I think you are doing it correctly; the anchorpoint is just that ... the point
at which the text starts to render.
You may wish to play with the vertical text alignment; I am used to text
staring to render on the font baseline (ie at the bottom of the "O") which
would result in the "O" appearing higher then you may assume?
Jody
On 23/04/2010, at 7:29 PM, Simon Hartley wrote:
> In the code below, the 'O' character as far as I can work out should be
> rendered in the middle of the rendered square.
> This should be true since the AnchorPoint is defined as 0.5, 0.5.
> However this isn't what actually happens. The 'O' gets rendered higher than
> this.
> Is this a bug or is there something I'm doing wrong or misunderstanding?
>
> Simon
>
> public static void main(String[] args) throws IOException {
> MapLayer layer = new DefaultMapLayer(createPointFeature(),
> createPointStyle());
> MapContext map = new DefaultMapContext(new MapLayer[] {layer},
> DefaultGeographicCRS.WGS84);
> map.setAreaOfInterest(new ReferencedEnvelope(-10, 10, -10, 10,
> DefaultGeographicCRS.WGS84));
>
> GTRenderer draw = new StreamingRenderer();
> draw.setContext(map);
>
> Rectangle paintArea = new Rectangle(60, 60);
>
> BufferedImage bi = new BufferedImage(paintArea.width,
> paintArea.height, BufferedImage.TYPE_INT_ARGB);
> Graphics2D graphics = bi.createGraphics();
> graphics.setColor(Color.WHITE);
> graphics.fillRect(0, 0, bi.getWidth(), bi.getHeight());
> draw.paint(graphics, paintArea, map.getAreaOfInterest());
> graphics.dispose();
>
> ImageIO.write(bi, "png", new File("", "output.png"));
> }
>
> private static FeatureCollection<SimpleFeatureType, SimpleFeature>
> createPointFeature() {
> SimpleFeatureTypeBuilder typeBuilder = new
> SimpleFeatureTypeBuilder();
> typeBuilder.setName("pointlabel");
> typeBuilder.add("point", Point.class,
> DefaultGeographicCRS.WGS84);
> typeBuilder.add("label", String.class);
> SimpleFeatureType featureType = typeBuilder.buildFeatureType();
>
> double longitude = 0.0;
> double latitude = 0.0;
> Point point = JTSFactoryFinder.getGeometryFactory(null)
> .createPoint( new Coordinate(longitude,
> latitude) );
>
> SimpleFeatureBuilder featureBuilder = new
> SimpleFeatureBuilder(featureType);
> featureBuilder.add(point);
> featureBuilder.add("O");
> SimpleFeature feature = featureBuilder.buildFeature(null);
>
> return DataUtilities.collection(feature);
> }
>
> private static Style createPointStyle() {
> StyleFactory sf =
> CommonFactoryFinder.getStyleFactory(GeoTools.getDefaultHints());
> FilterFactory ff =
> CommonFactoryFinder.getFilterFactory(GeoTools.getDefaultHints());
>
> Font font = sf.getDefaultFont();
> font.setSize(ff.literal(40.0));
>
> Displacement disp = sf.createDisplacement(ff.literal(0),
> ff.literal(0));
> AnchorPoint anchor = sf.createAnchorPoint(ff.literal(0.5),
> ff.literal(0.5));
> LabelPlacement placement = sf.createPointPlacement(anchor,
> disp, ff.literal(0));
>
> TextSymbolizer sym = sf.createTextSymbolizer(
> sf.createFill(BLACK), new Font[]{font},
> null, ff.property("label"), placement, null);
>
> return SLD.wrapSymbolizers(sym);
> }
>
>
>
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