301 lines
10 KiB
Python
301 lines
10 KiB
Python
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#!/usr/bin/env python3
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import os
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import inkex
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import voronoi
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from inkex.transforms import Transform
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from inkex.paths import CubicSuperPath, Path
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from PIL import Image
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from lxml import etree
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import base64
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from io import BytesIO
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import urllib.request as urllib
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# A tool for making polygonal art. Can be created with one click with a pass.
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class Point:
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def __init__(self, x, y):
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self.x = x
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self.y = y
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def __lt__(self,other):
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return (self.x*self.y<other.x*other.y)
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def __le__(self,other):
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return (self.x*self.y<=other.y*other.y)
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def __gt__(self,other):
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return (self.x*self.y>other.x*other.y)
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def __ge__(self,other):
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return (self.x*self.y>=other.x*other.y)
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def __eq__(self,other):
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return (self.x==other.x) and (self.y==other.y)
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def __ne__(self,other):
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return (self.x!=other.x) or (self.y!=other.y)
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def __str__(self):
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return "("+str(self.x)+","+str(self.y)+")"
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class LowPoly2(inkex.Effect):
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def __init__(self):
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inkex.Effect.__init__(self)
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# Clipping a line by a bounding box
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def dot(self, x, y):
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return x[0] * y[0] + x[1] * y[1]
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def intersectLineSegment(self, line, v1, v2):
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s1 = self.dot(line, v1) - line[2]
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s2 = self.dot(line, v2) - line[2]
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if s1 * s2 > 0:
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return (0, 0, False)
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else:
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tmp = self.dot(line, v1) - self.dot(line, v2)
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if tmp == 0:
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return (0, 0, False)
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u = (line[2] - self.dot(line, v2)) / tmp
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v = 1 - u
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return (u * v1[0] + v * v2[0], u * v1[1] + v * v2[1], True)
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def clipEdge(self, vertices, lines, edge, bbox):
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# bounding box corners
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bbc = []
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bbc.append((bbox[0], bbox[2]))
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bbc.append((bbox[1], bbox[2]))
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bbc.append((bbox[1], bbox[3]))
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bbc.append((bbox[0], bbox[3]))
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# record intersections of the line with bounding box edges
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line = (lines[edge[0]])
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interpoints = []
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for i in range(4):
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p = self.intersectLineSegment(line, bbc[i], bbc[(i + 1) % 4])
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if (p[2]):
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interpoints.append(p)
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# if the edge has no intersection, return empty intersection
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if (len(interpoints) < 2):
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return []
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if (len(interpoints) > 2): #h appens when the edge crosses the corner of the box
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interpoints = list(set(interpoints)) # remove doubles
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# points of the edge
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v1 = vertices[edge[1]]
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interpoints.append((v1[0], v1[1], False))
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v2 = vertices[edge[2]]
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interpoints.append((v2[0], v2[1], False))
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# sorting the points in the widest range to get them in order on the line
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minx = interpoints[0][0]
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maxx = interpoints[0][0]
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miny = interpoints[0][1]
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maxy = interpoints[0][1]
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for point in interpoints:
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minx = min(point[0], minx)
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maxx = max(point[0], maxx)
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miny = min(point[1], miny)
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maxy = max(point[1], maxy)
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if (maxx - minx) > (maxy - miny):
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interpoints.sort()
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else:
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interpoints.sort(key=lambda pt: pt[1])
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start = []
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inside = False #true when the part of the line studied is in the clip box
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startWrite = False #true when the part of the line is in the edge segment
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for point in interpoints:
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if point[2]: #The point is a bounding box intersection
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if inside:
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if startWrite:
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return [[start[0], start[1]], [point[0], point[1]]]
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else:
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return []
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else:
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if startWrite:
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start = point
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inside = not inside
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else: # The point is a segment endpoint
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if startWrite:
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if inside:
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# a vertex ends the line inside the bounding box
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return [[start[0], start[1]], [point[0], point[1]]]
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else:
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return []
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else:
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if inside:
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start = point
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startWrite = not startWrite
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# Transformation helpers
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def invertTransform(self, mat):
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det = mat[0][0] * mat[1][1] - mat[0][1] * mat[1][0]
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if det != 0: #det is 0 only in case of 0 scaling
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# invert the rotation/scaling part
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a11 = mat[1][1] / det
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a12 = -mat[0][1] / det
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a21 = -mat[1][0] / det
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a22 = mat[0][0] / det
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# invert the translational part
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a13 = -(a11 * mat[0][2] + a12 * mat[1][2])
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a23 = -(a21 * mat[0][2] + a22 * mat[1][2])
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return [[a11, a12, a13], [a21, a22, a23]]
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else:
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return [[0, 0, -mat[0][2]], [0, 0, -mat[1][2]]]
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def getGlobalTransform(self, node):
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parent = node.getparent()
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myTrans = Transform(node.get('transform')).matrix
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if myTrans:
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if parent is not None:
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parentTrans = self.getGlobalTransform(parent)
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if parentTrans:
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return Transform(parentTrans) * Transform(myTrans)
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else:
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return myTrans
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else:
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if parent is not None:
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return self.getGlobalTransform(parent)
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else:
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return None
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def checkImagePath(self, node):
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"""Embed the data of the selected Image Tag element"""
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xlink = node.get('xlink:href')
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if xlink and xlink[:5] == 'data:':
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# No need, data alread embedded
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return
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url = urllib.urlparse(xlink)
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href = urllib.url2pathname(url.path)
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# Primary location always the filename itself.
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path = self.absolute_href(href or '')
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# Backup directory where we can find the image
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if not os.path.isfile(path):
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path = node.get('sodipodi:absref', path)
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if not os.path.isfile(path):
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inkex.errormsg('File not found "{}". Unable to embed image.').format(path)
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return
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if (os.path.isfile(path)):
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return path
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def effect(self):
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# Check that elements have been selected
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if len(self.options.ids) == 0:
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inkex.errormsg("Please select objects!")
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return
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# Drawing styles
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linestyle = {
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'stroke': '#000000',
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'stroke-width': str(self.svg.unittouu('1px')),
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'fill': 'none'
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}
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facestyle = {
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'stroke': '#000000',
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'stroke-width':'0px',# str(self.svg.unittouu('1px')),
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'fill': 'none'
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}
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# Handle the transformation of the current group
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parentGroup = (self.svg.selected[self.options.ids[0]]).getparent()
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svg = self.document.getroot()
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image_element = svg.find('.//{http://www.w3.org/2000/svg}image')
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if image_element is None:
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inkex.utils.debug("No image found")
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exit(1)
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self.path = self.checkImagePath(image_element) # This also ensures the file exists
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if self.path is None: # check if image is embedded or linked
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image_string = image_element.get('{http://www.w3.org/1999/xlink}href')
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# find comma position
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i = 0
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while i < 40:
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if image_string[i] == ',':
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break
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i = i + 1
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img = Image.open(BytesIO(base64.b64decode(image_string[i + 1:len(image_string)])))
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else:
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img = Image.open(self.path)
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extrinsic_image_width=float(image_element.get('width'))
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extrinsic_image_height=float(image_element.get('height'))
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(width, height) = img.size
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trans = self.getGlobalTransform(parentGroup)
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invtrans = None
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if trans:
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invtrans = self.invertTransform(trans)
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# Recovery of the selected objects
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pts = []
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nodes = []
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seeds = []
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for id in self.options.ids:
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node = self.svg.selected[id]
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nodes.append(node)
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if(node.tag=="{http://www.w3.org/2000/svg}path"):#If it is path
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# Get vertex coordinates of path
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points = CubicSuperPath(node.get('d'))
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for p in points[0]:
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pt=[p[1][0],p[1][1]]
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if trans:
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Transform(trans).apply_to_point(pt)
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pts.append(Point(pt[0], pt[1]))
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seeds.append(Point(p[1][0], p[1][1]))
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else: # For other shapes
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bbox = node.bounding_box()
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if bbox:
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cx = 0.5 * (bbox.left + bbox.top)
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cy = 0.5 * (bbox.top + bbox.bottom)
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pt = [cx, cy]
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if trans:
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Transform(trans).apply_to_point(pt)
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pts.append(Point(pt[0], pt[1]))
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seeds.append(Point(cx, cy))
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pts.sort()
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seeds.sort()
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# In Creation of groups to store the result
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# Delaunay
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groupDelaunay = etree.SubElement(parentGroup, inkex.addNS('g', 'svg'))
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groupDelaunay.set(inkex.addNS('label', 'inkscape'), 'Delaunay')
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scale_x=float(extrinsic_image_width)/float(width)
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scale_y=float(extrinsic_image_height)/float(height)
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# Voronoi diagram generation
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triangles = voronoi.computeDelaunayTriangulation(seeds)
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for triangle in triangles:
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p1 = seeds[triangle[0]]
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p2 = seeds[triangle[1]]
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p3 = seeds[triangle[2]]
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cmds = [['M', [p1.x, p1.y]],
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['L', [p2.x, p2.y]],
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['L', [p3.x, p3.y]],
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['Z', []]]
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path = etree.Element(inkex.addNS('path', 'svg'))
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path.set('d', str(Path(cmds)))
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middleX=(p1.x+p2.x+p3.x)/3.0
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middleY=(p1.y+p2.y+p3.y)/3.0
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if width>middleX and height>middleY and middleX>=0 and middleY>=0:
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pixelColor = img.getpixel((middleX,middleY))
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facestyle["fill"]=str(inkex.Color((pixelColor[0], pixelColor[1], pixelColor[2])))
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else:
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facestyle["fill"]="black"
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path.set('style', str(inkex.Style(facestyle)))
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groupDelaunay.append(path)
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if __name__ == '__main__':
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LowPoly2().run()
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