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/* |
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* this code based on https://openlayers.org/en/latest/examples/custom-interactions.html |
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*/ |
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/** global: ol */ |
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/** global: tmpLayer */ |
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window.app = {}; |
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var app = window.app; |
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app.Drag = function () { |
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ol.interaction.Pointer.call(this, { |
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handleDownEvent: handleDownEvent, |
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handleDragEvent: handleDragEvent, |
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handleMoveEvent: handleMoveEvent, |
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handleUpEvent: handleUpEvent |
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}); |
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this.coordinate_ = null; |
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this.cursor_ = 'pointer'; |
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this.feature_ = null; |
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this.previousCursor_ = undefined; |
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}; |
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ol.inherits(app.Drag, ol.interaction.Pointer); |
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function handleDownEvent(evt) { |
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var map = evt.map; |
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var feature = map.forEachFeatureAtPixel(evt.pixel, |
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basicFeatureHandler, |
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{layerFilter: layerFilter} |
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); |
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if (feature) { |
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this.coordinate_ = evt.coordinate; |
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this.feature_ = feature; |
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} |
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return !!feature; |
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} |
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function handleDragEvent(evt) { |
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var map = evt.map; |
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var feature = map.forEachFeatureAtPixel(evt.pixel, |
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basicFeatureHandler, |
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{layerFilter: layerFilter}); |
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var deltaX = evt.coordinate[0] - this.coordinate_[0]; |
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var deltaY = evt.coordinate[1] - this.coordinate_[1]; |
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var geometry = /** @type {ol.geom.SimpleGeometry} */ |
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(this.feature_.getGeometry()); |
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geometry.translate(deltaX, deltaY); |
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this.coordinate_[0] = evt.coordinate[0]; |
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this.coordinate_[1] = evt.coordinate[1]; |
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} |
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function handleMoveEvent(evt) { |
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if (this.cursor_) { |
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var map = evt.map; |
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var feature = map.forEachFeatureAtPixel(evt.pixel, |
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basicFeatureHandler, |
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{layerFilter: layerFilter}); |
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var element = evt.map.getTargetElement(); |
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if (feature) { |
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if (element.style.cursor != this.cursor_) { |
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this.previousCursor_ = element.style.cursor; |
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element.style.cursor = this.cursor_; |
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} |
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} else if (this.previousCursor_ !== undefined) { |
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element.style.cursor = this.previousCursor_; |
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this.previousCursor_ = undefined; |
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} |
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} |
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} |
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function handleUpEvent(evt) { |
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setTmpPointer(evt.coordinate); |
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this.coordinate_ = null; |
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this.feature_ = null; |
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return false; |
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} |
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function layerFilter(layer) { |
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if (layer === tmpLayer) { |
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return(true); |
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} |
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return(false); |
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} |
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function basicFeatureHandler(feature, layer) { |
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return(feature); |
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} |
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GEANT /
CAT
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