From a3e5944e4ebec8ba303282466277fe29250e109f Mon Sep 17 00:00:00 2001
From: crschmidt <crschmidt@crschmidt.net>
Date: Mon, 26 Jun 2006 13:54:14 +0000
Subject: [PATCH] KaMap layer now sublasses initTiles, to implement the kamap
 0-based tiling scheme instead of the OpenLayers/WW -180,-90 method. This
 means that there are no longer any restrictions on using ka-Map with other
 layers! woohoo! You can use ka-map on top of WorldWind, or with another
 ka-map layer, even if it has differently sized tiles. yay!

git-svn-id: http://svn.openlayers.org/trunk/openlayers@764 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
---
 examples/kamap.html           |  4 ++-
 examples/tiger.html           |  7 ++--
 lib/OpenLayers/Layer/KaMap.js | 63 +++++++++++++++++++++++++++++++++++
 3 files changed, 71 insertions(+), 3 deletions(-)

diff --git a/examples/kamap.html b/examples/kamap.html
index 80a641766e..8261f2cfb4 100644
--- a/examples/kamap.html
+++ b/examples/kamap.html
@@ -17,6 +17,8 @@
                 "http://labs.metacarta.com/wms/vmap0?", {layers: 'basic'} );
             var ka_wms = new OpenLayers.Layer.KaMap( "KaMap", 
                 "http://freemap.in/~crschmidt/ka-map/ka-map-0.2-20060208/htdocs/tile.php?" , { map: 'gmap', g: 'roads' }, 'degrees', 72 );
+            var tiger = new OpenLayers.Layer.KaMap( "KaMap", "http://maps.dmsolutions.ca/demo/us_streets/tile.php", {map:'tiger04', g:'__base__'}); 
+            tiger.setTileSize(new OpenLayers.Size(300,300));
             var jpl_wms = new OpenLayers.Layer.WMS( "NASA Global Mosaic",
                 "http://wms.jpl.nasa.gov/wms.cgi", 
                 {layers: "modis,global_mosaic"});
@@ -24,7 +26,7 @@
 
 
 
-            map.addLayers([jpl_wms, ka_wms]);
+            map.addLayers([jpl_wms, ka_wms, tiger]);
             map.addControl(new OpenLayers.Control.LayerSwitcher());
             map.setCenter(new OpenLayers.LonLat(0, 0), 0);
         }
diff --git a/examples/tiger.html b/examples/tiger.html
index e965786cec..3e204e321c 100644
--- a/examples/tiger.html
+++ b/examples/tiger.html
@@ -11,11 +11,14 @@
     <script type="text/javascript">
         <!--
         function init(){
-            var map = new OpenLayers.Map('map', {'maxResolution': 1.2/4, controls:[]});
+            var map = new OpenLayers.Map('map', {'maxResolution': 1.40625/4, controls:[]});
 
             var ka_wms = new OpenLayers.Layer.KaMap( "KaMap", "http://maps.dmsolutions.ca/demo/us_streets/tile.php", {map:'tiger04', g:'__base__'}); 
             ka_wms.setTileSize(new OpenLayers.Size(300,300));
-            map.addLayers([ka_wms]); // , ka_wms, kamap_wms]);
+            var jpl_wms = new OpenLayers.Layer.WMS( "NASA Global Mosaic",
+                "http://wms.jpl.nasa.gov/wms.cgi", 
+                {layers: "modis,global_mosaic"});
+            map.addLayers([jpl_wms,ka_wms]); // , ka_wms, kamap_wms]);
             map.addControl(new OpenLayers.Control.LayerSwitcher());
             map.addControl(new OpenLayers.Control.MouseToolbar());
             map.addControl(new OpenLayers.Control.PanZoomBar());
diff --git a/lib/OpenLayers/Layer/KaMap.js b/lib/OpenLayers/Layer/KaMap.js
index 687be2ee3d..ad32b67201 100644
--- a/lib/OpenLayers/Layer/KaMap.js
+++ b/lib/OpenLayers/Layer/KaMap.js
@@ -55,6 +55,69 @@ OpenLayers.Layer.KaMap.prototype =
         return new OpenLayers.Tile.Image(this, position, bounds, 
                                              url, this.tileSize);
     },
+    _initTiles:function() {
+
+        //first of all, clear out the main div
+        this.div.innerHTML = "";
+
+        //now clear out the old grid and start a new one
+        this.clearGrid();
+        this.grid = new Array();
+
+        var viewSize = this.map.getSize();
+        var bounds = this.map.getExtent();
+        var extent = this.map.getFullExtent();
+        var resolution = this.map.getResolution();
+        var tilelon = resolution*this.tileSize.w;
+        var tilelat = resolution*this.tileSize.h;
+        
+        var offsetlon = bounds.left;
+        var tilecol = Math.floor(offsetlon/tilelon);
+        var tilecolremain = offsetlon/tilelon - tilecol;
+        var tileoffsetx = -tilecolremain * this.tileSize.w;
+        var tileoffsetlon = tilecol * tilelon;
+        
+        var offsetlat = bounds.top;  
+        var tilerow = Math.ceil(offsetlat/tilelat);
+        var tilerowremain = tilerow - offsetlat/tilelat;
+        var tileoffsety = -(tilerowremain+1) * this.tileSize.h;
+        var tileoffsetlat = tilerow * tilelat;
+        
+        tileoffsetx = Math.round(tileoffsetx); // heaven help us
+        tileoffsety = Math.round(tileoffsety);
+
+        this.origin = new OpenLayers.Pixel(tileoffsetx,tileoffsety);
+
+        var startX = tileoffsetx; 
+        var startLon = tileoffsetlon;
+        
+        do {
+            var row = new Array();
+            this.grid.append(row);
+            tileoffsetlon = startLon;
+            tileoffsetx = startX;
+            do {
+                var tileBounds = new OpenLayers.Bounds(tileoffsetlon, 
+                                                       tileoffsetlat, 
+                                                       tileoffsetlon+tilelon,
+                                                       tileoffsetlat+tilelat);
+
+                var tile = this.addTile(tileBounds, 
+                                        new OpenLayers.Pixel(tileoffsetx - parseInt(this.map.layerContainerDiv.style.left),
+                                                             tileoffsety - parseInt(this.map.layerContainerDiv.style.top))
+                                                            );
+                tile.draw((this.params.TRANSPARENT == 'true'));
+                row.append(tile);
+     
+                tileoffsetlon += tilelon;       
+                tileoffsetx += this.tileSize.w;
+            } while (tileoffsetlon < bounds.right)  
+            
+            tileoffsetlat -= tilelat;
+            tileoffsety += this.tileSize.h;
+        } while(tileoffsetlat > bounds.bottom - tilelat)
+
+    },
     /** @final @type String */
     CLASS_NAME: "OpenLayers.Layer.KaMap"
 });