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#!/usr/bin/env python
# vim: set expandtab ts=4:
import cairo, pango, pangocairo
import qrcode
from math import pi
dummysurface = cairo.ImageSurface(cairo.FORMAT_A1, 1, 1)
dummyctx = cairo.Context(dummysurface)
class PTLayoutElem(object):
def __init__(self):
super(PTLayoutElem, self).__init__()
def prep_size(self, h):
return (0, 0)
def render(self, cctx, h):
return 0
def children(self):
return []
def properties(self):
return []
class PTLText(PTLayoutElem):
def __init__(self):
super(PTLText, self).__init__()
self.text = ''
self.font = ''
self.mode = ''
def properties(self):
return [
('text', 'text'),
('font', 'text'),
('mode', 'text'),
]
def prep_size(self, h):
return self._render(dummyctx, True, h)
def render(self, cctx, h):
return self._render(cctx, False, h)
def _render(self, cctx, sizeonly, h):
pctx = pangocairo.CairoContext(cctx)
font = pango.FontDescription(self.font if self.font != '' else 'Delicious 24')
layout = pctx.create_layout()
layout.set_font_description(font)
layout.set_text(unicode(self.text))
size = layout.get_pixel_size()
if sizeonly:
if self.mode in ['left', 'right']:
return (size[1], size[0])
return size
w = size[0]
matrix = cctx.get_matrix()
if self.mode == 'right':
cctx.rotate(90. * pi / 180.)
cctx.translate((h - size[0]) / 2, -size[1])
w = size[1]
elif self.mode == 'left':
cctx.rotate(-90. * pi / 180.)
cctx.translate(-h + (h - size[0]) / 2, 0)
w = size[1]
elif self.mode == 'down':
cctx.rotate(pi)
cctx.translate(-size[0], -(h + size[1]) / 2)
else:
cctx.translate(0, (h - size[1]) / 2)
pctx.update_layout(layout)
pctx.show_layout(layout)
cctx.set_matrix(matrix)
return w
class PTLQRCode(PTLayoutElem):
def __init__(self):
super(PTLQRCode, self).__init__()
self.qrcontent = ''
self.hborder = 4
self.vborder = 4
self.invert = False
def properties(self):
return [
('qrcontent', 'text'),
]
def prep_size(self, h):
return self._render(dummyctx, True, h)
def render(self, cctx, h):
return self._render(cctx, False, h)
def _render(self, cctx, sizeonly, h):
qr = qrcode.QRCode(border = 0, error_correction = qrcode.ERROR_CORRECT_L)
qr.add_data(self.qrcontent)
qr.make(fit = True)
qm = qr.get_matrix()
qmlen = len(qm)
bpp = (h - self.vborder) / qmlen
if sizeonly: return (bpp * qmlen + self.hborder * 2, bpp * qmlen + self.vborder * 2)
if self.invert:
cctx.rectangle(0, 0, bpp * qmlen + self.hborder * 2, h + self.vborder * 2)
cctx.fill()
cctx.set_source_rgba(1.0, 1.0, 1.0, 0.0)
yoffs = (h - bpp * qmlen) / 2
for y, line in enumerate(qm):
for x, dot in enumerate(line):
if dot:
cctx.rectangle(bpp * x + self.hborder, bpp * y + yoffs, bpp, bpp)
cctx.fill()
cctx.set_source_rgba(0.0, 0.0, 0.0, 1.0)
return bpp * qmlen + self.hborder * 2
class PTLContainer(PTLayoutElem):
def __init__(self):
super(PTLContainer, self).__init__()
self._children = []
def children(self):
return self._children
def add(self, child):
self._children.append(child)
class PTLHSeq(PTLContainer):
def __init__(self):
super(PTLHSeq, self).__init__()
self.spacing = 5
def prep_size(self, hh):
if len(self._children) == 0:
return (0,0)
w, h = (len(self._children) - 1) * self.spacing, 0
for k in self._children:
cw, ch = k.prep_size(hh)
w += cw
h = max(h, ch)
return (w, h)
def render(self, cctx, h):
wpos = 0
for k in self._children:
cw = k.render(cctx, h)
wpos += cw + self.spacing
cctx.translate(cw + self.spacing, 0)
cctx.translate(-wpos, 0)
return wpos - self.spacing
class PTLVStack(PTLContainer):
def __init__(self):
super(PTLVStack, self).__init__()
def prep_size(self, hh):
w = 0
for k in self._children:
cw, ch = k.prep_size(hh / len(self._children))
w = max(w, cw)
return (w, hh)
def render(self, cctx, h):
w = 0
for i, k in enumerate(self._children):
vpos = int(h / float(len(self._children)) * i)
cctx.translate(0, vpos)
cw = k.render(cctx, h)
w = max(cw, w)
cctx.translate(0, -vpos)
return w
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