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
|
local world = require "world"
local pi = math.pi
local obj = {}
obj.max_size = 20
local types = {}
function obj.load_types()
for _, f in ipairs(love.filesystem.getDirectoryItems "objects") do
local ts = assert(love.filesystem.load("objects/"..f))()
for t, v in pairs(ts) do
types[t] = v
end
end
end
function obj.new(type, pos, data, ...)
world.last_id = world.last_id + 1
local o = setmetatable(
{id = world.last_id, data = data or {}, type = type}, obj)
o.data.pos = pos
o:init(...)
return o
end
function obj.load(id, data)
local o = setmetatable({id = id, data = data, type = data.type}, obj)
o:init()
return o
end
function obj.get(id)
return world.objects[id]
end
function obj.is_obj(v)
return getmetatable(v) == obj
end
function obj.in_box(x1, y1, x2, y2)
return coroutine.wrap(function()
for x = x1, x2 + world.chunk_size, world.chunk_size do
for y = y1, y2 + world.chunk_size, world.chunk_size do
for _, o in pairs(world.chunk(x, y).objects) do
local x, y = unpack(o.data.pos)
if x >= x1 and x <= x2 and y >= y1 and y <= y2 then
coroutine.yield(o)
end
end
end
end
end)
end
function obj.at(x, y)
return coroutine.wrap(function()
for o in obj.in_box(
x - obj.max_size, y - obj.max_size,
x + obj.max_size, y + obj.max_size) do
if o:in_hitbox(x, y) then
coroutine.yield(o)
end
end
end)
end
function obj.all()
return coroutine.wrap(function()
for _, o in pairs(world.objects) do
coroutine.yield(o)
end
end)
end
function obj:__index(v)
if obj[v] then
return obj[v]
else
return types[rawget(self, "type")][v]
end
end
function obj:overload(m, ...)
if types[self.type][m] then
return types[self.type][m](self, ...)
end
end
function obj:init(...)
self.chunk = world.chunk(unpack(self.data.pos))
self.chunk.objects[self.id] = self
world.objects[self.id] = self
self.data.vel = self.data.vel or {0, 0}
self.data.avel = self.data.avel or 0
return self:overload("init", ...)
end
function obj:tick(...)
local vx, vy = unpack(self.data.vel)
self.data.pos[1] = self.data.pos[1] + vx
self.data.pos[2] = self.data.pos[2] + vy
self.data.angle = (self.data.angle or 0) + self.data.avel / pi
if self.hitbox then
local x, y = unpack(self.data.pos)
for o in obj.in_box(
x - obj.max_size, y - obj.max_size,
x + obj.max_size, y + obj.max_size) do
if o.hitbox and o ~= self then
local dist = o.hitbox + self.hitbox
local ox, oy = unpack(o.data.pos)
local dx, dy = ox - x, oy - y
if dx*dx + dy*dy < dist*dist then
local angle = math.atan2(dy, dx)
self:collision(o, angle)
o:collision(self, pi - angle)
-- reposition self outside of collided object
self.data.pos[1] =
self.data.pos[1] - math.cos(angle) * dist + dx
self.data.pos[2] =
self.data.pos[2] - math.sin(angle) * dist + dy
self:collision_exit(o, angle)
o:collision_exit(self, pi - angle)
end
end
end
end
self:overload("tick", ...)
local chunk = world.chunk(unpack(self.data.pos))
if chunk ~= self.chunk then
self.chunk.objects[self.id] = nil
chunk.objects[self.id] = self
self.chunk = chunk
end
end
function obj:draw(...)
love.graphics.push()
love.graphics.translate(unpack(self.data.pos))
if self.data.angle then
love.graphics.rotate(self.data.angle)
end
self:overload("draw", ...)
love.graphics.pop()
end
function obj:collision(collided, angle)
self.force = {collided.data.vel[1] * math.cos(angle),
collided.data.vel[2] * math.sin(angle)}
self.torque = -collided.data.avel
return self:overload("collision", collided, angle, self.force)
end
function obj:collision_exit(collided, angle)
self.data.vel[1] = self.data.vel[1] + self.force[1]
self.data.vel[2] = self.data.vel[2] + self.force[2]
collided.data.vel[1] = collided.data.vel[1] - self.force[1]
collided.data.vel[2] = collided.data.vel[2] - self.force[2]
self.data.avel = self.data.avel + self.torque
collided.data.avel = collided.data.avel + self.torque
return self:overload("collision_exit", collided, angle, self.force)
end
function obj:in_hitbox(px, py)
local x, y = unpack(self.data.pos)
local dx, dy = x - px, y - py
return dx*dx + dy*dy < self.hitbox*self.hitbox
end
function obj:remove()
self.chunk.objects[self.id] = nil
world.objects[self.id] = nil
return self:overload "remove"
end
return obj
|
