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Calculating maxResolution instead of having it in defaults.

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This commit is contained in:
ahocevar
2012-02-15 21:07:48 +01:00
parent 2e423df3d2
commit 262e2d5bc0
6 changed files with 25 additions and 22 deletions
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20
lib/OpenLayers/Layer.js
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@@ -255,8 +255,8 @@ OpenLayers.Layer = OpenLayers.Class({
* APIProperty: maxResolution
* {Float} Default max is 360 deg / 256 px, which corresponds to
* zoom level 0 on gmaps. Specify a different value in the layer
* options if you are not using a geographic projection and
* displaying the whole world.
* options if you are not using the default <OpenLayers.Map.tileSize>
* and displaying the whole world.
*/
maxResolution: null,
@@ -638,12 +638,6 @@ OpenLayers.Layer = OpenLayers.Class({
this.units || this.map.units;
this.initResolutions();
if (!this.resolutions) {
throw(
"Could not calculate resolutions for layer " + this.name +
". Configure maxResolution or resolutions or scales."
);
}
if (!this.isBaseLayer) {
this.inRange = this.calculateInRange();
@@ -896,6 +890,16 @@ OpenLayers.Layer = OpenLayers.Class({
props.resolutions = this.resolutionsFromScales(props.scales);
}
if(props.resolutions == null) {
var maxExtent = this.maxExtent;
if (!props.maxResolution && maxExtent) {
// maxResolution for default grid sets assumes that at zoom
// level zero, the whole world fits on one tile.
var tileSize = this.tileSize || this.map.getTileSize();
props.maxResolution = Math.max(
maxExtent.getWidth() / tileSize.w,
maxExtent.getHeight() / tileSize.h
);
}
props.resolutions = this.calculateResolutions(props);
}
}

4
lib/OpenLayers/Map.js
View File

@@ -274,8 +274,8 @@ OpenLayers.Map = OpenLayers.Class({
/**
* APIProperty: maxResolution
* {Float} Specify if you are not using a geographic projection or Web
* Mercator and displaying the whole world.
* {Float} Required if you are not displaying the whole world on a tile
* with the size specified in <tileSize>.
*/
maxResolution: null,

12
lib/OpenLayers/Projection.js
View File

@@ -167,26 +167,22 @@ OpenLayers.Projection.transforms = {};
* {Object} Defaults for the SRS codes known to OpenLayers (currently
* EPSG:4326, CRS:84, urn:ogc:def:crs:EPSG:6.6:4326, EPSG:900913, EPSG:3857,
* EPSG:102113 and EPSG:102100). Keys are the SRS code, values are units,
* maxExtent (the validity extent for the SRS), maxResolution (the maximum
* resolution commonly used in grid sets for this SRS) and yx (true if this
* SRS is known to have a reverse axis order).
* maxExtent (the validity extent for the SRS) and yx (true if this SRS is
* known to have a reverse axis order).
*/
OpenLayers.Projection.defaults = {
"EPSG:4326": {
units: "degrees",
maxExtent: [-180, -90, 180, 90],
maxResolution: 1.40625,
yx: true
},
"CRS:84": {
units: "degrees",
maxExtent: [-180, -90, 180, 90],
maxResolution: 1.40625
maxExtent: [-180, -90, 180, 90]
},
"EPSG:900913": {
units: "m",
maxExtent: [-20037508.34, -20037508.34, 20037508.34, 20037508.34],
maxResolution: 156543.03390625
maxExtent: [-20037508.34, -20037508.34, 20037508.34, 20037508.34]
}
};