Only load a certain extent

build.rs

@@ -11,13 +11,15 @@ fn main() {
     let out_dir = env::var("OUT_DIR").unwrap();
 
     let out = PathBuf::from(Path::new(&out_dir).join("munich-tiles"));
-    fs::remove_dir_all(&out);
+    fs::remove_dir_all(&out).unwrap();
     //let out = PathBuf::from(Path::new(&root_dir).join("test-data/munich-tiles"));
     let source = Path::new(&root_dir).join("test-data/maptiler-osm-2017-07-03-v3.6.1-germany_munich.mbtiles");
 
+    // Pack tiles around Maxvorstadt (100 tiles in each direction)
     extract(source,
             out,
+            12,
+            (2179 - 100)..(2179 + 100),
+            (1421 - 100)..(1421 + 100),
     ).unwrap();
-
-
 }

libs/mapr_utils/src/mbtiles.rs

@@ -1,11 +1,12 @@
 use std::{fs, io};
-use std::collections::{HashMap};
+use std::collections::HashMap;
 use std::fs::File;
 use std::io::Write;
-use std::path::{Path};
+use std::ops::Range;
+use std::path::Path;
 
 use flate2::bufread::GzDecoder;
-use rusqlite::{Connection, Row};
+use rusqlite::{Connection, params, Row};
 
 #[derive(Debug)]
 pub enum Error {
@@ -32,8 +33,10 @@ impl From<rusqlite::Error> for Error {
 }
 
 pub fn extract<P: AsRef<Path>, R: AsRef<Path>>(input_mbtiles: P,
-                                               output_dir: R)
-                                               -> Result<(), Error> {
+                                               output_dir: R,
+                                               z: u32,
+                                               x_range: Range<u32>,
+                                               y_range: Range<u32>) -> Result<(), Error> {
     let input_path = input_mbtiles.as_ref().to_path_buf();
     if !input_path.is_file() {
         return Err(Error::IO(format!("Input file {:?} is not a file", input_path)));
@@ -51,8 +54,17 @@ pub fn extract<P: AsRef<Path>, R: AsRef<Path>>(input_mbtiles: P,
 
     // language=SQL
     let mut prepared_statement = connection
-        .prepare("SELECT zoom_level, tile_column, tile_row, tile_data FROM tiles;")?;
-    let mut tiles_rows = prepared_statement.query([])?;
+        .prepare("SELECT zoom_level, tile_column, tile_row, tile_data
+                        FROM tiles
+                        WHERE   (zoom_level = ?1) AND
+                                (tile_column BETWEEN ?2 AND ?3) AND
+                                (tile_row BETWEEN ?4 AND ?5);")?;
+
+    let mut tiles_rows = prepared_statement.query(params![
+        z,
+        x_range.start, x_range.end,
+        flip_vertical_axis(z, y_range.end), flip_vertical_axis(z, y_range.start) // in mbtiles it is stored flipped
+    ])?;
 
     while let Ok(Some(tile)) = tiles_rows.next() {
         extract_tile(&tile, &output_path)?;
@@ -61,6 +73,11 @@ pub fn extract<P: AsRef<Path>, R: AsRef<Path>>(input_mbtiles: P,
     Ok(())
 }
 
+
+fn flip_vertical_axis(zoom: u32, value: u32)-> u32 {
+    2u32.pow(zoom) - 1 - value
+}
+
 fn extract_tile(tile: &Row,
                 output_path: &Path)
                 -> Result<(), Error> {
@@ -69,7 +86,7 @@ fn extract_tile(tile: &Row,
                                           tile.get::<_, u32>(2)?);
 
     // Flip vertical axis
-    y = 2u32.pow(z) - 1 - y;
+    y = flip_vertical_axis(z, y);
 
     let tile_dir = output_path.join(format!("{}/{}", z, x));
 

libs/vector_tile/src/encoding.rs

@@ -215,10 +215,10 @@ impl Decode<Feature> for (&ProtoLayer, ProtoFeature) {
             let value = chunk[1];
 
             let keys = &layer.keys;
-            if let Some(actualKey) = keys.get(key as usize) {
+            if let Some(actual_key) = keys.get(key as usize) {
                 let values = &layer.values;
-                if let Some(actualValue) = values.get(value as usize) {
-                    properties.insert(actualKey.clone(), actualValue.clone().decode());
+                if let Some(actual_value) = values.get(value as usize) {
+                    properties.insert(actual_key.clone(), actual_value.clone().decode());
                 }
             }
         }

libs/vector_tile/src/lib.rs

@@ -1,5 +1,5 @@
 use std::fs::File;
-use std::io::{BufRead, BufReader, Read};
+use std::io::{BufRead, BufReader};
 use std::path::{Path};
 
 use protobuf::Message;
@@ -21,7 +21,7 @@ pub mod grid;
 pub mod error;
 
 pub fn parse_tile<P: AsRef<Path>>(path: P) -> Result<Tile, Error> {
-    let mut f = File::open(path)?;
+    let f = File::open(path)?;
     let mut reader = BufReader::new(f);
     parse_tile_reader(&mut reader).into()
 }

libs/vector_tile/src/tile.rs

@@ -2,7 +2,7 @@ use std::collections::HashMap;
 
 use crate::geometry::Geometry;
 use crate::protos::vector_tile::{
-    Tile as ProtoTile, Tile_Feature, Tile_Feature as ProtoFeature, Tile_Layer as ProtoLayer,
+    Tile as ProtoTile, Tile_Feature as ProtoFeature, Tile_Layer as ProtoLayer,
 };
 
 #[derive(Debug)]

src/io/static_database.rs

@@ -5,9 +5,7 @@ use include_dir::{Dir, File, include_dir};
 
 static TILES: Dir = include_dir!("$OUT_DIR/munich-tiles");
 
-pub fn get_tile_count() -> usize {
-    TILES.files().count()
-}
+static mut TEST: u32 = 0;
 
 pub fn get_source_path() -> &'static str {
     concat!(env!("OUT_DIR"), "/munich-tiles")
@@ -18,12 +16,11 @@ pub fn get_tile(x: u32, y: u32, z: u32) -> Option<&'static File<'static>> {
 }
 
 mod tests {
-    use crate::io::static_database::{get_tile, get_tile_count};
+    use super::{get_tile};
 
     #[test]
     fn test_tiles_available() {
-        assert_eq!(get_tile_count(), 1); // World overview
-        assert!(get_tile(0,0,0).is_some()); // World overview
+        assert!(get_tile(0,0,0).is_none()); // World overview
         assert!(get_tile(2179, 1421,12).is_some()); // Maxvorstadt Munich
     }
 }

src/render/camera.rs

@@ -1,7 +1,6 @@
 use std::f32::consts::FRAC_PI_2;
 
 use cgmath::prelude::*;
-use log::info;
 
 use crate::render::shader_ffi::CameraUniform;