320 lines
15 KiB
Python
320 lines
15 KiB
Python
#!/usr/bin/env python3
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'''
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Created by Danylo Horbatenko 2018, dnkxyz@gmail.com
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Copyright (C) 2018 George Fomitchev, gf@endurancerobots.com
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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'''
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#Version control: last edited by 01.03.2018 8:20
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import os
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import tempfile
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import shutil
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import subprocess
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import math
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import inkex
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import sys
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import png
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from lxml import etree
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from inkex.paths import Path
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def saw(x):
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#The function returns a symmetric triangle wave with period 4 and varying between -1 and 1
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x = math.fmod(x, 4.0)
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x = math.fabs(x)
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if x > 2.0:
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y = 3 - x
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else:
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y = x - 1
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return y
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def square(x):
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#The function returns a square wave with period 4 and varying between -1 and 1
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x = math.fmod(x, 4.0)
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if 1.0 < x < 3.0:
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y = 1.0
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else:
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y = -1.0
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return y
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class LineShading(inkex.EffectExtension):
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def add_arguments(self, pars):
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pars.add_argument('--palette', help='Choose the colors...')
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pars.add_argument("--waveform", help="Select the shape of the curve")
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pars.add_argument("--num_lines", type=int, help="Number of lines")
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pars.add_argument("--min_period", type=float, help="Minimum period (corresponds to black pixels)")
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pars.add_argument("--max_period", type=float, help="Maximum period (corresponds to white pixels)")
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pars.add_argument("--min_amplitude", type=float, help="Minimum amplitude (corresponds to white pixels)")
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pars.add_argument("--max_amplitude", type=float, help="Maximum amplitude (corresponds to black pixels)")
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pars.add_argument("--gamma", type=float, help="Maximum amplitude (corresponds to black pixels)")
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pars.add_argument("--line_width", type=float, help="Line width")
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pars.add_argument("--units", help="Units for line thickness")
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pars.add_argument("--remove", type=inkex.Boolean, help="If True, source image is removed")
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pars.add_argument("--active-tab", help="The selected UI-tab when OK was pressed")
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def drawfunction(self, image_w, image_h, file):
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reader = png.Reader(file)
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w, h, pixels, metadata = reader.read_flat()
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matrice = [[1.0 for i in range(w)]for j in range(h)]
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if metadata['alpha']:
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n = 4
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else:
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n = 3
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#RGB convert to grayscale 0.21R + 0.72G + 0.07B
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for y in range(h):
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for x in range(w):
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pixel_pos = (x + y * w)*n
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p = 1.0 - (pixels[pixel_pos]*0.21 + pixels[(pixel_pos+1)]*0.72 + pixels[(pixel_pos+2)]*0.07)/255.0
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matrice[y][x] = math.pow(p, 1.0/self.options.gamma)
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points = []
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step_y = image_h/h
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step_x = image_w/(w-1)
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min_amplitude = self.options.min_amplitude*step_y/2
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max_amplitude = self.options.max_amplitude*step_y/2
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min_period = self.options.min_period*step_y
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max_period = self.options.max_period*step_y
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min_frequency = 1.0/max_period
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max_frequency = 1.0/min_period
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#Sinusoidal wave (optimized)
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if self.options.waveform == 'sin':
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for y in range(h):
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pi = math.pi
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phase = 0.0
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coord_x = 0.0
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amplitude = 0.0
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n_step = 0
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x0 = 0.0
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y0 = math.sin(phase)*(min_amplitude + (max_amplitude - min_amplitude)*matrice[y][x]) + (y+0.5)*step_y
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points.append(['M',[x0, y0]])
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for x in range(w):
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period = min_period + (max_period - min_period)*(1-matrice[y][x])
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#period = 1.0/(min_frequency + (max_frequency - min_frequency)*(matrice[y][x]))
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d_phase = 2.0*pi/period*step_x
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#calculate y
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if phase > 2.0*pi:
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if n_step > 0:
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x3 = coord_x
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y3 = -amplitude/n_step + (y+0.5)*step_y
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x2 = x3 - (x3-x0)*0.32
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y2 = y3
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x1 = x0 + (x3-x0)*0.34
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y1 = y0
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x0 = x3
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y0 = y3
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points.append(['C',[x1, y1, x2, y2, x3, y3]])
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n_step = 0
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amplitude = 0
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elif phase < pi < (phase + d_phase):
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if n_step > 0:
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x3 = coord_x
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y3 = amplitude/n_step + (y+0.5)*step_y
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x2 = x3 - (x3-x0)*0.34
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y2 = y3
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x1 = x0 + (x3-x0)*0.32
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y1 = y0
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x0 = x3
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y0 = y3
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points.append(['C',[x1, y1, x2, y2, x3, y3]])
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n_step = 0
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amplitude = 0
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phase = math.fmod(phase, 2.0*pi)
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#calculate x
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if phase < 0.5*pi < (phase + d_phase):
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coord_x = (x - (phase - 0.5*pi)/d_phase)*step_x
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elif phase < 1.5*pi < (phase + d_phase):
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coord_x = (x - (phase - 1.5*pi)/d_phase)*step_x
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phase += d_phase
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amplitude += (min_amplitude + (max_amplitude - min_amplitude)*matrice[y][x])
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n_step += 1
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#add last point
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if n_step > 0:
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phase = math.fmod(phase, 2.0*pi)
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if (0 < phase < 0.5*pi) or (pi < phase < 1.5*pi):
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x3 = (w-1)*step_x
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y3 = amplitude*math.sin(phase)/n_step + (y+0.5)*step_y
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x2 = x3
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y2 = y3
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x1 = x0 + (x3-x0)*0.33
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y1 = y0
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points.append(['C',[x1, y1, x2, y2, x3, y3]])
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else:
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if coord_x > (w-1)*step_x:
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coord_x = (w-1)*step_x
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x3 = coord_x
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y3 = math.copysign( amplitude , math.sin(phase))/n_step + (y+0.5)*step_y
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x2 = x3 - (x3-x0)*0.32
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y2 = y3
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x1 = x0 + (x3-x0)*0.34
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y1 = y0
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points.append(['C',[x1, y1, x2, y2, x3, y3]])
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if coord_x < (w-1)*step_x:
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x0 = x3
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y0 = y3
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x3 = (w-1)*step_x
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y3 = amplitude*math.sin(phase)/n_step + (y+0.5)*step_y
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x2 = x3
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y2 = y3
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x1 = x0 + (x3-x0)*0.33
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y1 = y0
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points.append(['C',[x1, y1, x2, y2, x3, y3]])
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#Sinusoidal wave (Brute-force)
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elif self.options.waveform == 'sin_b':
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pi2 = math.pi*2.0
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for y in range(h):
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phase = - pi2/4.0
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for x in range(w):
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period = min_period + (max_period - min_period)*(1-matrice[y][x])
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amplitude = min_amplitude + (max_amplitude - min_amplitude)*matrice[y][x]
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phase += pi2*step_x/period
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phase = math.fmod(phase, pi2)
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if x == 0:
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points.append(['M',[x*step_x, amplitude*math.sin(phase) + (y+0.5)*step_y]])
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else:
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points.append(['L',[x*step_x, amplitude*math.sin(phase) + (y+0.5)*step_y]])
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#Saw wave
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elif self.options.waveform == 'saw':
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for y in range(h):
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phase = 0.0
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coord_x = 0.0
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amplitude = 0.0
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n_step = 0.0
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for x in range(w):
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period = min_period + (max_period - min_period)*(1-matrice[y][x])
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#period = 1.0/(min_frequency + (max_frequency - min_frequency)*(matrice[y][x]))
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d_phase = 4.0/period*step_x
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if phase > 4.0:
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coord_x = (x - (phase - 4.0)/d_phase)*step_x
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elif phase < 2.0 < (phase + d_phase):
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coord_x = (x - (phase - 2.0)/d_phase)*step_x
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phase = math.fmod(phase, 4.0)
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if (phase < 1.0 < (phase + d_phase)) or (phase < 3.0 < (phase + d_phase)):
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if n_step > 0:
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if coord_x == 0.0:
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points.append(['M',[coord_x, amplitude*square(phase - 1.0)/n_step + (y+0.5)*step_y]])
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else:
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points.append(['L',[coord_x, amplitude*square(phase - 1.0)/n_step + (y+0.5)*step_y]])
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n_step = 0
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amplitude = 0
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phase += d_phase
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n_step += 1.0
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amplitude += (min_amplitude + (max_amplitude - min_amplitude)*matrice[y][x])
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if n_step > 0:
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points.append(['L',[(w-1)*step_x, amplitude*saw(phase - 1.0)/n_step + (y+0.5)*step_y]])
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#Square wave
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else:
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for y in range(h):
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phase = 0.0
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coord_x = 0.0
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amplitude = 0.0
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n_step = 0
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for x in range(w):
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period = min_period + (max_period - min_period)*(1-matrice[y][x])
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#period = 1.0/(min_frequency + (max_frequency - min_frequency)*(matrice[y][x]))
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d_phase = 4.0/period*step_x
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if phase > 4.0:
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coord_x = (x - (phase - 4.0)/d_phase)*step_x
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elif phase < 2.0 < (phase + d_phase):
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coord_x = (x - (phase - 2.0)/d_phase)*step_x
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phase = math.fmod(phase, 4.0)
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if phase < 1.0 < (phase + d_phase):
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if n_step > 0:
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if coord_x == 0.0:
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points.append(['M',[coord_x, amplitude/n_step + (y+0.5)*step_y]])
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else:
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points.append(['L',[coord_x, -amplitude/n_step + (y+0.5)*step_y]])
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points.append(['L',[coord_x, amplitude/n_step + (y+0.5)*step_y]])
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n_step = 0
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amplitude = 0
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elif phase < 3.0 < (phase + d_phase):
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if n_step > 0:
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if coord_x == 0.0:
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points.append(['M',[coord_x, -amplitude/n_step + (y+0.5)*step_y]])
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else:
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points.append(['L',[coord_x, amplitude/n_step + (y+0.5)*step_y]])
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points.append(['L',[coord_x, -amplitude/n_step + (y+0.5)*step_y]])
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n_step = 0
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amplitude = 0
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phase += d_phase
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n_step += 1
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amplitude += (min_amplitude + (max_amplitude - min_amplitude)*matrice[y][x])
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if n_step > 0:
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if 3.0 > phase > 1.0:
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points.append(['L',[(w-1)*step_x, amplitude/n_step + (y+0.5)*step_y]])
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else:
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points.append(['L',[(w-1)*step_x, -amplitude/n_step + (y+0.5)*step_y]])
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return points
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def draw_path(self, node, file):
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newpath = etree.Element(inkex.addNS('path','svg'))
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line_width = self.options.line_width
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units = self.options.units
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s = {'stroke': '#000000', 'fill': 'none', 'stroke-linejoin': 'round', 'stroke-linecap': 'round', 'stroke-width': str(self.svg.unittouu(str(line_width) + units))}
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newpath.set('style', str(inkex.Style(s)))
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x = node.get('x')
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y = node.get('y')
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t = 'translate('+ x +','+ y +')'
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newpath.set('transform', t)
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image_w = float(node.get('width'))
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image_h = float(node.get('height'))
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newpath.set('d', str(Path(self.drawfunction(image_w, image_h, file))))
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newpath.set('title', 'Line_Shading')
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node.getparent().append(newpath)
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newpath.set('x', x)
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def export_png(self, node, file):
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image_w = float(node.get('width'))
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image_h = float(node.get('height'))
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min_period = self.options.min_period
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max_period = self.options.min_period
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poinnt_per_min_period = 8.0
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current_file = self.options.input_file
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h_png = str(self.options.num_lines)
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if min_period < max_period:
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w_png = str(round(poinnt_per_min_period*image_w*float(h_png)/min_period/image_h))
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else:
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w_png = str(round(poinnt_per_min_period*image_w*float(h_png)/max_period/image_h))
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id = node.get('id')
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cmd = "inkscape " + current_file + " --export-type=\"png\" --export-filename=" + file + " --actions=\"export-width:"+w_png+";export-height:"+h_png+";export-background:rgb(255,255,255);export-background-opacity:255;export-id:"+id+"\""
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#inkex.errormsg(cmd)
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proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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#inkex.utils.debug(cmd)
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#inkex.utils.debug(proc.communicate())
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#sys.exit(0)
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#return_code = proc.wait()
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#sys.exit(0)
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f = proc.stdout
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err = proc.stderr
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f.close()
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err.close()
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proc.wait()
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#inkex.errormsg(proc.stdout.read())
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def effect(self):
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image_selected_flag = False
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for id, node in self.svg.selected.items():
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if node.tag == inkex.addNS('image','svg'):
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image_selected_flag = True
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tmp_dir = tempfile.mkdtemp()
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png_temp_file = os.path.join(tmp_dir, "LineShading.png")
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self.export_png(node, png_temp_file)
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self.draw_path(node, png_temp_file)
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shutil.rmtree(tmp_dir)
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if self.options.remove:
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node.delete()
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return
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if not image_selected_flag:
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inkex.errormsg("Please select an image")
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if __name__ == '__main__':
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LineShading().run() |