cduck.me
1
2from .elements import DrawingElement, DrawingParentElement
3
4
5class DrawingDef(DrawingParentElement):
6 ''' Parent class of SVG nodes that must be direct children of <defs> '''
7 def getSvgDefs(self):
8 return (self,)
9 def writeSvgDefs(self, idGen, isDuplicate, outputFile):
10 DrawingElement.writeSvgDefs(idGen, isDuplicate, outputFile)
11
12class DrawingDefSub(DrawingParentElement):
13 ''' Parent class of SVG nodes that are meant to be descendants of a Def '''
14 pass
15
16class LinearGradient(DrawingDef):
17 ''' A linear gradient to use as a fill or other color
18
19 Has <stop> nodes as children. '''
20 TAG_NAME = 'linearGradient'
21 def __init__(self, x1, y1, x2, y2, gradientUnits='userSpaceOnUse', **kwargs):
22 yShift = 0
23 if gradientUnits != 'userSpaceOnUse':
24 yShift = 1
25 try: y1 = yShift - y1
26 except TypeError: pass
27 try: y2 = yShift - y2
28 except TypeError: pass
29 super().__init__(x1=x1, y1=y1, x2=x2, y2=y2, gradientUnits=gradientUnits,
30 **kwargs)
31 def addStop(self, offset, color, opacity=None, **kwargs):
32 stop = GradientStop(offset=offset, stop_color=color,
33 stop_opacity=opacity, **kwargs)
34 self.append(stop)
35
36class RadialGradient(DrawingDef):
37 ''' A radial gradient to use as a fill or other color
38
39 Has <stop> nodes as children. '''
40 TAG_NAME = 'radialGradient'
41 def __init__(self, cx, cy, r, gradientUnits='userSpaceOnUse', fy=None, **kwargs):
42 yShift = 0
43 if gradientUnits != 'userSpaceOnUse':
44 yShift = 1
45 try: cy = yShift - cy
46 except TypeError: pass
47 try: fy = yShift - fy
48 except TypeError: pass
49 super().__init__(cx=cx, cy=cy, r=r, gradientUnits=gradientUnits,
50 fy=fy, **kwargs)
51 def addStop(self, offset, color, opacity=None, **kwargs):
52 stop = GradientStop(offset=offset, stop_color=color,
53 stop_opacity=opacity, **kwargs)
54 self.append(stop)
55
56class GradientStop(DrawingDefSub):
57 ''' A control point for a radial or linear gradient '''
58 TAG_NAME = 'stop'
59 hasContent = False
60
61class ClipPath(DrawingDef):
62 ''' A shape used to crop another element by not drawing outside of this
63 shape
64
65 Has regular drawing elements as children. '''
66 TAG_NAME = 'clipPath'
67