/**
* Using the viewport bounds and combined wms layer extents, determines an appropriate bounding
* box by projecting the viewport into the request CRS, intersecting the bounds, and returning the
* result.
*
* @param wmsLayers all adjacent wms layers we are requesting
* @param viewport map editor bounds and crs
* @param requestCRS coordinate reference system supported by the server
* @return the bbox to ask the server for
* @throws MismatchedDimensionException
* @throws TransformException
* @throws FactoryException
*/
public static ReferencedEnvelope calculateRequestBBox(
List<Layer> wmsLayers,
ReferencedEnvelope viewport,
CoordinateReferenceSystem requestCRS,
String version)
throws MismatchedDimensionException, TransformException, FactoryException {
/* The bounds of all wms layers on this server combined */
ReferencedEnvelope layersBBox = getLayersBoundingBox(requestCRS, wmsLayers, version);
if (isEnvelopeNull(layersBBox)) {
// the wms server has no bounds
WMSPlugin.log("Zero width/height envelope: wmsLayers = " + layersBBox); // $NON-NLS-1$
layersBBox = null;
// alternatively, we could impose a reprojected -180,180,-90,90
}
/* The viewport bounds projected to the request crs */
ReferencedEnvelope reprojectedViewportBBox = viewport.transform(requestCRS, true);
if (isEnvelopeNull(reprojectedViewportBBox)) {
// viewport couldn't be reprojected
WMSPlugin.log(
"Zero width/height envelope: reprojected viewport from "
+ viewport //$NON-NLS-1$
+ " to "
+ requestCRS
+ " returned "
+ reprojectedViewportBBox); //$NON-NLS-1$ //$NON-NLS-2$
}
// alternative for better accuracy: new ReferencedEnvelope(JTS.transform(viewport, null,
// CRS.findMathTransform(viewportCRS, crs, true), 4), crs);
/* The intersection of the viewport and the combined wms layers */
Envelope interestBBox;
if (layersBBox == null) {
interestBBox = reprojectedViewportBBox;
} else {
interestBBox = reprojectedViewportBBox.intersection(layersBBox);
}
if (isEnvelopeNull(interestBBox)) {
// outside of bounds, do not draw
WMSPlugin.trace(
"Bounds of the data are outside the bounds of the viewscreen."); //$NON-NLS-1$
return NILL_BOX;
}
/* The bounds of the request we are going to make */
ReferencedEnvelope requestBBox = new ReferencedEnvelope(interestBBox, requestCRS);
return requestBBox;
}
/**
* Determines the dimensions of the image to request, usually 1:1 to display, but sometimes more
* (too fuzzy) or less (image too large) when reprojecting.
*
* @param maxDimensions TODO
* @param viewport
* @param request
* @param context
* @return
* @throws RenderException
*/
public static Dimension calculateImageDimensions(
Dimension displaySize, Dimension maxDimensions, Envelope viewport, Envelope request)
throws RenderException {
double xScale = request.getWidth() / viewport.getWidth();
double yScale = request.getHeight() / viewport.getHeight();
// TODO: adjust height and width when we are reprojecting to make things less fuzzy
int width = (int) (xScale * displaySize.getWidth());
int height = (int) (yScale * displaySize.getHeight());
// ensure we don't exceed the dimensions the server will allow
int maxWidth = (int) maxDimensions.getWidth();
if ((maxWidth > 0) && (width > maxWidth)) {
width = maxWidth;
}
int maxHeight = (int) maxDimensions.getHeight();
if ((maxHeight > 0) && (height > maxHeight)) {
height = maxHeight;
}
WMSPlugin.trace(
"WMS request image dimensions: " + width + ", " + height); // $NON-NLS-1$ //$NON-NLS-2$
return new Dimension(width, height);
}
public synchronized void render(
Graphics2D destination, ReferencedEnvelope bounds, IProgressMonitor monitor)
throws RenderException {
int endLayerStatus = ILayer.DONE;
try {
if (bounds == null || bounds.isNull()) {
bounds = getContext().getImageBounds();
}
if (monitor.isCanceled()) return;
getContext().setStatus(ILayer.WAIT);
WebMapServer wms = getWMS();
GetMapRequest request = wms.createGetMapRequest();
// put in default exception format we understand as a client
// (if suppoted by the server)
WMSCapabilities capabilities = wms.getCapabilities();
if (capabilities
.getRequest()
.getGetMap()
.getFormats()
.contains(GetMapRequest.EXCEPTION_XML)) {
request.setExceptions(GetMapRequest.EXCEPTION_XML);
}
setImageFormat(wms, request);
if (monitor.isCanceled()) return;
double currScale = getContext().getViewportModel().getScaleDenominator();
List<ILayer> layers = getLayers();
for (int i = layers.size() - 1; i >= 0; i--) {
ILayer ilayer = layers.get(i);
Layer layer;
double minScale = 0;
double maxScale = Double.MAX_VALUE;
layer = ilayer.getResource(org.geotools.data.ows.Layer.class, null);
// check if there are min/max scale rules
StyleBlackboard sb = (StyleBlackboard) ilayer.getStyleBlackboard();
Style style = (Style) sb.lookup(Style.class);
if (style != null) {
Rule rule = style.getFeatureTypeStyles()[0].getRules()[0];
minScale = rule.getMinScaleDenominator();
maxScale = rule.getMaxScaleDenominator();
}
if (currScale >= minScale && currScale <= maxScale) {
// check for a wms style
StyleImpl wmsStyle =
(StyleImpl) ilayer.getStyleBlackboard().get(WMSStyleContent.WMSSTYLE);
if (wmsStyle != null) {
request.addLayer(layer, wmsStyle);
} else {
request.addLayer(layer);
}
}
}
if (monitor.isCanceled()) return;
List<Layer> wmsLayers = getWMSLayers();
if (wmsLayers == null || wmsLayers.isEmpty()) {
endLayerStatus = ILayer.WARNING;
return;
}
// figure out request CRS
String requestCRScode = findRequestCRS(wmsLayers, getViewportCRS(), getContext().getMap());
// TODO: make findRequestCRS more efficient (we are running CRS.decode at *least* twice)
CoordinateReferenceSystem requestCRS = CRS.decode(requestCRScode);
// figure out viewport
// ReferencedEnvelope viewport;
// Envelope viewportBBox = getViewportBBox();
// CoordinateReferenceSystem viewportCRS = getViewportCRS();
// if (viewportBBox == null) {
// // change viewport to world
// viewportBBox = new Envelope(-180, 180, -90, 90);
// if (!DefaultGeographicCRS.WGS84.equals(viewportCRS)) { // reproject
// viewport = new ReferencedEnvelope(viewportBBox,
// DefaultGeographicCRS.WGS84);
// viewportBBox = viewport.transform(viewportCRS, true);
// }
// }
ReferencedEnvelope requestBBox = null;
Envelope backprojectedBBox = null; // request bbox projected to the viewport crs
// viewport = new ReferencedEnvelope(viewportBBox, viewportCRS);
// requestBBox = calculateRequestBBox(wmsLayers, viewport, requestCRS);
requestBBox = calculateRequestBBox(wmsLayers, bounds, requestCRS, capabilities.getVersion());
// check that a request is needed (not out of a bounds, invalid, etc)
if (requestBBox == NILL_BOX) {
endLayerStatus = ILayer.WARNING;
return;
}
assert requestBBox.getCoordinateReferenceSystem().equals(requestCRS);
if (requestBBox.getCoordinateReferenceSystem().equals(getViewportCRS())) {
backprojectedBBox = (Envelope) requestBBox;
} else {
backprojectedBBox = (Envelope) requestBBox.transform(getViewportCRS(), true);
}
if (WMSPlugin.isDebugging(Trace.RENDER)) {
WMSPlugin.trace("Viewport CRS: " + getViewportCRS().getName()); // $NON-NLS-1$
WMSPlugin.trace("Request CRS: " + requestCRS.getName()); // $NON-NLS-1$
WMSPlugin.trace("Context Image bounds: " + getContext().getImageBounds()); // $NON-NLS-1$
WMSPlugin.trace("Request BBox bounds: " + requestBBox); // $NON-NLS-1$
WMSPlugin.trace("Backprojected request bounds: " + backprojectedBBox); // $NON-NLS-1$
}
Service wmsService = capabilities.getService();
Dimension maxDimensions = new Dimension(wmsService.getMaxWidth(), wmsService.getMaxHeight());
// Dimension imageDimensions =
// calculateImageDimensions(getContext().getMapDisplay()
// .getDisplaySize(), maxDimensions, getViewportBBox(), backprojectedBBox);
Dimension imageDimensions =
calculateImageDimensions(
getContext().getImageSize(), maxDimensions, bounds, backprojectedBBox);
if (imageDimensions.height < 1 || imageDimensions.width < 1) {
endLayerStatus = ILayer.WARNING;
return;
}
request.setDimensions(
imageDimensions.width + "", imageDimensions.height + ""); // $NON-NLS-1$ //$NON-NLS-2$
// epsg could be under identifiers or authority.
Set<ReferenceIdentifier> identifiers = requestCRS.getIdentifiers();
String srs = identifiers.isEmpty() ? EPSG_4326 : identifiers.iterator().next().toString();
request.setSRS(srs); // EPSG_4326
request.setBBox(requestBBox);
// request.setBBox(requestBBox.getMinX() + "," + requestBBox.getMinY()+ "," +
// requestBBox.getMaxX()+ "," + requestBBox.getMaxY());
if (monitor.isCanceled()) return;
setFilter(wms, request);
// request.setProperty("DACS_ACS", null);
BufferedImage image = readImage(wms, request, monitor);
if (monitor.isCanceled()) return;
if (image == null) {
Exception e = new RuntimeException(Messages.BasicWMSRenderer2_unable_to_decode_image);
throw wrapException(e);
}
// backprojectedBBox or viewportBBox
renderGridCoverage(destination, backprojectedBBox, imageDimensions, requestBBox, image);
} catch (Exception e) {
if (e instanceof RenderException) throw (RenderException) e;
throw new RenderException(e);
} finally {
getContext().setStatus(endLayerStatus);
if (endLayerStatus == ILayer.DONE) {
// clear the status message (rendering was successful)
getContext().setStatusMessage(null);
}
}
}