UrlTemplateImageryProvider pad url with zeros?

David_Whipps · July 5, 2016, 1:55pm

I’m trying to create a UrlTemplateImageryProvider, but the image URL naming requires a format of:

/1/0001/0001_0001.png

which I was able to create with this template:

var TILE_LOAD_URI_TEMPLATE = ‘/{z}/000{reverseY}/000{reverseY}_000{x}.png’;

The problem of course is that this breaks when e.g. {reverseY} is greater than 9. The generated URL (fragment) is e.g.:

‘/1/00011/00011_0002.png’;

but it needs to be:

‘/1/0011/0011_0002.png’;

(Notice one fewer zero in front of each ‘11’.)

I had a quick look at the source and can’t find a way to do this. Am I missing something?

Dave

hannah · July 5, 2016, 2:26pm

Hi Dave,

I don’t think the UrlTemplateImageryProvider can currently do this. It replaces the bracketed values with the number, so it doesn’t have a way of knowing how many zeros you need in front of the number.

I don’t think it would be too difficult to change the code to do this though. You should be able to change these functions to return a string with the appropriate number of zeros:

github.com

CesiumGS/cesium/blob/master/Source/Scene/UrlTemplateImageryProvider.js#L720-L743


) {
  return undefined;
}


var formatIndex = 0;


var that = this;


function handleResponse(format, data) {
  return format.callback(data);
}


function doRequest() {
  if (formatIndex >= that._getFeatureInfoFormats.length) {
    // No valid formats, so no features picked.
    return when([]);
  }


  var format = that._getFeatureInfoFormats[formatIndex];
  var resource = buildPickFeaturesResource(

This file has been truncated. show original

Just for reference, take a look at our build guide if you need help checkout out the code or building it: https://github.com/AnalyticalGraphicsInc/cesium/tree/master/Documentation/Contributors/BuildGuide

Best,

Hannah

David_Whipps · July 5, 2016, 2:28pm

Thanks Hannah,

I’ll look at adding this to the code and issue a pull request when I’m done.

Dave