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Magnifier ADDON

This addon allows users to zoom in a specific area of the map, either using the current map layers ("dynamic" mode), or a static layer ("static" mode). authors: @fvanderbiest, @spelhate

For a static magnifier, you may want to configure your addon with a custom baselayer. In this case, the addon config should look like this:

{
    "id": "magnifier_zoom",
    "name": "Magnifier",
    "title": {
        "en": "Aerial imagery magnifier",
        "es": "Lupa ortofoto",
        "fr": "Loupe orthophoto",
        "de": "Orthophoto Lupe"
    },
    "description": {
        "en": "A tool which allows to zoom in an aerial image on a map portion",
        "es": "Una herramienta que te permite hacer un zoom sobre una parte del mapa ortofoto",
        "fr": "Un outil qui permet de zoomer dans une orthophoto sur une portion de la carte",
        "de": "Werkzeug erlaubt Zoom mittels Orthophoto auf Kartenbereich"
    },
    "options": {
        "baseLayerConfig": {
            "wmsurl": "http://myserver.com/gwc/service/wms"
            "layer": "mylayer",
            "format": "image/jpeg",
            "buffer": 8
        }
    }
}

For a dynamic magnifier (which means that the magnifier will zoom into the current visible layers), the addon config should rather be:

{
    "id": "magnifier_zoom",
    "name": "Magnifier",
    "title": {
        "en": "Aerial imagery magnifier",
        "es": "Lupa ortofoto",
        "fr": "Loupe orthophoto",
        "de": "Orthophoto Lupe"
    },
    "description": {
        "en": "A tool which allows to zoom in an aerial image on a map portion",
        "es": "Una herramienta que te permite hacer un zoom sobre una parte del mapa ortofoto",
        "fr": "Un outil qui permet de zoomer dans une orthophoto sur une portion de la carte",
        "de": "Werkzeug erlaubt Zoom mittels Orthophoto auf Kartenbereich"
    },
    "options": {
        "mode": "dynamic",
        "delta": 1,
        "baseLayerConfig": {
            "buffer": 8
        }
    }
}

Default options for this addon are specified in the manifest.json file:

"default_options": {
    "mode": "static",
    "baseLayerConfig": {
        "wmsurl": "http://tile.geobretagne.fr/gwc02/service/wms",
        "layer": "satellite",
        "format": "image/jpeg",
        "buffer": 8
    }
}

This means that the magnifier tool will display the layer "satellite" from the http://tile.geobretagne.fr/gwc02/service/wms WMS server.

Note: the original OpenLayers magnifier control comes from https://github.com/fredj/openlayers-magnifier