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__init__.py
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__init__.py
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#!python -u
# -*- coding: utf-8 -*-
import sys
import os
from os.path import join, abspath, dirname, expandvars
from collections import namedtuple
import svgplotlib.Config as Config
from freetype import FT2Font
from svgplotlib.SVG import SVG, tex_parser, tex_fonts
from svgplotlib.Scale import Scale
Size = namedtuple('Size', 'width height descent')
class Base(SVG):
"""
Base class for all plots
"""
PAD = 10
TICK = 20
# default color scheme (plotkit)
COLORS = (
"#476fb2",
"#be2c2b",
"#85b730",
"#734a99",
"#26a1c5",
"#fb8707",
)
def __init__(self, *args, **kwargs):
super( Base , self ).__init__(*args,**kwargs)
self.xscale, self.yscale = 1.,1.
self.xmajorTicks, self.xminorTicks = None,None
self.ymajorTicks, self.yminorTicks = None,None
# font
self.fontFamily = kwargs.get('fontFamily', Config.DEFAULTFONT )
self.fontStyle = kwargs.get('fontStyle', Config.DEFAULTFONTSTYLE)
self.fontSize = kwargs.get('fontSize', Config.DEFAULTFONTSIZE )
font = self.font = getFont(family = self.fontFamily, style = self.fontStyle)
font.set_size(self.fontSize)
def textSize(self, text):
if not text:
return Size(0., 0., 0.)
self.font.set_text(text)
width, height = self.font.get_width_height()
descent = self.font.get_descent()
return Size(width/64., height/64., descent/64.)
def TEXSize(self, text, fontSize = 24, dpi = 72):
if not text:
return Size(0., 0., 0.)
box = tex_parser.parse(text, tex_fonts, fontSize, dpi)
return Size(box.width, box.height, box.depth - 5)
def buildTicks(self, minx, maxx, maxNumSteps = 5, maxMinSteps = 2):
scale = Scale()
stepSize = scale.autoScale(minx, maxx, maxNumSteps)
x1, x2 = scale.buildTicks(minx, maxx, stepSize, maxMinSteps = maxMinSteps)
return x1, x2
def grid(self):
xscale = self.xscale
yscale = self.yscale
width = self.plotWidth
height = self.plotHeight
path_data = []
add = path_data.append
if not self.ymajorTicks is None:
for y in self.ymajorTicks[1:-1]:
ypos = height - (y - self.miny)*yscale
add('M %g,%g' % (0 + self.TICK, ypos))
add('L %g,%g' % (width - self.TICK, ypos))
if not self.xmajorTicks is None:
for x in self.xmajorTicks[1:-1]:
xpos = (x - self.minx)*self.xscale
add('M %g,%g' % (xpos, 0 + self.TICK))
add('L %g,%g' % (xpos, height - self.TICK))
if path_data:
self.plotArea.Path(d = ' '.join(path_data), stroke_dasharray="2 5")
def xaxis(self, pos, flip = False, text = True, fmt = None):
xscale = self.xscale
if fmt is None:
fmt = lambda x: u"%g" % x
sc = -1 if flip else 1
path_data = []
add = path_data.append
for x in self.xmajorTicks[1:-1]:
x = x - self.minx
xpos = x*self.xscale
add('M %g,%g' % (xpos, pos))
add('L %g,%g' % (xpos, pos - sc*self.TICK))
if text:
for x in self.xmajorTicks:
s = unicode(fmt(x))
size = self.textSize(s)
x = x - self.minx
if flip:
ypos = pos - .5*self.fontSize
else:
ypos = pos + size.height + .5*self.fontSize
xpos = x*self.xscale - .5*size.width
self.plotArea.EText(self.font, s, x = xpos, y = ypos, **self.textStyle)
for x in self.xminorTicks:
x = x - self.minx
add('M %g,%g' % (x*xscale, pos))
add('L %g,%g' % (x*xscale, pos - .5*sc*self.TICK))
self.plotArea.Path(d = ' '.join(path_data))
def yaxis(self, pos, flip = False, text = True, fmt = None):
yscale = self.yscale
height = self.plotHeight
sc = -1 if flip else 1
if fmt is None:
fmt = lambda y: u"%g" % y
path_data = []
add = path_data.append
for y in self.ymajorTicks[1:-1]:
y = y - self.miny
ypos = height - y*yscale
add('M %g,%g' % (pos, ypos))
add('L %g,%g' % (pos + sc*self.TICK, ypos))
if text:
for y in self.ymajorTicks:
s = unicode(fmt(y))
size = self.textSize(s)
y = y - self.miny
if flip:
xpos = pos + self.PAD
else:
xpos = pos - self.PAD - size.width
ypos = height - y*yscale + .5*size.height
self.plotArea.EText(self.font, s, x = xpos, y = ypos, **self.textStyle)
for y in self.yminorTicks:
y = y - self.miny
ypos = height - y*yscale
add('M %g,%g' % (pos, ypos))
add('L %g,%g' % (pos + .5*sc*self.TICK, ypos))
self.plotArea.Path(d = ' '.join(path_data))
class Font(FT2Font):
def __init__(self, fname):
FT2Font.__init__(self, fname)
def SVGGlyphs(self, text, glyps_seen = None):
'''
Return SVG paths of glyps
'''
if glyps_seen is None:
glyps_seen = set()
family = self.family_name.replace(' ','')
style = self.style_name.replace(' ','')
glyph_map = {}
cmap = self.get_charmap()
lastgind = None
currx = 0
xpositions = []
glyph_ids = []
for c in text:
ccode = ord(c)
gind = cmap.get(ccode)
if gind is None:
ccode = ord('?')
gind = 0
if lastgind is None:
kern = 0
else:
kern = self.get_kerning(lastgind, gind)
glyph = self.load_char(ccode)
char_id = "%s-%s-%d" % (family, style, ccode)
if not char_id in glyps_seen:
path_data = []
append = path_data.append
for step in glyph.path:
code = step[0]
if code == 0: # MOVE_TO
x, y = step[1:]
append('M %g %g' % (x, -y))
elif code == 1: # LINE_TO
x, y = step[1:]
append('L %g %g' % (x, -y))
elif code == 2: # CURVE3
x1, y1, x2, y2 = step[1:]
append('Q %g %g %g %g' % (x1, -y1, x2, -y2))
elif code == 3: # CURVE4
x1, y1, x2, y2, x3, y3 = step[1:]
append('C %g %g %g %g %g %g' % (x1, -y1, x2, -y2, x3, -y3))
elif code == 4: # ENDPOLY
append('Z')
glyps_seen.add(char_id)
glyph_map[char_id] = " ".join(path_data)
currx += (kern / 64.0)
xpositions.append(currx)
glyph_ids.append(char_id)
currx += glyph.linearHoriAdvance / 65536.
lastgind = gind
return xpositions, glyph_ids, glyph_map
_fonts = {}
def getFont(family = Config.DEFAULTFONT, style = Config.DEFAULTFONTSTYLE):
try:
variants = _fonts[family]
except KeyError:
variants = _fonts[Config.DEFAULTFONT]
try:
path = variants[style]
except KeyError:
path = variants[Config.DEFAULTFONTSTYLE]
return Font(path)
# load fonts into dict
config = Config.config
if config.has_option('fonts', 'fontpaths'):
fontpaths = config.get('fonts', 'fontpaths').split(';')
else:
defaults = config.defaults()
fontpaths = defaults['defaultfonts'], defaults['sysfonts']
for fontpath in fontpaths:
if not os.path.exists(fontpath):
continue
for filename in os.listdir(fontpath):
name, ext = os.path.splitext(filename)
if ext.lower() not in frozenset(('.ttf', '.otf')):
continue
path = os.path.join(fontpath, filename)
font = FT2Font(path)
_fonts.setdefault(font.family_name, {})[font.style_name] = path
if __name__ == '__main__':
font = getFont()
print font