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/**
 * MODIFICATION À MarkerManager.prototype.resetManager_ PAR FRÉDÉRICK DUBOIS
 * MÊME FONCTIONNEMENT MAIS LIMITÉ ENTRE 2 NIVEAUX DE ZOOM POUR EFFACER SEULEMENT CERTAINS MARKERS
 */ 
MarkerManager.prototype.DuProprio_clearMarkersOnLayer = function(intLimitZoomOut, intLimitZoomIn) {
  var me = this;
  me.processAll_(me.shownBounds_, me.removeOverlay_);
  me.DuProprio_resetManagerLayer_(intLimitZoomOut, intLimitZoomIn);
};
MarkerManager.prototype.DuProprio_resetManagerLayer_ = function(intLimitZoomOut, intLimitZoomIn) {
  var me = this;
  var mapWidth = MarkerManager.MERCATOR_ZOOM_LEVEL_ZERO_RANGE;
  for (var zoom = intLimitZoomOut; zoom <= intLimitZoomIn; ++zoom) {
    me.grid_[zoom] = [];
  	me.numMarkers_[zoom] = 0;
    //me.gridWidth_[zoom] = Math.ceil(mapWidth/me.tileSize_);
    mapWidth <<= 1;
  }
};