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Re: [Geotools-gt2-users] My map is looking streched... Please help me
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From: Govardhan <gov...@co...> - 2006-12-20 12:35:57
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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.
=20
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 =3D "32643";
CoordinateReferenceSystem crs =3D =
FactoryFinder.getCRSAuthorityFactory(
"EPSG", null).createCoordinateReferenceSystem(code); =20
this.mapContext =3D new DefaultMapContext(crs);
Envelope env =3D this.mapContext.getAreaOfInterest();
//map.addlayers.....adding all the shapefiles.
//Rendering....=20
BufferedImage bufferedImage =3D null;
bufferedImage =3D new BufferedImage(width, height, =
BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D =3D =
(Graphics2D)bufferedImage.getGraphics();
graphics2D.setRenderingHints(new
RenderingHints(RenderingHints.KEY_RENDERING, =
RenderingHints.VALUE_RENDER_SPEED));
graphics2D.setColor(Color.WHITE);
graphics2D.fillRect(0, 0, width, height); =20
RenderingHints hints =3D 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 =3D 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!=3Dnull) graphics2D.dispose();
ServletOutputStream sos =3D res.getOutputStream();
ImageIO.write(bufferedImage,"jpg",sos);
=20
//image is thrown out... here.
Can you please suggest me what is that I am missing in my =
program......??
Best Regards
Govardhan
----- Original Message -----=20
From: "Jody Garnett" <jga...@re...>
To: "Govardhan" <gov...@co...>
Cc: <geo...@li...>; <gt...@mo...>
Sent: Wednesday, December 20, 2006 10:18 AM
Subject: Re: My map is looking streched... Please help me
> Evening Mr Govardhan ...
>=20
> I think you are going to have to use the CRS that matches your data,=20
> does your data have prj files? You may want to try out your shapefiles =
> with uDig just to confirm they are working correctly.
>=20
> 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.
>> =20
>> I have attached the map image, please help me how to resolve this.
>> =20
>> I am using the following code to create the map,
>> =20
>> private void renderMap(MapHelper mapHelper, HttpServletRequest req,=20
>> HttpServletResponse res)
>> throws ServletException, IOException {
>> =20
>> StreamingRenderer streamingRenderer =3D new =
StreamingRenderer();
>> MapContext mapContext =3D mapHelper.getMapContext();
>> streamingRenderer.setContext(mapContext);
>> =20
>> System.out.println("inside rendermap");
>> =20
>> int width =3D 0;
>> int height =3D 0;
>> =20
>> if(req.getParameter("mapWidth") !=3D null) {
>> width =3D Integer.parseInt(req.getParameter("mapWidth"));
>> mapHelper.setImageWidth(width);
>> }
>> =20
>> if(req.getParameter("mapHeight") !=3D null) {
>> height =3D Integer.parseInt(req.getParameter("mapHeight"));
>> mapHelper.setImageHeight(height);
>> }
>> =20
>> System.out.println("imageWidth=3D" + width + ", =
imageHeight=3D" +=20
>> height);
>> =20
>> BufferedImage bufferedImage =3D null;
>> bufferedImage =3D new BufferedImage(width, height,=20
>> BufferedImage.TYPE_INT_RGB);
>> Graphics2D graphics2D =3D =
(Graphics2D)bufferedImage.getGraphics();
>> graphics2D.setRenderingHints(new
>> RenderingHints(RenderingHints.KEY_RENDERING,=20
>> RenderingHints.VALUE_RENDER_SPEED));
>> graphics2D.setColor(Color.WHITE);
>> graphics2D.fillRect(0, 0, width, height); =20
>> RenderingHints hints =3D new=20
>> RenderingHints(RenderingHints.KEY_ANTIALIASING,
>> RenderingHints.VALUE_ANTIALIAS_ON );
>> streamingRenderer.setJava2DHints(hints);
>> =20
>> //we already do everything that the optimized data loading =20
>> does...
>> //if we set it to true then it does it all twice...
>> Map rendererParams =3D new HashMap();
>> rendererParams.put("optimizedDataLoadingEnabled",new=20
>> Boolean(true));
>> Envelope env =3D mapHelper.getEnvelope();
>> =20
>> =20
>> streamingRenderer.setRendererHints(rendererParams);
>> try
>> {
>> System.out.println("long=3D" + env.centre().x + ", lat=3D" + =
>> env.centre().y);
>> private void renderMap(MapHelper mapHelper, HttpServletRequest req,=20
>> HttpServletResponse res)
>> throws ServletException, IOException {
>> =20
>> StreamingRenderer streamingRenderer =3D new =
StreamingRenderer();
>> MapContext mapContext =3D mapHelper.getMapContext();
>> streamingRenderer.setContext(mapContext);
>> =20
>> System.out.println("inside rendermap");
>> =20
>> int width =3D 0;
>> int height =3D 0;
>> =20
>> if(req.getParameter("mapWidth") !=3D null) {
>> width =3D Integer.parseInt(req.getParameter("mapWidth"));
>> mapHelper.setImageWidth(width);
>> }
>> =20
>> if(req.getParameter("mapHeight") !=3D null) {
>> height =3D Integer.parseInt(req.getParameter("mapHeight"));
>> mapHelper.setImageHeight(height);
>> }
>> =20
>> System.out.println("imageWidth=3D" + width + ", =
imageHeight=3D" +=20
>> height);
>> =20
>> BufferedImage bufferedImage =3D null;
>> bufferedImage =3D new BufferedImage(width, height,=20
>> BufferedImage.TYPE_INT_RGB);
>> Graphics2D graphics2D =3D =
(Graphics2D)bufferedImage.getGraphics();
>> graphics2D.setRenderingHints(new
>> RenderingHints(RenderingHints.KEY_RENDERING,=20
>> RenderingHints.VALUE_RENDER_SPEED));
>> graphics2D.setColor(Color.WHITE);
>> graphics2D.fillRect(0, 0, width, height); =20
>> RenderingHints hints =3D new=20
>> RenderingHints(RenderingHints.KEY_ANTIALIASING,
>> RenderingHints.VALUE_ANTIALIAS_ON );
>> streamingRenderer.setJava2DHints(hints);
>> =20
>> //we already do everything that the optimized data loading =20
>> does...
>> //if we set it to true then it does it all twice...
>> Map rendererParams =3D new HashMap();
>> rendererParams.put("optimizedDataLoadingEnabled",new=20
>> Boolean(true));
>> Envelope env =3D mapHelper.getEnvelope();
>> =20
>> =20
>> streamingRenderer.setRendererHints(rendererParams);
>> try
>> {
>> streamingRenderer.paint(graphics2D, new Rectangle(width,=20
>> height), env);
>> =20
>> } catch(Exception ex) {
>> ex.printStackTrace();
>> }
>> =20
>> if (graphics2D!=3Dnull) graphics2D.dispose();
>> =20
>> ServletOutputStream sos =3D res.getOutputStream();
>> ImageIO.write(bufferedImage,"jpg",sos);
>> sos.close();
>> =20
>> } } catch(Exception ex) {
>> ex.printStackTrace();
>> }
>> =20
>> if (graphics2D!=3Dnull) graphics2D.dispose();
>> =20
>> ServletOutputStream sos =3D res.getOutputStream();
>> ImageIO.write(bufferedImage,"jpg",sos);
>> sos.close();
>> =20
>> }
>> =20
>> =20
>> private MapHelper( ServletContext servletContext , HttpSession=20
>> httpSession) throws IOException{
>> =20
>> URL shapeURL1 =3D=20
>> =
servletContext.getResource("/WEB-INF/data/bangalore2/District_Border_regi=
on.shp");
>> URL sldURL1 =3D=20
>> =
servletContext.getResource("/WEB-INF/data/bangalore2/District_Border_regi=
on.sld"); =20
>>
>> loadContext(shapeURL1, sldURL1, "District_Border_region");
>> =20
>> URL shapeURL2 =3D=20
>> =
servletContext.getResource("/WEB-INF/data/bangalore2/District_Headquarter=
_font_point.shp");
>> URL sldURL2 =3D=20
>> =
servletContext.getResource("/WEB-INF/data/bangalore2/District_Headquarter=
_font_point.sld"); =20
>>
>> loadContext(shapeURL2, sldURL2, =
"District_Headquarter_font_point");
>> =20
>> URL shapeURL3 =3D=20
>> =
servletContext.getResource("/WEB-INF/data/bangalore2/Major_Road_polyline.=
shp");
>> URL sldURL3 =3D=20
>> =
servletContext.getResource("/WEB-INF/data/bangalore2/Major_Road_polyline.=
sld"); =20
>>
>> loadContext(shapeURL3, sldURL3, "Major_Road_polyline");
>> =20
>> URL shapeURL4 =3D=20
>> =
servletContext.getResource("/WEB-INF/data/bangalore2/National_Highway_pol=
yline.shp");
>> URL sldURL4 =3D=20
>> =
servletContext.getResource("/WEB-INF/data/bangalore2/National_Highway_pol=
yline.sld"); =20
>>
>> loadContext(shapeURL4, sldURL4, "National_Highway_polyline");
>> =20
>> URL shapeURL5 =3D=20
>> =
servletContext.getResource("/WEB-INF/data/bangalore2/State_Border_region.=
shp");
>> URL sldURL5 =3D=20
>> =
servletContext.getResource("/WEB-INF/data/bangalore2/State_Border_region.=
sld"); =20
>>
>> loadContext(shapeURL5, sldURL5, "State_Border_region");
>> =20
>> Envelope env =3D mapContext.getLayerBounds();
>> setEnvelope(env);
>> if (mapContext =3D=3D null)
>> {
>> System.out.println("MapContext is not valid");
>> }
>> =20
>> }
>> /**
>> * Load the data from the specified shapefile and construct a=20
>> {@linkplain <mailto:%7B@linkplain> 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=20
>> source.
>> */
>> protected void loadContext(final URL url, final URL sld, String=20
>> layername) throws IOException, DataSourceException {
>> =20
>> // Load the file
>> if (url =3D=3D null) {
>> throw new FileNotFoundException("Resource not found");
>> }
>> final DataStore store =3D new ShapefileDataStore(url);
>> final FeatureSource features =3D=20
>> store.getFeatureSource(store.getTypeNames()[0]);
>> =20
>> // Create the style
>> final Style style;
>> if(sld !=3D null){
>> SLDParser styleReader =3D new=20
>> SLDParser(StyleFactoryFinder.createStyleFactory(), sld);
>> style =3D styleReader.readXML()[0];
>> }
>> else
>> {
>> final StyleBuilder builder =3D new StyleBuilder();
>> =20
>> Class geometryClass =3D=20
>> features.getSchema().getDefaultGeometry().getType();
>> if(LineString.class.isAssignableFrom(geometryClass) ||=20
>> MultiLineString.class.isAssignableFrom(geometryClass)) {
>> style =3D=20
>> builder.createStyle(builder.createLineSymbolizer());
>> } else if(Point.class.isAssignableFrom(geometryClass) ||=20
>> MultiPoint.class.isAssignableFrom(geometryClass)) {
>> style =3D=20
>> builder.createStyle(builder.createPointSymbolizer());
>> } else {
>> style =3D=20
>> builder.createStyle(builder.createPolygonSymbolizer(
>> Color.ORANGE, Color.BLACK, 1));
>> }
>> }
>> =20
>> // Create the context
>> MapLayer layer =3D new DefaultMapLayer(features, style);
>> layer.setTitle(layername);
>> mapContext.addLayer(layer);
>> }
>> =20
>> =20
>> =20
>> =20
>> =20
>> Best Regards
>> Govardhan
>>
>> =
------------------------------------------------------------------------
>>
> |