Android Open Source - android_maplib T M S Layer

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Project:  NextGIS Mobile//from w w w . j a v  a 2s  .  c o m
 * Purpose:  Mobile GIS for Android.
 * Author:   Dmitry Baryshnikov (aka Bishop), bishop.dev@gmail.com
 * *****************************************************************************
 * Copyright (c) 2012-2015. NextGIS, info@nextgis.com
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.nextgis.maplib.map;

import android.content.Context;
import android.graphics.Bitmap;
import com.nextgis.maplib.api.IJSONStore;
import com.nextgis.maplib.datasource.GeoEnvelope;
import com.nextgis.maplib.datasource.GeoPoint;
import com.nextgis.maplib.datasource.TileItem;
import com.nextgis.maplib.display.GISDisplay;
import com.nextgis.maplib.display.TMSRenderer;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import static com.nextgis.maplib.util.GeoConstants.TMSTYPE_OSM;
import static com.nextgis.maplib.util.Constants.*;

public abstract class TMSLayer
        extends Layer
{
    protected static final String JSON_TMSTYPE_KEY       = "tms_type";
    protected int mTMSType;
    protected static final int    HTTP_SEPARATE_THREADS       = 2;
    //protected List<String> checkDuplicates = new ArrayList<>();

    protected TMSLayer(
            Context contex,
            File path)
    {
        super(contex, path);

        mRenderer = new TMSRenderer(this);
    }


    public int getTMSType()
    {
        return mTMSType;
    }


    public void setTMSType(int type)
    {
        mTMSType = type;
    }


    public final List<TileItem> getTielsForBounds(
            GISDisplay display,
            GeoEnvelope bounds,
            double zoom)
    {

        int nZoom = (int) zoom;
        int tilesInMap = 1 << nZoom;
        double halfTilesInMap = tilesInMap / 2;
        GeoEnvelope fullBounds = display.getFullBounds();
        GeoPoint mapTileSize =
                new GeoPoint(fullBounds.width() / tilesInMap, fullBounds.height() / tilesInMap);

        List<TileItem> list = new ArrayList<>();

        int begX = (int) (bounds.getMinX() / mapTileSize.getX() - .5 + halfTilesInMap);
        int begY = (int) (bounds.getMinY() / mapTileSize.getY() - .5 + halfTilesInMap);
        int endX = (int) (bounds.getMaxX() / mapTileSize.getX() + .5 + halfTilesInMap);
        int endY = (int) (bounds.getMaxY() / mapTileSize.getY() + .5 + halfTilesInMap);

        if (begY < 0) {
            begY = 0;
        }
        if (endY > tilesInMap) {
            endY = tilesInMap;
        }

        //fill tiles from center
/*
        checkDuplicates.clear();
        int centerX = begX + (endX - begX) / 2;
        int centerY = begY + (endY - begY) / 2;
        int center = Math.max(centerX, centerY);

        //add center point
        addItemToList(fullBounds, mapTileSize, centerX, centerY, nZoom, tilesInMap, list);

        for (int k = 1; k < center + 2; k++) {
            //1. top and bottom
            int tileBottom = centerY - k;
            if(tileBottom < begY)
                tileBottom = begY;
            int tileTop = centerY + k;
            if(tileTop > endY)
                tileTop = endY;
            for (int i = centerX - k; i < centerX + k + 1; i++) {
                if(i < begX || i > endX)
                    continue;
                addItemToList(fullBounds, mapTileSize, i, tileTop, nZoom, tilesInMap, list);
                addItemToList(fullBounds, mapTileSize, i, tileBottom, nZoom, tilesInMap, list);
            }

            //2. left and right
            int tileLeft = centerX - k;
            if(tileLeft < begX)
                tileLeft = begX;
            int tileRight = centerX + k;
            if(tileRight > endX)
                tileRight = endX;
            for (int j = centerY - k; j < centerY + k + 1; j++) {
                if(j < begY || j > endY)
                    continue;
                addItemToList(fullBounds, mapTileSize, tileLeft, j, nZoom, tilesInMap, list);
                addItemToList(fullBounds, mapTileSize, tileRight, j, nZoom, tilesInMap, list);
            }
        }
*/
        // normal fill from left bottom corner
        int realY;
        int realX;
        for(int x = begX; x < endX; x++){
            for(int y = begY; y < endY; y++){

                realX = x;
                if (realX < 0) {
                    realX += tilesInMap;
                } else if (realX >= tilesInMap) {
                    realX -= tilesInMap;
                }

                realY = y;
                if(mTMSType == TMSTYPE_OSM){
                    realY = tilesInMap - y - 1;
                }

                if (realY < 0 || realY >= tilesInMap) {
                    continue;
                }

                final GeoPoint pt = new GeoPoint(fullBounds.getMinX() + x * mapTileSize.getX(), fullBounds.getMinY() + (y + 1) * mapTileSize.getY());
                TileItem item = new TileItem(realX, realY, nZoom, pt);
                list.add(item);
            }
        }

        return list;
    }

/*
    protected void addItemToList(
            final GeoEnvelope fullBounds,
            final GeoPoint mapTileSize,
            int x,
            int y,
            int zoom,
            int tilesInMap,
            List<TileItem> list)
    {
        int realX = x;
        if (realX < 0) {
            //while(realX < 0)
                realX += tilesInMap;
        } else if (realX >= tilesInMap) {
            //while(realX >= tilesInMap)
                realX -= tilesInMap;
        }

        final GeoPoint pt = new GeoPoint(fullBounds.getMinX() + x * mapTileSize.getX(),
                                         fullBounds.getMinY() + (y + 1) * mapTileSize.getY());
        int realY = y;
        if (mTMSType == TMSTYPE_OSM) {
            realY = tilesInMap - y - 1;
        }

        if (realY < 0 || realY >= tilesInMap) {
            return;
        }

        if(checkDuplicates.contains(realX + "." + realY))// + "." + zoom
            return;

        checkDuplicates.add(realX + "." + realY);// + "." + zoom
        TileItem item = new TileItem(realX, realY, zoom, pt);
        list.add(item);
    }
*/

    public abstract Bitmap getBitmap(TileItem tile);


    @Override
    public JSONObject toJSON()
            throws JSONException
    {
        JSONObject rootConfig = super.toJSON();
        rootConfig.put(JSON_TMSTYPE_KEY, mTMSType);
        if (mRenderer instanceof IJSONStore) {
            IJSONStore jsonStore = (IJSONStore) mRenderer;
            rootConfig.put(JSON_RENDERERPROPS_KEY, jsonStore.toJSON());
        }
        return rootConfig;
    }


    @Override
    public void fromJSON(JSONObject jsonObject)
            throws JSONException
    {
        super.fromJSON(jsonObject);
        mTMSType = jsonObject.getInt(JSON_TMSTYPE_KEY);
        if (jsonObject.has(JSON_RENDERERPROPS_KEY)) {
            if (mRenderer instanceof IJSONStore) {
                IJSONStore jsonStore = (IJSONStore) mRenderer;
                jsonStore.fromJSON(jsonObject.getJSONObject(JSON_RENDERERPROPS_KEY));
            }
        }
    }

    public int getMaxThreadCount()
    {
        return HTTP_SEPARATE_THREADS;
    }
}

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