phillip/ingress-intel-total-conversion
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some refactoring of the zoom level handling. will make it easy and relatively friendly on the servers to boost the map detail level for given zoom levels

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This commit is contained in:
Jon Atkins 2013-06-15 17:07:56 +01:00
parent 985bf78e47
commit 993c830bf0
1 changed files with 19 additions and 5 deletions
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24
code/utils_misc.js
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@ -245,18 +245,27 @@ window.renderLimitReached = function(ratio) {
}
window.getPortalDataZoom = function() {
var z = map.getZoom();
var mapZoom = map.getZoom();
// modify here if we want to force portal detail level zoom above the map zoom. this can increase the
// requests to the niantic servers so isn't done by default
var z = mapZoom;
// limiting the mazimum zoom level for data retrieval reduces the number of requests at high zoom levels
// (as all portal data is retrieved at z=17, why retrieve multiple z=18 tiles when fewer z=17 would do?)
// a potential downside - we end up requesting more data than we needed from the larger tiles that go off
// the window edge.
// very effective along with the new cache code
if (z > 17) z=17;
// we could consider similar zoom-level consolidation, as, e.g. level 16 and 15 both return L1+, always
// request zoom 15 tiles. however, there are quirks in the current data stream, where small fields aren't
// returned by the server. using larger tiles always would amplify this issue.
// (this is not triggered by default, as both z and mapZoom are the same)
// if the data zoom is above the map zoom we can step back if the detail level is the same
// with the new cache code this works rather well
while (z > mapZoom && getMinPortalLevelForZoom(z) == getMinPortalLevelForZoom(z-1)) {
z = z-1;
}
//sanity check - should never happen
if (z < 0) z=0;
@ -264,8 +273,7 @@ window.getPortalDataZoom = function() {
return z;
}
window.getMinPortalLevel = function() {
var z = getPortalDataZoom();
window.getMinPortalLevelForZoom = function(z) {
if(z >= 17) return 0;
if(z < 0) return 8;
var conv = [8,8,8,8,7,7,6,6,5,4,4,3,3,2,2,1,1];
@ -276,6 +284,12 @@ window.getMinPortalLevel = function() {
return result;
}
window.getMinPortalLevel = function() {
var z = getPortalDataZoom();
return getMinPortalLevelForZoom(z);
}
// returns number of pixels left to scroll down before reaching the
// bottom. Works similar to the native scrollTop function.
window.scrollBottom = function(elm) {