269 lines
8.9 KiB
Python
269 lines
8.9 KiB
Python
#!/usr/bin/env python3
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"""
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Copyright (C) 2018 Rich Pang, rpang.contact@gmail.com.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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"""
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from __future__ import division
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from copy import deepcopy
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import inkex
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from inkex.paths import Path, CubicSuperPath
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from inkex.transforms import Transform
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import numpy as np
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from lxml import etree
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# rename common numpy operations
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abs = np.abs
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sin = np.sin
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cos = np.cos
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tan = np.tan
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exp = np.exp
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log = np.log
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log10 = np.log10
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pi = np.pi
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__version__ = '0.1'
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def split(l, sizes):
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"""Split a list into sublists of specific sizes."""
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if not sum(sizes) == len(l):
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raise ValueError('sum(sizes) must equal len(l)')
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sub_lists = []
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ctr = 0
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for size in sizes:
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sub_lists.append(l[ctr:ctr+size])
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ctr += size
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return sub_lists
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class Travel(inkex.Effect):
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def __init__(self):
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# initialize parent class
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inkex.Effect.__init__(self)
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# get params entered by user
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self.arg_parser.add_argument('--x_scale', type=float, default=0, help='x scale')
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self.arg_parser.add_argument('--y_scale', type=float, default=0, help='y scale')
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self.arg_parser.add_argument('--t_start', type=float, default=0, help='t start')
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self.arg_parser.add_argument('--t_end', type=float, default=1, help='t_end')
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self.arg_parser.add_argument('--n_steps', type=int, default=10, help='num steps')
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self.arg_parser.add_argument('--fps', type=float, default=0, help='fps')
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self.arg_parser.add_argument('--dt', type=float, default=0, help='dt')
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self.arg_parser.add_argument('--x_eqn', default='', help='x')
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self.arg_parser.add_argument('--y_eqn', default='', help='y')
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self.arg_parser.add_argument('--x_size_eqn', default='', help='x size')
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self.arg_parser.add_argument('--y_size_eqn', default='', help='y size')
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self.arg_parser.add_argument('--theta_eqn', default='', help='theta')
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self.arg_parser.add_argument('--active-tab', default='options', help='active tab')
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def effect(self):
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x_scale = self.options.x_scale
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y_scale = self.options.y_scale
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t_start = self.options.t_start
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t_end = self.options.t_end
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n_steps = self.options.n_steps
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fps = self.options.fps
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dt = self.options.dt
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x_eqn = self.options.x_eqn
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y_eqn = self.options.y_eqn
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x_size_eqn = self.options.x_size_eqn
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y_size_eqn = self.options.y_size_eqn
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theta_eqn = self.options.theta_eqn
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# get doc root
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svg = self.document.getroot()
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doc_w = self.svg.unittouu(svg.get('width'))
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doc_h = self.svg.unittouu(svg.get('height'))
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# get selected items and validate
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selected = svg.selection.rendering_order()
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if not selected:
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inkex.errormsg('Exactly two objects must be selected: a rect and a template. See "help" for details.')
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return
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elif len(selected) != 2:
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inkex.errormsg('Exactly two objects must be selected: a rect and a template. See "help" for details.')
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return
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# rect
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rect = self.svg.selected[self.options.ids[0]]
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if not rect.tag.endswith('rect'):
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inkex.errormsg('Bottom object must be rect. See "help" for usage.')
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return
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# object
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obj = self.svg.selected[self.options.ids[1]]
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if not (obj.tag.endswith('path') or obj.tag.endswith('g')):
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inkex.errormsg('Template object must be path or group of paths. See "help" for usage.')
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return
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if obj.tag.endswith('g'):
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children = obj.getchildren()
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if not all([ch.tag.endswith('path') for ch in children]):
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msg = 'All elements of group must be paths, but they are: '
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msg += ', '.join(['{}'.format(ch) for ch in children])
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inkex.errormsg(msg)
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return
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objs = children
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is_group = True
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else:
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objs = [obj]
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is_group = False
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# get rect params
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w = float(rect.get('width'))
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h = float(rect.get('height'))
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x_rect = float(rect.get('x'))
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y_rect = float(rect.get('y'))
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# lower left corner
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x_0 = x_rect
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y_0 = y_rect + h
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# get object path(s)
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obj_ps = [Path(obj_.get('d')) for obj_ in objs]
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n_segs = [len(obj_p_) for obj_p_ in obj_ps]
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obj_p = sum(obj_ps, [])
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# compute travel parameters
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if not n_steps:
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# compute dt
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if dt == 0:
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dt = 1./fps
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ts = np.arange(t_start, t_end, dt)
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else:
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ts = np.linspace(t_start, t_end, n_steps)
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# compute xs, ys, stretches, and rotations in arbitrary coordinates
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xs = np.nan * np.zeros(len(ts))
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ys = np.nan * np.zeros(len(ts))
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x_sizes = np.nan * np.zeros(len(ts))
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y_sizes = np.nan * np.zeros(len(ts))
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thetas = np.nan * np.zeros(len(ts))
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for ctr, t in enumerate(ts):
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xs[ctr] = eval(x_eqn)
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ys[ctr] = eval(y_eqn)
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x_sizes[ctr] = eval(x_size_eqn)
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y_sizes[ctr] = eval(y_size_eqn)
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thetas[ctr] = eval(theta_eqn) * pi / 180
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# ensure no Infs
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if np.any(np.isinf(xs)):
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raise Exception('Inf detected in x(t), please remove.')
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return
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if np.any(np.isinf(ys)):
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raise Exception('Inf detected in y(t), please remove.')
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return
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if np.any(np.isinf(x_sizes)):
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raise Exception('Inf detected in x_size(t), please remove.')
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return
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if np.any(np.isinf(y_sizes)):
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raise Exception('Inf detected in y_size(t), please remove.')
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return
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if np.any(np.isinf(thetas)):
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raise Exception('Inf detected in theta(t), please remove.')
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return
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# convert to screen coordinates
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xs *= (w/x_scale)
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xs += x_0
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ys *= (-h/y_scale) # neg sign to invert y for inkscape screen
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ys += y_0
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# get obj center
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b_box = Path(obj_p).bounding_box()
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c_x = 0.5 * (b_box.left + b_box.right)
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c_y = 0.5 * (b_box.top + b_box.bottom)
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# get rotation anchor
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if any([k.endswith('transform-center-x') for k in obj.keys()]):
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k_r_x = [k for k in obj.keys() if k.endswith('transform-center-x')][0]
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k_r_y = [k for k in obj.keys() if k.endswith('transform-center-y')][0]
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r_x = c_x + float(obj.get(k_r_x))
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r_y = c_y - float(obj.get(k_r_y))
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else:
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r_x, r_y = c_x, c_y
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paths = []
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# compute new paths
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for x, y, x_size, y_size, theta in zip(xs, ys, x_sizes, y_sizes, thetas):
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path = deepcopy(obj_p)
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# move to origin
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path = Path(path).translate(-x_0, -y_0)
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# move rotation anchor accordingly
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r_x_1 = r_x - x_0
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r_y_1 = r_y - y_0
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# scale
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path = Path(path).scale(x_size, y_size)
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# scale rotation anchor accordingly
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r_x_2 = r_x_1 * x_size
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r_y_2 = r_y_1 * y_size
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# move to final location
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path = Path(path).translate(x, y)
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# move rotation anchor accordingly
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r_x_3 = r_x_2 + x
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r_y_3 = r_y_2 + y
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# rotate
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path = Path(path).rotate(-theta, (r_x_3, r_y_3))
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paths.append(path)
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parent = self.svg.get_current_layer()
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group = etree.SubElement(parent, inkex.addNS('g', 'svg'), {})
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for path in paths:
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if is_group:
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group_ = etree.SubElement(group, inkex.addNS('g', 'svg'), {})
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path_components = split(path, n_segs)
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for path_component, child in zip(path_components, children):
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attribs = {
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k: child.get(k) for k in child.keys()
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}
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attribs['d'] = str(Path(path_component))
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child_copy = etree.SubElement(group_, child.tag, attribs)
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else:
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attribs = {
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k: obj.get(k) for k in obj.keys()
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}
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attribs['d'] = str(Path(path))
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obj_copy = etree.SubElement(group, obj.tag, attribs)
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if __name__ == '__main__':
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Travel().run() |