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Add ol.source.MapGuide.getScale function

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This commit is contained in:
Frederic Junod
2013-12-16 10:31:48 +01:00
parent ede84739c4
commit b381536b2a
1 changed files with 7 additions and 6 deletions
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13
src/ol/source/mapguidesource.js
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@@ -98,20 +98,20 @@ ol.source.MapGuide.prototype.getImage =
/**
* @param {ol.Extent} extent The map extents.
* @param {ol.Size} size the viewport size.
* @param {number} metersPerUnit The meters-per-unit value.
* @param {number} dpi The display resolution.
* @return {number} The computed map scale.
*/
ol.source.MapGuide.prototype.getScale = function(extent, size) {
ol.source.MapGuide.getScale = function(extent, size, metersPerUnit, dpi) {
var mcsW = ol.extent.getWidth(extent);
var mcsH = ol.extent.getHeight(extent);
var devW = size[0];
var devH = size[1];
var dpi = this.displayDpi_;
var mpu = this.metersPerUnit_;
var mpp = 0.0254 / dpi;
if (devH * mcsW > devW * mcsH) {
return mcsW * mpu / (devW * mpp); // width limited
return mcsW * metersPerUnit / (devW * mpp); // width limited
} else {
return mcsH * mpu / (devH * mpp); // height limited
return mcsH * metersPerUnit / (devH * mpp); // height limited
}
};
@@ -126,7 +126,8 @@ ol.source.MapGuide.prototype.getScale = function(extent, size) {
*/
ol.source.MapGuide.prototype.getUrl =
function(baseUrl, params, extent, size, projection) {
var scale = this.getScale(extent, size);
var scale = ol.source.MapGuide.getScale(extent, size,
this.metersPerUnit_, this.displayDpi_);
var center = ol.extent.getCenter(extent);
var baseParams = {
'OPERATION': this.useOverlay_ ? 'GETDYNAMICMAPOVERLAYIMAGE' : 'GETMAPIMAGE',