Dear Jody Garnett,
Thanks for the reply.., I greatly appreciate it....
Answer to your questions:
1) Yes shapefiles have .prj files.
2) And shape files are in "WGS84/ UTM Zone 43N"
3) In UDIG these shapefiles are coming properly,for the default(WGS84) as
well as selected "WGS84/UTM Zone 43N" CRS.
Now I started using the CRS in my program, but still I am getting the streched
map image.....
Following is the code I am using for this process:......
String code = "32643";
CoordinateReferenceSystem crs = FactoryFinder.getCRSAuthorityFactory(
"EPSG", null).createCoordinateReferenceSystem(code);
this.mapContext = new DefaultMapContext(crs);
Envelope env = this.mapContext.getAreaOfInterest();
//map.addlayers.....adding all the shapefiles.
//Rendering....
BufferedImage bufferedImage = null;
bufferedImage = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = (Graphics2D)bufferedImage.getGraphics();
graphics2D.setRenderingHints(new
RenderingHints(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_SPEED));
graphics2D.setColor(Color.WHITE);
graphics2D.fillRect(0, 0, width, height);
RenderingHints hints = new
RenderingHints(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON );
streamingRenderer.setJava2DHints(hints);
//we already do everything that the optimized data loading does...
//if we set it to true then it does it all twice...
Map rendererParams = new HashMap();
rendererParams.put("optimizedDataLoadingEnabled",new Boolean(true));
streamingRenderer.setRendererHints(rendererParams);
try
{
streamingRenderer.paint(graphics2D, new Rectangle(width, height),
env);
} catch(Exception ex) {
ex.printStackTrace();
}
if (graphics2D!=null) graphics2D.dispose();
ServletOutputStream sos = res.getOutputStream();
ImageIO.write(bufferedImage,"jpg",sos);
//image is thrown out... here.
Can you please suggest me what is that I am missing in my program......??
Best Regards
Govardhan
----- Original Message -----
From: "Jody Garnett" <[EMAIL PROTECTED]>
To: "Govardhan" <[EMAIL PROTECTED]>
Cc: <[email protected]>; <[EMAIL PROTECTED]>
Sent: Wednesday, December 20, 2006 10:18 AM
Subject: Re: My map is looking streched... Please help me
> Evening Mr Govardhan ...
>
> I think you are going to have to use the CRS that matches your data,
> does your data have prj files? You may want to try out your shapefiles
> with uDig just to confirm they are working correctly.
>
> Cheers,
> Jody
>> Dear Sir/Madam,
>> I am having problem in bringing up my Georeferenced map on the screen.
>> I am using DefaultMapContext() to create map, and not using any CRS.
>>
>> I have attached the map image, please help me how to resolve this.
>>
>> I am using the following code to create the map,
>>
>> private void renderMap(MapHelper mapHelper, HttpServletRequest req,
>> HttpServletResponse res)
>> throws ServletException, IOException {
>>
>> StreamingRenderer streamingRenderer = new StreamingRenderer();
>> MapContext mapContext = mapHelper.getMapContext();
>> streamingRenderer.setContext(mapContext);
>>
>> System.out.println("inside rendermap");
>>
>> int width = 0;
>> int height = 0;
>>
>> if(req.getParameter("mapWidth") != null) {
>> width = Integer.parseInt(req.getParameter("mapWidth"));
>> mapHelper.setImageWidth(width);
>> }
>>
>> if(req.getParameter("mapHeight") != null) {
>> height = Integer.parseInt(req.getParameter("mapHeight"));
>> mapHelper.setImageHeight(height);
>> }
>>
>> System.out.println("imageWidth=" + width + ", imageHeight=" +
>> height);
>>
>> BufferedImage bufferedImage = null;
>> bufferedImage = new BufferedImage(width, height,
>> BufferedImage.TYPE_INT_RGB);
>> Graphics2D graphics2D = (Graphics2D)bufferedImage.getGraphics();
>> graphics2D.setRenderingHints(new
>> RenderingHints(RenderingHints.KEY_RENDERING,
>> RenderingHints.VALUE_RENDER_SPEED));
>> graphics2D.setColor(Color.WHITE);
>> graphics2D.fillRect(0, 0, width, height);
>> RenderingHints hints = new
>> RenderingHints(RenderingHints.KEY_ANTIALIASING,
>> RenderingHints.VALUE_ANTIALIAS_ON );
>> streamingRenderer.setJava2DHints(hints);
>>
>> //we already do everything that the optimized data loading
>> does...
>> //if we set it to true then it does it all twice...
>> Map rendererParams = new HashMap();
>> rendererParams.put("optimizedDataLoadingEnabled",new
>> Boolean(true));
>> Envelope env = mapHelper.getEnvelope();
>>
>>
>> streamingRenderer.setRendererHints(rendererParams);
>> try
>> {
>> System.out.println("long=" + env.centre().x + ", lat=" +
>> env.centre().y);
>> private void renderMap(MapHelper mapHelper, HttpServletRequest req,
>> HttpServletResponse res)
>> throws ServletException, IOException {
>>
>> StreamingRenderer streamingRenderer = new StreamingRenderer();
>> MapContext mapContext = mapHelper.getMapContext();
>> streamingRenderer.setContext(mapContext);
>>
>> System.out.println("inside rendermap");
>>
>> int width = 0;
>> int height = 0;
>>
>> if(req.getParameter("mapWidth") != null) {
>> width = Integer.parseInt(req.getParameter("mapWidth"));
>> mapHelper.setImageWidth(width);
>> }
>>
>> if(req.getParameter("mapHeight") != null) {
>> height = Integer.parseInt(req.getParameter("mapHeight"));
>> mapHelper.setImageHeight(height);
>> }
>>
>> System.out.println("imageWidth=" + width + ", imageHeight=" +
>> height);
>>
>> BufferedImage bufferedImage = null;
>> bufferedImage = new BufferedImage(width, height,
>> BufferedImage.TYPE_INT_RGB);
>> Graphics2D graphics2D = (Graphics2D)bufferedImage.getGraphics();
>> graphics2D.setRenderingHints(new
>> RenderingHints(RenderingHints.KEY_RENDERING,
>> RenderingHints.VALUE_RENDER_SPEED));
>> graphics2D.setColor(Color.WHITE);
>> graphics2D.fillRect(0, 0, width, height);
>> RenderingHints hints = new
>> RenderingHints(RenderingHints.KEY_ANTIALIASING,
>> RenderingHints.VALUE_ANTIALIAS_ON );
>> streamingRenderer.setJava2DHints(hints);
>>
>> //we already do everything that the optimized data loading
>> does...
>> //if we set it to true then it does it all twice...
>> Map rendererParams = new HashMap();
>> rendererParams.put("optimizedDataLoadingEnabled",new
>> Boolean(true));
>> Envelope env = mapHelper.getEnvelope();
>>
>>
>> streamingRenderer.setRendererHints(rendererParams);
>> try
>> {
>> streamingRenderer.paint(graphics2D, new Rectangle(width,
>> height), env);
>>
>> } catch(Exception ex) {
>> ex.printStackTrace();
>> }
>>
>> if (graphics2D!=null) graphics2D.dispose();
>>
>> ServletOutputStream sos = res.getOutputStream();
>> ImageIO.write(bufferedImage,"jpg",sos);
>> sos.close();
>>
>> } } catch(Exception ex) {
>> ex.printStackTrace();
>> }
>>
>> if (graphics2D!=null) graphics2D.dispose();
>>
>> ServletOutputStream sos = res.getOutputStream();
>> ImageIO.write(bufferedImage,"jpg",sos);
>> sos.close();
>>
>> }
>>
>>
>> private MapHelper( ServletContext servletContext , HttpSession
>> httpSession) throws IOException{
>>
>> URL shapeURL1 =
>> servletContext.getResource("/WEB-INF/data/bangalore2/District_Border_region.shp");
>> URL sldURL1 =
>> servletContext.getResource("/WEB-INF/data/bangalore2/District_Border_region.sld");
>>
>>
>> loadContext(shapeURL1, sldURL1, "District_Border_region");
>>
>> URL shapeURL2 =
>> servletContext.getResource("/WEB-INF/data/bangalore2/District_Headquarter_font_point.shp");
>> URL sldURL2 =
>> servletContext.getResource("/WEB-INF/data/bangalore2/District_Headquarter_font_point.sld");
>>
>>
>> loadContext(shapeURL2, sldURL2, "District_Headquarter_font_point");
>>
>> URL shapeURL3 =
>> servletContext.getResource("/WEB-INF/data/bangalore2/Major_Road_polyline.shp");
>> URL sldURL3 =
>> servletContext.getResource("/WEB-INF/data/bangalore2/Major_Road_polyline.sld");
>>
>>
>> loadContext(shapeURL3, sldURL3, "Major_Road_polyline");
>>
>> URL shapeURL4 =
>> servletContext.getResource("/WEB-INF/data/bangalore2/National_Highway_polyline.shp");
>> URL sldURL4 =
>> servletContext.getResource("/WEB-INF/data/bangalore2/National_Highway_polyline.sld");
>>
>>
>> loadContext(shapeURL4, sldURL4, "National_Highway_polyline");
>>
>> URL shapeURL5 =
>> servletContext.getResource("/WEB-INF/data/bangalore2/State_Border_region.shp");
>> URL sldURL5 =
>> servletContext.getResource("/WEB-INF/data/bangalore2/State_Border_region.sld");
>>
>>
>> loadContext(shapeURL5, sldURL5, "State_Border_region");
>>
>> Envelope env = mapContext.getLayerBounds();
>> setEnvelope(env);
>> if (mapContext == null)
>> {
>> System.out.println("MapContext is not valid");
>> }
>>
>> }
>> /**
>> * Load the data from the specified shapefile and construct a
>> [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> Context context}
>> * with a default style.
>> *
>> * @param url The url of the shapefile to load.
>> * @return Context The data from the shape file.
>> * @throws IOException is a I/O error occured.
>> * @throws DataSource if an error occured while reading the data
>> source.
>> */
>> protected void loadContext(final URL url, final URL sld, String
>> layername) throws IOException, DataSourceException {
>>
>> // Load the file
>> if (url == null) {
>> throw new FileNotFoundException("Resource not found");
>> }
>> final DataStore store = new ShapefileDataStore(url);
>> final FeatureSource features =
>> store.getFeatureSource(store.getTypeNames()[0]);
>>
>> // Create the style
>> final Style style;
>> if(sld != null){
>> SLDParser styleReader = new
>> SLDParser(StyleFactoryFinder.createStyleFactory(), sld);
>> style = styleReader.readXML()[0];
>> }
>> else
>> {
>> final StyleBuilder builder = new StyleBuilder();
>>
>> Class geometryClass =
>> features.getSchema().getDefaultGeometry().getType();
>> if(LineString.class.isAssignableFrom(geometryClass) ||
>> MultiLineString.class.isAssignableFrom(geometryClass)) {
>> style =
>> builder.createStyle(builder.createLineSymbolizer());
>> } else if(Point.class.isAssignableFrom(geometryClass) ||
>> MultiPoint.class.isAssignableFrom(geometryClass)) {
>> style =
>> builder.createStyle(builder.createPointSymbolizer());
>> } else {
>> style =
>> builder.createStyle(builder.createPolygonSymbolizer(
>> Color.ORANGE, Color.BLACK, 1));
>> }
>> }
>>
>> // Create the context
>> MapLayer layer = new DefaultMapLayer(features, style);
>> layer.setTitle(layername);
>> mapContext.addLayer(layer);
>> }
>>
>>
>>
>>
>>
>> Best Regards
>> Govardhan
>>
>> ------------------------------------------------------------------------
>>
>-------------------------------------------------------------------------
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