdgeTech then
+		local entities = filter(Isaac.GetRoomEntities(), function(e)
+			return e.Type == EntityType.ENTITY_FAMILIAR and inArray(familiars, e.Variant);
+		end);
+
+		if #entities > 0 then
+			player.FireDelay = cd + 1;
+			local joystick = player:GetShootingJoystick();
+
+			if tickCheck(cd) and joystick:LengthSquared() > 0 then
+				for i = 1, #entities do
+					local e = entities[i];
+					local diff = e.Position - player.Position;
+
+					player:FireTechLaser(player.Position, 0, diff, false, false);
+				end
+			end
+		end
+	end
+end
+
+function bleedingEdgeTechPlayerInitHack(paramPlayer)
+	tech2Item = getItem(CollectibleType.COLLECTIBLE_TECHNOLOGY, tech2Item);
+end
+
+function bleedingEdgeTechPostRenderHack()
+	if tech2Item ~= nil then
+		local player = Isaac.GetPlayer(0);
+
+		if player:HasCollectible(itemBleedingEdgeTech) then
+			player:AddCostume(tech2Item, false);
+		end
+	end
+end
+
+mod:AddCallback(ModCallbacks.MC_POST_UPDATE, updateBleedingEdgeTech);
+mod:AddCallback(ModCallbacks.MC_POST_PLAYER_INIT, bleedingEdgeTechPlayerInitHack);
+mod:AddCallback(ModCallbacks.MC_POST_RENDER, bleedingEdgeTechPostRenderHack);
+
+-- ########################################
+-- ACTION WORM
+-- ########################################
+
+local plasticWormTicks = 0;
+local plasticWormX = 0;
+local plasticWormY = 0;
+
+local plasticWormMovement = {};
+local plasticWormTracked = {};
+local hasPlasticWorm = false;
+
+function usePlasticWorm()
+	local player = Isaac.GetPlayer(0);
+
+	plasticWormX = player.Position.X;
+	plasticWormY = player.Position.Y;
+	plasticWormTicks = 50;
+	plasticWormMovement = {};
+	plasticWormTracked = {};
+end
+
+function updatePlasticWorm()
+	local player = Isaac.GetPlayer(0);
+	local active = player:GetActiveItem();
+
+	local hadPlasticWorm = hasPlasticWorm;
+	hasPlasticWorm = active == itemPlasticWorm;
+
+	local rangeBonus = 20;
+	if hadPlasticWorm and (not hasPlasticWorm) then
+		player.TearHeight = player.TearHeight + rangeBonus;
+	elseif hasPlasticWorm and (not hadPlasticWorm) then
+		player.TearHeight = player.TearHeight - rangeBonus;
+	end
+
+	if plasticWormTicks > 0 then
+		local joystick = player:GetShootingJoystick() * player.ShotSpeed * 10;
+
+		plasticWormX = plasticWormX + joystick.X;
+		plasticWormY = plasticWormY + joystick.Y;
+		plasticWormTicks = plasticWormTicks - 1;
+		player.FireDelay = 1;
+
+		local pos = Vector(plasticWormX, plasticWormY);
+		Game():SpawnParticles(pos, 88, 1, 0, Color(1, 1, 1, 1, 1, 1, 1), 0);
+		plasticWormMovement[#plasticWormMovement + 1] = pos;
+	end
+
+	if hasPlasticWorm and #plasticWormMovement > 0 then
+		local entities = filter(Isaac.GetRoomEntities(), function(e)
+			return e.Type == EntityType.ENTITY_TEAR;
+		end);
+
+		for i = 1, #entities do
+			local e = entities[i];
+			local inArray = false;
+
+			for k, v in pairs(plasticWormTracked) do
+				if v.EntityData == e:GetData() then
+					inArray = true;
+
+					local ticks = v.Ticks;
+					v.Ticks = ticks + 1;
+					ticks = ticks + 2;
+					if ticks < #plasticWormMovement then
+						local diff = plasticWormMovement[ticks] - plasticWormMovement[ticks - 1];
+						diff = rotateVector(diff, v.Direction);
+
+						e.Velocity = diff;
+					end
+				end
+			end
+
+			if (not inArray) then
+				local track = {};
+				track["Ticks"] = 0;
+				track["EntityData"] = e:GetData();
+				track["Direction"] = player:GetFireDirection();
+
+				plasticWormTracked[#plasticWormTracked + 1] = track;
+			end
+		end
+	end
+end
+
+function initPlasticWorm()
+	plasticWormMovement = {};
+	plasticWormTracked = {};
+	hasPlasticWorm = false;
+end
+
+mod:AddCallback(ModCallbacks.MC_USE_ITEM, usePlasticWorm, itemPlasticWorm);
+mod:AddCallback(ModCallbacks.MC_POST_UPDATE, updatePlasticWorm);
+mod:AddCallback(ModCallbacks.MC_POST_PLAYER_INIT, initPlasticWorm);
+
+-- ########################################
+-- HELPERS
+-- ########################################
+
+function tickCheck(cd) 
+	return Isaac:GetFrameCount() % cd == 0;
+end
+
+function filter(arr, pred)
+	local newArr = {};
+
+	for i = 1, #arr do
+		local val = arr[i];
+		if pred(val) then
+			newArr[#newArr + 1] = val;
+		end
+	end
+
+	return newArr;
+end
+
+function inArray(arr, obj)
+    for k, v in ipairs(arr) do
+        if v == obj then
+            return true;
+        end
+    end
+
+    return false;
+end
+
+function getItem(collectible, currItem)
+	if currItem ~= nil then
+		return currItem;
+	end
+
+	local player = Isaac.GetPlayer(0);
+
+	player:GetEffects():AddCollectibleEffect(collectible, true);
+	local effect = player:GetEffects():GetCollectibleEffect(collectible);
+	return effect.Item;
+end
+
+function rotateVector(vec, dir)
+	if dir == Direction.UP then
+		return vec * -1;
+	elseif dir == Direction.RIGHT then
+		local tempX = vec.X;
+		vec.X = vec.Y;
+		vec.Y = -tempX;
+	elseif dir == Direction.LEFT then
+		return rotateVector(vec, Direction.RIGHT) * -1;
+	end
+
+	return vec;
+end

metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<metadata>
+    <name>Vazkii's Item Pack</name>
+    <directory>vip</directory>
+    <id>838903672</id>
+    <description>This mod adds a few new funky items to the game:
+
+- Eye of the Subconscious: Isaac stops being able to fire manually and will fire like Demon Baby.
+- Remote Control: Bombs move in the direction of Isaac's tears.
+- Bleeding Edge Tech: Technology that is aimed towards Isaac's moving familiars.
+- Action Worm: Moldable Worm type item.
+
+If you want to check them out in action, check out the video. I'll be adding more items as I come up with more cool ideas to add.
+
+Currently these do not spawn properly as there doesn't appear to be a way to get them in the item pools. You'll need to give them via the debug console.</description>
+    <version>1.0.1</version>
+    <visibility>Public</visibility>
+    <tag id="Items"/>
+</metadata>