summaryrefslogtreecommitdiff
path: root/boost_cart/cart_entity.lua
blob: 0105cf542c3399e3a4eac094ae518a9f8e3e8af4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399

local HAVE_MESECONS_ENABLED = minetest.global_exists("mesecon")

function boost_cart:on_rail_step(entity, pos, distance)
	-- Play rail sound
	if entity.sound_counter <= 0 then
		minetest.sound_play("cart_rail", {
			pos = pos,
			max_hear_distance = 40,
			gain = 0.5
		})
		entity.sound_counter = math.random(4, 15)
	end
	entity.sound_counter = entity.sound_counter - distance

	if HAVE_MESECONS_ENABLED then
		boost_cart:signal_detector_rail(pos)
	end
end

local cart_entity = {
	physical = false,
	collisionbox = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
	visual = "mesh",
	mesh = "cart.x",
	visual_size = {x=1, y=1},
	textures = {"cart.png"},

	driver = nil,
	punched = false, -- used to re-send velocity and position
	velocity = {x=0, y=0, z=0}, -- only used on punch
	old_dir = {x=1, y=0, z=0}, -- random value to start the cart on punch
	old_pos = nil,
	old_switch = 0,
	sound_counter = 0,
	railtype = nil,
	attached_items = {}
}

-- Model and textures
if boost_cart.mtg_compat then
	cart_entity.mesh = "carts_cart.b3d"
	cart_entity.textures = {"carts_cart.png"}
end

function cart_entity:on_rightclick(clicker)
	if not clicker or not clicker:is_player() then
		return
	end
	local player_name = clicker:get_player_name()
	if self.driver and player_name == self.driver then
		self.driver = nil
		boost_cart:manage_attachment(clicker, nil)
	elseif not self.driver then
		self.driver = player_name
		boost_cart:manage_attachment(clicker, self.object)
	end
end

function cart_entity:on_activate(staticdata, dtime_s)
	self.object:set_armor_groups({immortal=1})
	self.sound_counter = math.random(4, 15)

	if string.sub(staticdata, 1, string.len("return")) ~= "return" then
		return
	end
	local data = minetest.deserialize(staticdata)
	if type(data) ~= "table" then
		return
	end
	self.railtype = data.railtype
	if data.old_dir then
		self.old_dir = data.old_dir
	end
end

function cart_entity:get_staticdata()
	return minetest.serialize({
		railtype = self.railtype,
		old_dir = self.old_dir
	})
end

function cart_entity:on_punch(puncher, time_from_last_punch, tool_capabilities, direction)
	local pos = self.object:get_pos()
	local vel = self.object:get_velocity()
	if not self.railtype or vector.equals(vel, {x=0, y=0, z=0}) then
		local node = minetest.get_node(pos).name
		self.railtype = minetest.get_item_group(node, "connect_to_raillike")
	end

	if not puncher or not puncher:is_player() then
		local cart_dir = boost_cart:get_rail_direction(pos, self.old_dir, nil, nil, self.railtype)
		if vector.equals(cart_dir, {x=0, y=0, z=0}) then
			return
		end
		self.velocity = vector.multiply(cart_dir, 3)
		self.punched = true
		return
	end

	if puncher:get_player_control().sneak then
		-- Pick up cart: Drop all attachments
		if self.driver then
			if self.old_pos then
				self.object:set_pos(self.old_pos)
			end
			local player = minetest.get_player_by_name(self.driver)
			boost_cart:manage_attachment(player, nil)
		end
		for _, obj_ in pairs(self.attached_items) do
			if obj_ then
				obj_:set_detach()
			end
		end

		local leftover = puncher:get_inventory():add_item("main", "carts:cart")
		if not leftover:is_empty() then
			minetest.add_item(pos, leftover)
		end

		self.object:remove()
		return
	end

	-- Driver punches to accelerate the cart
	if puncher:get_player_name() == self.driver then
		if math.abs(vel.x + vel.z) > boost_cart.punch_speed_max then
			return
		end
	end

	local punch_dir = boost_cart:velocity_to_dir(puncher:get_look_dir())
	punch_dir.y = 0
	local cart_dir = boost_cart:get_rail_direction(pos, punch_dir, nil, nil, self.railtype)
	if vector.equals(cart_dir, {x=0, y=0, z=0}) then
		return
	end

	local punch_interval = 1
	if tool_capabilities and tool_capabilities.full_punch_interval then
		punch_interval = tool_capabilities.full_punch_interval
	end
	time_from_last_punch = math.min(time_from_last_punch or punch_interval, punch_interval)
	local f = 3 * (time_from_last_punch / punch_interval)

	self.velocity = vector.multiply(cart_dir, f)
	self.old_dir = cart_dir
	self.punched = true
end

local v3_len = vector.length
function cart_entity:on_step(dtime)
	local vel = self.object:get_velocity()
	if self.punched then
		vel = vector.add(vel, self.velocity)
		self.object:set_velocity(vel)
		self.old_dir.y = 0
	elseif vector.equals(vel, {x=0, y=0, z=0}) then
		return
	end

	local pos = self.object:get_pos()
	local cart_dir = boost_cart:velocity_to_dir(vel)
	local same_dir = vector.equals(cart_dir, self.old_dir)
	local update = {}

	if self.old_pos and not self.punched and same_dir then
		local flo_pos = vector.round(pos)
		local flo_old = vector.round(self.old_pos)
		if vector.equals(flo_pos, flo_old) then
			-- Do not check one node multiple times
			return
		end
	end

	local ctrl, player
	local distance = 1

	-- Get player controls
	if self.driver then
		player = minetest.get_player_by_name(self.driver)
		if player then
			ctrl = player:get_player_control()
		end
	end

	local stop_wiggle = false
	if self.old_pos and same_dir then
		-- Detection for "skipping" nodes (perhaps use average dtime?)
		-- It's sophisticated enough to take the acceleration in account
		local acc = self.object:get_acceleration()
		distance = dtime * (v3_len(vel) + 0.5 * dtime * v3_len(acc))

		local new_pos, new_dir = boost_cart:pathfinder(
			pos, self.old_pos, self.old_dir, distance, ctrl,
			self.old_switch, self.railtype
		)

		if new_pos then
			-- No rail found: set to the expected position
			pos = new_pos
			update.pos = true
			cart_dir = new_dir
		end
	elseif self.old_pos and cart_dir.y ~= -1 and not self.punched then
		-- Stop wiggle
		stop_wiggle = true
	end

	-- dir:         New moving direction of the cart
	-- switch_keys: Currently pressed L(1) or R(2) key,
	--              used to ignore the key on the next rail node
	local dir, switch_keys = boost_cart:get_rail_direction(
		pos, cart_dir, ctrl, self.old_switch, self.railtype
	)

	local new_acc = {x=0, y=0, z=0}
	if stop_wiggle or vector.equals(dir, {x=0, y=0, z=0}) then
		vel = {x=0, y=0, z=0}
		local pos_r = vector.round(pos)
		if not boost_cart:is_rail(pos_r, self.railtype) then
			pos = self.old_pos
		elseif not stop_wiggle then
			pos = pos_r
		else
			pos.y = math.floor(pos.y + 0.5)
		end
		update.pos = true
		update.vel = true
	else
		-- Direction change detected
		if not vector.equals(dir, self.old_dir) then
			vel = vector.multiply(dir, v3_len(vel))
			update.vel = true
			if dir.y ~= self.old_dir.y then
				pos = vector.round(pos)
				update.pos = true
			end
		end
		-- Center on the rail
		if dir.z ~= 0 and math.floor(pos.x + 0.5) ~= pos.x then
			pos.x = math.floor(pos.x + 0.5)
			update.pos = true
		end
		if dir.x ~= 0 and math.floor(pos.z + 0.5) ~= pos.z then
			pos.z = math.floor(pos.z + 0.5)
			update.pos = true
		end

		-- Calculate current cart acceleration
		local acc = nil

		local acc_meta = minetest.get_meta(pos):get_string("cart_acceleration")
		if acc_meta == "halt" and not self.punched then
			-- Stop rail
			vel = {x=0, y=0, z=0}
			acc = false
			pos = vector.round(pos)
			update.pos = true
			update.vel = true
		end
		if acc == nil then
			-- Meta speed modifier
			local speed_mod = tonumber(acc_meta)
			if speed_mod and speed_mod ~= 0 then
				-- Try to make it similar to the original carts mod
				acc = speed_mod * 10
			end
		end
		if acc == nil and boost_cart.mtg_compat then
			-- MTG Cart API adaption
			local rail_node = minetest.get_node(vector.round(pos))
			local railparam = carts.railparams[rail_node.name]
			if railparam and railparam.acceleration then
				acc = railparam.acceleration
			end
		end
		if acc == nil then
			-- Handbrake
			if ctrl and ctrl.down then
				acc = -2
			else
				acc = -0.4
			end
		end

		if acc then
			-- Slow down or speed up, depending on Y direction
			acc = acc + dir.y * -2
		else
			acc = 0
		end

		new_acc = vector.multiply(dir, acc)
	end

	-- Limits
	local max_vel = boost_cart.speed_max
	for _,v in pairs({"x","y","z"}) do
		if math.abs(vel[v]) > max_vel then
			vel[v] = boost_cart:get_sign(vel[v]) * max_vel
			new_acc[v] = 0
			update.vel = true
		end
	end

	self.object:set_acceleration(new_acc)
	self.old_pos = vector.round(pos)
	if not vector.equals(dir, {x=0, y=0, z=0}) and not stop_wiggle then
		self.old_dir = dir
	end
	self.old_switch = switch_keys

	boost_cart:on_rail_step(self, self.old_pos, distance)

	if self.punched then
		-- Collect dropped items
		for _, obj_ in pairs(minetest.get_objects_inside_radius(pos, 1)) do
			if not obj_:is_player() and
					obj_:get_luaentity() and
					not obj_:get_luaentity().physical_state and
					obj_:get_luaentity().name == "__builtin:item" then

				obj_:set_attach(self.object, "", {x=0, y=0, z=0}, {x=0, y=0, z=0})
				self.attached_items[#self.attached_items + 1] = obj_
			end
		end
		self.punched = false
		update.vel = true
	end

	if not (update.vel or update.pos) then
		return
	end

	local yaw = 0
	if self.old_dir.x < 0 then
		yaw = 0.5
	elseif self.old_dir.x > 0 then
		yaw = 1.5
	elseif self.old_dir.z < 0 then
		yaw = 1
	end
	self.object:set_yaw(yaw * math.pi)

	local anim = {x=0, y=0}
	if dir.y == -1 then
		anim = {x=1, y=1}
	elseif dir.y == 1 then
		anim = {x=2, y=2}
	end
	self.object:set_animation(anim, 1, 0)

	self.object:set_velocity(vel)
	if update.pos then
		self.object:set_pos(pos)
	end
end

minetest.register_entity(":carts:cart", cart_entity)

-- Register item to place the entity
if not boost_cart.mtg_compat then
	minetest.register_craftitem(":carts:cart", {
		description = "Cart (Sneak+Click to pick up)",
		inventory_image = minetest.inventorycube(
			"cart_top.png",
			"cart_side.png",
			"cart_side.png"
		),
		wield_image = "cart_side.png",
		on_place = function(itemstack, placer, pointed_thing)
			if not pointed_thing.type == "node" then
				return
			end
			if boost_cart:is_rail(pointed_thing.under) then
				minetest.add_entity(pointed_thing.under, "carts:cart")
			elseif boost_cart:is_rail(pointed_thing.above) then
				minetest.add_entity(pointed_thing.above, "carts:cart")
			else
				return
			end

			if not minetest.settings:get_bool("creative_mode") then
				itemstack:take_item()
			end
			return itemstack
		end,
	})

	minetest.register_craft({
		output = "carts:cart",
		recipe = {
			{"default:steel_ingot", "", "default:steel_ingot"},
			{"default:steel_ingot", "default:steel_ingot", "default:steel_ingot"},
		},
	})
end