com.hereastory.ui.MarkerClusteringOptionsProvider.java Source code

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Here is the source code for com.hereastory.ui.MarkerClusteringOptionsProvider.java

Source

package com.hereastory.ui;

/*
 * Copyright (C) 2013 Maciej Grski
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.Rect;
import android.support.v4.util.LruCache;

import com.androidmapsextensions.ClusterOptions;
import com.androidmapsextensions.ClusterOptionsProvider;
import com.androidmapsextensions.Marker;
import com.google.android.gms.maps.model.BitmapDescriptor;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.hereastory.R;

import java.util.List;

public class MarkerClusteringOptionsProvider implements ClusterOptionsProvider {

    private static final int[] res = { R.drawable.ic_poi_clusterd, R.drawable.m2, R.drawable.m3, R.drawable.m4,
            R.drawable.m5 };

    private static final int[] forCounts = { 10, 100, 1000, 10000, Integer.MAX_VALUE };

    private Bitmap[] baseBitmaps;
    private LruCache<Integer, BitmapDescriptor> cache = new LruCache<Integer, BitmapDescriptor>(128);

    private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    private Rect bounds = new Rect();

    private ClusterOptions clusterOptions = new ClusterOptions().anchor(0.5f, 0.5f);

    public MarkerClusteringOptionsProvider(Resources resources) {
        baseBitmaps = new Bitmap[res.length];
        for (int i = 0; i < res.length; i++) {
            baseBitmaps[i] = BitmapFactory.decodeResource(resources, res[i]);
        }
        paint.setColor(Color.WHITE);
        paint.setTextAlign(Align.CENTER);
        paint.setTextSize(25);
    }

    @Override
    public ClusterOptions getClusterOptions(List<Marker> markers) {

        int markersCount = markers.size();
        BitmapDescriptor cachedIcon = cache.get(markersCount);
        if (cachedIcon != null) {
            return clusterOptions.icon(cachedIcon);
        }

        Bitmap base;
        int i = 0;
        do {
            base = baseBitmaps[i];
        } while (markersCount >= forCounts[i++]);

        Bitmap bitmap = base.copy(Config.ARGB_8888, true);

        String text = String.valueOf(markersCount);
        paint.getTextBounds(text, 0, text.length(), bounds);
        paint.setTextSize(40);
        float x = bitmap.getWidth() / 2.0f;
        float y = (bitmap.getHeight() - bounds.height()) / 2.0f - bounds.top;

        Canvas canvas = new Canvas(bitmap);
        canvas.drawText(text, x, y, paint);

        BitmapDescriptor icon = BitmapDescriptorFactory.fromBitmap(bitmap);
        cache.put(markersCount, icon);

        return clusterOptions.icon(icon);
    }
}