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/* Copyright (c) 2006-2011 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the Clear BSD license.
* See http://svn.openlayers.org/trunk/openlayers/license.txt for the
* full text of the license. */
/**
* @requires OpenLayers/Layer/Vector.js
* @requires OpenLayers/Console.js
*/
/**
* Class: OpenLayers.Layer.PointTrack
* Vector layer to display ordered point features as a line, creating one
* LineString feature for each pair of two points.
*
* Inherits from:
* - <OpenLayers.Layer.Vector>
*/
OpenLayers.Layer.PointTrack = OpenLayers.Class(OpenLayers.Layer.Vector, {
/**
* APIProperty:
* dataFrom - {<OpenLayers.Layer.PointTrack.TARGET_NODE>} or
* {<OpenLayers.Layer.PointTrack.SOURCE_NODE>} optional. If the lines
* should get the data/attributes from one of the two points it is
* composed of, which one should it be?
*/
dataFrom: null,
/**
* APIProperty:
* styleFrom - {<OpenLayers.Layer.PointTrack.TARGET_NODE>} or
* {<OpenLayers.Layer.PointTrack.SOURCE_NODE>} optional. If the lines
* should get the style from one of the two points it is composed of,
* which one should it be?
*/
styleFrom: null,
/**
* Constructor: OpenLayers.PointTrack
* Constructor for a new OpenLayers.PointTrack instance.
*
* Parameters:
* name - {String} name of the layer
* options - {Object} Optional object with properties to tag onto the
* instance.
*/
initialize: function(name, options) {
OpenLayers.Layer.Vector.prototype.initialize.apply(this, arguments);
},
/**
* APIMethod: addNodes
* Adds point features that will be used to create lines from, using point
* pairs. The first point of a pair will be the source node, the second
* will be the target node.
*
* Parameters:
* pointFeatures - {Array(<OpenLayers.Feature>)}
* options - {Object}
*
* Supported options:
* silent - {Boolean} true to suppress (before)feature(s)added events
*/
addNodes: function(pointFeatures, options) {
if (pointFeatures.length < 2) {
OpenLayers.Console.error(
"At least two point features have to be added to create" +
"a line from");
return;
}
var lines = new Array(pointFeatures.length-1);
var pointFeature, startPoint, endPoint;
for(var i=0, len=pointFeatures.length; i<len; i++) {
pointFeature = pointFeatures[i];
endPoint = pointFeature.geometry;
if (!endPoint) {
var lonlat = pointFeature.lonlat;
endPoint = new OpenLayers.Geometry.Point(lonlat.lon, lonlat.lat);
} else if(endPoint.CLASS_NAME != "OpenLayers.Geometry.Point") {
OpenLayers.Console.error(
"Only features with point geometries are supported.");
return;
}
if(i > 0) {
var attributes = (this.dataFrom != null) ?
(pointFeatures[i+this.dataFrom].data ||
pointFeatures[i+this.dataFrom].attributes) :
null;
var style = (this.styleFrom != null) ?
(pointFeatures[i+this.styleFrom].style) :
null;
var line = new OpenLayers.Geometry.LineString([startPoint,
endPoint]);
lines[i-1] = new OpenLayers.Feature.Vector(line, attributes,
style);
}
startPoint = endPoint;
}
this.addFeatures(lines, options);
},
CLASS_NAME: "OpenLayers.Layer.PointTrack"
});
/**
* Constant: OpenLayers.Layer.PointTrack.SOURCE_NODE
* {Number} value for <OpenLayers.Layer.PointTrack.dataFrom> and
* <OpenLayers.Layer.PointTrack.styleFrom>
*/
OpenLayers.Layer.PointTrack.SOURCE_NODE = -1;
/**
* Constant: OpenLayers.Layer.PointTrack.TARGET_NODE
* {Number} value for <OpenLayers.Layer.PointTrack.dataFrom> and
* <OpenLayers.Layer.PointTrack.styleFrom>
*/
OpenLayers.Layer.PointTrack.TARGET_NODE = 0;
/**
* Constant: OpenLayers.Layer.PointTrack.dataFrom
* {Object} with the following keys - *deprecated*
* - SOURCE_NODE: take data/attributes from the source node of the line
* - TARGET_NODE: take data/attributes from the target node of the line
*/
OpenLayers.Layer.PointTrack.dataFrom = {'SOURCE_NODE': -1, 'TARGET_NODE': 0};
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