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Versions: 9
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Contents
#
# Scribble Plotter
# by Ira Greenberg.
#
# Using 2-dimensional arrays, record end points
# and replot scribbles between points.
#
SCRIBBLE = 0
HATCHING = 1
attr_reader :xy
def setup
size(640, 360)
background(0)
# Record points
# X positions
x = [125, 475, 475, 125]
# Y positions
y = [100, 100, 260, 260]
@xy = [x, y]
# Call plotting function
make_rect(xy)
end
def make_rect(pts)
stroke(255)
# Scribble variables, that get passed as arguments to the scribble function
steps = 100
scrib_val = 3.0
(0 ... xy.length).each do |i|
# Plots vertices
stroke_weight(5)
point(pts[0][i], pts[1][i])
# Call scribble function
stroke_weight(0.5)
if (i > 0)
scribble(pts[0][i], pts[1][i], pts[0][i-1], pts[1][i-1], steps, scrib_val, SCRIBBLE)
end
if (i == pts[0].length-1)
# Show some hatching between last 2 points
scribble(pts[0][i], pts[1][i], pts[0][0], pts[1][0], steps, scrib_val*2, HATCHING)
end
end
end
# Scribble function plots lines between end points,
# determined by steps and scrib_val arguments.
# two styles are available: SCRIBBLE and HATCHING, which
# are interestingly only dependent on parentheses
# placement in the line function calls.
def scribble(x1, y1, x2, y2, steps, scrib_val, style)
x_step = (x2-x1) / steps
y_step = (y2-y1) / steps
(0 ... steps).each do |i|
if(style == SCRIBBLE)
if (i < steps-1)
line(x1, y1, x1 += x_step+rand(-scrib_val .. scrib_val), y1 += y_step + rand(-scrib_val .. scrib_val))
else
# extra line needed to attach line back to point- not necessary in HATCHING style
line(x1, y1, x2, y2)
end
elsif (style == HATCHING)
line(x1, y1, (x1 += x_step)+rand(-scrib_val .. scrib_val), (y1 += y_step) + rand(-scrib_val .. scrib_val))
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems