Broken / Missing line edges
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Broken / Missing line edges
by Adnan Khan-3
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Hi Guys,
I'm testing Mapnik 0.6.0 & 0.5.1 (on Windows platform) and came across a very strange scenario. I have noticed Mapnik sometimes cuts / slashes styled road edges (styled lines in my case) around the tile corners i.e. roads finish abruptly. I know there have been some problems with missing labels,symbols,etc but I cannot find anything on missing / cut styled edges. Is there a fix / workaround for this problem? I have attached a png image highlighting the problem (with vector data shown on top of created rasters) and the python script used to generate tiles. The original shp file used to create samples has been uploaded since 700kb exceeds max allowed limit here, download link given below. http://pzh6gq.blu.livefilestore.com/y1pjcNP-HcqKN87z7hxUSwkHhozm_aC61po5hlFe9k8gChYhFVhj71M4Xwnq2wdpfoHIoNmJJw8tSVdBmYSKSVRhzOj__MJXaf5/sample.zip?download I would greatly appreciate any help in this matter. Thanks -- Adnan Khan ''' Created on 20 May 2009 Creates samples images from Mapnik. Images are created in the same dir as base shp file for roads. ''' from mapnik import * import os shp_file_loc = 'C:\\sample\\sample' output_dir = os.path.dirname(shp_file_loc) label_field = 'STREET_NAM' tile_size = 800 m = Map(tile_size,tile_size,"+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +datum=OSGB36 +units=m +no_defs") m.background = Color(240,240,240) start_x,start_y,end_x,end_y = 475000,260000,477000,262000 def createSHPLayer(file_path,lyr_name,style_names): lyr = Layer(lyr_name) lyr.datasource = Shapefile(file=file_path,encoding='latin1') for style_name in style_names: lyr.styles.append(style_name) return lyr def createLineStyle(style_name,width=7,rgb='orange'): s = Style() stk = Stroke() stk.width = width stk.color = Color(rgb) stk.line_cap = line_cap.ROUND_CAP r = Rule() r.symbols.append(LineSymbolizer(stk)) s.rules.append(r) m.append_style(style_name,s) return s def createLineText(style_name,field_name='stnm_base',font_size=10,rgb='black'): s2 = Style() r2 = Rule() t2 = TextSymbolizer(field_name,'DejaVu Sans Book',font_size,Color(rgb)) t2.label_placement = label_placement.LINE_PLACEMENT t2.halo_radius = 1 t2.halo_fill = Color('yellow') t2.allow_overlap = True t2.avoid_edges = True t2.max_char_angle_delta = 20 t2.minimum_distance = 50 t2.label_spacing = 100 t2.avoid_edges = True r2.symbols.append(t2) s2.rules.append(r2) m.append_style(style_name,s2) return s2 # Create styles createLineStyle('road fill',4.5) createLineStyle('road border', 5.5, 'gray') createLineText('road labels',label_field) # Create source and append styles to it road_layer = createSHPLayer(shp_file_loc, 'roads', ['road border','road fill','road labels']) m.layers.append(road_layer) for i in range(2): m.zoom_to_box(Envelope(start_x,start_y,end_x,end_y)) render_to_file(m,'%s\\%s.png' % (output_dir,i),'png256') scale = m.scale() extent= m.envelope() upper_left_x_center = extent.minx+(scale/2) upper_left_y_center = extent.maxy+(scale/2) x_rotation = 0.0 y_rotation = 0.0 wld_string = '%f\n%s\n%s\n-%f\n%f\n%f\n' % (scale,y_rotation,x_rotation,scale,upper_left_x_center,upper_left_y_center) wld_file = open('%s\\%s.wld' % (output_dir,i), 'w') wld_file.write(wld_string) start_y = end_y end_y += tile_size _______________________________________________ Mapnik-users mailing list Mapnik-users@... https://lists.berlios.de/mailman/listinfo/mapnik-users |
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Re: Broken / Missing line edges
by Dane Springmeyer
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