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.
But this map is Georeferenced to WGS84 lat lon.
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] 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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