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SVGWriter.py
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SVGWriter.py
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#!/usr/bin/env python3
# -*- coding: utf-8, vim: expandtab:ts=4 -*-
"""\
SVG.py - Construct/display SVG scenes.
The following code is a lightweight wrapper around SVG files. The metaphor
is to construct a scene, add objects to it, and then write it to a file
to display it.
This program uses ImageMagick to display the SVG files. ImageMagick also
does a remarkable job of converting SVG files into other formats.
This is an enhanced Version of Rick Muller's Code from
http://code.activestate.com/recipes/325823-draw-svg-images-in-python/
"""
import os
display_prog = "display"
import copy
class Scene:
def __init__(self, name="svg", width=400, height=400):
self.name = name
self.items = []
self.height = height
self.width = width
self._color = (0, 0, 0)
self.offsetx = 0
self.offsety = 0
self.svgname = None
def translate(self, offx, offy):
self.offsetx += offx
self.offsety += offy
@property
def color(self):
return self._color
@color.setter
def color(self, value):
self._color = value
def add(self, item): self.items.append(item)
def strarray(self):
var = ["<?xml version=\"1.0\"?>\n",
"<svg height=\"%d\" width=\"%d\" xmlns=\"http://www.w3.org/2000/svg\">\n" % (self.height, self.width),
" <g style=\"fill-opacity:1.0; stroke:black;\n",
" stroke-width:1;\">\n"]
for item in self.items:
var += item.strarray()
var += [" </g>\n</svg>\n"]
return var
def write_svg(self, filename=None):
if filename:
self.svgname = filename
else:
self.svgname = self.name + ".svg"
file = open(self.svgname, 'w')
print(self.svgname)
file.writelines(self.strarray())
file.close()
return
def display(self, prog=display_prog):
os.system("%s %s" % (prog, self.svgname))
return
class Line:
def __init__(self, scene, start, end, color, width=1):
self.start = start
self.end = end
self.color = color
self.width = width
self.offsetx = scene.offsetx
self.offsety = scene.offsety
return
def strarray(self):
return [" <line x1=\"%d\" y1=\"%d\" x2=\"%d\" y2=\"%d\" style=\"stroke:%s;stroke-width:%d\"/>\n" %
(self.start[0]+self.offsetx, self.start[1]+self.offsety, self.end[0]+self.offsetx,
self.end[1]+self.offsety, colorstr(self.color), self.width)]
class QuadraticBezierCurve:
def __init__(self, scene, start, control1, control2, end, color, width=1):
# middlex = start[0] - middle[0]
# middley = start[1] - middle[1]
# endx = start[0] - end[0]
# endy = start[1] - end[1]
self.start = start
self.control1 = control1
self.control2 = control2
self.end = end
self.color = color
self.width = width
self.offsetx = scene.offsetx
self.offsety = scene.offsety
return
def strarray(self):
return [" <path d=\"M %d %d C %d %d %d %d %d %d\" style=\"stroke:%s;stroke-width:%d\" fill=\"none\" />\n" %
(self.start[0]+self.offsetx, self.start[1]+self.offsety, self.control1[0]+self.offsetx,
self.control1[1]+self.offsety, self.control2[0]+self.offsetx, self.control2[1]+self.offsety,
self.end[0]+self.offsetx, self.end[1]+self.offsety, colorstr(self.color), self.width)]
# TODO <path d="M 100 350 q 150 -300 300 0" stroke="blue" stroke-width="5" fill="none" />
class Circle:
def __init__(self, center, radius, fill_color, line_color, line_width):
self.center = center
self.radius = radius
self.fill_color = fill_color
self.line_color = line_color
self.line_width = line_width
return
def strarray(self):
return [" <circle cx=\"%d\" cy=\"%d\" r=\"%d\"\n" %
(self.center[0], self.center[1], self.radius),
" style=\"fill:%s;stroke:%s;stroke-width:%d\" />\n" %
(colorstr(self.fill_color), colorstr(self.line_color), self.line_width)]
class HalfCircle:
id = 0
def __init__(self, center, radius, line_color, line_width):
self.center = center
self.radius = radius
self.line_color = line_color
self.line_width = line_width
HalfCircle.id += 1
self.id = HalfCircle.id
return
def strarray(self):
clip = "<clipPath id=\"cut-off-bottom%d\"> \n <rect x=\"%d\" y=\"%d\" width=\"%d\" height=\"%d\" /> \n" \
" </clipPath>" % (self.id, self.center[0]-self.radius, self.center[1], self.radius*2,
self.radius)
circle = "<circle cx=\"%d\" cy=\"%d\" r=\"%d\" clip-path=\"url(#cut-off-bottom%d)\" style=\"stroke:%s;stroke-width:%dfill-opacity: 1\"/>" %\
(self.center[0], self.center[1], self.radius, self.id, colorstr(self.line_color), self.line_width)
return clip + "\n" + circle
# return [" <circle cx=\"%d\" cy=\"%d\" r=\"%d\"\n" %
# (self.center[0],self.center[1],self.radius),
# " style=\"fill:%s;stroke:%s;stroke-width:%d\" />\n" % (colorstr(self.fill_color),colorstr(self.line_color),self.line_width)]
class Ellipse:
def __init__(self, center, radius_x, radius_y, fill_color, line_color, line_width):
self.center = center
self.radiusx = radius_x
self.radiusy = radius_y
self.fill_color = fill_color
self.line_color = line_color
self.line_width = line_width
def strarray(self):
return [" <ellipse cx=\"%d\" cy=\"%d\" rx=\"%d\" ry=\"%d\"\n" %
(self.center[0], self.center[1], self.radiusx, self.radiusy),
" style=\"fill:%s;stroke:%s;stroke-width:%d\"/>\n" %
(colorstr(self.fill_color), colorstr(self.line_color), self.line_width)]
class Polygon:
def __init__(self, points, fill_color, line_color, line_width):
self.points = points
self.fill_color = fill_color
self.line_color = line_color
self.line_width = line_width
def strarray(self):
polygon = "<polygon points=\""
for point in self.points:
polygon += " %d,%d" % (point[0], point[1])
return [polygon,
"\" \nstyle=\"fill:%s;stroke:%s;stroke-width:%d\"/>\n" %
(colorstr(self.fill_color), colorstr(self.line_color), self.line_width)]
class Rectangle:
def __init__(self, scene, origin, width, height, fill_color, line_color, line_width):
self.origin = origin
self.height = height
self.width = width
self.fill_color = fill_color
self.line_color = line_color
self.line_width = line_width
self.offsetx = scene.offsetx
self.offsety = scene.offsety
return
def strarray(self):
return [" <rect x=\"%d\" y=\"%d\" height=\"%d\"\n" %
(self.origin[0]+self.offsetx, self.origin[1]+self.offsety, self.height),
" width=\"%d\" style=\"fill:%s;stroke:%s;stroke-width:%d\" />\n" %
(self.width, colorstr(self.fill_color), colorstr(self.line_color), self.line_width)]
class Text:
def __init__(self, scene, origin, text, size, color):
self.origin = origin
self.text = str(text)
self.size = size
self.color = color
self.offsetx = scene.offsetx
self.offsety = scene.offsety
return
def strarray(self):
return [" <text x=\"%d\" y=\"%d\" font-size=\"%d\" fill=\"%s\" text-anchor=\"middle\" "
"alignment-baseline=\"central\" style=\"font-family: Consolas\" >\n" %
(self.origin[0]+self.offsetx, self.origin[1]+self.offsety, self.size, colorstr(self.color)),
" %s\n" % self.text,
" </text>\n"]
def getWidth(self):
return len(self.text) * 6
class TextToken:
def __init__(self, scene, origin, text, size, color):
self.origin = origin
self.text = text
self.size = size
self.color = color
self.offsetx = scene.offsetx
self.offsety = scene.offsety
return
def strarray(self):
return [" <text x=\"%d\" y=\"%d\" font-size=\"%d\" fill=\"%s\" style=\"font-family: Consolas\">\n" %
(self.origin[0]+self.offsetx, self.origin[1]+self.offsety, self.size, colorstr(self.color)),
" %s\n" % self.text,
" </text>\n"]
def getWidth(self):
return len(self.text) * 6
def colorstr(rgb):
return "rgb(%d,%d,%d)" % (rgb[0], rgb[1], rgb[2])
def test():
scene = Scene("test")
scene.add(Rectangle(scene, (100, 100), 200, 200, (0, 255, 255), (0, 0, 0), 1))
scene.add(Line(scene, (200, 200), (200, 300), (0, 0, 0)))
scene.add(Line(scene, (200, 200), (300, 200), (0, 0, 0)))
scene.add(Line(scene, (200, 200), (100, 200), (0, 0, 0)))
scene.add(Line(scene, (200, 200), (200, 100), (0, 0, 0)))
scene.add(Circle((200, 200), 30, (0, 0, 255), (0, 0, 0), 1))
scene.add(Circle((200, 300), 30, (0, 255, 0), (0, 0, 0), 1))
scene.add(Circle((300, 200), 30, (255, 0, 0), (0, 0, 0), 1))
scene.add(Circle((100, 200), 30, (255, 255, 0), (0, 0, 0), 1))
scene.add(Circle((200, 100), 30, (255, 0, 255), (0, 0, 0), 1))
scene.add(Text(scene, (100, 50), "Testing SVG2", 24, (255, 255, 51)))
scene.write_svg()
scene.display()
return
def test2():
scene = Scene("test", 1400, 1400, )
# scene.add(Rectangle(scene, (100, 100), 200, 200, (0, 255, 255), (0, 0, 0), 1))
# scene.add(QuadraticBezierCurve(scene, (100, 200), (50, -250), (100, 0), (100, 0), (0, 255, 0), 1))
scene.add(Text(scene, (150, 150), "Testing SVG bezier", 24, (0, 0, 0)))
scene.add(HalfCircle((450, 450), 250, (0, 0, 255), 6))
scene.write_svg()
scene.display()
return
if __name__ == "__main__":
test2()