private void render(final MapSurface surface, final List<Way> mapData) {
// Start checking osm from bottom layer.
for (int layer = -5; layer <= 5; layer++) {
// Process Rule by Rule
for (Rule rule = rules.root(); rule != null; rule = rule.next()) {
if (rule.getDraw() != null) {
renderPaths(surface, layer, rule, rule.getDraw(), mapData);
// FIXME: Text Rendering
// renderText(surface, layer, rule, rule.getDraw(), mapData);
}
}
}
}
private void renderPaths(
MapSurface surface, int layer, Rule rule, Draw draw, final List<Way> mapData) {
int paths = 0;
Draw d = draw;
surface.path.reset();
// Loop through ways for
for (Way way : mapData) {
// perform geometry culling. If an object is not on the current layer or
// inside the tile bounding box, it can be skipped
if (way.getLayer() != layer) continue;
Map<String, String> tags = way.getTags();
if (tags != null) {
if (RuleSet.checkRule(rule, tags)) {
paths += buildPath(surface, way.getWayNode());
}
}
}
if (paths != 0) {
Graphics2D graphics = surface.getGraphics();
while (d != null) {
if (d.getMinZoom() > surface.zoomLevel || d.getMaxZoom() < surface.zoomLevel) {
d = d.next();
continue;
}
switch (d.type) {
case Draw.POLYGONE:
graphics.setPaint(getPaint(d.getPattern(), d.getColor()));
graphics.fill(surface.path);
break;
case Draw.LINE:
float strokeWidth = d.getWidth() * linesize(surface.zoomLevel);
if (strokeWidth > 0.5f) {
Stroke stroke =
new BasicStroke(strokeWidth, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
graphics.setPaint(d.getColor());
graphics.setStroke(stroke);
graphics.draw(surface.path);
}
break;
case Draw.TEXT:
break; /* ignore since we will process it in other step */
}
d = d.next();
}
}
}
public void drawTile(final OutputStream out, final int x, final int y, final int zoom_level)
throws IOException {
int c_zoom_level = clamp(zoom_level, MIN_ZOOM_LEVEL, MAX_ZOOM_LEVEL);
Coordinate crd = tile2latlon(x, y, c_zoom_level);
Coordinate offset = coord2xy(crd.x, crd.y, c_zoom_level, resolution);
BoundingBox bbox = Mercator.tileEdges(x, y, c_zoom_level);
MapSurface surface =
new MapSurface(resolution, resolution, rules.getBgColor(), c_zoom_level, offset, bbox);
List<Way> mapData = map.getWaysInBoundingBox(bbox);
render(surface, mapData);
surface.write(out);
surface.flush();
}
private void renderText(
MapSurface surface, int layer, Rule rule, Draw draw, final List<Way> mapData) {
Graphics2D graphics = surface.getGraphics();
Draw d = draw;
while (d != null) {
Font font = getFont((int) (d.getWidth() * linesize(surface.zoomLevel)));
if (d.type == Draw.TEXT && font != null) {
if (draw.getMinZoom() <= surface.zoomLevel && surface.zoomLevel <= draw.getMaxZoom()) {
for (Way way : mapData) {
// Only objects on current layer
if (way.getLayer() != layer || way.getName() == null) continue;
Map<String, String> tags = way.getTags();
if (tags != null) {
if (RuleSet.checkRule(rule, tags)) {
// TODO: verify if there is a path and render text along the path? or see how
// osmarender does it?
graphics.setFont(font);
graphics.setPaint(d.getColor());
Node nd = way.getWayNode().get(0);
Coordinate xy = coord2xy(nd.getLat(), nd.getLon(), surface.zoomLevel, resolution);
graphics.drawString(
way.getName(),
(int) (xy.x - surface.offset.x),
(int) (xy.y - surface.offset.y));
}
}
}
}
break;
}
d = d.next();
}
}