91 lines
2.4 KiB
Markdown
91 lines
2.4 KiB
Markdown
---
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layout: tutorial_frame
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title: Grid coordinates
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---
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<style>
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#info {
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position:absolute;
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top:0;
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right:0;
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width: 20em;
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height: 7.5em;
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background: rgba(255,255,255,.5);
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z-index:500;
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font: 12px Sans;
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}
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.crsMarker {
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border-top: 2px green solid;
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border-left: 2px green solid;
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}
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</style>
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<div id='info' style=''></div>
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<script type='text/javascript'>
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var trd = [63.41, 10.41];
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var map = L.map('map', {
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center: [40, 0],
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zoom: 1
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});
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var positron = L.tileLayer('http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png', {
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attribution: "CartoDB"
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}).addTo(map);
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var marker = L.marker(trd).addTo(map);
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var pane = map.getPane('markerPane')
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var paneCorner = document.createElement('div');
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paneCorner.style.width = '12px';
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paneCorner.style.height = '12px';
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paneCorner.style.borderTop = '2px red solid';
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paneCorner.style.borderLeft = '2px red solid';
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pane.appendChild(paneCorner);
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marker._icon.style.border = '1px solid blue';
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var crsMarker = L.marker( map.unproject([0, 0]), {
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icon: L.divIcon({
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className: 'crsMarker',
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iconAnchor: [0, 0]
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})
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} ).addTo(map);
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var markerOffsetLine = L.polyline([[0, 0], [0, 0]], {color: 'skyblue'}).addTo(map);
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var iconOffsetLine = L.polyline([[0, 0], [0, 0]], {color: 'blue'}).addTo(map);
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function info() {
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var pixelOrigin = map.getPixelOrigin();
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var markerPixelCoords = map.project(trd, map.getZoom());
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var markerAnchor = marker.options.icon.options.iconAnchor;
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var markerOffset = marker._icon._leaflet_pos;
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document.getElementById('info').innerHTML =
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'<div style="color: green">CRS origin: 0,0</div>' +
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'<div style="color: red">px origin: Δ' + pixelOrigin.x + ',' + pixelOrigin.y + '</div>' +
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'<div style="color: blue">marker px coords:' + markerPixelCoords.x.toFixed(2) + ',' + markerPixelCoords.y.toFixed(2) + '</div>' +
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'<div style="color: blue">marker anchor: Δ' + markerAnchor[0] + ',' + markerAnchor[1] + '</div>' +
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'<div style="color: skyblue">marker pane offset: Δ' + markerOffset.x + ',' + markerOffset.y + '</div>';
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markerOffsetLine.setLatLngs([ map.unproject(pixelOrigin), map.unproject(pixelOrigin.add(markerOffset))]);
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iconOffsetLine.setLatLngs([ map.unproject(pixelOrigin.add(markerOffset)), map.unproject(pixelOrigin.add(markerOffset).subtract(markerAnchor))]);
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}
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map.on('load move moveend zoomend viewreset', info)
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info();
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</script>
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