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Remove the concept of min/max zoom level from Map. Replace it with concept of num zoom levels. Bit of rearrangement in the initResolutions() function in HTTPRequest.js. Adapt all of OL to deal with numZoomLevels instead of min/max. Fix PanZoomBar so that it listens for change of baselayer and redraws itself. fix all tests so they pass. Add zoomLevels.html example for playing around with different methods of setting zoomlevels.

Browse Source 
git-svn-id: http://svn.openlayers.org/branches/openlayers/2.0@1302 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
euzuro
2006-08-19 02:09:29 +00:00
parent 1a12d90455
commit 17581c714d
11 changed files with 205 additions and 160 deletions
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90
lib/OpenLayers/Layer/HTTPRequest.js
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@@ -36,10 +36,17 @@ OpenLayers.Layer.HTTPRequest.prototype =
this.params = Object.extend( new Object(), params);
},
/** When the layer is added to the map, once it has taken all the
* relevant properties from the map (in Layer.setMap()), we will
* make the call to initialize the layer's resolutions array.
*
* @param {OpenLayers.Map} map
*/
setMap: function(map) {
OpenLayers.Layer.prototype.setMap.apply(this, arguments);
this.initResolutions();
},
/**
*
*/
@@ -131,31 +138,78 @@ OpenLayers.Layer.HTTPRequest.prototype =
return requestString;
},
/** This method's responsibility is to set up the 'resolutions' array
* for the layer -- this array is what the layer will use to interface
* between the zoom levels of the map and the resolution display of the
* layer.
*
* The user has several options that determine how the array is set up.
*
* For a detailed explanation, see the following wiki from the
* openlayers.org homepage:
*
* http://trac.openlayers.org/wiki/SettingZoomLevels
*
* @private
*/
initResolutions: function() {
if (this.scales != null) {
this.resolutions = new Array();
for(var i = 0; i < this.scales.length; i++)
this.resolutions[i] = OpenLayers.Util.getResolutionFromScale(this.scales[i], this.units);
this.maxZoomLevel = this.resolutions.length;
} else if (this.resolutions != null) {
this.maxZoomLevel = this.resolutions.length;
if ((this.scales != null) || (this.resolutions != null)) {
//preset levels
if (this.scales != null) {
this.resolutions = new Array();
for(var i = 0; i < this.scales.length; i++) {
this.resolutions[i] =
OpenLayers.Util.getResolutionFromScale(this.scales[i],
this.units);
}
}
this.numZoomLevels = this.resolutions.length;
} else {
//maxResolution and numZoomLevels
this.resolutions = new Array();
if (this.minScale)
this.maxResolution = OpenLayers.Util.getResolutionFromScale(this.minScale, this.units);
var maxRes = this.getMaxResolution();
if (this.maxScale) {
/* This will cause this.map.getMaxZoomLevel() to be set the next time
* it is called, which means that the next portion here will succeed. */
var minRes = OpenLayers.Util.getResolutionFromScale(this.maxScale);
this.maxZoomLevel = Math.floor(Math.log(maxRes/minRes) / Math.log(2));
}
for (var i=this.getMinZoomLevel(); i <= this.getMaxZoomLevel(); i++) {
this.resolutions.push(maxRes / Math.pow(2, i));
// determine maxResolution
if (this.minScale) {
this.maxResolution =
OpenLayers.Util.getResolutionFromScale(this.minScale,
this.units);
} else if (this.maxResolution == "auto") {
var maxExtent = this.getMaxExtent();
var viewSize = this.map.getSize();
var wRes = maxExtent.getWidth() / viewSize.w;
var hRes = maxExtent.getHeight()/ viewSize.h;
this.maxResolution = Math.max(wRes, hRes);
}
// determine numZoomLevels
if (this.maxScale != null) {
this.minResolution =
OpenLayers.Util.getResolutionFromScale(this.maxScale);
}
if (this.minResolution != null) {
var ratio = this.maxResolution / this.minResolution;
this.numZoomLevels =
Math.floor(Math.log(ratio) / Math.log(2)) + 1;
}
// now we have numZoomLevels and maxResolution,
// we can populate the resolutions array
for (var i=0; i < this.numZoomLevels; i++) {
this.resolutions.push(this.maxResolution / Math.pow(2, i));
}
}
},
/**
* @returns The currently selected resolution of the map, taken from the
* resolutions array, indexed by current zoom level.
* @type float
*/
getResolution: function() {
var zoom = this.map.getZoom();