100 lines
4.2 KiB
Python
100 lines
4.2 KiB
Python
|
import math
|
||
|
|
import re
|
||
|
|
import inkex
|
||
|
|
from inkex import bezier
|
||
|
|
from inkex.paths import Path, CubicSuperPath
|
||
|
|
|
||
|
|
class BarrelDistorsion(inkex.EffectExtension):
|
||
|
|
|
||
|
|
def add_arguments(self, pars):
|
||
|
|
pars.add_argument("--lambda_coef", type=float, default=-5.0, help="command line help")
|
||
|
|
|
||
|
|
def distort_coordinates(self, x, y):
|
||
|
|
"""Method applies barrel distorsion to given points with distorsion center in center of image, selected to
|
||
|
|
|
||
|
|
Args:
|
||
|
|
x (float): X coordinate of given point
|
||
|
|
y (float): Y coordinate of given point
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
tuple(float, float): Tuple with X,Y distorted coordinates of given point
|
||
|
|
"""
|
||
|
|
x_u = (x - self.x_c) / (self.width + self.height)
|
||
|
|
y_u = (y - self.y_c) / (self.width + self.height)
|
||
|
|
x_d = x_u / 2 / (self.q * y_u**2 + x_u**2 * self.q) * (1 - math.sqrt(1 - 4 * self.q * y_u**2 - 4 * x_u**2 * self.q))
|
||
|
|
y_d = y_u / 2 / (self.q * y_u**2 + x_u**2 * self.q) * (1 - math.sqrt(1 - 4 * self.q * y_u**2 - 4 * x_u**2 * self.q))
|
||
|
|
x_d *= self.width + self.height
|
||
|
|
y_d *= self.width + self.height
|
||
|
|
x_d += self.x_c
|
||
|
|
y_d += self.y_c
|
||
|
|
return x_d, y_d
|
||
|
|
|
||
|
|
def split_into_nodes(self, nodes_number=1000):
|
||
|
|
for id, node in self.svg.selected.items():
|
||
|
|
if node.tag == inkex.addNS('path', 'svg'):
|
||
|
|
p = CubicSuperPath(node.get('d'))
|
||
|
|
new = []
|
||
|
|
for sub in p:
|
||
|
|
new.append([sub[0][:]])
|
||
|
|
i = 1
|
||
|
|
while i <= len(sub) - 1:
|
||
|
|
length = bezier.cspseglength(
|
||
|
|
new[-1][-1], sub[i])
|
||
|
|
|
||
|
|
splits = nodes_number
|
||
|
|
for s in range(int(splits), 1, -1):
|
||
|
|
new[-1][-1], next, sub[
|
||
|
|
i] = bezier.cspbezsplitatlength(
|
||
|
|
new[-1][-1], sub[i], 1.0 / s)
|
||
|
|
new[-1].append(next[:])
|
||
|
|
new[-1].append(sub[i])
|
||
|
|
i += 1
|
||
|
|
node.set('d', str(CubicSuperPath(new)))
|
||
|
|
|
||
|
|
def effect(self):
|
||
|
|
if re.match(r'g\d+',
|
||
|
|
list(self.svg.selected.items())[0][0]) is not None:
|
||
|
|
raise SystemExit(
|
||
|
|
"You are trying to distort group of objects.\n This extension works only with path objects due to Inkscape API restrictions.\n Ungroup your objects and try again."
|
||
|
|
)
|
||
|
|
self.split_into_nodes()
|
||
|
|
self.q = self.options.lambda_coef
|
||
|
|
if self.q == 0.0:
|
||
|
|
inkex.errormsg("Invalid lambda coefficient. May not be exactly zero.")
|
||
|
|
return
|
||
|
|
nodes = []
|
||
|
|
for id, node in self.svg.selected.items():
|
||
|
|
if node.tag == inkex.addNS('path', 'svg'):
|
||
|
|
path = Path(node.get('d')).to_arrays()
|
||
|
|
nodes += path
|
||
|
|
nodes_filtered = [x for x in nodes if x[0] != 'Z']
|
||
|
|
x_coordinates = [x[-1][-2] for x in nodes_filtered]
|
||
|
|
y_coordinates = [y[-1][-1] for y in nodes_filtered]
|
||
|
|
self.width = max(x_coordinates) - min(x_coordinates)
|
||
|
|
self.height = max(y_coordinates) - min(y_coordinates)
|
||
|
|
self.x_c = sum(x_coordinates) / len(x_coordinates)
|
||
|
|
self.y_c = sum(y_coordinates) / len(y_coordinates)
|
||
|
|
for id, node in self.svg.selected.items():
|
||
|
|
if node.tag == inkex.addNS('path', 'svg'):
|
||
|
|
path = Path(node.get('d')).to_arrays()
|
||
|
|
distorted = []
|
||
|
|
first = True
|
||
|
|
for cmd, params in path:
|
||
|
|
if cmd != 'Z':
|
||
|
|
if first == True:
|
||
|
|
x = params[-2]
|
||
|
|
y = params[-1]
|
||
|
|
distorted.append(
|
||
|
|
['M',
|
||
|
|
list(self.distort_coordinates(x, y))])
|
||
|
|
first = False
|
||
|
|
else:
|
||
|
|
x = params[-2]
|
||
|
|
y = params[-1]
|
||
|
|
distorted.append(
|
||
|
|
['L', self.distort_coordinates(x, y)])
|
||
|
|
node.set('d', str(Path(distorted)))
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
BarrelDistorsion().run()
|