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Contents
#
# Bouncing Ball with Vectors
# by Daniel Shiffman.
#
# Demonstration of using vectors to control motion of body
# This example is not object-oriented
# See AccelerationWithVectors for an example of how to simulate motion using vectors in an object
# See library/vecmath for more ruby like Vec2D and Vec3D examples
#
attr_reader :location, # Location of shape
:velocity, # Velocity of shape
:gravity # Gravity acts at the shape's acceleration
def setup
size(640,360)
smooth
@location = PVector.new(100,100)
@velocity = PVector.new(1.5,2.1)
@gravity = PVector.new(0,0.2)
end
def draw
background(0)
# Add velocity to the location.
location.add(velocity)
# Add gravity to velocity
velocity.add(gravity)
# Bounce off edges
if ((location.x > width) || (location.x < 0))
velocity.x = velocity.x * -1
end
if (location.y > height)
# We're reducing velocity ever so slightly
# when it hits the bottom of the window
velocity.y = velocity.y * -0.95
location.y = height
end
# Display circle at location vector
stroke(255)
stroke_weight(2)
fill(127)
ellipse(location.x,location.y,48,48)
end
Version data entries
6 entries across 6 versions & 1 rubygems