use of org.opentripplanner.inspector.TileRenderer.TileRenderContext in project OpenTripPlanner by opentripplanner.
the class TileRendererManager method renderTile.
public BufferedImage renderTile(final TileRequest tileRequest, String layer) {
TileRenderContext context = new TileRenderContext() {
@Override
public Envelope expandPixels(double marginXPixels, double marginYPixels) {
Envelope retval = new Envelope(bbox);
retval.expandBy(marginXPixels / tileRequest.width * (bbox.getMaxX() - bbox.getMinX()), marginYPixels / tileRequest.height * (bbox.getMaxY() - bbox.getMinY()));
return retval;
}
};
context.graph = graph;
TileRenderer renderer = renderers.get(layer);
if (renderer == null)
throw new IllegalArgumentException("Unknown layer: " + layer);
// The best place for caching tiles may be here
BufferedImage image = new BufferedImage(tileRequest.width, tileRequest.height, renderer.getColorModel());
context.graphics = image.createGraphics();
Envelope2D trbb = tileRequest.bbox;
context.bbox = new Envelope(trbb.x, trbb.x + trbb.width, trbb.y, trbb.y + trbb.height);
context.transform = new AffineTransformation();
double xScale = tileRequest.width / trbb.width;
double yScale = tileRequest.height / trbb.height;
context.transform.translate(-trbb.x, -trbb.y - trbb.height);
context.transform.scale(xScale, -yScale);
context.metersPerPixel = Math.toRadians(trbb.height) * 6371000 / tileRequest.height;
context.tileWidth = tileRequest.width;
context.tileHeight = tileRequest.height;
long start = System.currentTimeMillis();
renderer.renderTile(context);
LOG.debug("Rendered tile at {},{} in {} ms", tileRequest.bbox.y, tileRequest.bbox.x, System.currentTimeMillis() - start);
return image;
}
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