Sha256: 19169c264651182a6ede07a231936fe428d9f8ea4ff640a6b0c9ab65570d9431
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Size: 1.84 KB
Versions: 6
Compression:
Stored size: 1.84 KB
Contents
#
# Morph.
# see vecmath library for a variant using Vec2D instead of PVector
# Changing one shape into another by interpolating
# vertices from one to another
#
attr_reader :circle, :square, :morph, :state
def setup
size(640, 360)
@circle = []
@square = []
@morph = []
@state = false
# Create a circle using vectors pointing from center
(0 .. 360).step(9) do |angle|
# Note we are not starting from 0 in order to match the
# path of a circle.
v = PVector.from_angle(radians(angle-135))
v.mult(100)
circle << v
# Let's fill out morph Array with blank PVectors while we are at it
morph << PVector.new
end
# A square is a bunch of vertices along straight lines
# Top of square
(-50 .. 50).step(10) do |x|
square << PVector.new(x, -50)
end
# Right side
(-50 .. 50).step(10) do |y|
square << PVector.new(50, y)
end
# Bottom, NB: can't negative step ruby so use your loaf
5.downto(-5) do |x|
square << PVector.new(x * 10, 50)
end
# Left side
5.downto(-5) do |y|
square << PVector.new(-50, y * 10)
end
end
def draw
background(51)
# We will keep how far the vertices are from their target
total_distance = 0
# Look at each vertex
circle.length.times do |i|
# Are we lerping to the circle or square?
v1 = (state)? circle[i] : square[i]
# Get the vertex we will draw
v2 = morph[i]
# Lerp to the target
v2.lerp(v1, 0.1)
# Check how far we are from target
total_distance += PVector.dist(v1, v2)
end
# If all the vertices are close, switch shape
if (total_distance < 0.1)
@state = !state
end
# Draw relative to center
translate(width/2, height/2)
stroke_weight(4)
# Draw a polygon that makes up all the vertices
begin_shape
no_fill
stroke(255)
morph.each do |v|
vertex(v.x, v.y)
end
end_shape(CLOSE)
end
Version data entries
6 entries across 6 versions & 1 rubygems