Sha256: 51a890c744981982faece499d38b3041ebee5e6ef324b49eaca0c8b73cde4d24
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Size: 1.07 KB
Versions: 9
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Stored size: 1.07 KB
Contents
#
# Moving On Curves.
#
# In this example, the circles moves along the curve y = x^4.
# Click the mouse to have it move to a new position.
#
STEP = 0.01 # Size of each step along the path
attr_reader :exponent, :begin_x, :begin_y, :end_x, :end_y, :dist_x, :dist_y, :pct, :x, :y
def setup
size(640, 360)
@begin_x = 20.0 # Initial x-coordinate
@begin_y = 10.0 # Initial y-coordinate
@end_x = 570.0 # Final x-coordinate
@end_y = 320.0 # Final y-coordinate
@exponent = 4 # Determines the curve
@x = 0.0 # Current x-coordinate
@y = 0.0 # Current y-coordinate
@pct = 0.0 # Percentage traveled (0.0 to 1.0)
no_stroke
@dist_x = end_x - begin_x
@dist_y = end_y - begin_y
end
def draw
fill(0, 2)
rect(0, 0, width, height)
@pct += STEP
if (pct < 1.0)
@x = begin_x + (pct * dist_x)
@y = begin_y + (pow(pct, exponent) * dist_y)
end
fill(255)
ellipse(x, y, 20, 20)
end
def mouse_pressed
@pct = 0.0
@begin_x = x
@begin_y = y
end_x = mouse_x
end_y = mouse_y
@dist_x = end_x - begin_x
@dist_y = end_y - begin_y
end
Version data entries
9 entries across 9 versions & 1 rubygems