fs_multiline = ds.getFeatureSource("diaglines_multiline");
bounds = new ReferencedEnvelope(0, 10, 0, 10, DefaultGeographicCRS.WGS84);
renderer = new StreamingRenderer();
Map rendererParams = new HashMap();
LabelCacheImpl labelCache = new LabelCacheImpl();
rendererParams.put(StreamingRenderer.LABEL_CACHE_KEY, labelCache);
renderer.setRendererHints(rendererParams);
renderer.setJava2DHints(new RenderingHints(KEY_ANTIALIASING, VALUE_ANTIALIAS_ON));
FontCache.getDefaultInstance().registerFont(
Font.createFont(Font.TRUETYPE_FONT, TestData.getResource(this, "Vera.ttf")