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svg.py
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svg.py
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import xml.etree.ElementTree as ET
from dataclasses import dataclass, field
from typing import Literal, Dict, List, Tuple
from enum import Enum
import typing
import sys
import re
@dataclass
class Shape:
# type: Literal['rect', 'circle', 'ellipse', 'line', 'polyline', 'polygon', 'path']
params: Dict = field(repr=False)
stroke: str
stroke_width: int
fill: str
def __init__(self, params: Dict):
self.params = params
self.stroke = params.get('stroke', 'black')
self.stroke_width = params.get('stroke-width', 1)
self.fill = params.get('fill', 'transparent')
def render_with(self, renderer: 'SVGRenderer'):
pass
@dataclass
class RectSVG(Shape):
x: float # top left corner
y: float
width: float
height: float
def __init__(self, params: Dict):
super().__init__(params)
self.x = float(params.get('x', 0))
self.y = float(params.get('y', 0))
self.width = float(params['width'])
self.height = float(params['height'])
def render_with(self, renderer: 'SVGRenderer'):
return renderer.render_rect(self)
@dataclass
class CircleSVG(Shape):
center_x: float
center_y: float
radius: float
def __init__(self, params: Dict):
super().__init__(params)
self.center_x = float(params['cx'])
self.center_y = float(params['cy'])
self.radius = float(params['r'])
def render_with(self, renderer: 'SVGRenderer'):
return renderer.render_circle(self)
@dataclass
class EllipseSVG(Shape):
center_x: float
center_y: float
radius_x: float
radius_y: float
def __init__(self, params: Dict):
super().__init__(params)
self.center_x = float(params['cx'])
self.center_y = float(params['cy'])
self.radius_x = float(params['rx'])
self.radius_y = float(params['ry'])
def render_with(self, renderer: 'SVGRenderer'):
return renderer.render_ellipse(self)
@dataclass
class LineSVG(Shape):
x1: float
y1: float
x2: float
y2: float
def __init__(self, params: Dict):
super().__init__(params)
self.x1 = float(params['x1'])
self.y1 = float(params['y1'])
self.x2 = float(params['x2'])
self.y2 = float(params['y2'])
def render_with(self, renderer: 'SVGRenderer'):
return renderer.render_line(self)
@dataclass
class PolyLineSVG(Shape):
points: List[Tuple[float, float]]
def __init__(self, params: Dict):
super().__init__(params)
self.points = []
values = [float(x) for x in params['points'].split()]
if len(values) % 2 != 0:
raise ValueError('Invalid number of values in polyline points')
for i in range(0, len(values), 2):
self.points.append((values[i], values[i + 1]))
def render_with(self, renderer: 'SVGRenderer'):
return renderer.render_polyline(self)
@dataclass
class PolygonSVG(Shape):
points: List[Tuple[float, float]]
def __init__(self, params: Dict):
super().__init__(params)
self.points = []
values = [float(x) for x in params['points'].split()]
if len(values) % 2 != 0:
raise ValueError('Invalid number of values in polygon points')
for i in range(0, len(values), 2):
self.points.append((values[i], values[i + 1]))
def render_with(self, renderer: 'SVGRenderer'):
return renderer.render_polygon(self)
@dataclass
class PathCommand:
class Type(str, Enum):
Move = 'M'
Line = 'L'
Horizontal = 'H'
Vertical = 'V'
ClosePath = 'Z' # return to first point in path
CubicBezier = 'C'
StrungCubicBezier = 'S' # unsupported
QuadraticBezier = 'Q'
StrungQuadraticBezier = 'T' # unsupported
def __repr__(self):
return str(self).split('.')[-1]
type: Type
relative: bool
values: List[float]
@classmethod
def from_command_str(cls, command: str) -> List['PathCommand']:
# first character is the command type
type = PathCommand.Type(command[0].upper())
relative = command[0].islower()
value_strings = re.findall(r'\-?\d*\.?\d*', command[1:])
# split on spaces and commas
values = [float(x) for x in value_strings if x != '']
commands = []
if type == PathCommand.Type.CubicBezier and len(values) > 6:
for i in range(len(values) // 6):
commands.append(PathCommand(type, relative, values[i * 6:(i + 1) * 6]))
else:
commands.append(PathCommand(type, relative, values))
return commands
@dataclass
class PathSVG(Shape):
commands: List['PathCommand'] = field(default_factory=list)
def __init__(self, params):
super().__init__(params)
description = params['d']
command_strings = re.findall(r'([a-zA-Z][^a-zA-Z]+)', description)
self.commands = []
for command_str in command_strings:
self.commands.extend(PathCommand.from_command_str(command_str))
def __repr__(self):
base = super().__repr__()
indent = '\n' + ' ' * 4
return base + indent + indent.join(map(str, self.commands))
def render_with(self, renderer: 'SVGRenderer'):
return renderer.render_path(self)
@dataclass
class SVG:
width: float
height: float
shapes: List[Shape] = field(default_factory=list)
def __repr__(self):
indent = '\n' + ' ' * 2
shapes = indent + indent.join(map(str, self.shapes))
return f'SVG(width={self.width}, height={self.height}, shapes={shapes})'
class SVGRenderer():
"""
Interface for rendering SVG shapes using a visitor pattern.
"""
def __init__(self, svg: SVG):
self.svg = svg
def render_circle(self, circle: CircleSVG):
pass
def render_rect(self, rect: RectSVG):
pass
def render_ellipse(self, ellipse: EllipseSVG):
pass
def render_line(self, line: LineSVG):
pass
def render_polyline(self, polyline: PolyLineSVG):
pass
def render_polygon(self, polygon: PolygonSVG):
pass
def render_path(self, path: PathSVG):
pass
shape_classes = {
'rect': RectSVG,
'circle': CircleSVG,
'ellipse': EllipseSVG,
'line': LineSVG,
'polyline': PolyLineSVG,
'polygon': PolygonSVG,
'path': PathSVG,
}
def parse_shape(element: ET.Element) -> Shape:
# '{http://www.w3.org/2000/svg}rect' -> 'rect'
shape_type = element.tag.split('}')[1]
shape = shape_classes[shape_type](element.attrib)
return shape
def parse_svg(path: str):
tree = ET.parse(path)
root = tree.getroot()
width = height = 0
if 'viewBox' in root.attrib:
vals = [float(x) for x in root.attrib['viewBox'].split()]
width = vals[2]
height = vals[3]
elif 'width' in root.attrib and 'height' in root.attrib:
width = float(root.attrib['width'])
height = float(root.attrib['height'])
else:
raise ValueError('SVG must have width and height or viewbox')
svg = SVG(width, height)
for child in root:
shape = parse_shape(child)
svg.shapes.append(shape)
return svg
if __name__ == "__main__":
path = sys.argv[1] if len(sys.argv) > 1 else "svg_files/example.svg"
svg = parse_svg(path)