Examples with ShapeWriter com.vividsolutions.jts.awt.ShapeWriter used on opensource projects

Example 1 with ShapeWriter

use of com.vividsolutions.jts.awt.ShapeWriter in project OpenTripPlanner by opentripplanner.

the class EdgeVertexTileRenderer method renderTile.

@Override
public void renderTile(TileRenderContext context) {
    float lineWidth = (float) (1.0f + 3.0f / Math.sqrt(context.metersPerPixel));
    // Grow a bit the envelope to prevent rendering glitches between tiles
    Envelope bboxWithMargins = context.expandPixels(lineWidth * 2.0, lineWidth * 2.0);
    Collection<Vertex> vertices = context.graph.streetIndex.getVerticesForEnvelope(bboxWithMargins);
    Collection<Edge> edges = context.graph.streetIndex.getEdgesForEnvelope(bboxWithMargins);
    Set<Edge> edgesSet = new HashSet<>(edges);
    /*
         * Some edges do not have geometry and thus do not get spatial-indexed. Add
         * outgoing/incoming edges of all vertices. This is not perfect, as if the edge cross a tile
         * it will not be rendered on it.
         */
    for (Vertex vertex : vertices) {
        edgesSet.addAll(vertex.getIncoming());
        edgesSet.addAll(vertex.getOutgoing());
    }
    // Note: we do not use the transform inside the shapeWriter, but do it ourselves
    // since it's easier for the offset to work in pixel size.
    ShapeWriter shapeWriter = new ShapeWriter(new IdentityPointTransformation(), new PointShapeFactory.Point());
    GeometryFactory geomFactory = new GeometryFactory();
    Stroke stroke = new BasicStroke(lineWidth * 1.4f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL);
    Stroke halfStroke = new BasicStroke(lineWidth * 0.6f + 1.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL);
    Stroke halfDashedStroke = new BasicStroke(lineWidth * 0.6f + 1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 1.0f, new float[] { 4 * lineWidth, lineWidth }, 2 * lineWidth);
    Stroke arrowStroke = new ShapeStroke(new Polygon(new int[] { 0, 0, 30 }, new int[] { 0, 20, 10 }, 3), lineWidth / 2, 5.0f * lineWidth, 2.5f * lineWidth);
    BasicStroke thinStroke = new BasicStroke(1.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL);
    Font font = new Font(Font.SANS_SERIF, Font.PLAIN, Math.round(lineWidth));
    Font largeFont = new Font(Font.SANS_SERIF, Font.PLAIN, Math.round(lineWidth * 1.5f));
    FontMetrics largeFontMetrics = context.graphics.getFontMetrics(largeFont);
    context.graphics.setFont(largeFont);
    context.graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    context.graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
    BufferParameters bufParams = new BufferParameters();
    bufParams.setSingleSided(true);
    bufParams.setJoinStyle(BufferParameters.JOIN_BEVEL);
    // Render all edges
    EdgeVisualAttributes evAttrs = new EdgeVisualAttributes();
    for (Edge edge : edgesSet) {
        evAttrs.color = null;
        evAttrs.label = null;
        Geometry edgeGeom = edge.getGeometry();
        boolean hasGeom = true;
        if (edgeGeom == null) {
            Coordinate[] coordinates = new Coordinate[] { edge.getFromVertex().getCoordinate(), edge.getToVertex().getCoordinate() };
            edgeGeom = GeometryUtils.getGeometryFactory().createLineString(coordinates);
            hasGeom = false;
        }
        boolean render = evRenderer.renderEdge(edge, evAttrs);
        if (!render)
            continue;
        Geometry midLineGeom = context.transform.transform(edgeGeom);
        OffsetCurveBuilder offsetBuilder = new OffsetCurveBuilder(new PrecisionModel(), bufParams);
        Coordinate[] coords = offsetBuilder.getOffsetCurve(midLineGeom.getCoordinates(), lineWidth * 0.4);
        if (coords.length < 2)
            // Can happen for very small edges (<1mm)
            continue;
        LineString offsetLine = geomFactory.createLineString(coords);
        Shape midLineShape = shapeWriter.toShape(midLineGeom);
        Shape offsetShape = shapeWriter.toShape(offsetLine);
        context.graphics.setStroke(hasGeom ? halfStroke : halfDashedStroke);
        context.graphics.setColor(evAttrs.color);
        context.graphics.draw(offsetShape);
        if (lineWidth > 6.0f) {
            context.graphics.setColor(Color.WHITE);
            context.graphics.setStroke(arrowStroke);
            context.graphics.draw(offsetShape);
        }
        if (lineWidth > 4.0f) {
            context.graphics.setColor(Color.BLACK);
            context.graphics.setStroke(thinStroke);
            context.graphics.draw(midLineShape);
        }
        if (evAttrs.label != null && lineWidth > 8.0f) {
            context.graphics.setColor(Color.BLACK);
            context.graphics.setStroke(new TextStroke("    " + evAttrs.label + "                              ", font, false, true));
            context.graphics.draw(offsetShape);
        }
    }
    // Render all vertices
    VertexVisualAttributes vvAttrs = new VertexVisualAttributes();
    for (Vertex vertex : vertices) {
        vvAttrs.color = null;
        vvAttrs.label = null;
        Point point = geomFactory.createPoint(new Coordinate(vertex.getLon(), vertex.getLat()));
        boolean render = evRenderer.renderVertex(vertex, vvAttrs);
        if (!render)
            continue;
        Point tilePoint = (Point) context.transform.transform(point);
        Shape shape = shapeWriter.toShape(tilePoint);
        context.graphics.setColor(vvAttrs.color);
        context.graphics.setStroke(stroke);
        context.graphics.draw(shape);
        if (vvAttrs.label != null && lineWidth > 6.0f && context.bbox.contains(point.getCoordinate())) {
            context.graphics.setColor(Color.BLACK);
            int labelWidth = largeFontMetrics.stringWidth(vvAttrs.label);
            /*
                 * Poor man's solution: stay on the tile if possible. Otherwise the renderer would
                 * need to expand the envelope by an unbounded amount (max label size).
                 */
            double x = tilePoint.getX();
            if (x + labelWidth > context.tileWidth)
                x -= labelWidth;
            context.graphics.drawString(vvAttrs.label, (float) x, (float) tilePoint.getY());
        }
    }
}