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
|
--[[
Lua star example - Run with love (https://love2d.org/)
Copyright 2018 Wesley Werner <wesley.werner@gmail.com>
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
]]--
local luastar = require("lua-star")
-- a 2D map where true is open and false is blocked
local map = { }
local mapsize = 10
local screensize = 500
local tilesize = screensize / mapsize
-- path start and end
local path = nil
local start = { x = 1, y = 10 }
local goal = { x = 10, y = 1 }
function love.load()
love.window.setMode( screensize, screensize )
-- build an open map
for x=1, mapsize do
map[x] = {}
for y=1, mapsize do
map[x][y] = true
end
end
requestPath()
end
function love.keypressed(key)
if key == "escape" then
love.event.quit()
end
end
function love.draw()
-- draw walls
love.graphics.setColor(255, 255, 255)
for x=1, mapsize do
for y=1, mapsize do
local fillstyle = "line"
if map[x][y] == false then fillstyle = "fill" end
love.graphics.rectangle(fillstyle, (x-1)*tilesize, (y-1)*tilesize, tilesize, tilesize)
end
end
-- draw start and end
love.graphics.print("START", (start.x-1) * tilesize, (start.y-1) * tilesize)
love.graphics.print("GOAL", (goal.x-1) * tilesize, (goal.y-1) * tilesize)
-- draw the path
if path then
for i, p in ipairs(path) do
love.graphics.setColor(0, 128, 0)
love.graphics.rectangle("fill", (p.x-1)*tilesize, (p.y-1)*tilesize, tilesize, tilesize)
love.graphics.setColor(255, 255, 255)
love.graphics.print(i, (p.x-1) * tilesize, (p.y-1) * tilesize)
end
end
end
function love.mousepressed( x, y, button, istouch )
local dx = math.floor(x / tilesize) + 1
local dy = math.floor(y / tilesize) + 1
map[dx][dy] = not map[dx][dy]
requestPath()
end
function positionIsOpenFunc(x, y)
-- should return true if the position is open to walk
return map[x][y]
end
function requestPath()
path = luastar:find(mapsize, mapsize, start, goal, positionIsOpenFunc)
end
|
