/usr/lib/python2.7/dist-packages/uniconvertor/app/Graphics/gradient.py is in python-uniconvertor 1.1.5-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | # Sketch - A Python-based interactive drawing program
# Copyright (C) 1997, 1998 by Bernhard Herzog
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# color gradient classes
#
from blend import Blend, MismatchError
class Gradient:
def __init__(self, duplicate = None):
pass
def ColorAt(self, pos):
pass
def Duplicate(self):
return self.__class__(duplicate = self)
class MultiGradient(Gradient):
def __init__(self, colors = (), duplicate = None):
if duplicate is not None:
self.colors = duplicate.colors[:]
else:
if len(colors) < 2:
raise ValueError, 'at least 2 colors required'
self.colors = colors
def StartColor(self):
return self.colors[0][-1]
def SetStartColor(self, color):
undo = (self.SetStartColor, self.colors[0][-1])
self.colors[0] = (0, color)
return undo
def EndColor(self):
return self.colors[-1][-1]
def SetEndColor(self, color):
undo = (self.SetEndColor, self.colors[-1][-1])
self.colors[-1] = (1, color)
return undo
def ColorAt(self, pos):
colors = self.colors
for i in range(len(colors) - 1):
if colors[i][0] <= pos and colors[i + 1][0] >= pos:
break
else:
return self.EndColor()
start_pos, start_color = colors[i]
if i < len(colors) - 1:
end_pos, end_color = colors[i + 1]
else:
return start_color
return Blend(end_color, start_color,
(pos - start_pos) / float(end_pos - start_pos))
def Sample(self, num):
colors = self.colors
max = num - 1.0
pos1, color1 = colors[0]
pos2, color2 = colors[1]
diff = float(pos2 - pos1)
cur = 1
result = []
blend = color1.Blend
for i in range(num):
frac = i / max
while frac > pos2:
pos1 = pos2; color1 = color2
cur = cur + 1
pos2, color2 = colors[cur]
diff = float(pos2 - pos1)
blend = color1.Blend
frac = (frac - pos1) / diff
result.append(blend(color2, 1 - frac, frac))
return result
def Colors(self):
return self.colors
def SetColors(self):
undo = (self.SetColors, self.colors)
self.colors = colors
return undo
def Blend(self, other, frac1, frac2):
if type(other) == type(self.colors[0][-1]):
# blend a gradient with a single color
sc = self.colors
c = []
for i in range(len(sc)):
p1, c1 = sc[i]
c.append((p1, c1.Blend(other, frac1, frac2)))
return self.__class__(c)
elif other.__class__ == self.__class__:
# blend two MultiGradient instances
# XXX: improve this...
length = min(len(self.colors), len(other.colors))
sc = self.colors[:length - 1]
sc.append(self.colors[-1])
oc = other.colors[:length - 1]
oc.append(other.colors[-1])
c = []
for i in range(length):
p1, c1 = sc[i]
p2, c2 = oc[i]
c.append((frac1 * p1 + frac2 * p2,
Blend(c1, c2, frac1, frac2)))
return self.__class__(c)
else:
raise MismatchError
def SaveToFile(self, file):
file.Gradient(self.colors)
# convenience function for the most common gradient type
def CreateSimpleGradient(start, end):
return MultiGradient([(0, start), (1, end)])
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