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Contents
#
# Class used to evaluate a bspline.
#
class FXSpline
OS = 1.0 / 6.0
FS = 4.0 / 6.0
def self.bspline_solve( r, p, num )
ax = -OS * p[0][0] + 0.5 * p[1][0] - 0.5 * p[2][0] + OS * p[3][0]
bx = 0.5 * p[0][0] - p[1][0] + 0.5 * p[2][0]
cx = -0.5 * p[0][0] + 0.5 * p[2][0]
dx = OS * p[0][0] + FS * p[1][0] + OS * p[2][0]
ay = -OS * p[0][1] + 0.5 * p[1][1] - 0.5 * p[2][1] + OS * p[3][1]
by = 0.5 * p[0][1] - p[1][1] + 0.5 * p[2][1]
cy = -0.5 * p[0][1] + 0.5 * p[2][1]
dy = OS * p[0][1] + FS * p[1][1] + OS * p[2][1]
t = 0.0
tinc = 1.0 / num
0.upto(num) {
x = t * (t * (t * ax + bx) + cx) + dx
y = t * (t * (t * ay + by) + cy) + dy
r << [ x, y ]
t += tinc
}
end
def self.bspline(p)
pts = []
0.upto(p.size-4) { |x|
x2 = p[x+2][0] - p[x+1][0]
x2 = x2 * x2
y2 = p[x+2][1] - p[x+1][1]
y2 = y2 * y2
num = Math.sqrt( x2 + y2 ).to_i / 16
bspline_solve(pts, p[x..x+3], num)
}
return pts
end
end
class FXDC
# Draw a bspline curve of any number of segments
def drawBSpline(p)
tmp = FXSpline::bspline(p)
pts = tmp.collect { |x| FXPoint.new( x[0].to_i, x[1].to_i) }
drawLines(pts)
return pts
end
end
Version data entries
34 entries across 34 versions & 1 rubygems