| | 109 | == Measure control == |
| | 110 | If you add a measure control to your map (or both of them: length and area), the results are given in the map's projection, I think. So, if you have a different DisplayProjection that will lead to strange results. You will have to transform the event's geometry and call getArea and getLength on the transformed geometry. Then the units may not match the answers (m vs km, for instance), so you need to modify the values yourself (code adapted from the OpenLayers example): |
| | 111 | {{{ |
| | 112 | function handleMeasurements(event) { |
| | 113 | var geometry = event.geometry.transform(new OpenLayers.Projection('EPSG:900913'), new OpenLayers.Projection('EPSG:28993')); |
| | 114 | var units = event.units; |
| | 115 | var order = event.order; |
| | 116 | var element = document.getElementById('measurement'); |
| | 117 | var out = ""; |
| | 118 | // because of the transformation units no longer matches the outcome of getArea and getLength, those are in layer units. |
| | 119 | if(order == 1) { |
| | 120 | if (units=='km'){ |
| | 121 | out += "Distance: " + (geometry.getLength()/1000).toFixed(0) + " km"; |
| | 122 | }else{ |
| | 123 | out += "Distance: " + geometry.getLength().toFixed(0) + " m"; |
| | 124 | } |
| | 125 | } else { |
| | 126 | if (units=='km'){ |
| | 127 | out += "Area: " + (geometry.getArea()/1000000).toFixed(0) + " km<sup>2</sup>"; |
| | 128 | }else{ |
| | 129 | out += "Area: " + geometry.getArea().toFixed(0) + " m<sup>2</sup>"; |
| | 130 | } |
| | 131 | } |
| | 132 | element.innerHTML = out; |
| | 133 | } |
| | 134 | }}} |
| | 135 | |
| | 136 | |
