Nextzen MVT & GeoJSON vector tiles, fix #498

2018-02-06 11:41:33 +02:00
parent f7f1940054
commit beed7335fc
9 changed files with 466 additions and 0 deletions
--- a/vtm-json/src/org/oscim/tiling/source/geojson/NextzenGeojsonTileSource.java
+++ b/vtm-json/src/org/oscim/tiling/source/geojson/NextzenGeojsonTileSource.java
@@ -0,0 +1,123 @@
+/*
+ * Copyright 2018 devemux86
+ *
+ * This program is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.oscim.tiling.source.geojson;
+
+import org.oscim.core.MapElement;
+import org.oscim.core.Tag;
+import org.oscim.tiling.source.UrlTileSource;
+import org.oscim.utils.math.MathUtils;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public class NextzenGeojsonTileSource extends GeojsonTileSource {
+
+    private final static String DEFAULT_URL = "https://tile.nextzen.org/tilezen/vector/v1/all";
+    private final static String DEFAULT_PATH = "/{Z}/{X}/{Y}.json";
+
+    public static class Builder<T extends Builder<T>> extends UrlTileSource.Builder<T> {
+        private String locale = "";
+
+        public Builder() {
+            super(DEFAULT_URL, DEFAULT_PATH, 1, 17);
+            keyName("api_key");
+        }
+
+        public T locale(String locale) {
+            this.locale = locale;
+            return self();
+        }
+
+        public NextzenGeojsonTileSource build() {
+            return new NextzenGeojsonTileSource(this);
+        }
+    }
+
+    @SuppressWarnings("rawtypes")
+    public static Builder<?> builder() {
+        return new Builder();
+    }
+
+    private static Map<String, Tag> mappings = new LinkedHashMap<>();
+
+    private static Tag addMapping(String key, String val) {
+        Tag tag = new Tag(key, val);
+        mappings.put(key + "=" + val, tag);
+        return tag;
+    }
+
+    private final String locale;
+
+    public NextzenGeojsonTileSource(Builder<?> builder) {
+        super(builder);
+        this.locale = builder.locale;
+    }
+
+    public NextzenGeojsonTileSource() {
+        this(builder());
+    }
+
+    public NextzenGeojsonTileSource(String urlString) {
+        this(builder().url(urlString));
+    }
+
+    @Override
+    public void decodeTags(MapElement mapElement, Map<String, Object> properties) {
+        boolean hasName = false;
+        String fallbackName = null;
+
+        for (Map.Entry<String, Object> entry : properties.entrySet()) {
+            String key = entry.getKey();
+            Object value = entry.getValue();
+            String val = (value instanceof String) ? (String) value : String.valueOf(value);
+
+            if (key.startsWith(Tag.KEY_NAME)) {
+                int len = key.length();
+                if (len == 4) {
+                    fallbackName = val;
+                    continue;
+                }
+                if (len < 7)
+                    continue;
+                if (locale.equals(key.substring(5))) {
+                    hasName = true;
+                    mapElement.tags.add(new Tag(Tag.KEY_NAME, val, false));
+                }
+                continue;
+            }
+
+            Tag tag = mappings.get(key + "=" + val);
+            if (tag == null)
+                tag = addMapping(key, val);
+            mapElement.tags.add(tag);
+        }
+
+        if (!hasName && fallbackName != null)
+            mapElement.tags.add(new Tag(Tag.KEY_NAME, fallbackName, false));
+
+        // Calculate height of building parts
+        if (!properties.containsKey(Tag.KEY_HEIGHT)) {
+            if (properties.containsKey(Tag.KEY_VOLUME) && properties.containsKey(Tag.KEY_AREA)) {
+                Object volume = properties.get(Tag.KEY_VOLUME);
+                String volumeStr = (volume instanceof String) ? (String) volume : String.valueOf(volume);
+                Object area = properties.get(Tag.KEY_AREA);
+                String areaStr = (area instanceof String) ? (String) area : String.valueOf(area);
+                float height = Float.parseFloat(volumeStr) / Float.parseFloat(areaStr);
+                String heightStr = String.valueOf(MathUtils.round2(height));
+                mapElement.tags.add(new Tag(Tag.KEY_HEIGHT, heightStr, false));
+            }
+        }
+    }
+}