266 lines
12 KiB
Python
266 lines
12 KiB
Python
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#!/usr/bin/env python3
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'''
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Globe rendering extension for Inkscape
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Copyright (C) 2009 Gerrit Karius
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (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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About the Globe rendering extension:
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'''
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from __future__ import division
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import inkex
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from math import *
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from lxml import etree
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#TODO: put the globe in the center of the view canvas
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def draw_ellipse_rotated(cx,cy,rx,ry, width, fill, name, parent, rotationAngle):
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a = cos(rotationAngle)
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b = sin(rotationAngle)
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c = -sin(rotationAngle)
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d = cos(rotationAngle)
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e = -(a*cx + c*cy) + cx
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f = -(b*cx + d*cy) + cy
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style = { 'stroke': '#000000', 'stroke-width':str(width), 'fill':fill}
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if rx == 0:
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x1 = cx
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x2 = cx
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y1 = cy - ry
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y2 = cy + ry
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circle_attribs = {'style':str(inkex.Style(style)),
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inkex.addNS('label','inkscape'):name,
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'd':'M '+str(x1)+','+str(y1)+' L '+str(x2)+','+str(y2),
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'transform':'matrix('+str(a)+','+str(b)+','+str(c)+','+str(d)+','+str(e)+','+str(f)+')'}
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elif ry == 0:
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x1 = cx - rx
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x2 = cx + rx
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y1 = cy
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y2 = cy
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circle_attribs = {'style':str(inkex.Style(style)),
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inkex.addNS('label','inkscape'):name,
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'd':'M '+str(x1)+','+str(y1)+' L '+str(x2)+','+str(y2),
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'transform':'matrix('+str(a)+','+str(b)+','+str(c)+','+str(d)+','+str(e)+','+str(f)+')'}
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else:
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circle_attribs = {'style':str(inkex.Style(style)),
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inkex.addNS('label','inkscape'):name,
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inkex.addNS('cx','sodipodi'):str(cx),
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inkex.addNS('cy','sodipodi'):str(cy),
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inkex.addNS('rx','sodipodi'):str(rx),
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inkex.addNS('ry','sodipodi'):str(ry),
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inkex.addNS('type','sodipodi'):'arc',
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'transform':'matrix('+str(a)+','+str(b)+','+str(c)+','+str(d)+','+str(e)+','+str(f)+')'}
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etree.SubElement(parent, inkex.addNS('path','svg'), circle_attribs)
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def draw_ellipse_segment_rotated(cx,cy,rx,ry, width, fill, name, parent, rotationAngle, segmentAngleStart, segmentAngleEnd):
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a = cos(rotationAngle)
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b = sin(rotationAngle)
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c = -sin(rotationAngle)
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d = cos(rotationAngle)
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e = -(a*cx + c*cy) + cx
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f = -(b*cx + d*cy) + cy
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style = { 'stroke': '#000000', 'stroke-width':str(width), 'fill':fill}
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if rx == 0:
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x1 = cx
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x2 = cx
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y1 = cy - ry
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y2 = cy + ry
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circle_attribs = {'style':str(inkex.Style(style)),
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inkex.addNS('label','inkscape'):name,
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'd':'M '+str(x1)+','+str(y1)+' L '+str(x2)+','+str(y2),
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'transform':'matrix('+str(a)+','+str(b)+','+str(c)+','+str(d)+','+str(e)+','+str(f)+')'}
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elif ry == 0:
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x1 = cx - rx
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x2 = cx + rx
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y1 = cy
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y2 = cy
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circle_attribs = {'style':str(inkex.Style(style)),
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inkex.addNS('label','inkscape'):name,
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'd':'M '+str(x1)+','+str(y1)+' L '+str(x2)+','+str(y2),
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'transform':'matrix('+str(a)+','+str(b)+','+str(c)+','+str(d)+','+str(e)+','+str(f)+')'}
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else:
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circle_attribs = {'style':str(inkex.Style(style)),
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inkex.addNS('label','inkscape'):name,
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inkex.addNS('cx','sodipodi'):str(cx),
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inkex.addNS('cy','sodipodi'):str(cy),
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inkex.addNS('rx','sodipodi'):str(rx),
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inkex.addNS('ry','sodipodi'):str(ry),
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inkex.addNS('start','sodipodi'):str(segmentAngleStart),
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inkex.addNS('end','sodipodi'):str(segmentAngleEnd),
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inkex.addNS('open','sodipodi'):'true',
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inkex.addNS('type','sodipodi'):'arc',
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'transform':'matrix('+str(a)+','+str(b)+','+str(c)+','+str(d)+','+str(e)+','+str(f)+')'}
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etree.SubElement(parent, inkex.addNS('path','svg'), circle_attribs)
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class Globe(inkex.EffectExtension):
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def add_arguments(self, pars):
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pars.add_argument("--longitudeLineCount", type=int, default=15, help="Number of longitude lines")
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pars.add_argument("--latitudeLineCount", type=int, default=15, help="Number of latitude lines")
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pars.add_argument("--rotationXDegrees", type=float, default=45, help="Rotation around X axis (degrees)")
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pars.add_argument("--rotationYDegrees", type=float, default=-45, help="Rotation around Y axis (degrees)")
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pars.add_argument("--isSeeThrough", type=inkex.Boolean, default=False, help="Is the globe see-through")
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def effect(self):
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name = 'globe'
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# globe fill and stroke style
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fill = 'none'
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width = 1
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#input parameters - globe center and radius
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cyb = 500.0
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cxb = 500.0
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rb = 100.0
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longitudeRotationAngleDegrees = float(self.options.rotationYDegrees)
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tiltForwardAngleDegrees = float(self.options.rotationXDegrees)
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# inputs range fixing
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# tiltForwardAngle is adjusted to vary from 0 <= angle < pi
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if tiltForwardAngleDegrees >= 180.0:
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tiltForwardAngleDegrees -= 180.0
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elif tiltForwardAngleDegrees < 180.0:
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tiltForwardAngleDegrees += 180.0
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if self.options.longitudeLineCount > 0:
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angleSpacingLongitudeLinesDegrees = 180.0 / float(self.options.longitudeLineCount);
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# longitudeAngle is wrapped to vary from 0 <= angle < angleSpacingLongitudeLines.
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while longitudeRotationAngleDegrees < 0:
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longitudeRotationAngleDegrees += angleSpacingLongitudeLinesDegrees
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while longitudeRotationAngleDegrees >= angleSpacingLongitudeLinesDegrees:
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longitudeRotationAngleDegrees -= angleSpacingLongitudeLinesDegrees
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# units conversion from degrees to radians
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tiltForwardAngle = tiltForwardAngleDegrees * pi / 180.0;
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initialAngleLongitudeLines = longitudeRotationAngleDegrees * pi / 180.0
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# derived parameters
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rxb = rb
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ryb = rb
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#
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# start drawing
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#
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# create the group to put the globe in
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group_attribs = {inkex.addNS('label','inkscape'):name}
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parent = etree.SubElement(self.svg.get_current_layer(), 'g', group_attribs)
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# draw the outside border
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draw_ellipse_rotated(cxb,cyb,rxb,ryb, width, fill, 'border', parent, 0)
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# draw the longitude lines
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# elipse #0 corresponds to ring on the front (visible only as a straight vertical line)
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# elipse #n-1 corresponds to the ring that is almost 180 degrees away
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# elipse #n/2 corresponds to ring around the side (overlaps with globe boundary) (only if n is even)
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if self.options.longitudeLineCount > 0:
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angleSpacingLongitudeLines = pi / float(self.options.longitudeLineCount);
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yOfPole = ryb * cos(tiltForwardAngle)
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for i in range(0, self.options.longitudeLineCount):
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lineName = 'longitude' + str(i)
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# longitudeAngle is always from 0 to pi.
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# rotation angle is always from 0 to pi.
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# rx is never negative.
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longitudeAngle = ((float(i)) * angleSpacingLongitudeLines) + initialAngleLongitudeLines
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if tiltForwardAngleDegrees == 0 or tiltForwardAngleDegrees == 180.0:
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if longitudeAngle < pi/2:
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rotationAngle = 0.0
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else:
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rotationAngle = pi
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rx = rxb * sin(longitudeAngle)
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arcStart = pi/2
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arcEnd = -pi/2
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else:
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rotationAngle = acos(cos(longitudeAngle) / sqrt(1 - pow(sin(longitudeAngle)*cos(tiltForwardAngle), 2)))
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rx = rxb * sin(longitudeAngle) * cos(tiltForwardAngle)
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if rx < 0:
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rx = -rx
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arcStart = -pi/2
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arcEnd = pi/2
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else:
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arcStart = pi/2
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arcEnd = -pi/2
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ry = ryb
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cx = cxb
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cy = cyb
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if self.options.isSeeThrough:
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draw_ellipse_rotated(cx,cy,rx,ry, width, fill, lineName, parent, rotationAngle)
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else:
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draw_ellipse_segment_rotated(cx,cy,rx,ry, width, fill, lineName, parent, rotationAngle, arcStart, arcEnd)
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# draw the latitude lines
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# elipse #0 corresponds to ring closest to north pole.
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# elipse #n-1 corresponds to ring closest to south pole.
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# equator is ring #(n-1)/2 (only if n is odd).
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if self.options.latitudeLineCount > 0:
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angleSpacingLatitudeLines = pi / (1.0 + float(self.options.latitudeLineCount));
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yOfPole = ryb * cos(tiltForwardAngle)
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for i in range(0, self.options.latitudeLineCount):
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lineName = 'latitude' + str(i)
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# angleOfCurrentLatitudeLine is always from 0 to pi.
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# tiltForwardAngle is always from 0 to pi.
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# ry is never negative.
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angleOfCurrentLatitudeLine = float(i + 1) * angleSpacingLatitudeLines
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rx = rxb * sin(angleOfCurrentLatitudeLine)
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ry = rx * sin(tiltForwardAngle)
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cx = cxb
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cy = cyb - yOfPole*cos(angleOfCurrentLatitudeLine)
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if self.options.isSeeThrough:
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#inkex.utils.debug(cx)
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#inkex.utils.debug(cy)
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#inkex.utils.debug(rx)
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#inkex.utils.debug(ry)
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#inkex.utils.debug(width)
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#inkex.utils.debug(fill)
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#inkex.utils.debug(lineName)
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#inkex.utils.debug(parent)
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draw_ellipse_rotated(cx,cy,rx,ry, width, fill, lineName, parent, 0)
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else:
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if tiltForwardAngle > pi/2:
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# tilt away from viewaer
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if rxb * cos(angleOfCurrentLatitudeLine) / cos(tiltForwardAngle) > rxb:
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# elipse is not visible
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pass
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else:
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if rxb * cos(angleOfCurrentLatitudeLine) / cos(tiltForwardAngle) < -rxb:
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# elipse is all visible
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segmentAngle = pi
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else:
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# elipse is only partially visible
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segmentAngle = acos(max(-1,min(1, -tan(tiltForwardAngle) / tan(angleOfCurrentLatitudeLine))))
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draw_ellipse_segment_rotated(cx,cy,rx,ry, width, fill, lineName, parent, 0, pi/2+segmentAngle, pi/2-segmentAngle)
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else:
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# tilt towards viewer
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if rxb * cos(angleOfCurrentLatitudeLine) / cos(tiltForwardAngle) < -rxb:
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# elipse is not visible
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pass
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else:
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if rxb * cos(angleOfCurrentLatitudeLine) / cos(tiltForwardAngle) > rxb:
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# elipse is all visible
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segmentAngle = pi
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else:
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# elipse is only partially visible
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segmentAngle = acos(max(-1,min(1, tan(tiltForwardAngle) / tan(angleOfCurrentLatitudeLine))))
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draw_ellipse_segment_rotated(cx,cy,rx,ry, width, fill, lineName, parent, 0, -pi/2+segmentAngle, -pi/2-segmentAngle)
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if __name__ == '__main__':
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Globe().run()
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