Method limitScale

src/openlayers/mapping/WebMap.js:776–822

(mapInfo, baseLayer)

  }

  limitScale(mapInfo, baseLayer) {
    if (this.validScale(mapInfo.minScale) && this.validScale(mapInfo.maxScale)) {
      let visibleScales, minScale, maxScale;
      if (baseLayer.layerType === 'WMTS') {
        visibleScales = baseLayer.scales;
        minScale = +mapInfo.minScale.split(':')[1];
        maxScale = +mapInfo.maxScale.split(':')[1];
      } else {
        const scales = this.scales.map((scale) => {
          return 1 / scale.split(':')[1];
        });
        if (Array.isArray(baseLayer.visibleScales) && baseLayer.visibleScales.length && baseLayer.visibleScales) {
          visibleScales = baseLayer.visibleScales;
        } else {
          visibleScales = scales;
        }
        minScale = 1 / +mapInfo.minScale.split(':')[1];
        maxScale = 1 / +mapInfo.maxScale.split(':')[1];
      }
      const minVisibleScale = this.findNearest(visibleScales, minScale);
      const maxVisibleScale = this.findNearest(visibleScales, maxScale);
      let minZoom = visibleScales.indexOf(minVisibleScale);
      let maxZoom = visibleScales.indexOf(maxVisibleScale);
      if (minZoom > maxZoom) {
        [minZoom, maxZoom] = [maxZoom, minZoom];
      }
      if (minZoom !== 0 || maxZoom !== visibleScales.length - 1) {
        const oldViewOptions = this.map.getView().options_ || this.map.getView().getProperties();
        this.map.setView(
          new View(
            Object.assign({}, oldViewOptions, {
              maxResolution: undefined,
              minResolution: undefined,
              minZoom,
              maxZoom,
              constrainResolution: false
            })
          )
        );
        this.map.addInteraction(
          new MouseWheelZoom({
            constrainResolution: true
          })
        );
      }
    }
  }

  parseNumber(scaleStr) {
    return Number(scaleStr.split(':')[1]);