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71 lines
2.4 KiB
Python
71 lines
2.4 KiB
Python
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# A CSplit is a Clock-shaped split: the children are grouped in a circle.
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# The numbering is a little different from a real clock: the 12 o'clock
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# position is called 0, not 12. This is a little easier since Python
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# usually counts from zero. (BTW, there needn't be exactly 12 children.)
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from math import pi, sin, cos
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from Split import Split
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class CSplit() = Split():
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#
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def minsize(self, m):
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# Since things look best if the children are spaced evenly
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# along the circle (and often all children have the same
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# size anyway) we compute the max child size and assume
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# this is each child's size.
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width, height = 0, 0
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for child in self.children:
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wi, he = child.minsize(m)
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width = max(width, wi)
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height = max(height, he)
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# In approximation, the diameter of the circle we need is
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# (diameter of box) * (#children) / pi.
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# We approximate pi by 3 (so we slightly overestimate
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# our minimal size requirements -- not so bad).
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# Because the boxes stick out of the circle we add the
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# box size to each dimension.
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# Because we really deal with ellipses, do everything
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# separate in each dimension.
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n = len(self.children)
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return width + (width*n + 2)/3, height + (height*n + 2)/3
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#
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def getbounds(self):
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return self.bounds
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#
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def setbounds(self, bounds):
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self.bounds = bounds
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# Place the children. This involves some math.
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# Compute center positions for children as if they were
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# ellipses with a diameter about 1/N times the
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# circumference of the big ellipse.
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# (There is some rounding involved to make it look
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# reasonable for small and large N alike.)
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# XXX One day Python will have automatic conversions...
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n = len(self.children)
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fn = float(n)
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if n = 0: return
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(left, top), (right, bottom) = bounds
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width, height = right-left, bottom-top
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child_width, child_height = width*3/(n+4), height*3/(n+4)
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half_width, half_height = \
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float(width-child_width)/2.0, \
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float(height-child_height)/2.0
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center_h, center_v = center = (left+right)/2, (top+bottom)/2
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fch, fcv = float(center_h), float(center_v)
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alpha = 2.0 * pi / fn
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for i in range(n):
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child = self.children[i]
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fi = float(i)
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fh, fv = \
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fch + half_width*sin(fi*alpha), \
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fcv - half_height*cos(fi*alpha)
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left, top = \
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int(fh) - child_width/2, \
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int(fv) - child_height/2
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right, bottom = \
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left + child_width, \
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top + child_height
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child.setbounds((left, top), (right, bottom))
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#
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