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move baselayer functions down and separated from private layer functions

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git-svn-id: http://svn.openlayers.org/branches/openlayers/2.0@1284 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
euzuro
2006-08-17 17:36:17 +00:00
parent 36ec579e39
commit fa3b3a3d0c
1 changed files with 62 additions and 61 deletions
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123
lib/OpenLayers/Layer/Grid.js
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@@ -320,67 +320,6 @@ OpenLayers.Layer.Grid.prototype =
},
/********************************************************/
/* */
/* Baselayer Functions */
/* */
/********************************************************/
/** Calculates based on resolution, center, and mapsize
*
* @returns A Bounds object which represents the lon/lat bounds of the
* current viewPort.
* @type OpenLayers.Bounds
*/
getExtent: function () {
var extent = null;
var center = this.map.getCenter();
if (center != null) {
var res = this.map.getResolution();
var size = this.map.getSize();
var w_deg = size.w * res;
var h_deg = size.h * res;
extent = new OpenLayers.Bounds(center.lon - w_deg / 2,
center.lat - h_deg / 2,
center.lon + w_deg / 2,
center.lat + h_deg / 2);
}
return extent;
},
/**
* @param {OpenLayers.Bounds} bounds
*
* @return {int}
*/
getZoomForExtent: function (bounds) {
var maxRes = this.map.getMaxResolution();
var viewSize = this.map.getSize();
var width = bounds.getWidth();
var height = bounds.getHeight();
var degPerPixel = (width > height) ? width / viewSize.w
: height / viewSize.h;
var zoom = Math.floor( (Math.log(maxRes/degPerPixel)) / Math.log(2) );
var maxZoomLevel = this.map.getMaxZoomLevel();
var minZoomLevel = this.map.getMinZoomLevel();
//make sure zoom is within bounds
zoom = Math.min( Math.max(zoom, minZoomLevel),
maxZoomLevel );
return zoom;
},
/** go through and remove all tiles from the grid, calling
* destroy() on each of them to kill circular references
*
@@ -462,6 +401,68 @@ OpenLayers.Layer.Grid.prototype =
}
},
/********************************************************/
/* */
/* Baselayer Functions */
/* */
/********************************************************/
/** Calculates based on resolution, center, and mapsize
*
* @returns A Bounds object which represents the lon/lat bounds of the
* current viewPort.
* @type OpenLayers.Bounds
*/
getExtent: function () {
var extent = null;
var center = this.map.getCenter();
if (center != null) {
var res = this.map.getResolution();
var size = this.map.getSize();
var w_deg = size.w * res;
var h_deg = size.h * res;
extent = new OpenLayers.Bounds(center.lon - w_deg / 2,
center.lat - h_deg / 2,
center.lon + w_deg / 2,
center.lat + h_deg / 2);
}
return extent;
},
/**
* @param {OpenLayers.Bounds} bounds
*
* @return {int}
*/
getZoomForExtent: function (bounds) {
var maxRes = this.map.getMaxResolution();
var viewSize = this.map.getSize();
var width = bounds.getWidth();
var height = bounds.getHeight();
var degPerPixel = (width > height) ? width / viewSize.w
: height / viewSize.h;
var zoom = Math.floor( (Math.log(maxRes/degPerPixel)) / Math.log(2) );
var maxZoomLevel = this.map.getMaxZoomLevel();
var minZoomLevel = this.map.getMinZoomLevel();
//make sure zoom is within bounds
zoom = Math.min( Math.max(zoom, minZoomLevel),
maxZoomLevel );
return zoom;
},
/** @final @type String */
CLASS_NAME: "OpenLayers.Layer.Grid"
});