Adding upstream version 1.0.2.upstream/1.0.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 206 insertions, 0 deletions

diff --git a/share/extensions/param_curves.py b/share/extensions/param_curves.py
new file mode 100755
index 0000000..14a2da0
--- /dev/null
+++ b/share/extensions/param_curves.py
@@ -0,0 +1,206 @@
+#!/usr/bin/env python
+# coding=utf-8
+#
+# Copyright (C) 2009 Michel Chatelain.
+#               2007 Tavmjong Bah, tavmjong@free.fr
+#               2006 Georg Wiora, xorx@quarkbox.de
+#               2006 Johan Engelen, johan@shouraizou.nl
+#               2005 Aaron Spike, aaron@ekips.org
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# Changes:
+#  * This program is derived by Michel Chatelain from funcplot.py.
+#    His changes are in the Public Domain.
+#  * Michel Chatelain, 17-18 janvier 2009, a partir de funcplot.py
+#  * 20 janvier 2009 : adaptation a la version 0.46 a partir de la nouvelle version de funcplot.py
+#
+"""
+Parametric Curves has no real description, even in the inx file, which is really odd.
+"""
+
+from math import pi, cos, sin, tan
+
+import inkex
+
+def maths_eval(user_function):
+    """Try and make the eval safer"""
+    func = 'lambda t: ' + (user_function.strip('"') or 't')
+    return eval( # pylint: disable=eval-used
+        func,
+        {
+            'pi': pi, 'sin': sin, 'cos': cos, 'tan': tan,
+        }, {})
+
+def drawfunction(t_start, t_end, xleft, xright, ybottom, ytop, samples, width, height, left, bottom,
+                 fx="cos(3*t)", fy="sin(5*t)", times2pi=False, isoscale=True, drawaxis=True):
+    if times2pi:
+        t_start *= 2 * pi
+        t_end *= 2 * pi
+
+    # coords and scales based on the source rect
+    scalex = width / (xright - xleft)
+    xoff = left
+    coordx = lambda x: (x - xleft) * scalex + xoff  # convert x-value to coordinate
+    scaley = height / (ytop - ybottom)
+    yoff = bottom
+    coordy = lambda y: (ybottom - y) * scaley + yoff  # convert y-value to coordinate
+
+    # Check for isotropic scaling and use smaller of the two scales, correct ranges
+    if isoscale:
+        if scaley < scalex:
+            # compute zero location
+            xzero = coordx(0)
+            # set scale
+            scalex = scaley
+            # correct x-offset
+            xleft = (left - xzero) / scalex
+            xright = (left + width - xzero) / scalex
+        else:
+            # compute zero location
+            yzero = coordy(0)
+            # set scale
+            scaley = scalex
+            # correct x-offset
+            ybottom = (yzero - bottom) / scaley
+            ytop = (bottom + height - yzero) / scaley
+
+    # functions specified by the user
+    f1 = maths_eval(fx)
+    f2 = maths_eval(fy)
+
+    # step is increment of t
+    step = (t_end - t_start) / (samples - 1)
+    third = step / 3.0
+    ds = step * 0.001  # Step used in calculating derivatives
+
+    a = []  # path array
+    # add axis
+    if drawaxis:
+        # check for visibility of x-axis
+        if ybottom <= 0 <= ytop:
+            # xaxis
+            a.append(['M', [left, coordy(0)]])
+            a.append(['l', [width, 0]])
+        # check for visibility of y-axis
+        if xleft <= 0 <= xright:
+            # xaxis
+            a.append(['M', [coordx(0), bottom]])
+            a.append(['l', [0, -height]])
+
+    # initialize functions and derivatives for 0;
+    # they are carried over from one iteration to the next, to avoid extra function calculations.
+    #print("RET: {}".format(f1(1)))
+    x0 = f1(t_start)
+    y0 = f2(t_start)
+
+    # numerical derivatives, using 0.001*step as the small differential
+    t1 = t_start + ds  # Second point AFTER first point (Good for first point)
+    x1 = f1(t1)
+    y1 = f2(t1)
+    dx0 = (x1 - x0) / ds
+    dy0 = (y1 - y0) / ds
+
+    # Start curve
+    a.append(['M', [coordx(x0), coordy(y0)]])  # initial moveto
+    for i in range(int(samples - 1)):
+        t1 = (i + 1) * step + t_start
+        t2 = t1 - ds  # Second point BEFORE first point (Good for last point)
+        x1 = f1(t1)
+        x2 = f1(t2)
+        y1 = f2(t1)
+        y2 = f2(t2)
+
+        # numerical derivatives
+        dx1 = (x1 - x2) / ds
+        dy1 = (y1 - y2) / ds
+
+        # create curve
+        a.append(['C',
+                  [coordx(x0 + (dx0 * third)), coordy(y0 + (dy0 * third)),
+                   coordx(x1 - (dx1 * third)), coordy(y1 - (dy1 * third)),
+                   coordx(x1), coordy(y1)]
+                  ])
+        t0 = t1  # Next segment's start is this segments end
+        x0 = x1
+        y0 = y1
+        dx0 = dx1  # Assume the functions are smooth everywhere, so carry over the derivatives too
+        dy0 = dy1
+    return a
+
+
+class ParamCurves(inkex.EffectExtension):
+    def add_arguments(self, pars):
+        pars.add_argument("--t_start", type=float, default=0.0, help="Start t-value")
+        pars.add_argument("--t_end", type=float, default=1.0, help="End t-value")
+        pars.add_argument("--times2pi", type=inkex.Boolean, default=True,
+                          help="Multiply t-range by 2*pi")
+        pars.add_argument("--xleft", type=float, default=-1.0, help="x-value of left")
+        pars.add_argument("--xright", type=float, default=1.0, help="x-value of right")
+        pars.add_argument("--ybottom", type=float, default=-1.0, help="y-value of bottom")
+        pars.add_argument("--ytop", type=float, default=1.0, help="y-value of top")
+        pars.add_argument("-s", "--samples", type=int, default=8, help="Samples")
+        pars.add_argument("--fofx", default="cos(3*t)", help="fx(t) for plotting")
+        pars.add_argument("--fofy", default="sin(5*t)", help="fy(t) for plotting")
+        pars.add_argument("--remove", type=inkex.Boolean, default=True, help="Remove rectangle")
+        pars.add_argument("--isoscale", type=inkex.Boolean, default=True, help="Isotropic scaling")
+        pars.add_argument("--drawaxis", type=inkex.Boolean, default=True)
+        pars.add_argument("--tab", default="sampling")
+
+    def effect(self):
+        for node in self.svg.selected.values():
+            if isinstance(node, inkex.Rectangle):
+                # create new path with basic dimensions of selected rectangle
+                newpath = inkex.PathElement()
+                x = float(node.get('x'))
+                y = float(node.get('y'))
+                width = float(node.get('width'))
+                height = float(node.get('height'))
+
+                # copy attributes of rect
+                newpath.style = node.style
+                newpath.transform = node.transform
+
+                # top and bottom were exchanged
+                newpath.path = \
+                        drawfunction(self.options.t_start,
+                                     self.options.t_end,
+                                     self.options.xleft,
+                                     self.options.xright,
+                                     self.options.ybottom,
+                                     self.options.ytop,
+                                     self.options.samples,
+                                     width, height, x, y + height,
+                                     self.options.fofx,
+                                     self.options.fofy,
+                                     self.options.times2pi,
+                                     self.options.isoscale,
+                                     self.options.drawaxis)
+                newpath.set('title', self.options.fofx + " " + self.options.fofy)
+
+                # newpath.set('desc', '!func;' + self.options.fofx + ';' + self.options.fofy + ';'
+                #                                      + `self.options.t_start` + ';'
+                #                                      + `self.options.t_end` + ';'
+                #                                      + `self.options.samples`)
+
+                # add path into SVG structure
+                node.getparent().append(newpath)
+                # option whether to remove the rectangle or not.
+                if self.options.remove:
+                    node.getparent().remove(node)
+
+
+if __name__ == '__main__':
+    ParamCurves().run()