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# PyDia Standard Dia Renderer
# Copyright (c) 2009 Hans Breuer <hans@breuer.org>
#
# A renderer which outputs Dia "Standard - *" Objects in Dia XML
# by implementing the renderer interface.
# 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., 675 Mass Ave, Cambridge, MA 02139, USA.
import sys, string, os, math, dia
class StandardDiaRenderer :
def __init__ (self) :
self.f = None
self.line_width = 0.1
self.line_caps = 0
self.line_join = 0
self.line_style = 0
self.dash_length = 0
# every object should have a unique id - mainly for connections definition
self.oid = 0
self.filename = ""
def _open(self, filename) :
self.f = open(filename, "w")
def begin_render (self, data, filename) :
self.filename = filename
self._open (filename)
portrait = "false"
if data.paper.is_portrait :
portrait = "true"
# data.paper doesn't provide margins yet, data.paper.width is _useable_ width
self.f.write('''<?xml version="1.0" encoding="UTF-8"?>
<dia:diagram xmlns:dia="http://www.lysator.liu.se/~alla/dia/">
<!-- Created by dia_standard_dia.py -->
<dia:diagramdata>
<!-- everything is optional here -->
<dia:attribute name="paper">
<dia:composite type="paper">
<dia:attribute name="name">
<dia:string>#%s#</dia:string>
</dia:attribute>
<dia:attribute name="is_portrait">
<dia:boolean val="%s"/>
</dia:attribute>
<dia:attribute name="scaling">
<dia:real val="%.3f"/>
</dia:attribute>
</dia:composite>
</dia:attribute>
</dia:diagramdata>
<dia:layer name="Background" visible="true" >
''' % (data.paper.name, portrait, data.paper.scaling))
def end_render (self) :
self.f.write('''<!-- no connections in the renderer interface -->
</dia:layer>
</dia:diagram>''')
self.f.close()
# some helpers
def _rgb(self, color) :
# given a dia color convert to svg color string
rgb = "#%02X%02X%02X" % (int(255 * color.red), int(color.green * 255), int(color.blue * 255))
return rgb
# http://bugzilla.gnome.org/show_bug.cgi?id=576468 makes this even less desirable
# see also: samples/Self/dia-standard-objects.dia for inconsistency mapping
def _tinting (self, color, fill=None, stroke_key="line_color", width_key="line_width", fill_key="inner_color") :
# maybe this is too smart: fill=0 != fill=None
if fill == None :
attrs = '''
<dia:attribute name="%s">
<dia:color val="%s"/>
</dia:attribute>
<dia:attribute name="%s">
<dia:real val="%.3f"/>
</dia:attribute>
''' % (stroke_key, self._rgb(color), width_key, self.line_width)
elif fill :
attrs = '''
<dia:attribute name="%s">
<dia:color val="%s"/>
</dia:attribute>
<dia:attribute name="show_background">
<dia:boolean val="true"/>
</dia:attribute>
<!-- TODO: folding missing -->
<dia:attribute name="%s">
<dia:color val="%s"/>
</dia:attribute>
<dia:attribute name="%s">
<dia:real val="0"/>
</dia:attribute>
''' % (fill_key, self._rgb(color), stroke_key, self._rgb(color), width_key)
else :
attrs = '''
<dia:attribute name="%s">
<dia:color val="%s"/>
</dia:attribute>
<dia:attribute name="show_background">
<dia:boolean val="false"/>
</dia:attribute>
<dia:attribute name="%s">
<dia:real val="%.3f"/>
</dia:attribute>
''' % (stroke_key, self._rgb(color), width_key, self.line_width)
return attrs
def _stroke_style (self) :
return '''
<dia:attribute name="line_style">
<dia:enum val="%d"/>
</dia:attribute>
<dia:attribute name="dashlength">
<dia:real val="%.3f"/>
</dia:attribute>
''' % (self.line_style, self.dash_length)
# just remember the given state to use it during object creation
def set_linewidth (self, width) :
self.line_width = width
def set_linecaps (self, mode) :
self.line_caps = mode
def set_linejoin (self, mode) :
self.line_join = mode
def set_linestyle (self, style, length) :
self.line_style = style
self.dash_length = length
def set_fillstyle (self, style) :
# currently only 'solid' so not used anywhere else
self.fill_style = style
def set_font (self, font, size) :
self.font = font
self.font_size = size
# now to the actual object creation - it should be 'delayed' to fold draw&fill again,
# split in the rendering process but the Dia's 'Standard' objects can do both in one
def _box (self, rect, color, fill) :
self.oid = self.oid + 1
self.f.write('''
<dia:object type="Standard - Box" version="0" id="O%d">
<dia:attribute name="elem_corner">
<dia:point val="%.3f,%.3f"/>
</dia:attribute>
<dia:attribute name="elem_width">
<dia:real val="%.3f"/>
</dia:attribute>
<dia:attribute name="elem_height">
<dia:real val="%.3f"/>
</dia:attribute>
%s%s
</dia:object>''' % (self.oid, rect.left,rect.top, rect.right - rect.left, rect.bottom - rect.top,
self._tinting(color, fill, 'border_color', 'border_width'), self._stroke_style()))
def draw_rect (self, rect, fill, stroke) :
if fill :
self._box(rect, fill, 1)
if stroke :
self._box(rect, stroke, 0)
def _ellipse (self, center, width, height, color, fill) :
self.oid = self.oid + 1
self.f.write('''
<dia:object type="Standard - Ellipse" version="0" id="O%d">
<dia:attribute name="elem_corner">
<dia:point val="%.3f,%.3f"/>
</dia:attribute>
<dia:attribute name="elem_width">
<dia:real val="%.3f"/>
</dia:attribute>
<dia:attribute name="elem_height">
<dia:real val="%.3f"/>
</dia:attribute>
%s%s
</dia:object>''' % (self.oid, center.x-width/2, center.y-height/2, width, height,
self._tinting(color, fill, 'border_color', 'border_width'), self._stroke_style()))
def draw_ellipse (self, center, width, height, fill, stroke) :
if fill :
self._ellipse(center, width, height, fill, 1)
if stroke :
self._ellipse(center, width, height, stroke, 0)
def _arc(self, center, width, height, angle1, angle2, color, fill) :
self.oid = self.oid + 1
mPi180 = math.pi / 180.0
rx = width / 2.0
ry = height / 2.0
sx = center.x + rx * math.cos(mPi180 * angle1)
sy = center.y - ry * math.sin(mPi180 * angle1)
ex = center.x + rx * math.cos(mPi180 * angle2)
ey = center.y - ry * math.sin(mPi180 * angle2)
# the middle control point
cx = center.x + rx * math.cos(mPi180 * (angle1 + angle2)/2.0)
cy = center.y - ry * math.sin(mPi180 * (angle1 + angle2)/2.0)
dx = (sx + ex) / 2.0 - cx
dy = (sy + ey) / 2.0 - cy
dist = math.sqrt(dx * dx + dy * dy)
if angle1 > angle2 :
dist = -dist
self.f.write('''
<dia:object type="Standard - Arc" version="0" id="O%d">
<dia:attribute name="conn_endpoints">
<dia:point val="%.3f,%.3f"/>
<dia:point val="%.3f,%.3f"/>
</dia:attribute>
<dia:attribute name="curve_distance">
<dia:real val="%.3f"/>
</dia:attribute>
%s%s
</dia:object>''' % (self.oid, sx, sy, ex, ey, dist,
self._tinting(color, fill, 'arc_color'), self._stroke_style()))
def draw_arc (self, center, width, height, angle1, angle2, color) :
self._arc(center, width, height, angle1, angle2, color, None)
def fill_arc (self, center, width, height, angle1, angle2, color) :
self._arc(center, width, height, angle1, angle2, color, 1)
def _poly (self, type_name, points, color, fill) :
self.oid = self.oid + 1
self.f.write('''
<dia:object type="Standard - %s" version="0" id="O%d">
%s%s
<dia:attribute name="poly_points">''' % (type_name, self.oid,
self._tinting(color, fill), self._stroke_style()))
for p in points :
self.f.write('''
<dia:point val="%.3f,%.3f"/>''' % (p.x, p.y))
self.f.write('''
</dia:attribute>
</dia:object>''')
def draw_polyline (self, points, color) :
self._poly("PolyLine", points, color, None)
def stroke_polygon (self, points, color) :
self._poly("Polygon", points, color, 0)
def fill_polygon (self, points, color) :
self._poly("Polygon", points, color, 1)
def draw_polygon (self, points, fill, stroke) :
if fill :
self.fill_polygon(points, fill)
if stroke :
self.stroke_polygon(points, fill)
def _bezier (self, type_name, points, color, fill) :
self.oid = self.oid + 1
self.f.write('''
<dia:object type="Standard - %s" version="0" id="O%d">
%s%s
<dia:attribute name="bez_points">''' % (type_name, self.oid, self._tinting(color, fill), self._stroke_style()))
for bp in points :
if bp.type == 0 : # BEZ_MOVE_TO
# moveto must be first (and only first) otherwise the file format is broken
self.f.write('''
<dia:point val="%.3f,%.3f"/>''' % (bp.p1.x, bp.p1.y))
elif bp.type == 1 : # BEZ_LINE_TO
# simulated by curveto (there is no lineto on the file format level)
self.f.write('''
<dia:point val="%.3f,%.3f"/>
<dia:point val="%.3f,%.3f"/>
<dia:point val="%.3f,%.3f"/>''' % (last.x, last.y, bp.p1.x, bp.p1.y, bp.p1.x, bp.p1.y))
elif bp.type == 2 : # BEZ_CURVE_TO
self.f.write('''
<dia:point val="%.3f,%.3f"/>
<dia:point val="%.3f,%.3f"/>
<dia:point val="%.3f,%.3f"/>''' % (bp.p1.x, bp.p1.y, bp.p2.x, bp.p2.y, bp.p3.x, bp.p3.y))
last = bp.p1
self.f.write('''
</dia:attribute>
</dia:object>''')
def draw_bezier (self, points, color) :
self._bezier("BezierLine", points, color, None)
def fill_bezier (self, points, color) :
self._bezier("Beziergon", points, color, 1)
def draw_string (self, text, pos, alignment, color) :
self.oid = self.oid + 1
self.f.write('''
<dia:object type="Standard - Text" version="1" id="O%d">
<dia:attribute name="obj_pos">
<dia:point val="%.3f,%.3f"/>
</dia:attribute>
<dia:attribute name="text">
<dia:composite type="text">
<dia:attribute name="string">
<dia:string>#%s#</dia:string>
</dia:attribute>
<dia:attribute name="font">
<dia:font family="%s" style="%d"/>
</dia:attribute>
<dia:attribute name="height">
<dia:real val="%.3f"/>
</dia:attribute>
<dia:attribute name="color">
<dia:color val="%s"/>
</dia:attribute>
<dia:attribute name="alignment">
<dia:enum val="%d"/>
</dia:attribute>
</dia:composite>
</dia:attribute>
<dia:attribute name="valign">
<dia:enum val="3"/>
</dia:attribute>
</dia:object>''' % (self.oid, pos.x, pos.y, text.replace("&", "&").replace(">", ">").replace("<", "<"),
self.font.family, self.font.style, self.font_size,
self._rgb(color), alignment))
def draw_image (self, point, width, height, image) :
fname = image.filename
# do something better than absolute pathes
common = os.path.commonprefix ([fname, self.filename])
if len(common) > 0 and string.find(self.filename[len(common):], os.path.pathsep) == -1 :
fname = fname[len(common):]
# ensure <broken> does not get through
fname = fname.replace("&", "&").replace(">", ">").replace("<", "<")
self.oid = self.oid + 1
if abs(width/height - image.width/image.height) < 0.001 :
keep_aspect = "true"
else :
keep_aspect = "false"
self.f.write('''
<dia:object type="Standard - Image" version="0" id="O%d">
<dia:attribute name="elem_corner">
<dia:point val="%.3f,%.3f"/>
</dia:attribute>
<dia:attribute name="elem_width">
<dia:real val="%.3f"/>
</dia:attribute>
<dia:attribute name="elem_height">
<dia:real val="%.3f"/>
</dia:attribute>
<dia:attribute name="file">
<dia:string>#%s#</dia:string>
</dia:attribute>
<dia:attribute name="draw_border">
<dia:boolean val="false"/>
</dia:attribute>
<dia:attribute name="keep_aspect">
<dia:boolean val="%s"/>
</dia:attribute>
</dia:object>''' % (self.oid, point.x,point.y, width, height, fname, keep_aspect))
# defining only this line drawer makes almost everything interpolated
def draw_line (self, start, end, color) :
self.oid = self.oid + 1
self.f.write('''
<dia:object type="Standard - Line" version="0" id="O%d">
<dia:attribute name="conn_endpoints">
<dia:point val="%.3f,%.3f"/>
<dia:point val="%.3f,%.3f"/>
</dia:attribute>
%s%s
</dia:object>''' % (self.oid, start.x,start.y, end.x, end.y,
self._tinting(color), self._stroke_style()))
# register the renderer
dia.register_export ("Dia plain", "dia", StandardDiaRenderer())
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