[OSM-dev-fr] un petit coin sur le svn

[Nicolas Dumoulin]

Bonjour,

Est-ce que il y aurait un petit coin sur le svn, ou ailleurs pour publier un peu de python ?
C'est quelques fonctions pour mapnik que je me suis concocté pour alléger mes scripts de création de carte.

Pour info, voilà en brut (sans commentaires :-/ ) :

def addPGLayer(m, name, table, symbolizer, dbname="osm", projection="+proj=latlong +datum=WGS84"):
  addLayer(m, name, symbolizer, 
mapnik.PostGIS(host='localhost',port='5434',user='mapnik',password='mapnik',dbname=dbname,table=table), projection)
  
def addLayer(m, name, symbolizer, datasource, projection):
  if symbolizer:
    # création du style
    s = mapnik.Style()
    r = mapnik.Rule()
    r.symbols.extend(symbolizer)
    s.rules.append(r)
    m.append_style(name,s)
  # création de la couche
  layer = mapnik.Layer(name, projection)
  layer.datasource = datasource
  layer.styles.append(name)
  m.layers.append(layer)
  return layer

def addLinesLayer(m, name, table, color, width,opacity=None):
  return addPGLayer(m, name, table, [line(color,width,opacity)])

def addLinesLayerWithContour(m, name, table, color, width, contoursColor, contoursWidth):
  addPGLayer(m, name+"-contours", table, [line(contoursColor,width+contoursWidth)])
  addPGLayer(m, name, table, [line(color,width)])

def line(color,width,opacity=None):
  stk = mapnik.Stroke()
  stk.color=mapnik.Color(color)
  stk.width=width
  stk.line_join = stk.line_join.ROUND_JOIN
  stk.line_cap = stk.line_cap.ROUND_CAP
  if opacity: stk.opacity = opacity
  ls = mapnik.LineSymbolizer(stk)
  return ls

def dashedLine(color,width,*dashArray):
  # create new stroke, otherwise dashes are not taken in account
  stk = mapnik.Stroke()
  stk.color=mapnik.Color(color)
  stk.width=width
  stk.line_join = stk.line_join.BEVEL_JOIN
  for dash in dashArray:
    stk.add_dash(dash[0],dash[1])
  ls = mapnik.LineSymbolizer(stk)
  return ls

def polygon(color,opacity=None):
  ps = mapnik.PolygonSymbolizer(mapnik.Color(color))
  if opacity: ps.fill_opacity = opacity
  return ps

def text(size, color, haloFill, haloRadius, placement=mapnik.label_placement.POINT_PLACEMENT, bold=False):
  font = 'DejaVu Sans Book'
  if bold: font = 'DejaVu Sans Bold'
  ts = mapnik.TextSymbolizer('name',font, size, mapnik.Color(color))
  ts.halo_fill = mapnik.Color(haloFill)
  ts.halo_radius = haloRadius
  ts.label_placement = placement
  ts.wrap_width=120
  ts.allow_overlap=True
  ts.force_odd_labels=True
  ts.max_char_angle_delta=40.0
  ts.minimum_distance=130.0
  return ts
  

def cairoDraw(maps, map_uri, imgx, imgy):
  # With cairo
  import cairo, math
  surface = cairo.ImageSurface (cairo.FORMAT_ARGB32, imgx, imgy)
  ctx = cairo.Context(surface)
  for m in maps:
    mapnik.render(m, ctx)
  surface.write_to_png (map_uri)

-- 
Nicolas Dumoulin
http://wiki.openstreetmap.org/wiki/User:NicolasDumoulin