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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
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* full list of contributors). Published under the 2-clause BSD license.
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* See license.txt in the OpenLayers distribution or repository for the
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* full text of the license. */
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/**
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* @requires OpenLayers/Layer/Vector.js
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*/
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/**
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* Class: OpenLayers.Layer.PointTrack
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* Vector layer to display ordered point features as a line, creating one
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* LineString feature for each pair of two points.
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*
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* Inherits from:
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* - <OpenLayers.Layer.Vector>
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*/
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OpenLayers.Layer.PointTrack = OpenLayers.Class(OpenLayers.Layer.Vector, {
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/**
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* APIProperty: dataFrom
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* {<OpenLayers.Layer.PointTrack.TARGET_NODE>} or
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* {<OpenLayers.Layer.PointTrack.SOURCE_NODE>} optional. If the lines
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* should get the data/attributes from one of the two points it is
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* composed of, which one should it be?
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*/
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dataFrom: null,
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/**
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* APIProperty: styleFrom
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* {<OpenLayers.Layer.PointTrack.TARGET_NODE>} or
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* {<OpenLayers.Layer.PointTrack.SOURCE_NODE>} optional. If the lines
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* should get the style from one of the two points it is composed of,
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* which one should it be?
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*/
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styleFrom: null,
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/**
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* Constructor: OpenLayers.PointTrack
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* Constructor for a new OpenLayers.PointTrack instance.
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*
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* Parameters:
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* name - {String} name of the layer
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* options - {Object} Optional object with properties to tag onto the
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* instance.
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*/
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/**
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* APIMethod: addNodes
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* Adds point features that will be used to create lines from, using point
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* pairs. The first point of a pair will be the source node, the second
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* will be the target node.
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*
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* Parameters:
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* pointFeatures - {Array(<OpenLayers.Feature>)}
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* options - {Object}
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*
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* Supported options:
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* silent - {Boolean} true to suppress (before)feature(s)added events
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*/
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addNodes: function(pointFeatures, options) {
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if (pointFeatures.length < 2) {
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throw new Error("At least two point features have to be added to " +
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"create a line from");
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}
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var lines = new Array(pointFeatures.length-1);
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var pointFeature, startPoint, endPoint;
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for(var i=0, len=pointFeatures.length; i<len; i++) {
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pointFeature = pointFeatures[i];
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endPoint = pointFeature.geometry;
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if (!endPoint) {
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var lonlat = pointFeature.lonlat;
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endPoint = new OpenLayers.Geometry.Point(lonlat.lon, lonlat.lat);
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} else if(endPoint.CLASS_NAME != "OpenLayers.Geometry.Point") {
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throw new TypeError("Only features with point geometries are supported.");
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}
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if(i > 0) {
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var attributes = (this.dataFrom != null) ?
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(pointFeatures[i+this.dataFrom].data ||
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pointFeatures[i+this.dataFrom].attributes) :
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null;
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var style = (this.styleFrom != null) ?
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(pointFeatures[i+this.styleFrom].style) :
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null;
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var line = new OpenLayers.Geometry.LineString([startPoint,
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endPoint]);
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lines[i-1] = new OpenLayers.Feature.Vector(line, attributes,
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style);
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}
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startPoint = endPoint;
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}
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this.addFeatures(lines, options);
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},
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CLASS_NAME: "OpenLayers.Layer.PointTrack"
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});
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/**
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* Constant: OpenLayers.Layer.PointTrack.SOURCE_NODE
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* {Number} value for <OpenLayers.Layer.PointTrack.dataFrom> and
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* <OpenLayers.Layer.PointTrack.styleFrom>
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*/
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OpenLayers.Layer.PointTrack.SOURCE_NODE = -1;
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/**
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* Constant: OpenLayers.Layer.PointTrack.TARGET_NODE
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* {Number} value for <OpenLayers.Layer.PointTrack.dataFrom> and
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* <OpenLayers.Layer.PointTrack.styleFrom>
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*/
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OpenLayers.Layer.PointTrack.TARGET_NODE = 0;
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/**
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* Constant: OpenLayers.Layer.PointTrack.dataFrom
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* {Object} with the following keys - *deprecated*
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* - SOURCE_NODE: take data/attributes from the source node of the line
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* - TARGET_NODE: take data/attributes from the target node of the line
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*/
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OpenLayers.Layer.PointTrack.dataFrom = {'SOURCE_NODE': -1, 'TARGET_NODE': 0};
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