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drawing.py
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drawing.py
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from io import StringIO
import base64
import urllib.parse
import re
from collections import defaultdict
from . import Raster
from . import elements as elementsModule
STRIP_CHARS = ('\x00\x01\x02\x03\x04\x05\x06\x07\x08\x0b\x0c\x0e\x0f\x10\x11'
'\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f')
class Drawing:
''' A canvas to draw on
Supports iPython: If a Drawing is the last line of a cell, it will be
displayed as an SVG below. '''
def __init__(self, width, height, origin=(0,0), idPrefix='d',
displayInline=True, **svgArgs):
assert float(width) == width
assert float(height) == height
self.width = width
self.height = height
if origin == 'center':
self.viewBox = (-width/2, -height/2, width, height)
else:
origin = tuple(origin)
assert len(origin) == 2
self.viewBox = origin + (width, height)
self.viewBox = (self.viewBox[0], -self.viewBox[1]-self.viewBox[3],
self.viewBox[2], self.viewBox[3])
self.elements = []
self.orderedElements = defaultdict(list)
self.otherDefs = []
self.pixelScale = 1
self.renderWidth = None
self.renderHeight = None
self.idPrefix = str(idPrefix)
self.displayInline = displayInline
self.svgArgs = {}
for k, v in svgArgs.items():
k = k.replace('__', ':')
k = k.replace('_', '-')
if k[-1] == '-':
k = k[:-1]
self.svgArgs[k] = v
self.idIndex = 0
def setRenderSize(self, w=None, h=None):
self.renderWidth = w
self.renderHeight = h
return self
def setPixelScale(self, s=1):
self.renderWidth = None
self.renderHeight = None
self.pixelScale = s
return self
def calcRenderSize(self):
if self.renderWidth is None and self.renderHeight is None:
return (self.width * self.pixelScale,
self.height * self.pixelScale)
elif self.renderWidth is None:
s = self.renderHeight / self.height
return self.width * s, self.renderHeight
elif self.renderHeight is None:
s = self.renderWidth / self.width
return self.renderWidth, self.height * s
else:
return self.renderWidth, self.renderHeight
def draw(self, obj, *, z=None, **kwargs):
if obj is None:
return
if not hasattr(obj, 'writeSvgElement'):
elements = obj.toDrawables(elements=elementsModule, **kwargs)
else:
assert len(kwargs) == 0
elements = (obj,)
self.extend(elements, z=z)
def append(self, element, *, z=None):
if z is not None:
self.orderedElements[z].append(element)
else:
self.elements.append(element)
def extend(self, iterable, *, z=None):
if z is not None:
self.orderedElements[z].extend(iterable)
else:
self.elements.extend(iterable)
def insert(self, i, element):
self.elements.insert(i, element)
def remove(self, element):
self.elements.remove(element)
def clear(self):
self.elements.clear()
def index(self, *args, **kwargs):
return self.elements.index(*args, **kwargs)
def count(self, element):
return self.elements.count(element)
def reverse(self):
self.elements.reverse()
def drawDef(self, obj, **kwargs):
if not hasattr(obj, 'writeSvgElement'):
elements = obj.toDrawables(elements=elementsModule, **kwargs)
else:
assert len(kwargs) == 0
elements = (obj,)
self.otherDefs.extend(elements)
def appendDef(self, element):
self.otherDefs.append(element)
def allElements(self):
''' Returns self.elements and self.orderedElements as a single list. '''
output = list(self.elements)
for z in sorted(self.orderedElements):
output.extend(self.orderedElements[z])
return output
def asSvg(self, outputFile=None):
returnString = outputFile is None
if returnString:
outputFile = StringIO()
imgWidth, imgHeight = self.calcRenderSize()
startStr = '''<?xml version="1.0" encoding="UTF-8"?>
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
width="{}" height="{}" viewBox="{} {} {} {}"'''.format(
imgWidth, imgHeight, *self.viewBox)
endStr = '</svg>'
outputFile.write(startStr)
elementsModule.writeXmlNodeArgs(self.svgArgs, outputFile)
outputFile.write('>\n<defs>\n')
# Write definition elements
def idGen(base=''):
idStr = self.idPrefix + base + str(self.idIndex)
self.idIndex += 1
return idStr
prevSet = set((id(defn) for defn in self.otherDefs))
def isDuplicate(obj):
nonlocal prevSet
dup = id(obj) in prevSet
prevSet.add(id(obj))
return dup
for element in self.otherDefs:
try:
element.writeSvgElement(idGen, isDuplicate, outputFile, False)
outputFile.write('\n')
except AttributeError:
pass
allElements = self.allElements()
for element in allElements:
try:
element.writeSvgDefs(idGen, isDuplicate, outputFile, False)
except AttributeError:
pass
outputFile.write('</defs>\n')
# Generate ids for normal elements
prevDefSet = set(prevSet)
for element in allElements:
try:
element.writeSvgElement(idGen, isDuplicate, outputFile, True)
except AttributeError:
pass
prevSet = prevDefSet
# Write normal elements
for element in allElements:
try:
element.writeSvgElement(idGen, isDuplicate, outputFile, False)
outputFile.write('\n')
except AttributeError:
pass
outputFile.write(endStr)
if returnString:
return outputFile.getvalue()
def saveSvg(self, fname, encoding='utf-8'):
with open(fname, 'w', encoding=encoding) as f:
self.asSvg(outputFile=f)
def savePng(self, fname):
self.rasterize(toFile=fname)
def rasterize(self, toFile=None):
if toFile:
return Raster.fromSvgToFile(self.asSvg(), toFile)
else:
return Raster.fromSvg(self.asSvg())
def _repr_svg_(self):
''' Display in Jupyter notebook '''
if not self.displayInline:
return None
return self.asSvg()
def _repr_html_(self):
''' Display in Jupyter notebook '''
if self.displayInline:
return None
prefix = b'data:image/svg+xml;base64,'
data = base64.b64encode(self.asSvg().encode(encoding='utf-8'))
src = (prefix+data).decode(encoding='ascii')
return '<img src="{}">'.format(src)
def asDataUri(self, strip_chars=STRIP_CHARS):
''' Returns a data URI with base64 encoding. '''
data = self.asSvg()
search = re.compile('|'.join(strip_chars))
data_safe = search.sub(lambda m: '', data)
b64 = base64.b64encode(data_safe.encode())
return 'data:image/svg+xml;base64,' + b64.decode(encoding='ascii')
def asUtf8DataUri(self, unsafe_chars='"', strip_chars=STRIP_CHARS):
''' Returns a data URI without base64 encoding.
The characters '#&%' are always escaped. '#' and '&' break parsing
of the data URI. If '%' is not escaped, plain text like '%50' will
be incorrectly decoded to 'P'. The characters in `strip_chars`
cause the SVG not to render even if they are escaped. '''
data = self.asSvg()
unsafe_chars = (unsafe_chars or '') + '#&%'
replacements = {
char: urllib.parse.quote(char, safe='')
for char in unsafe_chars
}
replacements.update({
char: ''
for char in strip_chars
})
search = re.compile('|'.join(map(re.escape, replacements.keys())))
data_safe = search.sub(lambda m: replacements[m.group(0)], data)
return 'data:image/svg+xml;utf8,' + data_safe