Examples of org.geotools.map.MapViewport

org.geotools.map.MapViewport
Represents the area of a map to be displayed, expressed in world coordinates and (optionally) screen (window, image) coordinates. A viewport is used to stage information for map rendering. While the viewport provides support for bounds and coordinate reference system out of the box it is expected that the user data support in {@code MapContent} will be used to record additional information such as elevation and time as required for rendering.
When both world and screen bounds are defined, the viewport calculates {@code AffineTransforms}to convert the coordinates of one bounds to those of the other. It can also optionally adjust the world bounds to maintain an identical aspect ratio with the screen bounds. Note however that aspect ratio adjustment should not be enabled when the viewport is used with a service such as WMS which mandates that specified screen and world bounds must be honoured exactly, regardless of the resulting aspect ratio differences.
The {@code AffineTransforms} can be retrieved with the methods {@linkplain #getScreenToWorld()} and {@linkplain #getWorldToScreen()}. The following rules apply to the return values of these methods:
- If screen area is not defined, {@code null} is returned.
- If screen area only is defined, the identity transform is returned.
- If both screen area and world extent are defined, calculated transforms are returned.
@author Jody Garnett @author Michael Bedward @since 2.7 @source $URL$

    ClientRasterLayerInfo rasterInfo = (ClientRasterLayerInfo) clientLayerInfo;
    RasterLayerRasterizingInfo extraInfo = (RasterLayerRasterizingInfo) rasterInfo
        .getWidgetInfo(RasterLayerRasterizingInfo.WIDGET_KEY);
    ReferencedEnvelope areaOfInterest = mapContext.getAreaOfInterest();
    RasterLayer layer = configurationService.getRasterLayer(clientLayerInfo.getServerLayerId());
    MapViewport port = mapContext.getViewport();
    double rasterScale = port.getScreenArea().getWidth() / port.getBounds().getWidth();
    List<RasterTile> tiles = rasterLayerService.getTiles(clientLayerInfo.getServerLayerId(),
        areaOfInterest.getCoordinateReferenceSystem(), areaOfInterest, rasterScale);
    RasterDirectLayer rasterLayer = new RasterDirectLayer(tiles, layer.getLayerInfo().getTileWidth(), layer
        .getLayerInfo().getTileHeight(), extraInfo.getCssStyle());
    rasterLayer.setTitle(clientLayerInfo.getLabel());

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                graphics.clearRect(paintArea.x, paintArea.y, paintArea.width, paintArea.height);
            }
            
            validBounds=getContext().worldBounds(paintArea);


            MapViewport mapViewport = new MapViewport( validBounds );
            map.setViewport( mapViewport);


            GTRenderer geotToolsRenderer = getRenderer();


            if (bounds != null && !bounds.isNull()) {

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        Graphics2D g = (Graphics2D) image.getGraphics();
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, width, height);


        MapContent mapContent = new MapContent();
        MapViewport viewport = mapContent.getViewport();
        viewport.setBounds(new ReferencedEnvelope(mapArea, DefaultGeographicCRS.WGS84));
        viewport.setScreenArea(new Rectangle(width, height));
        mapContent.addLayer(new FeatureLayer(featureSource, style));


        StreamingRenderer renderer = new StreamingRenderer();
        renderer.setRendererHints(renderingHints);
        renderer.setMapContent(mapContent);
        renderer.paint(g, viewport.getScreenArea(), viewport.getBounds());
        return image;
    }

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    }
    
    @Test
    public void testLineDoubleDash() throws Exception {
        StreamingRenderer renderer = setupLineMap("lineDoubleDash.sld");
        MapViewport viewport = renderer.getMapContent().getViewport();
        ReferencedEnvelope re = viewport.getBounds();
        ReferencedEnvelope shifted = new ReferencedEnvelope(re.getMinX() + 2, re.getMaxX() - 3, re.getMinY() + 2, re.getMaxY() - 3, re.getCoordinateReferenceSystem());
        viewport.setBounds(shifted);
        
        BufferedImage image = RendererBaseTest.showRender("Lines with double dash array (2 fts)", renderer, TIME, shifted);
        ImageAssert.assertEquals(file("doubleDash"), image, 10);
    }

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            RenderingExecutorEvent event = new RenderingExecutorEvent(this, id);
            listener.onRenderingStarted(event);
            
            // Clone the viewport and mark it as not editable to prevent
            // the temporary MapContents created below from changing it
            MapViewport vp = new MapViewport(mapContent.getViewport());
            vp.setEditable(false);
            
            for (RenderingOperands op : operands) {
                MapContent mc = new SingleLayerMapContent(op.getLayer());
                mc.setViewport(vp);
                op.getRenderer().setMapContent(mc);

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            }


            mapContent = newMapContent;


            if (mapContent != null) {
                MapViewport viewport = mapContent.getViewport();
                viewport.setMatchingAspectRatio(true);
                Rectangle rect = getVisibleRect();
                if (!rect.isEmpty()) {
                    viewport.setScreenArea(rect);
                }
                
                mapContent.addMapLayerListListener(this);
                mapContent.addMapBoundsListener(this);

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            if (layer instanceof ComponentListener) {
                addComponentListener((ComponentListener) layer);
            }


            setFullExtent();
            MapViewport viewport = mapContent.getViewport();
            if (viewport.getBounds().isEmpty()) {
                viewport.setBounds(fullExtent);
            }
            
        } finally {
            paramsLock.writeLock().unlock();
        }

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     * Force the output to be in WGS84
     * @param mc
     * @return
     */
    private WMSMapContent fixViewport(WMSMapContent mc) {
        MapViewport viewport = mc.getViewport();
        if(!CRS.equalsIgnoreMetadata(viewport.getCoordinateReferenceSystem(), DefaultGeographicCRS.WGS84)) {
            viewport.setCoordinateReferenceSystem(DefaultGeographicCRS.WGS84);
            GetMapRequest req = mc.getRequest();
            req.setSRS("EPSG:4326");
            req.setBbox(viewport.getBounds());
        }
        
        return mc;
    }

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