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added getZoomForResolution() to map & layer. partial fix for #204 -- need to make a getZoomForResolution() for OpenLayers.Layer.FixedZoomLevels

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@1382 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
euzuro
2006-08-26 10:26:12 +00:00
parent d486e1964b
commit 693eab5cc9
2 changed files with 35 additions and 7 deletions
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15
lib/OpenLayers/Layer.js
View File

@@ -376,8 +376,21 @@ OpenLayers.Layer.prototype = {
var idealResolution = Math.max( extent.getWidth() / viewSize.w,
extent.getHeight() / viewSize.h );
return this.getZoomForResolution(idealResolution);
},
/**
* @param {float} resolution
*
* @returns The index of the zoomLevel (entry in the resolutions array)
* that is the smallest resolution that is greater than the
* passed-in resolution.
* @type int
*/
getZoomForResolution: function(resolution) {
for(var i=1; i <= this.resolutions.length; i++) {
if ( this.resolutions[i] < idealResolution) {
if ( this.resolutions[i] < resolution) {
break;
}
}

27
lib/OpenLayers/Map.js
View File

@@ -781,12 +781,12 @@ OpenLayers.Map.prototype = {
/**
* @param {OpenLayers.Bounds} bounds
*
* @returns A suitable zoom level for the specified bounds.
* If no baselayer is set, returns null.
* @type int
*/
* @param {OpenLayers.Bounds} bounds
*
* @returns A suitable zoom level for the specified bounds.
* If no baselayer is set, returns null.
* @type int
*/
getZoomForExtent: function (bounds) {
zoom = null;
if (this.baseLayer != null) {
@@ -795,6 +795,21 @@ OpenLayers.Map.prototype = {
return zoom;
},
/**
* @param {float} resolution
*
* @returns A suitable zoom level for the specified resolution.
* If no baselayer is set, returns null.
* @type int
*/
getZoomForResolution: function(resolution) {
zoom = null;
if (this.baseLayer != null) {
zoom = this.baseLayer.getZoomForResolution(resolution);
}
return zoom;
},
/********************************************************/
/* */
/* Zooming Functions */