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Contents
# The Nature of Code
# Daniel Shiffman
# http:#natureofcode.com
# "Landscape" example
class Landscape
include Processing::Proxy
attr_reader :scl, :w, :h, :rows, :cols, :z, :zoff
def initialize(scl, w, h)
@scl, @w, @h = scl, w, h
@cols = w / scl
@rows = h / scl
@z = Array.new(cols, Array.new(rows, 0.0))
end
# Calculate height values (based off a neural network)
def calculate(nn)
val = ->(curr, nn, x, y){curr * 0.95 + 0.05 * (nn.feed_forward([x, y]) * 280.0 - 140.0)}
@z = (0 ... cols).map{|i|
(0 ... rows).map{|j|
val.call(z[i][j], nn, i * 1.0/ cols, j * 1.0/cols)
}
}
end
# Render landscape as grid of quads
def render
# Every cell is an individual quad
# (could use quad_strip here, but produces funny results, investigate this)
(0 ... z.size - 1).each do |x|
(0 ... z[0].size - 1).each do |y|
# one quad at a time
# each quad's color is determined by the height value at each vertex
# (clean this part up)
no_stroke
push_matrix
begin_shape(QUADS)
translate(x * scl - w * 0.5, y * scl - h * 0.5, 0)
fill(z[x][y]+127, 220)
vertex(0, 0, z[x][y])
fill(z[x+1][y]+127, 220)
vertex(scl, 0, z[x+1][y])
fill(z[x+1][y+1]+127, 220)
vertex(scl, scl, z[x+1][y+1])
fill(z[x][y+1]+127, 220)
vertex(0, scl, z[x][y+1])
end_shape
pop_matrix
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems