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Add a getTileBounds method to gridded layers. Thanks to crschmidt for the tests on this one. Committed with a few minor ndoc changes (closes 482).

Browse Source 
git-svn-id: http://svn.openlayers.org/trunk/openlayers@4088 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
Tim Schaub
2007-08-28 23:16:23 +00:00
parent 6acf9e75c5
commit d7776e77a7
4 changed files with 94 additions and 6 deletions
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41
lib/OpenLayers/Layer/Grid.js
View File

@@ -229,13 +229,16 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
},
/**
* Method: getTilesBounds
* Get the bounds of the grid
*
* Return:
* APIMethod: getTileBounds
* Returns The tile bounds for a layer given a pixel location.
*
* Parameters:
* viewPortPx - {<OpenLayers.Pixel>} The location in the viewport.
*
* Returns:
* {<OpenLayers.Bounds>} A Bounds object representing the bounds of all the
* currently loaded tiles (including those partially or not at all seen
* onscreen)
* currently loaded tiles (including those partially or not at all seen
* onscreen).
*/
getTilesBounds: function() {
var bounds = null;
@@ -673,5 +676,31 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
}
},
/**
* APIMethod: getTileBounds
* Returns The tile bounds for a layer given a pixel location
*
* Parameters:
* viewPortPx - {OpenLayers.Pixel} The location in the viewport
*/
getTileBounds: function(viewPortPx) {
var maxExtent = this.map.getMaxExtent();
var resolution = this.getResolution();
var tileMapWidth = resolution * this.tileSize.w;
var tileMapHeight = resolution * this.tileSize.h;
var mapPoint = this.getLonLatFromViewPortPx(viewPortPx);
var tileLeft = maxExtent.left + (tileMapWidth *
Math.floor((mapPoint.lon -
maxExtent.left) /
tileMapWidth));
var tileBottom = maxExtent.bottom + (tileMapHeight *
Math.floor((mapPoint.lat -
maxExtent.bottom) /
tileMapHeight));
return new OpenLayers.Bounds(tileLeft, tileBottom,
tileLeft + tileMapWidth,
tileBottom + tileMapHeight);
},
CLASS_NAME: "OpenLayers.Layer.Grid"
});

22
lib/OpenLayers/Layer/KaMap.js
View File

@@ -225,6 +225,28 @@ OpenLayers.Layer.KaMap = OpenLayers.Class(OpenLayers.Layer.Grid, {
return obj;
},
/**
* APIMethod: getTileBounds
* Returns The tile bounds for a layer given a pixel location.
*
* Parameters:
* viewPortPx - {<OpenLayers.Pixel>} The location in the viewport.
*
* Returns:
* {<OpenLayers.Bounds>} Bounds of the tile at the given pixel location.
*/
getTileBounds: function(viewPortPx) {
var resolution = this.getResolution();
var tileMapWidth = resolution * this.tileSize.w;
var tileMapHeight = resolution * this.tileSize.h;
var mapPoint = this.getLonLatFromViewPortPx(viewPortPx);
var tileLeft = tileMapWidth * Math.floor(mapPoint.lon / tileMapWidth);
var tileBottom = tileMapHeight * Math.floor(mapPoint.lat / tileMapHeight);
return new OpenLayers.Bounds(tileLeft, tileBottom,
tileLeft + tileMapWidth,
tileBottom + tileMapHeight);
},
CLASS_NAME: "OpenLayers.Layer.KaMap"
});