From b7f38d5996d2030636290c6265e8c321afa35321 Mon Sep 17 00:00:00 2001
From: Stuart Lynn <stuart.lynn@gmail.com>
Date: Fri, 13 Nov 2015 15:12:44 +0000
Subject: [PATCH] Methods to get the data for a given torque tile from the
 server

---
 lib/torque/leaflet/torque.js          | 22 ++++++++++++++
 lib/torque/provider/filterableJson.js | 44 ++++++++++++++++++++++++++-
 2 files changed, 65 insertions(+), 1 deletion(-)

diff --git a/lib/torque/leaflet/torque.js b/lib/torque/leaflet/torque.js
index 4b66df5..e64cb4e 100644
--- a/lib/torque/leaflet/torque.js
+++ b/lib/torque/leaflet/torque.js
@@ -337,6 +337,28 @@ L.TorqueLayer = L.CanvasLayer.extend({
     canvas.width = canvas.width;
   },
 
+  getDataForPoint:function(x,y,callback, maxNo, tolerance){
+    var maxNo = maxNo || 10
+    var tolerance = tolerance || 10
+
+    for(var t in this._tiles ){
+      tile = this._tiles[t];
+      pos  = this.getTilePos(tile.coord);
+
+      var tileWidth = 255.0/this.options.resolution
+
+      xx = x - pos.x;
+      yy = y - pos.y;
+
+      if(xx >= 0 && yy >= 0 && xx < 255 && yy <= 255) {
+        this.provider.getDataForTorquePixel(tile.coord,xx,yy,maxNo,tolerance,callback)
+        return this
+      }
+    }
+    callback(null)
+    return this
+
+  },
   /*
   _filterTile:function(tile){
     var noPoints = tile.x.length
diff --git a/lib/torque/provider/filterableJson.js b/lib/torque/provider/filterableJson.js
index 7b6d50f..77edf2f 100644
--- a/lib/torque/provider/filterableJson.js
+++ b/lib/torque/provider/filterableJson.js
@@ -424,11 +424,53 @@ var Profiler = require('../profiler');
       });
     },
 
+    /**
+     * `tile`                             the tile the point resides on
+     * `x`                                the x pixel coord on the tile
+     * 'y'                                the y pixel coord on the tile
+     * 'maxNo'                            the maximum number of points to return
+     * 'pixel tollerance around click'    How many pixels to search around the click point
+     * 'callback'                         function(rows) returns an array of the data for that point
+     */
+    getDataForTorquePixel:function(tile,x,y,maxNo,tolerance,callback){
+      shift = 23 - tile.z
+      tolerance = tolerance || 20
+      var sql =""+
+      "with qr as (select * from xyz2range({x},{y},{z})) "+
+      "select *, ((quadkey_x & (255 << {shift})) >> {shift}) AS torque_tile_x, "+
+      "(255 - ((quadkey_y & (255 << {shift})) >> {shift})) AS torque_tile_y "+
+      "from {table}, qr "+
+      "where (quadkey between qr.min and qr.max) "+
+      "and ((((quadkey_x & (255 << {shift})) >> {shift}) - {torque_tile_x}) between -{tolerance} and {tolerance})  and (((255 - ((quadkey_y & (255 << {shift})) >> {shift})) - {torque_tile_y}) between -{tolerance} and {tolerance}) "+
+      "limit {maxNo}"
+
+      var query = format(sql,{
+        x: tile.x,
+        y: tile.y,
+        z: tile.z,
+        table: this.options.table,
+        torque_tile_x: x,
+        torque_tile_y: y,
+        maxNo: maxNo,
+        shift: shift,
+        tolerance: tolerance
+      })
+
+      this.sql(query,function(data){
+        if(data){
+          var rows = JSON.parse(data.responseText).rows;
+          callback(rows)
+        }
+        else{
+          callback(null)
+        }
+      })
+    },
+
     /**
      * `coord` object like {x : tilex, y: tiley }
      * `zoom` quadtree zoom level
      */
-
     _getTileData: function(coord, zoom, callback) {
       var prof_fetch_time = Profiler.metric('ProviderJSON:tile_fetch_time').start()
       this.table = this.options.table;