Adding upstream version 1.2.2.upstream/1.2.2upstream

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

1 files changed, 300 insertions, 0 deletions

diff --git a/share/extensions/funcplot.py b/share/extensions/funcplot.py
new file mode 100755
index 0000000..78a712c
--- /dev/null
+++ b/share/extensions/funcplot.py
@@ -0,0 +1,300 @@
+#!/usr/bin/env python
+# coding=utf-8
+#
+# Copyright (C) 2007 Tavmjong Bah, tavmjong@free.fr
+# Copyright (C) 2006 Georg Wiora, xorx@quarkbox.de
+# Copyright (C) 2006 Johan Engelen, johan@shouraizou.nl
+# Copyright (C) 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 a modified version of wavy.py by Aaron Spike.
+#  * 22-Dec-2006: Wiora : Added axis and isotropic scaling
+#  * 21-Jun-2007: Tavmjong: Added polar coordinates
+#
+from math import cos, pi, sin
+
+import inkex
+from inkex import ClipPath, Rectangle
+from inkex.utils import math_eval
+
+from inkex.localization import inkex_gettext as _
+
+
+def drawfunction(
+    xstart,
+    xend,
+    ybottom,
+    ytop,
+    samples,
+    width,
+    height,
+    left,
+    bottom,
+    fx="sin(x)",
+    fpx="cos(x)",
+    fponum=True,
+    times2pi=False,
+    polar=False,
+    isoscale=True,
+    drawaxis=True,
+    endpts=False,
+):
+    if times2pi:
+        xstart = 2 * pi * xstart
+        xend = 2 * pi * xend
+
+    # coords and scales based on the source rect
+    if xstart == xend:
+        inkex.errormsg(
+            _(
+                "x-interval cannot be zero. Please modify 'Start X value' "
+                "or 'End X value'"
+            )
+        )
+        return []
+    scalex = width / (xend - xstart)
+    xoff = left
+    coordx = lambda x: (x - xstart) * scalex + xoff  # convert x-value to coordinate
+    if polar:  # Set scale so that left side of rectangle is -1, right side is +1.
+        # (We can't use xscale for both range and scale.)
+        centerx = left + width / 2.0
+        polar_scalex = width / 2.0
+        coordx = lambda x: x * polar_scalex + centerx  # convert x-value to coordinate
+
+    if ytop == ybottom:
+        inkex.errormsg(
+            _(
+                "y-interval cannot be zero. Please modify 'Y value of rectangle's top' "
+                "or 'Y value of rectangle's bottom'"
+            )
+        )
+        return []
+    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 and not polar:
+        if scaley < scalex:
+            # compute zero location
+            xzero = coordx(0)
+            # set scale
+            scalex = scaley
+            # correct x-offset
+            xstart = (left - xzero) / scalex
+            xend = (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
+
+    f = math_eval(fx)
+    fp = math_eval(fpx)
+    if f is None or (fp is None and not (fponum)):
+        raise inkex.AbortExtension(_("Invalid function specification"))
+
+    # step is the distance between nodes on x
+    step = (xend - xstart) / (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 xstart <= 0 <= xend:
+            # xaxis
+            a.append(["M", [coordx(0), bottom]])
+            a.append(["l", [0, -height]])
+
+    # initialize function and derivative for 0;
+    # they are carried over from one iteration to the next, to avoid extra function calculations.
+    x0 = xstart
+    y0 = f(xstart)
+    if polar:
+        xp0 = y0 * cos(x0)
+        yp0 = y0 * sin(x0)
+        x0 = xp0
+        y0 = yp0
+    if (
+        fponum or polar
+    ):  # numerical derivative, using 0.001*step as the small differential
+        x1 = xstart + ds  # Second point AFTER first point (Good for first point)
+        y1 = f(x1)
+        if polar:
+            xp1 = y1 * cos(x1)
+            yp1 = y1 * sin(x1)
+            x1 = xp1
+            y1 = yp1
+        dx0 = (x1 - x0) / ds
+        dy0 = (y1 - y0) / ds
+    else:  # derivative given by the user
+        dx0 = 1  # Only works for rectangular coordinates
+        dy0 = fp(xstart)
+
+    # Start curve
+    if endpts:
+        a.append(["M", [left, coordy(0)]])
+        a.append(["L", [coordx(x0), coordy(y0)]])
+    else:
+        a.append(["M", [coordx(x0), coordy(y0)]])  # initial moveto
+
+    for i in range(int(samples - 1)):
+        x1 = (i + 1) * step + xstart
+        x2 = x1 - ds  # Second point BEFORE first point (Good for last point)
+        y1 = f(x1)
+        y2 = f(x2)
+        if polar:
+            xp1 = y1 * cos(x1)
+            yp1 = y1 * sin(x1)
+            xp2 = y2 * cos(x2)
+            yp2 = y2 * sin(x2)
+            x1 = xp1
+            y1 = yp1
+            x2 = xp2
+            y2 = yp2
+        if fponum or polar:  # numerical derivative
+            dx1 = (x1 - x2) / ds
+            dy1 = (y1 - y2) / ds
+        else:  # derivative given by the user
+            dx1 = 1  # Only works for rectangular coordinates
+            dy1 = fp(x1)
+        # 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),
+                ],
+            ]
+        )
+        x0 = x1  # Next segment's start is this segments end
+        y0 = y1
+        dx0 = dx1  # Assume the function is smooth everywhere, so carry over the derivative too
+        dy0 = dy1
+    if endpts:
+        a.append(["L", [left + width, coordy(0)]])
+    return a
+
+
+class FuncPlot(inkex.EffectExtension):
+    def add_arguments(self, pars):
+        pars.add_argument("--tab")
+        pars.add_argument("--xstart", type=float, default=0.0, help="Start x-value")
+        pars.add_argument("--xend", type=float, default=1.0, help="End x-value")
+        pars.add_argument(
+            "--times2pi", type=inkex.Boolean, default=False, help="* x-range by 2*pi"
+        )
+        pars.add_argument(
+            "--polar", type=inkex.Boolean, default=False, help="Use polar coords"
+        )
+        pars.add_argument(
+            "--ybottom", type=float, default=0.0, help="y-value of rect's bottom"
+        )
+        pars.add_argument(
+            "--ytop", type=float, default=1.0, help="y-value of rectangle's top"
+        )
+        pars.add_argument("--samples", type=int, default=8, help="Samples")
+        pars.add_argument("--fofx", default="sin(x)", help="f(x) for plotting")
+        pars.add_argument(
+            "--fponum", type=inkex.Boolean, default=True, help="Numerical 1st deriv"
+        )
+        pars.add_argument("--fpofx", default="cos(x)", help="f'(x) for plotting")
+        pars.add_argument(
+            "--clip", type=inkex.Boolean, default=False, help="Clip with source rect"
+        )
+        pars.add_argument(
+            "--remove", type=inkex.Boolean, default=True, help="Remove source rect"
+        )
+        pars.add_argument(
+            "--isoscale", type=inkex.Boolean, default=True, help="Isotropic scaling"
+        )
+        pars.add_argument(
+            "--drawaxis", type=inkex.Boolean, default=False, help="Draw axis"
+        )
+        pars.add_argument(
+            "--endpts", type=inkex.Boolean, default=False, help="Add end points"
+        )
+
+    def effect(self):
+        newpath = None
+        for node in self.svg.selection.values():
+            if isinstance(node, Rectangle):
+                # create new path with basic dimensions of selected rectangle
+                newpath = inkex.PathElement()
+                x = float(node.get("x"))
+                y = float(node.get("y"))
+                w = float(node.get("width"))
+                h = 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.xstart,
+                    self.options.xend,
+                    self.options.ybottom,
+                    self.options.ytop,
+                    self.options.samples,
+                    w,
+                    h,
+                    x,
+                    y + h,
+                    self.options.fofx,
+                    self.options.fpofx,
+                    self.options.fponum,
+                    self.options.times2pi,
+                    self.options.polar,
+                    self.options.isoscale,
+                    self.options.drawaxis,
+                    self.options.endpts,
+                )
+                newpath.set("title", self.options.fofx)
+
+                # add path into SVG structure
+                node.getparent().append(newpath)
+                # option whether to clip the path with rect or not.
+                if self.options.clip:
+                    clip = self.svg.defs.add(ClipPath())
+                    clip.set_random_id()
+                    clip.append(node.copy())
+                    newpath.set("clip-path", clip.get_id(as_url=2))
+                # option whether to remove the rectangle or not.
+                if self.options.remove:
+                    node.getparent().remove(node)
+        if newpath is None:
+            raise inkex.AbortExtension(_("Please select a rectangle"))
+
+
+if __name__ == "__main__":
+    FuncPlot().run()