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Contents
#
# Bouncy Bubbles
# based on code from Keith Peters.
#
# Multiple-object collision.
#
SPRING = 0.05
GRAVITY = 0.03
FRICTION = -0.9
NUM_BALLS = 12
attr_reader :balls, :id
def setup
size(640, 360)
@balls = []
(0 ... NUM_BALLS).each do |i|
balls << Ball.new(rand(width), rand(height), rand(30 .. 70), i, balls)
end
noStroke
fill(255, 204)
end
def draw
background(0)
(0 ... NUM_BALLS).each do |i|
balls[i].collide
balls[i].move
balls[i].display
end
end
class Ball
attr_accessor :vx, :vy
attr_reader :x, :y, :diameter, :others, :id, :width, :height
def initialize(xin, yin, din, idin, oin)
@x = xin
@y = yin
@diameter = din
@id = idin
@vx = 0
@vy = 0
@others = oin
@width = $app.width
@height = $app.height
end
def collide
((id + 1) ... NUM_BALLS).each do |i|
dx = others[i].x - x
dy = others[i].y - y
sq_dist = dx*dx + dy*dy
min_dist = (others[i].diameter/2 + diameter/2)
sq_min_dist = min_dist * min_dist
if (sq_dist < sq_min_dist)
angle = atan2(dy, dx)
target_x = x + cos(angle) * min_dist
target_y = y + sin(angle) * min_dist
ax = (target_x- others[i].x) * SPRING
ay = (target_y - others[i].y) * SPRING
@vx -= ax
@vy -= ay
others[i].vx += ax
others[i].vy += ay
end
end
def move
@vy += GRAVITY
@x += vx
@y += vy
if (x + diameter/2 > width)
@x = width - diameter/2
@vx *= FRICTION
elsif (x - diameter/2 < 0)
@x = diameter/2
@vx *= FRICTION
end
if (y + diameter/2 > height)
@y = height - diameter/2
@vy *= FRICTION
elsif (y - diameter/2 < 0)
@y = diameter/2
@vy *= FRICTION
end
end
def display
ellipse(x, y, diameter, diameter)
end
end
end
Version data entries
4 entries across 4 versions & 1 rubygems