Method _zoomIn

modules/core/MapSystem.js:809–809

(delta)

  // convenience methods for zooming in and out
  _zoomIn(delta)  { return this.setMapParams(undefined, ~~this.zoom() + delta, undefined, 250); }
  _zoomOut(delta) { return this.setMapParams(undefined, ~~this.zoom() - delta, undefined, 250); }

  zoomIn()        { return this._zoomIn(1); }