Game Development Reference
In-Depth Information
111
window
=
GameWindow
.
new
112
window
.
show
Run the program, zoom with up / down arrows and regenerate everything with spacebar.
$
ruby 02-warmup/perlin_noise_map.rb
Map generated with Perlin noise
This is a little longer than our previous examples, so we will analyze some parts to make it
clear.
81
def
generate_map
82
noises
=
Perlin
::
Noise
.
new(
2
)
83
contrast
=
Perlin
::
Curve
.
contrast(
84
Perlin
::
Curve
::
CUBIC
,
2
)
85
map
=
{}
86
MAP_WIDTH
.
times
do
|
x
|
87
map
[
x
] =
{}
88
MAP_HEIGHT
.
times
do
|
y
|
89
n
=
noises
[
x
* 0.1
, y
* 0.1]
90
n
=
contrast
.
call(n)
91
map
[
x
][
y
] =
choose_tile(n)
92
end
93
end
94
map
95
end
generate_map
is the heart of this program. It creates two dimensional
Perlin::Noise
generator, then chooses a random tile for each location of the map,
according to noise value. To make the map a little sharper, cubic contrast is applied to noise
value before choosing the tile. Try commenting out contrast application - it will look like a
boring golf course, since noise values will keep buzzing around the middle.
