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- #!/usr/bin/env python
- # -*- coding: utf-8 -*-
- # Copyright (C) 2007 Søren Roug, European Environment Agency
- #
- # This is free software. You may redistribute it under the terms
- # of the Apache license and the GNU General Public License Version
- # 2 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- #
- # Contributor(s):
- #
- # This is an example of an OpenDocument Text.
- # We are going to draw the European flag. I chose this motive because
- # it has just the right complexity for an example. It contains 12 five-edge
- # stars in a circle on a blue background. The production specifications can
- # be found at http://europa.eu/abc/symbols/emblem/index_en.htm
- #
- # The stars are drawn with a vector-oriented "turtle" the way Seymour Papert's
- # LOGO language does.
- import math
- from odf.opendocument import OpenDocumentText
- from odf.style import Style, GraphicProperties, DrawingPageProperties
- from odf.text import P
- from odf.draw import G, Polygon, Rect
- class VectorSet:
- """ A class to simulate LOGO's turtle. The turtle starts a 0,0 pointing
- right along the x-axis, since we use the mathematical coordinate system.
- """
- orientation = 0 # Degrees
- x = 0.0
- y = 0.0
- polygon = []
- def forward(self, length):
- orirad = math.radians(self.orientation)
- self.x = self.x + length * math.cos(orirad)
- self.y = self.y + length * math.sin(orirad)
- def right(self, turn):
- self.orientation = (self.orientation + turn) % 360
- def left(self, turn):
- self.orientation = (self.orientation - turn) % 360
- def mark(self):
- self.polygon.append((self.x,self.y))
- def firstmark(self):
- self.polygon.append(self.polygon[0])
- def getpoints(self):
- """ Return the polygon points """
- strpairs = ["%.0f,%.0f" % item for item in self.polygon]
- return ' '.join(strpairs)
- def getviewbox(self):
- ''' The value of the viewBox attribute is a list of four numbers
- <min-x>, <min-y>, <width> and <height>'''
- xvals = [ item[0] for item in self.polygon]
- maxx = int(reduce(max,xvals)) + 1
- minx = int(reduce(min,xvals))
- yvals = [ item[1] for item in self.polygon]
- maxy = int(reduce(max,yvals)) + 1
- miny = int(reduce(min,yvals))
- return minx, miny, maxx-minx, maxy-miny
- # Create the document
- doc = OpenDocumentText()
- # The blue background style of the flag
- backgroundstyle = Style(family="graphic", name="blueback")
- backgroundstyle.addElement(GraphicProperties(fill="solid", fillcolor="#003399", stroke="none"))
- doc.automaticstyles.addElement(backgroundstyle)
- # The style for the stars
- starstyle = Style(family="graphic", name="starstyle")
- starstyle.addElement(GraphicProperties(fill="solid", fillcolor="#ffcc00", stroke="none"))
- doc.automaticstyles.addElement(starstyle)
- # Create a paragraph to contain the drawing
- drawpage = P()
- doc.text.addElement(drawpage)
- group=G()
- drawpage.addElement(group)
- turtle = VectorSet()
- # Draw the edges
- turtle.mark()
- for edge in [ 0,1,2,3,5 ]:
- turtle.forward(100)
- turtle.mark()
- turtle.right(144)
- turtle.forward(100)
- turtle.mark()
- turtle.left(72)
- turtle.firstmark()
- # Draw a rectangle containing the blue background
- group.addElement(Rect(height="120mm", width="180mm", x="0mm", y="0mm", stylename=backgroundstyle))
- viewbox = ' '.join(map(str,turtle.getviewbox()))
- points = turtle.getpoints()
- # Go around in a circle in twelve steps
- for deg in range(0,360,30):
- x = 83.3 + math.cos(math.radians(deg)) * 40
- y = 53.3 + math.sin(math.radians(deg)) * 40
- group.addElement(Polygon(points=points,
- stylename=starstyle, viewbox=viewbox, width="13.3mm", height="13.3mm", x="%0.2fmm" % x, y="%0.2fmm" % y))
- # Save the work
- doc.save("europeanflag", True)
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